Campbell Scientific PVS5120-Series Portable Samplers Instruction manual

INSTRUCTION MANUAL
PVS5120-Series
Portable Samplers
Revision: 9/15
C o p y r i g h t © 2 0 1 1 - 2 0 1 5
C a m p b e l l S c i e n t i f i c , I n c .
Limited Warranty
The PVS5120-Series Portable Samplers are warranted for thirty-six (36)
months subject to this limited warranty:
“Products manufactured by CSI are warranted by CSI to be free from defects in
materials and workmanship under normal use and service for twelve months
from the date of shipment unless otherwise specified in the corresponding
product manual. (Product manuals are available for review online at
www.campbellsci.com.) Products not manufactured by CSI, but that are resold
by CSI, are warranted only to the limits extended by the original manufacturer.
Batteries, fine-wire thermocouples, desiccant, and other consumables have no
warranty. CSI’s obligation under this warranty is limited to repairing or
replacing (at CSI’s option) defective Products, which shall be the sole and
exclusive remedy under this warranty. The Customer assumes all costs of
removing, reinstalling, and shipping defective Products to CSI. CSI will return
such Products by surface carrier prepaid within the continental United States of
America. To all other locations, CSI will return such Products best way CIP
(port of entry) per Incoterms ® 2010. This warranty shall not apply to any
Products which have been subjected to modification, misuse, neglect, improper
service, accidents of nature, or shipping damage. This warranty is in lieu of all
other warranties, expressed or implied. The warranty for installation services
performed by CSI such as programming to customer specifications, electrical
connections to Products manufactured by CSI, and Product specific training, is
part of CSI's product warranty. CSI EXPRESSLY DISCLAIMS AND
EXCLUDES ANY IMPLIED WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. CSI hereby disclaims,
to the fullest extent allowed by applicable law, any and all warranties and
conditions with respect to the Products, whether express, implied or
statutory, other than those expressly provided herein.”
Assistance
Products may not be returned without prior authorization. The following
contact information is for US and international customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company serves
your country.
To obtain a Returned Materials Authorization (RMA), contact CAMPBELL
SCIENTIFIC, INC., phone (435) 227-9000. After an application engineer
determines the nature of the problem, an RMA number will be issued. Please
write this number clearly on the outside of the shipping container. Campbell
Scientific’s shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
For all returns, the customer must fill out a “Statement of Product Cleanliness
and Decontamination” form and comply with the requirements specified in it.
The form is available from our web site at www.campbellsci.com/repair. A
completed form must be either emailed to [email protected] or faxed to
(435) 227-9106. Campbell Scientific is unable to process any returns until we
receive this form. If the form is not received within three days of product
receipt or is incomplete, the product will be returned to the customer at the
customer’s expense. Campbell Scientific reserves the right to refuse service on
products that were exposed to contaminants that may cause health or safety
concerns for our employees.
Safety
DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND
TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES,
ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS,
TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS
INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS.
CHECK WITH YOUR ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE
EQUIPMENT PRIOR TO PERFORMING ANY WORK.
Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not exceed design
limits. Be familiar and comply with all instructions provided in product manuals. Manuals are available at www.campbellsci.com or
by telephoning (435) 227-9000 (USA). You are responsible for conformance with governing codes and regulations, including safety
regulations, and the integrity and location of structures or land to which towers, tripods, and any attachments are attached. Installation
sites should be evaluated and approved by a qualified engineer. If questions or concerns arise regarding installation, use, or
maintenance of tripods, towers, attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.
General
• Prior to performing site or installation work, obtain required approvals and permits. Comply
with all governing structure-height regulations, such as those of the FAA in the USA.
• Use only qualified personnel for installation, use, and maintenance of tripods and towers, and
any attachments to tripods and towers. The use of licensed and qualified contractors is highly
recommended.
• Read all applicable instructions carefully and understand procedures thoroughly before
beginning work.
• Wear a hardhat and eye protection, and take other appropriate safety precautions while
working on or around tripods and towers.
• Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take
reasonable precautions to secure tripod and tower sites from trespassers.
• Use only manufacturer recommended parts, materials, and tools.
Utility and Electrical
• You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are
installing, constructing, using, or maintaining, or a tool, stake, or anchor, come in contact with
overhead or underground utility lines.
• Maintain a distance of at least one-and-one-half times structure height, 20 feet, or the distance
required by applicable law, whichever is greater, between overhead utility lines and the
structure (tripod, tower, attachments, or tools).
• Prior to performing site or installation work, inform all utility companies and have all
underground utilities marked.
• Comply with all electrical codes. Electrical equipment and related grounding devices should
be installed by a licensed and qualified electrician.
Elevated Work and Weather
• Exercise extreme caution when performing elevated work.
• Use appropriate equipment and safety practices.
• During installation and maintenance, keep tower and tripod sites clear of un-trained or nonessential personnel. Take precautions to prevent elevated tools and objects from dropping.
• Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.
Maintenance
• Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks,
frayed cables, loose cable clamps, cable tightness, etc. and take necessary corrective actions.
• Periodically (at least yearly) check electrical ground connections.
WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS,
THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR
MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS,
ENCLOSURES, ANTENNAS, ETC.
Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. Introduction ................................................................. 1
2. Precautions ................................................................. 1
3. Initial Inspection ......................................................... 2
4. Overview ...................................................................... 2
4.1
Component Overview .......................................................................... 3
4.1.1.1 Manual Control Button....................................................... 4
4.2
Composite and Discrete Overview....................................................... 5
4.2.1 Discrete Sampling ......................................................................... 5
4.2.2 Composite Sampling ..................................................................... 5
5. Specifications ............................................................. 6
5.1
5.2
5.3
General Specifications ......................................................................... 6
VSC100 Controller .............................................................................. 7
Vacuum Pump System ......................................................................... 8
6. Device Configuration Utility Overview ...................... 9
6.1
Connecting to the VSC100/Sampler via DevConfig ............................ 9
6.1.1 Clock Tab.................................................................................... 10
6.2
Settings Editor Tab............................................................................. 11
6.2.1 Info Tab ...................................................................................... 11
6.2.2 Sampler Settings Tab .................................................................. 12
6.2.3 Advanced Sampler Settings Tab ................................................. 13
6.2.4 Pulse Settings Tab ....................................................................... 15
6.2.5 Time Settings Tab ....................................................................... 15
6.2.6 Terminal Tab............................................................................... 16
7. Installation ................................................................. 17
7.1
Field Installation ................................................................................ 17
7.1.1 Required Gear for Field Deployment .......................................... 17
7.1.2 Sampler Positioning .................................................................... 17
7.1.3 Steps for Field Deployment ........................................................ 18
7.2
Sampler Components ......................................................................... 20
7.2.1 Sample Volume Adjustment ....................................................... 20
7.2.2 Liquid Sensing/Conductivity Rod ............................................... 21
7.2.3 Cables ......................................................................................... 21
7.2.3.1 PVS5120CBL-L Control Cable (pn 30432) ..................... 21
7.2.3.1.1 Wiring.................................................................... 21
7.2.3.2 USB Cable (pn 17648) ..................................................... 22
7.2.3.3 External Battery Cable (pn 30819) ................................... 22
7.2.4 Battery......................................................................................... 23
7.2.4.1 Internal verses External Battery Options .......................... 23
i
Table of Contents
7.2.4.2 VSC100 Battery............................................................... 23
7.2.4.3 Fuses ................................................................................ 23
7.3
Optional Components ........................................................................ 24
7.3.1 Water Detection Probe ............................................................... 24
7.3.2 Sinker / Strainer.......................................................................... 24
7.3.3 Wall Chargers ............................................................................ 25
7.4
Fault-Wiring Directions .................................................................... 25
7.5
Installation Checklist ......................................................................... 26
8. Operation ...................................................................26
8.1
8.2
Operating Sequence........................................................................... 26
Deployment Procedures for Each Control Type................................ 28
8.2.1 Connecting to the VSC100/Sampler via DevConfig .................. 29
8.2.2 Time-Based Control ................................................................... 30
8.2.3 SDI-12 Control ........................................................................... 32
8.2.3.1 Wiring for SDI-12 Control .............................................. 34
8.2.3.2 SDI-12 Programming ...................................................... 34
8.2.4 PakBus® Control ....................................................................... 36
8.2.4.1 Configuring the MD485 .................................................. 36
8.2.4.2 Configuring Sampler for PakBus® Control .................... 38
8.2.4.3 Wiring for PakBus® Control ........................................... 40
8.2.4.4 Programming for PakBus® Control ................................ 40
8.2.4.5 PakBus® Example Instructions ....................................... 43
8.2.5 Modbus® Control ...................................................................... 43
8.2.5.1 Configuring the MD485 .................................................. 43
8.2.5.2 Configuring Sampler for Modbus® Control.................... 45
8.2.5.3 Wiring for Modbus® Control .......................................... 47
8.2.5.4 Programming for Modbus® Control with Campbell
Scientific Datalogger ................................................... 47
8.2.5.5 Modbus® Example Instructions ...................................... 50
8.2.6 Pulse Control .............................................................................. 50
8.2.6.1 Wiring for Pulse Control ................................................. 53
9. Maintenance and Troubleshooting ..........................53
9.1
Maintenance ...................................................................................... 53
9.1.1 Meter Chamber Assembly .......................................................... 53
9.1.2 Internal Battery (when included)................................................ 54
9.1.3 Intake Hose ................................................................................ 54
9.1.4 Testing System Vacuum ............................................................ 54
9.1.5 VSC100 Maintenance ................................................................ 55
9.2
Troubleshooting ................................................................................ 55
9.2.1 Common Troubleshooting Scenarios ......................................... 55
9.2.2 Information Needed for Help in Troubleshooting a Problem ..... 56
9.3
Storage............................................................................................... 56
Appendices
A. Sample Transport Velocity ..................................... A-1
B. Example Programs.................................................. B-1
B.1
SDI-12 Example Programs .............................................................. B-1
B.1.1 CR1000 SDI-12 Programs ....................................................... B-1
ii
Table of Contents
B.1.1.1
B.1.1.2
CR1000 Program Controlling One Sampler ................... B-1
CR1000 Program for Running Three Samplers
Concurrently ............................................................... B-2
B.1.2 CR200X Series Programs ......................................................... B-3
B.2
PakBus® Example Programs ........................................................... B-4
B.2.1 PakBus® Control CR1000 Program ......................................... B-4
B.3
Modbus® Example Programs .......................................................... B-6
B.3.1 CR1000 Modbus® Control Program ........................................ B-6
C. Monitoring Sampler Status via RS-485 ................. C-1
C.1
C.2
C.3
Configuring an MD485 .................................................................... C-1
Wiring for Status Monitoring via RS-485 ........................................ C-3
Configure the VSC100 ..................................................................... C-3
C.3.1 Connecting to the VSC100/Sampler via DevConfig ................. C-3
C.4
Programming for RS-485 Monitoring .............................................. C-5
C.4.1 Monitoring via PakBus® .......................................................... C-5
C.4.1.1 CR1000 Program for PakBus® Monitoring with
Time-Based Configuration ......................................... C-5
C.4.2 Monitoring via Modbus® ......................................................... C-6
C.4.2.1 Modbus® Monitoring with Time-Based
Configuration .............................................................. C-7
D. Replacement Parts.................................................. D-1
E. Lithium Battery Replacement ................................ E-1
F. Response Code 4 Scenarios.................................. F-1
G. Generic Modbus® Control ..................................... G-1
H. ISO5667 Conformity................................................ H-1
Figures
4-1.
4-2.
4-3.
4-4.
6-1.
6-2.
6-3.
6-4.
6-5.
6-6.
6-7.
6-8.
7-1.
7-2.
7-3.
7-4.
7-5.
7-6.
7-7.
PVS5120D Sampler ............................................................................. 3
Control Panel ....................................................................................... 4
Manual Control Button ........................................................................ 4
PVS5120C Composite Sampler ........................................................... 6
VSC100 and 17648 USB cable ............................................................ 9
Device Configuration VSC100 .......................................................... 10
Clock tab ............................................................................................ 10
Info tab ............................................................................................... 11
Sampler Settings tab........................................................................... 12
Advanced Sampler Settings tab ......................................................... 14
Pulse Settings tab ............................................................................... 15
Time Settings tab ............................................................................... 16
Sampler installation............................................................................ 17
Conductivity rod and intake hose connection .................................... 18
Control panel...................................................................................... 19
Metering chamber and volume control tube....................................... 20
PVS5120CBL-L Control Cable (pn 30432) ....................................... 21
USB Cable (pn 17648) ....................................................................... 22
External Battery Cable (pn 30819)..................................................... 23
iii
Table of Contents
7-8.
7-9.
7-10.
8-1.
8-2.
8-3.
8-4.
8-5.
8-6.
8-7.
8-8.
8-9.
8-10.
8-11.
8-12.
8-13.
8-14.
8-15.
8-16.
8-17.
8-18.
C-1.
C-2.
C-3.
C-4.
30144-L Water Detection Probe........................................................ 24
Lead sinker attached to the intake hose (left) and the sinker/
strainer ........................................................................................... 25
110 Vac Charger (pn 27825) ............................................................. 25
Diagram of operating sequence ......................................................... 26
Purge time as a function of hose length............................................. 27
VSC100 and 17648 USB cable ......................................................... 28
Device Configuration VSC100 ......................................................... 29
Time-Based Sampler Settings screen ................................................ 31
SDI-12 Sampler Settings screen ........................................................ 33
MD485 Device Configuration screen ................................................ 37
MD485 Deployment tab .................................................................... 37
MD485 CS I/O tab ............................................................................ 38
MD485 RS-485 tab ........................................................................... 38
PakBus® Setting Editor screen ......................................................... 39
MD485 Device Configuration screen ................................................ 44
MD485 Deployment tab .................................................................... 44
MD485 CS I/O tab ............................................................................ 45
MD485 RS-485 tab ........................................................................... 45
Modbus® Setting Editor screen ........................................................ 46
Pulse Control settings ........................................................................ 51
Pulse Settings tab .............................................................................. 52
MD485 Device Configuration screen .............................................. C-1
MD485 Deployment tab .................................................................. C-2
MD485 RS-485 tab ......................................................................... C-2
Device Configuration VSC100 ....................................................... C-4
4-1.
7-1.
7-2.
8-1.
8-2.
8-3.
8-4.
8-5.
8-6.
8-7.
8-8.
8-9.
A-1.
A-2.
C-1.
D-1.
F-1.
G-1.
G-2.
Control Panel Descriptions .................................................................. 4
PVS5120CBL-L Cable Connections ................................................. 22
Fuse Part Numbers ............................................................................ 24
Default Settings ................................................................................. 28
SDI-12 Wiring (PVS5120CBL-L Cable) .......................................... 34
Numeric Response Codes of the VSC100 ......................................... 35
PakBus® Control Connections (PVS5120CBL-L Cable) ................. 40
VSC100 Public Table for PakBus® Control ..................................... 42
Modbus® Control Connections (PVS5120CBL-L Cable) ................ 47
Generic Modbus® Control and Monitoring of the Sampler .............. 48
Modbus® Function Codes................................................................. 49
Pulse Control Wiring (PVS5120CBL-L Cable) ................................ 53
Vertical Velocity at Sea Level......................................................... A-1
Horizontal Lift ................................................................................. A-1
Status Monitoring Connections (PVS5120CBL-L Cable)............... C-3
Replacement Parts ........................................................................... D-1
Status Value ..................................................................................... F-1
Detailed Modbus® Control Information ......................................... G-1
Simplified Modbus® Control .......................................................... G-2
Tables
iv
PVS5120-Series Portable Samplers
1.
Introduction
The PVS5120-series samplers are automatic liquid samplers for water and
wastewater applications. These samplers gather fluid automatically from a
variety of sources including containers, open channels, sewers, pipes, and any
open source of water. They are lightweight, portable, battery-powered water
samplers designed for reliable unattended sample collection.
The PVS5120-series portable samplers use the VSC100 controller that allows a
Modbus® RTU master, SDI-12 master device, simple pulse input, or Campbell
Scientific PakBus® datalogger to control and communicate with the water
sampler. The PVS5120 can also run in a time-controlled, stand-alone mode.
The PVS5120C is a composite sampler that deposits its water samples into one
9 L container; the PVS5120D is a discrete sampler that deposits its water
samples into 1 to 24 containers.
2.
Precautions
•
READ AND UNDERSTAND the Safety section at the front of this
manual.
•
CAUTION: Damage resulting from running the sampler under freezing
conditions will not be covered under the product warranty.
•
Wiring to remote/external sensors should avoid all ac power lines if
possible and/or be run in shielded cable terminating the shield at the ac
ground terminal at the remote site.
•
The intake hose should be 7.6 m (25 ft) or longer. Shorter hoses do not
provide sufficient back pressure to the metering chamber, allowing the
pump to efficiently expel all solids into the sample container.
•
The liquid sensing rod and the volume control tube must be kept clean to
ensure the conductivity necessary to detect the presence of the fluid.
•
CAUTION: Do not program the sampler using the generic SDI-12 sensor
option in Campbell Scientific’s Short Cut. The wiring diagram generated
by Short Cut is incorrect for connecting the PVS5120 to a datalogger. It
shows a power wire (12 V) connection that is not necessary for running the
sampler as an SDI-12 sensor. Connecting the control cable’s red wire to
the datalogger’s 12 V terminal causes problems in the sampler. See
Section 8.2.3, SDI-12 Control (p. 32), for more information.
1
PVS5120-Series Portable Samplers
3.
4.
Initial Inspection
•
Upon receipt of the sampler, inspect the packaging and contents for
damage. File damage claims with the shipping company.
•
Immediately check package contents against the shipping documentation.
Contact Campbell Scientific about any discrepancies.
Overview
The PVS5120-series can have a standard or a large pump. At sea level, the
standard pump takes samples at 1.6 m/s (5.1 ft/s) for horizontal draws of 7.6 m
(25 ft), and the large pump takes samples at 2.2 m/s (7.1 ft/s) at 7.6 m (25 ft).
When sampling is initiated, liquid travels through the intake hose to the volume
control tube into the metering chamber. The amount of water taken is set
mechanically using the liquid sensing rod and the volume control tube, which
means sample accuracy is precise every time, usually within ±2% or ±2 ml.
Sample accuracy increases when you have set the volume control rod and
tested the collected sample at setup. Once the pre-set amount has been
reached, all excess liquid is purged from the system, and the sample is dropped
into a container.
2
PVS5120-Series Portable Samplers
4.1
Component Overview
FIGURE 4-1 shows the sampler’s components. FIGURE 4-2 and TABLE 4-1
describe the control panel.
Nuts to Adjust Volume
Volume
Control Tube
Intake Hose Connection
Handle
Enclosure
Wiring
Liquid Sensing/
Conductivity Rod
Float Valve Barrier
Fuse
Metering
Chamber
Sample Bottles
Battery
Retaining Plate
VSC100
Controller
T-Bar
Control
Section
Control
Panel
Folding Handle
500 mL Base
Clasps
1 L Base
(optional)
Intake Hose
Sinker
(optional strainer)
FIGURE 4-1. PVS5120D Sampler
3
PVS5120-Series Portable Samplers
FIGURE 4-2. Control Panel
TABLE 4-1. Control Panel Descriptions
Label
Fault
Description
Red LED flashes to indicate fault errors
Power (LED)
After the power is turned on, this green LED should
light up for several seconds and start blinking once
per second.
Signals (connector)
Connector for the external control cable that attaches
the sampler to a datalogger, MD485, or other
external device that controls or monitors the
sampler.
Power (connector)
Connector for attaching a 12 Vdc charger or external
battery.
5A/250V/AGC
or
10A/32V/MDL
Fuse that protects the control panel. Varies
depending on pump choice. The 10 A version is for
the large pump.
Manual Control
Blue button used to Service, Manually Sample, and
Auto Deploy the sampler (see Section 4.1.1.1,
Manual Control Button (p. 4), for more information).
INT BATTERY ON
Off
EXT BATTERY ON
Three way toggle switch used to select whether the
sampler is running off of the internal or external
battery or turns the power off.
4.1.1.1 Manual Control Button
The blue Manual Control button is located at the top right of the control panel.
This button allows the user to Service the sampler, collect a Manual Sample, or
run the Auto Deploy routine. A label on top of the sampler shows the button’s
function (FIGURE 4-3).
FIGURE 4-3. Manual Control Button
4
PVS5120-Series Portable Samplers
1.
Service the sampler: Push the button once and release. Servicing the
sampler tells the controller to zero all the sample counts and return to the
first bottle or home position. It assumes the user has emptied or replaced
the bottles. The next sample collected and logged by the datalogger is
bottle 1, sample number 1.
2.
Manual Sample collection: Push the button twice and release. This
directs the sampler to collect a manual sample into whichever bottle the
sampler is currently on independent of the datalogger. This sample is
logged by the controller. The next time the datalogger tells the sampler to
collect a sample, the count increments by two.
For example, if the sampler is collecting only one sampler per bottle and it
is on bottle two, the manual sample drops in bottle 2 and the arm moves to
bottle 3. The next time the datalogger initiates a sample, the sampler
deposits it into bottle 3. The controller then returns to the datalogger the
following status values: bottle 3, sample 1, response code 0, and the
sampler battery voltage.
3.
4.2
Auto Deploy routine: Push and hold the button until the sampler begins
running and then release the button. The Auto Deploy routine runs the
sampler through an entire sampling sequence while keeping track of the
time to move water from the water source to the metering chamber. It uses
this information to set the purge and the vacuum times within the
controller. The user can see these times and keep them or change them by
connecting to the VSC100 with our Device Configuration Utility
(DevConfig).
Composite and Discrete Overview
4.2.1 Discrete Sampling
The PVS5120D is a discrete system that places samples into more than one
container. It has a stepper assembly that moves a distributor arm. The
distributor arm revolves 360° and can deliver samples into 24 separate
containers. An encoder senses the distributor arm position. The PVS5120D
samplers can have 500 mL or 1 L bottles (FIGURE 4-1). Available bottle
configurations are 1, 2, 3, 4, 6, 8, 12, and 24.
Discrete sampling is beneficial in situations where change over time needs to
be measured, such as measuring different water characteristics over 24 hours.
Labs and monitoring personnel tend to rely on discrete sampling.
4.2.2 Composite Sampling
The PVS5120C composite sampler draws water samples into one 9 L container
(FIGURE 4-4). Composite sampling is the simplest method for taking samples
and is often used when the sampler is measuring effluent in one location. The
composite sampler is also less expensive than the discrete model.
5
PVS5120-Series Portable Samplers
FIGURE 4-4. PVS5120C Composite Sampler
5.
Specifications
Features:
• Diagnostic feedback provided to the master device: bottle number,
sample number, response code/message, sampler battery voltage
• Auto Deploy routine that automatically sets the purge and the vacuum
times based on hose length
• Repeatable volume collection via metering chamber
• Selectable internal or external power via three-way power switch
• One control cable for all control types
• An optional water present sensor detects the presence of water at the
mouth of the sampler intake hose to ensure a sample is available
• Compatible with Campbell Scientific CRBasic dataloggers:
CR200(X)-series, CR6, CR800-series, CR1000, CR3000, and
CR5000
5.1
6
General Specifications
Enclosure:
LLDPE, linear low-density polyethylene,
three piece construction and stainless steel
fittings
Cooling system:
Insulated container wall cavity. Space for
ice.
Height:
80.9 cm (31.875 in)
Height with extended base:
96.2 cm (37.875 in)
Body case diameter:
42.8 cm (16.85 in)
PVS5120-Series Portable Samplers
Weight
Sampler w/standard
pump and no battery:
Sample w/large pump
and no battery:
7 Ah battery:
17 Ah battery:
10.4 kg (23 lb)
11.8 kg (26 (lb)
1.8 kg (4 lb)
6.3 kg (14 lb)
Temperature range
Storage:
–20 to 50 °C
Operating (large pump):
0 to 40 °C
Operating (standard pump): 0 to 50 °C
CAUTION
Damage resulting from running the sampler under freezing
conditions will not be covered under the product warranty.
Storage:
Power requirements
Input power:
Internal battery:
External charger:
Compliance:
5.2
–40 to 60 °C (–40 to 140 °F)
12 Vdc
7 Ah or 17 Ah
110 Vac charger or 100 to 240 Vac
charger
CE Compliant
RoHS Compliant
Complies with the relevant sections of the
ISO 5667-10 standard applicable to
unrefrigerated portable water samplers
(Appendix H)
VSC100 Controller
Sampler triggering methods:
SDI-12 Master Device, Modbus® RTU
Master, Campbell Scientific PakBus®
datalogger, pulse trigger (1 to 10,000
pulses), time-based sampling (stand-alone)
RS-485 communication:
Can return sampler status when triggering
samples via pulse or time-based control
Backup power source:
Internal 3 V coin-cell lithium battery (pn
15598) to maintain program settings and
real-time clock in case of power failure
Bottle position encoder:
Verifies arm position and moves to correct
bottle if it is out of position
Multi-purpose button:
Service sampler, collect Manual Sample,
and run Auto Deploy routine
Auto Deploy routine:
Automatically sets the purge and vacuum
times based on hose length (between 25 to
100 ft)
7
PVS5120-Series Portable Samplers
Sampler status/feedback
(available after every sample):
Clock accuracy:
5.3
Bottle number, sample number, response
code, sampler battery voltage are returned
to a datalogger after every sample
8.2 minutes/month over the temperature
range or 1 minute/month at 25 °C
Vacuum Pump System
Pinch valve:
Fixed – normally open
Purge cycle:
Adjustable from 1 to 800 s; 280 s for SDI12
Suction cycle:
Variable (until liquid contacts liquid
sensing/conductivity rod in metering
chamber or adjusts automatically to two
times the purge time)
Metering chamber cover:
Nylon (standard), Teflon® (optional)
Metering chamber
level electrode:
316 stainless steel
Volume control tube:
316 stainless steel
Liquid sensing/
conductivity rod:
316 stainless steel
Intake hose:
Discharge hose material
(composite only):
Maximum horizontal
transport distance:
Ordered as a common accessory.
Campbell Scientific offers PVC hose with
25 ft and user-specified lengths. Intake
end can have a lead sinker or stainless
steel strainer. Sampler end of the hose can
have a clamp or quick connect
termination.
Latex (standard), Options: Teflon® lined,
silicone
76.2 m (250 ft) assumes no vertical lift
Maximum vertical lift (assume no horizontal transport distance)
Standard pump:
4.9 m (16 ft)
Large pump:
8.2 m (27 ft)
NOTE
8
For more information, see Appendix A, Sample Transport
Velocity (p. A-1).
PVS5120-Series Portable Samplers
6.
Device Configuration Utility Overview
Device Configuration Utility (DevConfig) software version 2.09 or higher is
used to configure the sampler controller (VSC100). The following sections
introduce the tabs and settings within the VSC100 portion of DevConfig.
Please see Section 8, Operation (p. 26), to step through specific control
types/scenarios. This section is meant to introduce a new user to each setting
in detail.
To use DevConfig, the sampler needs to be powered and the VS100 controller
needs to be connected to a PC via the 17648 USB cable (FIGURE 6-1).
FIGURE 6-1. VSC100 and 17648 USB cable
6.1
Connecting to the VSC100/Sampler via DevConfig
1.
Connect the 17648 USB cable to the front of the sampler controller
(VSC100) and the other end to the computer’s USB port (FIGURE 6-1).
Wait for Windows® to install the driver before opening DevConfig.
2.
Open DevConfig. Select VSC100 Series under Sampler. Click
Communication Port and select the correct Communications Port.
Click Connect (FIGURE 6-2).
9
PVS5120-Series Portable Samplers
FIGURE 6-2. Device Configuration VSC100
3.
Once connected to the VSC100, you are ready to configure your sampler.
6.1.1 Clock Tab
The Clock tab sets the clock on the VSC100 and sampler (FIGURE 6-3).
FIGURE 6-3. Clock tab
10
PVS5120-Series Portable Samplers
The Clock tab is only available when the user first connects to the VSC100 via
DevConfig. After the user clicks on a tab within the Settings Editor screen,
the Clock tab will no longer be available.
The Clock tab displays the Reference (computer) Time, Station (sampler)
Time, and Difference (reference time – station time).
The Reference Clock Settings allows the user to choose if the reference clock
is running in Local Daylight mode or UTC (Greenwich Mean Time).
Click Set Clock button to sync the clocks (FIGURE 6-3).
CAUTION
The clock must be synced before deploying the sampler if
A
running the sampler using Stand-Alone, Time-Based
control or if a new operation system has been loaded to the
VSC100.
The sampler clock can have up to 1 minute of drift per month when running at
roughly 25 °C. If it is running at the extremes of the temperature range, the
user could see up to 8.2 minutes of drift per month between the VSC100 clock
and the reference clock. When the sampler is triggered via a datalogger, this
drift isn’t as critical since the datalogger clock may be more precise or sync on
a more regular basis. If running under Time control type, the clocks should be
synced whenever the sampler is serviced or the bottles collected.
6.2
Settings Editor Tab
6.2.1 Info Tab
FIGURE 6-4. Info tab
11
PVS5120-Series Portable Samplers
The Info tab (FIGURE 6-4) provides the following system information
regarding the VSC100:
•
Version or Operating System identification that is running on the
controller.
•
Model Number of the controller.
•
Maximum Packet Size that can be received by the VSC100.
•
Serial Number: Specifies the manufacturer assigned serial number
for this Sampler Control Module.
•
Distribution Arm Encoder: Indicates if a distribution arm position
encoder is installed. Composite samplers do not have an arm position
encoder present.
•
Current Sample State: Returns the last sampler response code. See
later sections for the eight possible response codes returned by the
sampler.
6.2.2 Sampler Settings Tab
FIGURE 6-5. Sampler Settings tab
The Sampler Settings tab (FIGURE 6-5) contains the most common settings
to configure with regard to the PVS5120.
•
12
Control Type: Determines the sampler control and interface method.
Options include: PakBus®, Pulse, Modbus®, SDI-12, and Time.
When the sampler is controlled via Pulse or Time, it can be monitored
PVS5120-Series Portable Samplers
via PakBus® or Modbus®. If SDI-12 control type is selected, RS-485
communication with the sampler is disabled. Similarly, if PakBus® is
selected, Modbus® communication is again disabled.
•
PakBus Address: This setting specifies the PakBus® address for the
device if it is being controlled or monitored via PakBus®. It needs to
be a unique value for each sampler and datalogger on the network.
The default address for all samplers is 95. This address is used in the
program on the datalogger to reference the sampler for initiating
samples and collecting sampler status.
•
Modbus Address: Sets the sampler Modbus® address. It is active for
sampler control types: Pulse, Modbus®, and Time. It must be unique
for each sampler on your network and each datalogger. Range is 1
through 127.
•
SDI-12 Address: Sampler SDI-12 address. It must be unique to each
sampler and SDI-12 sensor connected to a single COM port on your
datalogger. It is only active when SDI-12 is selected as the Sampler
Control Type. Address values can range from 0-9, A-Z, and a-z.
•
Number of Sampler Bottles: This is the number of containers within
the sampler base.
•
Samples Per Bottle: Specifies how many samples to place in each
bottle. It can range from 1 to 999. This setting is ignored if Never
Full is set to “On/Enable”.
•
Never Full Option: Specifies whether the sampler stops or continues
sampling when each bottle(s) has been filled with the corresponding
samples per bottle setting. This option is most common in
applications where the sampler is easily accessible and containers are
collected regularly for instance at a wastewater treatment facility.
•
Purge Time: The amount of time (in seconds) the sampler hose is
evacuated before and after the sample is collected. The minimum
value is 0 s. The maximum value for PakBus®, Pulse, Modbus®, and
Time control types is 800 s. The maximum value for the SDI-12
control type is 280 s. It is possible for the final purge time to be set
separately under the Advanced Sampler Settings tab and is discussed
more below.
•
Water Present Sensor: Indicates to the sampler controller if an
optional water present sensor is installed. If the sensor is to be
connected, the sampler checks for the presence of water at the start of
each sample cycle. If water is not detected, a response code (TABLE
8-3) is generated and the cycle is aborted (Section 7.3.1, Water
Detection Probe (p. 24)).
6.2.3 Advanced Sampler Settings Tab
Most users do not need to change the following Advanced Sampler Settings if
the Auto Deploy routine is completed when the sampler is deployed in the field
(FIGURE 6-6).
13
PVS5120-Series Portable Samplers
FIGURE 6-6. Advanced Sampler Settings tab
14
•
Set Final Purge Time: Allows the Final Purge Time to be set
independently from the Purge Time.
•
Final Purge Time: Specifies the amount of time the sampler hose is
evacuated after a sample is collected. The minimum value is 0 s. The
maximum value for SDI-12 control is 280 s. The maximum value for
PakBus®, Pulse, Modbus®, and Time control types is 800 s. The
setting is only active if the Set Final Purge Time is toggled to set.
•
Sample Volume Level Set Time: The amount of time the sample is
evacuated out of the metering chamber back into the intake hose to
reach the desired volume. The sample volume is determined by the
level of the volume set rod. The minimum time is 3 s. The maximum
time for the SDI-12 control type is 30 s. The maximum time is 800 s
for PakBus®, Pulse, Modbus®, and Time control types. The Auto
Deploy routine sets this to 12 s.
•
Sample Deposit Time: The amount of time the sampler waits for the
sample volume to drain into the sample bottle. Minimum time is 5 s.
The maximum time for SDI-12 is 20 s. The maximum time for
PakBus®, Pulse, Modbus®, and Time control types is 800 s. If the
sample volume is greater than 420 mL, the deposit time must be 18 to
20 s. The Auto Deploy routine sets this to 8 s.
•
Set Vacuum Time Out: Allows the user to choose the default (two
times the Purge Time) or to independently set the time out. If the
default is chosen and the Purge Time is 0 s, the time out value is 10 s.
This is not set during Auto Deploy.
•
Vacuum Time Out: The maximum time-out for SDI-12 control type
is 330 s. The maximum vacuum time-out for PakBus®, Pulse,
Modbus®, and Time control types is 800 s.
PVS5120-Series Portable Samplers
•
Sample Chamber – Pressure Relief: Enable the pressure relief
option when collecting large sample volumes and/or using long hose
lengths (over 50 ft) for discrete samplers. This setting should not be
used with short hose lengths (less than 25 ft) since extra sample
volume may be collected. This setting vacuums the sample chamber
for a short time immediately after setting the sample volume level.
Enabling the feature removes back pressure present in long hose
lengths and reduces nozzle spray when depositing the sample to
discrete bottles.
6.2.4 Pulse Settings Tab
FIGURE 6-7. Pulse Settings tab
Once Pulse is chosen as the Control Type via the Sampler Settings tab
(Section 6.2.2, Sampler Settings Tab (p. 12)), the options within the Pulse
Settings tab become available.
•
Start Pulses: The number of input pulses needed to initiate the sample
process. The range is 1 to 10,000 pulses. The controller continues to
accumulate pulses even when the sampler is running.
•
Finish Pulses: The number of pulses returned by the sampler after
successfully finishing a sample cycle. It is important to note that no
pulses are returned if an error/fault is generated.
•
Start Pulse Type: Specifies whether the Start Pulse is a positive pulse
or a contact closure/open collector (negative pulse). See Section
8.2.6, Pulse Control (p. 50), for more details.
6.2.5 Time Settings Tab
Once Time is chosen as the Control Type via the Sampler Settings tab
(Section 6.2.2, Sampler Settings Tab (p. 12)), the options within the Time
Settings tab become available (FIGURE 6-8).
15
PVS5120-Series Portable Samplers
FIGURE 6-8. Time Settings tab
NOTE
If running with time-based control, the user must sync the
A
clock of the sampler. This is described in Section 6.1.1,
Clock Tab (p. 10).
•
CAUTION
Start Date and Time: Specifies the date and time at which sample
collection begins. Following this point in time, the schedule for all
future samples use the interval specified by the Interval Hour and
Interval Minutes settings. This setting is ignored unless the sample
Control Type is set to Time. The default start date and time are 12:05
AM on January 1, 1990. This must be changed.
If the default Start Date and Time is not changed, the
A
sampler will immediately begin sampling after the
configuration is applied to the VSC100. Make sure to set
this start date and time far enough into the future to ensure
that the sampler is in place before it starts taking samples.
•
Interval Hour: Specifies the number of hours in the time interval
between sample collections. This must be an integer value.
•
Interval Minutes: Specifies the number of minutes in the time
interval between sample collections. Must be an integer value from 0
to 59.
6.2.6 Terminal Tab
The Terminal tab allows the user to complete advanced troubleshooting with
the help of a Campbell Scientific application engineer. This tab is no longer
available once the user interacts with the Settings Editor tab.
16
PVS5120-Series Portable Samplers
7.
Installation
7.1
Field Installation
7.1.1 Required Gear for Field Deployment
•
•
•
•
•
•
•
•
•
•
•
•
•
Sampler (top, control section, base with bottles)
7/8 inch wrench (adjusting rods)
9/16 inch wrench (adjusting rods)
5/32 inch Allen wrench (adjusting rods)
1/4 inch nut driver (tightening hose clamp)
Small flat head screwdriver (wiring to datalogger)
USB cable (connecting to VSC100)
Control cable (connects datalogger to the sampler)
Internal or external 12 Vdc battery (Section 7.2.4, Battery (p. 23))
External power cable if using an external battery (Section 7.2.3.3, External
Battery Cable (pn 30819) (p. 22))
Datalogger with its own power supply, protected in an enclosure if
necessary
3/8 inch hose clamp to secure the intake hose to the sampler volume set
rod
Laptop computer with DevConfig (2.09 or higher)
7.1.2 Sampler Positioning
Place the sampler on a level surface as close as practical to the sample source
(FIGURE 7-1). Appendix A, Sample Transport Velocity (p. A-1), shows the
maximum expected lift that can maintain an intake velocity greater than 2.5 ft/s
as required by the EPA. An intake velocity greater than 2.5 ft/s prevents
settling of sediment before reaching the metering chamber, and, therefore,
biasing the sample to a lower suspended sediment concentration. It is better to
have a shorter hose and a longer control cable connecting the sampler to the
datalogger. Manhole installation may require a three-point suspension harness.
The sampler must be located above the sample source, or the liquid will flood
the machine. For situations where this is not possible, contact a Campbell
Scientific application engineer for solutions on pressurized sources.
FIGURE 7-1. Sampler installation
17
PVS5120-Series Portable Samplers
7.1.3 Steps for Field Deployment
Once the sampler is positioned complete the following steps for deployment.
1.
Loosen the brass nut to set the volume control tube to the approximate
volume required for collection by aligning the base of the tube with the
graduated marking on the metering chamber (FIGURE 7-2). It is best to
collect this volume and measure at least once to make sure it matches
expectations. If necessary, adjust the tube up or down to obtain the desired
collection volume.
2.
Set the height of the conductivity rod (FIGURE 7-2). The bottom of the
conductivity rod must be higher in the metering chamber than the volume
control tube (at least 1.3 cm (0.5 in)), but below the bottom of the float
valve barrier.
Hose Clamp
Liquid Sensing/
Conductivity Rod
Metering Chamber
Brass Nut
Intake Hose
Volume Control Tube
FIGURE 7-2. Conductivity rod and intake hose connection
3.
Connect the positive lead (+) to the top of the conductivity rod (yellow
cap).
4.
Connect the battery.
5.
18
a.
If using an internal battery, place it in the mount and connect the red
and black leads to the matching terminals. Also connect the yellow
caps with the fuse.
b.
If using an external battery, make sure the external power cable is
stripped and the correct leads are in place to connect the battery.
Connect the external power cable to the Power connector on the
Control Panel (FIGURE 7-3).
Turn on the sampler and set the three-way switch on the control panel to
the power source being used (FIGURE 7-3). If powered correctly, the
green power LED lights for several seconds and starts blinking green once
per second.
PVS5120-Series Portable Samplers
FIGURE 7-3. Control panel
6.
Connect the top of the intake hose to the volume control tube and tighten
the hose clamp (FIGURE 7-2).
7.
Route the hose so that it has a near continuous slope from the sampler to
the source liquid. This keeps the hose clear and fully drained.
8.
Put the sinker end of the intake hose into the water body to be sampled,
ensuring at least 3-inch depth. The sinker/strainer needs to be placed at a
depth that ensures it will remain submerged regardless of the flow
velocities.
9.
If you do not know the necessary purge times, run the Auto Deploy routine
by pushing and holding the Manual Control button until the sampler
begins running (approximately 5 s (FIGURE 7-3)). The Auto Deploy
routine sets the purge and the vacuum times based on the length of the
hose and the change in height between the sampler and the water source.
Wait for the sampler to stop before proceeding to Step 10.
10. Running the Auto Deploy routine drops a sample into one of the sample
bottles. If you do not want this volume as part of your final sample count,
remove the control section of the sampler and empty the sample just
collected. If necessary, replace with a clean bottle.
11. Push the Manual Control button once (FIGURE 7-3) to Service the
sampler and reset the sample count to 0.
12. Configure the sampler based on a chosen control type (see Section 8.2,
Deployment Procedures for Each Control Type (p. 28)).
13. If controlling the sampler with a datalogger or another external device,
connect the PVS5120CBL cable to the Signals connector on the Control
Panel (FIGURE 7-3), and then wire the cable to the datalogger or MD485.
Wiring is specific to a given control type. Please see the section on your
control type for wiring directions.
14. If using a datalogger, access LoggerNet and do the following (assumes
knowledge of using LoggerNet to setup the datalogger and connect either
via a direct connection or remote connection):
a.
From the LoggerNet Connect window, click Connect | Collect Now
to collect any data on the datalogger.
b.
From the Connect screen, click the Send New button. Browse to find
the datalogger program that controls the sampler; click Open | Send.
19
PVS5120-Series Portable Samplers
7.2
Sampler Components
7.2.1 Sample Volume Adjustment
FIGURE 7-4. Metering chamber and volume control tube
Setting the desired sample volume is accomplished by adjusting the height of
the volume control tube within the metering chamber (FIGURE 7-4). The tube
mounts through the top of the chamber with a gland nut fixing the position. To
adjust the sample volume, loosen the nut until the volume control tube moves
freely. Raise or lower the bottom end of the tube to the desired volume using
the lines provided on the side of the metering chamber as a guide (lines are
spaced at 100 mL intervals with the exception of one at 50 mL). Tighten the
gland nut to hold the volume control tube at the desired position.
The sampler has a volume accuracy/repeatability of ±2% or ±2 mL. If an exact
amount of liquid is required for a sampling protocol, the user should manually
collect a few samples to ensure that the rod is set at the correct location. For
example, a user wants to collect 400 mL samples. The user manually collects
several samples, and each of the samples has a 380 mL volume. The user
adjusts the liquid sensing/conductivity rod up, and manually collects more
samples. This process is repeated until the volume manually collected is ~400
mL. The liquid sensing/conductivity rod is then tightened in place. Once the
liquid sensing/conductivity rod is tightened, the sample should be within ±2%
or ±2 mL of the desired volume.
20
CAUTION
The volume control tube should always be located below the
liquid sensing/conductivity rod.
NOTE
Hold the bottom nut while loosening or tightening the top nut, or
it may become loosened from the metering chamber cover and
create an imperceptible leak in the vacuum system.
PVS5120-Series Portable Samplers
7.2.2 Liquid Sensing/Conductivity Rod
This probe, also called the liquid sensing rod or conductivity rod, is used to
stop the sample intake. Always ensure that its lower end is located above the
volume control tube and below the bottom of the float valve barrier (plastic
ball). Because the fluid intake is always turbulent, there must be at least a 1/2
inch difference between the rods. If you have a variable height water source
that may be dry at times (like a storm water application), you may want to
increase the offset to at least an inch between the volume control tube and the
conductivity rod.
In applications with substantial oil or grease, the rod can become coated and
lose its conductivity. This is prevented by cleaning the rod regularly. In
extreme cases, extra stainless steel wire can be wrapped around the liquid
sensing rod to increase its surface area.
CAUTION
The liquid sensing rod and volume control tube must be kept
clean to ensure the conductivity necessary to detect the
presence of the fluid.
7.2.3 Cables
7.2.3.1 PVS5120CBL-L Control Cable (pn 30432)
The PVS5120CBL-L control cable connects the sampler to a datalogger,
MD485, or another external device that will control or monitor the sampler
(FIGURE 7-5). The cable has a connector at one end that attaches to the
Signals connector on the Control Panel. The other end of the cable has pigtails
that connect to the external device.
FIGURE 7-5. PVS5120CBL-L Control Cable (pn 30432)
7.2.3.1.1 Wiring
When using SDI-12, the sampler connects directly to the datalogger. When
using PakBus® or Modbus®, the sampler connects to an MD485 and the
MD485 connects to the datalogger using an SC12 cable or 18663 null modem
cable (see MD485 manual for more information). The optional water detection
probe connects to the gray and yellow wires on the PVS5120CBL control
cable. TABLE 7-1 is a general wiring table.
CAUTION
Only connect the wires needed for the specific control type.
Cap, tape, or cut the unused wires at the shield. Connecting
the unused wires to ground causes problems with the
fault/red wire. Allowing the unused wires to touch can cause
shorts.
21
PVS5120-Series Portable Samplers
TABLE 7-1. PVS5120CBL-L Cable Connections
Wire
Description
Connection
Green
SDI-12/Pulse Out
Datalogger control port (C1, C3, C5, or C7)
Blue
Pulse Start
Connect directly to pulse device such as
a flow meter to trigger the sampler
based on a pulse (5 V TTL)
Purple
Ground
Datalogger G terminal
Gray
Ground
Connects to one lead of the optional
water detection probe
Yellow
Water Sensor
Connects to one lead of the optional
water detection probe
White
RS-485 A-
MD485 RS-485 A port
Black
RS-485 B+
MD485 RS-485 B port
Red
Fault
Outputs 5 V TTL
Brown
RG
Resistive ground (⏚)
7.2.3.2 USB Cable (pn 17648)
This USB cable is shipped with the sampler (FIGURE 7-6). It connects the
sampler to a PC, which is required for sampler configuration (see Section 6.1,
Connecting to the VSC100/Sampler via DevConfig (p. 9)). Drivers for this cable
should install automatically (no disk necessary) the first time it is plugged into
a PC.
NOTE
Be sure to wait enough time for the drivers to install before
opening Campbell Scientific’s DevConfig.
FIGURE 7-6. USB Cable (pn 17648)
7.2.3.3 External Battery Cable (pn 30819)
The external battery cable (pn 30819) connects an external battery to the
sampler via the Power port on the Control Panel (FIGURE 7-7). This cable is
optional.
22
PVS5120-Series Portable Samplers
FIGURE 7-7. External Battery Cable (pn 30819)
7.2.4 Battery
7.2.4.1 Internal verses External Battery Options
The PVS5120 series samplers can be powered via an internal or an external
power supply. The internal power supply is a 7 or 17 Ah, 12 Vdc battery (pn
27823 and pn 29785) that is mounted in the harness on the top of the control
section of the sampler. This battery can be charged via the charger sold as an
accessory to the sampler (pn 27825 or 29735). When charging with the
approved charger the sampler can be running and charging at the same time.
CAUTION
Do not try to operate the sampler with only the charger
plugged into ac power. An internal battery needs to be
present to operate with the charger.
External power supply for the sampler must supply 12 Vdc and be connected to
the Power connector on the Control Panel via the external power cable that
ships with the sampler. This cable needs to have leads attached that are
compatible with the users external power supply. If using an external power
supply, the user can not charge the external battery via the sampler charger. To
charge an external battery, the user must provide an independent charging
system.
7.2.4.2 VSC100 Battery
The VSC100 controller contains a 3 Vdc coin cell lithium battery (pn 15598) to
maintain user settings and the real-time clock of the sampler during loss of
system power. The battery has an estimated 5 year life under normal operating
conditions/temperatures. The battery is replaceable by the user. See Appendix
E, Lithium Battery Replacement (p. E-1), for a tutorial to replace the battery.
Since the controller is a low-power device, this uncovering can be safely done,
taking care that no conductive implement contacts sensitive circuit
components.
7.2.4.3 Fuses
Every PVS5120 ships with two fuses. The first fuse is located directly on the
Control Panel of the sampler and varies depending on which pump a user
orders (see TABLE 7-2 for more information). The second fuse is a 10 A/32 V
MDL fuse and goes into two yellow caps on the positive line to the battery.
This fuse is independent of pump type.
23
PVS5120-Series Portable Samplers
TABLE 7-2. Fuse Part Numbers
7.3
Pump Type
Fuse Description
Part Number
Standard pump
5A/250V/AGC
28314
Large pump
10A/32V/MDL
28315
Optional Components
7.3.1 Water Detection Probe
The 30144-L water detection probe (FIGURE 7-8) is a simple circuit
constructed of two stainless steel rods wired to the control cable. It acts as a
pre-check to collecting a sample by determining if water is present at the intake
hose. It should be used in locations that have a variable height water source,
for example stormwater monitoring. The sensor is placed in the water body at
a level equal to or higher than the intake hose. When used with the controller,
samples are only collected when the circuit is connected by water touching
both rods. If there is not enough water to touch both rods, the sample is
stopped and response code 6 (no sample liquid detected) is returned to the
datalogger.
The sensor is wired directly to the end of the control cable. Connect one wire
to the yellow lead of the control cable and the other wire to a ground lead on
the control cable.
FIGURE 7-8. 30144-L Water Detection Probe
7.3.2 Sinker / Strainer
The intake hose includes either a lead sinker (pn 26915) or stainless steel
sinker/strainer (pn 26914); see FIGURE 7-9; both are intended to keep the
sample line fully submerged in the source liquid. The stainless steel
sinker/strainer should be used in situations with material that clogs up a normal
sinker, or where the standard sinker could stir up bottom sediment.
24
PVS5120-Series Portable Samplers
FIGURE 7-9. Lead sinker attached to the intake hose (left) and the
sinker/strainer
7.3.3 Wall Chargers
Campbell Scientific offers a 110 Vac charger (pn 27825) and a 100 to 240 Vac
charger (pn 29735) for recharging your battery via ac power (FIGURE 7-10).
When purchased with the PVS5120, the 110 Vac charger is option –C1 and the
100 to 240 Vac charger is option –C2.
FIGURE 7-10. 110 Vac Charger (pn 27825)
7.4
Fault-Wiring Directions
Connect the fault wire of the control cable to the input of a programmable logic
controller (PLC). It is a 5 V TTL logic level with high representing a full/fault
condition (response code >0) and low = no fault (response code = 0).
25
PVS5120-Series Portable Samplers
7.5
Installation Checklist
Check the following items prior to use of the sampler:
8.
1.
Sampler is mounted securely and level.
2.
Intake Hose:
a. Free of kinks.
b. Properly installed into liquid.
c. Properly connected to volume control tube on metering chamber.
3.
Discharge hose (only in the composite samplers):
a. Free of kinks.
b. Natural downward slope to sample container.
c. Properly connected to (or in) sample container.
4.
Power requirements:
a. Check battery electrical condition.
b. Recharge if necessary.
Operation
8.1
Operating Sequence
FIGURE 8-1. Diagram of operating sequence
26
PVS5120-Series Portable Samplers
Sampling process:
1.
High pressure air purge of intake hose.
2.
Liquid is drawn into the metering chamber, up to the liquid sensing rod.
3. All excess liquid is purged from the system down to the level set by the
volume control tube.
4.
The sample is then released into either one composite container or one of
several discrete containers.
The sampling sequence begins with a high pressure air purge of the intake
assembly to remove residual liquid and obstructions. Upon completion of the
pre-purge cycle, the system converts to a vacuum state, drawing the sample
through the intake hose into the metering chamber. The system then
pressurizes, ejecting excess fluid back through the intake line until the
predetermined sample volume is achieved. The sample is then deposited under
pressure into the sample container while the post purge again clears the intake
line of any residual liquid. Purge time is a function of hose length and head
between the sampler and the sample source.
FIGURE 8-2 shows purge times for hose lengths up to 232 feet with one foot
of lift. This example is based on tests completed at 4500 ft above sea level.
There was only 1 foot of lift for all of the runs. Purge time was determined by
running the Auto Deploy routine for each hose length.
Purge Time (sec)
120
100
80
60
40
20
0
0
50
100
150
Hose Length (ft)
200
250
FIGURE 8-2. Purge time as a function of hose length
If the sampler is not able to draw a sufficient volume of fluid to complete the
circuit between the volume control tube and the conductivity rod, the unit
automatically initiates a second attempt. If the sample liquid still does not
touch the conductivity rod, the sampler purges to the level of the volume
control rod, and then drops the remaining liquid into the sample container and
returns response code 4 (vacuum time out error). The sampler waits till the
next initiation (Run command) to try to collect another sample. When a
27
PVS5120-Series Portable Samplers
vacuum time out error (response code 4) occurs, a sample bottle may overfill.
See Appendix F, Response Code 4 Scenarios (p. F-1), for some examples.
8.2
Deployment Procedures for Each Control Type
The following sections step the user through configuring the sampler, wiring
the control cable, and developing the necessary datalogger program for each
control type. For questions about any setting in DevConfig, see Section 6,
Device Configuration Utility Overview (p. 9), or the DevConfig’s help provided
at the bottom of the window when a setting is clicked. These control types
correspond to the scenarios presented in the two Quick Deploy Guides shipped
with the samplers.
TABLE 8-1 shows the default settings. The default settings are changed using
DevConfig (version 2.09 or higher).
TABLE 8-1. Default Settings
Parameter
Setting
Control Type
SDI-12
SDI-12 Address
0
Number of Sampler Bottles
24 Bottles – Discrete
Samples Per Bottle
1
Never Full Operation
Disable Never Full
Water Present Sensor
Not Installed
To use DevConfig, the sampler needs to be powered and the VSC100 controller
needs to be connected to a PC via the 17648 USB cable (FIGURE 8-3).
FIGURE 8-3. VSC100 and 17648 USB cable
28
PVS5120-Series Portable Samplers
8.2.1 Connecting to the VSC100/Sampler via DevConfig
1.
CAUTION
Connect the 17648 USB cable to the front of the sampler controller
(VSC100) and the other end to the computer’s USB port (FIGURE 8-3).
Wait for Windows® to install the driver before opening DevConfig.
User must have Admin rights on the computer to install the
drivers.
2.
Open DevConfig. Select the VSC100 Series under the Sampler. Click
Communication Port and select the correct COM port. Click Connect
(FIGURE 8-4).
FIGURE 8-4. Device Configuration VSC100
CAUTION
3.
Once connected to the VSC100, you are ready to configure your sampler.
4.
Click the Clock tab at the top of the window (FIGURE 6-3). Next click
Set Clock, which syncs the sampler clock with the computer clock. The
sampler clock accuracy is 8.2 minutes/month over the temperature stated
temperature range or roughly 1 minute/month at 25 °C. Also the
VSC100’s internal battery maintains the clock settings (see Section 6.1.1,
Clock Tab (p. 10), for more information).
If a new operating system is loaded to the VSC100, the clock
must be synced before deploying the sampler.
29
PVS5120-Series Portable Samplers
8.2.2 Time-Based Control
Time-based control allows the PVS5120 to run as a stand-alone sampler.
Status values are not reported unless a datalogger is used for monitoring the
sampler. A datalogger can be used to monitor the sampler over RS-485 and
uses either the PakBus® or Modbus® protocol. An MD485 is also required
(see Appendix C, Monitoring Sampler Status via RS-485 (p. C-1)).
CAUTION
If running with time-based control, the user must sync the
A
clock of the sampler. This is described above in Section
6.1.1, Clock Tab (p. 10).
1.
30
Once connected to the VSC100, click the Sampler Settings tab (FIGURE
8-5).
a.
Set the Control Type to Time.
b.
If using PakBus® to monitor the sampler over RS-485, set the
PakBus Address.
c.
If using Modbus® to monitor the sampler over RS-485, set the
Modbus Address.
d.
Set the Number of Sampler Bottles.
e.
Set the Samples Per Bottle. It can range from 1 to 999. This setting
is ignored if Never Full is set to On/Enable.
f.
Typically leave the Never Full Operation disabled.
g.
If the Auto Deploy routine has been run, the Purge Time should
already be set. If not using Auto Deploy, enter the amount of time the
sampler hose is evacuated before and after the sample is collected.
h.
If a Water Present Sensor is present, click to install. This sensor is
wired to the sampler control cable. See Section 7.3.1, Water
Detection Probe (p. 24), for more information.
PVS5120-Series Portable Samplers
FIGURE 8-5. Time-Based Sampler Settings screen
2.
Click the Advanced Sampler Settings tab (FIGURE 6-6). In most cases,
only the Enable Pressure Relief setting is changed.
a.
3.
Click the Time Settings tab.
a.
CAUTION
Set Sample Chamber – Pressure Relief. If collecting a sample
volume >450 mL or using an intake hose longer than 50 ft, this feature
must be enabled.
Change the Start Date and Time to a time period in which the
sampler will be fully installed.
For the Start Date and Time, do not use the default value
A
of 12:05 AM on January 1, 1990. If you do not change the
default setting, the sampler will immediately begin sampling
after the configuration is applied to the VSC100.
Additionally, the Start Date and Time needs to be set far
enough into the future so that the sampler is fully installed
before attempting to take a sample.
4.
b.
For Interval Hours, specify the number of hours in the time interval
between sample collections.
c.
For Interval Minutes, specify the number of minutes in the time
interval between sample collections (0 to 59 minutes).
Click Apply. It is a good idea to save the configuration file for future
reference. Also if you are using a datalogger to monitor the sampler over
31
PVS5120-Series Portable Samplers
RS-485, see Appendix C, Monitoring Sampler Status via RS-485 (p. C-1), for
additional deployment steps.
8.2.3 SDI-12 Control
SDI-12 control runs the sampler as an SDI-12 sensor. The sampler connects to
the datalogger using the PVS5120CBL control cable. The SDI12Sensor
instruction issues the sampler’s M! command to a specific port on the
datalogger. The SDI-12 address is assigned in DevConfig and referenced in the
datalogger program. Four status variables are returned to the datalogger via
SDI-12 once the sample is complete and in the case of the discrete sampler the
arm moved to the next location.
The sampler can run in concurrent SDI-12 mode by using a C! command. The
response time of the sampler varies depending on the purge, vacuum, and
sample drop times set up in DevConfig (for example, the longer the hose and
the greater the lift between the sampler and the water source the longer
response time to the M! command).
1.
32
Once connected to the VSC100 in DevConfig, click the Sampler Settings
tab (FIGURE 8-6).
a.
Set the Control Type to SDI-12.
b.
Typically use the default SDI-12 Address of 0.
c.
Set the Number of Sampler Bottles.
d.
Set the Samples Per Bottle. It can range from 1 to 999. This setting
is ignored if Never Full is set to On/Enable.
e.
Typically leave the Never Full Operation disabled.
f.
If the Auto Deploy routine has been run, the Purge Time is already
set. If not using Auto Deploy, enter the amount of time the sampler
hose is evacuated before and after the sample is collected.
g.
If a Water Present Sensor is present, click to install. This sensor is
wired to the sampler control cable. See Section 7.3.1, Water
Detection Probe (p. 24), for more information.
PVS5120-Series Portable Samplers
FIGURE 8-6. SDI-12 Sampler Settings screen
2.
Click the Advanced Sampler Settings tab (FIGURE 6-6). In most cases,
only the Enable Pressure Relief setting is changed; reasons to change the
other options from factory defaults are discussed in Section 6.2.3,
Advanced Sampler Settings Tab (p. 13).
a.
Set Sample Chamber – Pressure Relief. If collecting a sample
volume >450 mL or using an intake hose longer than 50 ft, this feature
must be enabled.
3.
Click Apply. It is a good idea to save the configuration file for future
reference.
4.
Connect the PVS5120CBL cable to the front of the sampler, and wire the
cable to the datalogger (TABLE 8-2).
5.
Use LoggerNet to connect to the datalogger. The following steps assume a
knowledge of how to setup the datalogger and connect either via a direct
connection or remote connection.
a.
From the LoggerNet Connect window, click Connect | Collect Now
to collect any data on the datalogger.
b.
From the Connect screen, click the Send New button. Browse to find
the CRBasic program that controls the sampler via SDI-12 (see
Section 8.2.3.2, SDI-12 Programming (p. 34). Click Open | Send.
33
PVS5120-Series Portable Samplers
8.2.3.1 Wiring for SDI-12 Control
TABLE 8-2. SDI-12 Wiring (PVS5120CBL-L Cable)
Wire
Description
Connection
Green
SDI-12/Pulse Out
Datalogger control port (C1, C3, C5, or C7)
Blue
Pulse Start
Not used
Purple
Ground
Datalogger G
Gray
Ground
Connects to one lead on the optional
water detection probe
Yellow
Water Sensor
Connects to one lead on the optional
water detection probe
White
RS-485 A–
Not used
Black
RS-485 B+
Not used
Red
Fault
Not used
Brown
RG
Datalogger’s ⏚
8.2.3.2 SDI-12 Programming
In CRBasic, use the SDI12Recorder() instruction to program the datalogger to
control the sampler. This instruction sends a request to the sensor to make a
measurement and then retrieves the measurement from the sensor. The
sampler returns the following four status values after it has completed the
sampling procedure and the distribution arm has advanced as necessary.
34
1.
Sample bottle number: Bottle number that the sample is deposited in (1
to 24).
2.
Sample number: The number of samples collected for this bottle.
3.
Response code: Numeric code ranging from 0 to 8 that represents
different conditions (TABLE 8-3).
4.
Sampler battery voltage: Returns the battery voltage just before that
sample was collected.
PVS5120-Series Portable Samplers
TABLE 8-3. Numeric Response Codes of the VSC100
Numeric
Response Code
Definition
0
No Error: Successful Sample
1
All samples complete
2
Low start battery (Voltage <11.0 Vdc)
3
Low run battery
(Voltage <10.5 Vdc occurs after pumping has started)
4
Sampler vacuum timed out; no sample detected
5
Sample overflow detected (only if an overflow sensor is
installed; only available for stationary samplers)
6
No sample liquid detected (only if water detection probe
is installed and configured)
7
Arm calibration error
8
Liquid Sensing/Conductivity Rod and
Volume Control Tube are shorted
For all CRBasic dataloggers, except the CR200(X) series, the
SDI12Recorder() instruction has the following form:
SDI12Recorder(Destination, SDIPort, SDIAddress, “SDICommand”,
Multiplier, Offset)
Where,
NOTE
•
Destination – For the sampler, the destination location should be a
four value array.
•
SDIPort – Datalogger control port to which the sampler is connected.
•
SDIAddress – This address must match the sampler’s address. The
sampler’s default address of 0 should be used unless more than one
SDI-12 device is connected to the same port. The sampler’s default
address is changed using DevConfig.
•
SDICommand – The only commands recognized by the sampler are
“M!” and “C!”. The “C!” command should only be used if you want
to run SDI-12 sensors concurrently. The command needs to be
enclosed in quotes.
The PVS5120 does not support extended SDI-12 commands.
Use the default values of 1.0 and 0.0 for the Multiplier and Offset, respectively.
35
PVS5120-Series Portable Samplers
When using a CR200(X), the SDI12Recorder() instruction has the following
form:
SDI12Recorder(Destination, “OutString”, Multiplier, Offset)
Where,
•
OutString – The sampler’s SDI-12 address and SDI-12 command
(must be enclosed in quotes). For example when using the default
SDI-12 address of 0, enter “0C!”.
For more information on each of the SDIRecorder parameters, see the
CRBasic Help. See Appendix B.1.1, CR1000 SDI-12 Programs (p. B-1), and
Appendix B.1.2, CR200X Series Programs (p. B-3), for complete example
programs. The example programs are available for download at:
www.campbellsci.com/19_1_767.
8.2.4 PakBus® Control
Both the PakBus® and Modbus® control types use the MD485 to
communicate via RS-485. When using RS-485, connect the sampler to an
MD485 using the PVS5120CBL control cable and then connect the MD485 to
the datalogger using an SC12 cable. The CRBasic program uses either a
SendVariables() or GetVariables() instruction to trigger a sample and return
the status values. The PakBus® address is assigned in DevConfig and
referenced in the datalogger program. The PakBus® address must be unique
for each sampler on your network and for each datalogger. Four status
variables are returned to the datalogger once the sample is complete. If using a
discrete sampler, the arm moves to the next location.
The datalogger program needs to trigger a sample and then ask for the status
values (see Appendix B.2, PakBus® Example Programs (p. B-4)). The response
time of the sampler varies depending on the purge, vacuum, and sample drop
times set up in DevConfig. The longer the hose and the greater the lift between
the sampler and the water source, the longer it takes for status values to be
returned.
8.2.4.1 Configuring the MD485
36
1.
Connect a serial cable to the RS-232 port on the MD485 and to the
computer.
2.
Supply power (12 Vdc) to the MD485 by the power jack or through the
+12 V line on the CS I/O connector. Use the SC12 serial cable to connect
the MD485’s CS I/O port to the datalogger’s CS I/O port.
3.
Open DevConfig. Click Peripheral. Select MD485. Select the
Communication Port. Push the Program button on the MD485. Click
Connect. The program button is located to the right of the RS-485
connectors on the modem’s front panel (FIGURE 8-7).
PVS5120-Series Portable Samplers
FIGURE 8-7. MD485 Device Configuration screen
4.
Click the MD485 tab. Select CS I/O and RS-485 in the Active Ports box.
Select Transparent Communication in the Protocol box (FIGURE 8-8).
FIGURE 8-8. MD485 Deployment tab
5.
Click the CS I/O tab. Set the mode based on the type of datalogger being
used. Below shows the configuration for a CR1000 with SDC7 used for
the address (FIGURE 8-9).
37
PVS5120-Series Portable Samplers
FIGURE 8-9. MD485 CS I/O tab
6.
Click the RS-485 tab. Set Baud Rate to 38.4 kbps. Set Parity to None.
Set Character Length to 8 bits. Set Stop Bits to 1 bit (FIGURE 8-10).
FIGURE 8-10. MD485 RS-485 tab
7.
Click Apply.
8.2.4.2 Configuring Sampler for PakBus® Control
1.
38
Once connected to the VSC100 in DevConfig, click the Sampler Settings
tab (FIGURE 8-11).
a.
Set the Control Type to PakBus.
b.
Set the PakBus Address. This is the address of the sampler and is
referenced in the CRBasic program running on the datalogger. The
default PakBus® address for the samplers is 95. Each sampler needs
to be uniquely addressed, as well as each datalogger on the network.
c.
Set the Number of Sampler Bottles.
d.
Set the Samples Per Bottle. It can range from 1 to 999. This setting
is ignored if Never Full is set to On/Enable.
PVS5120-Series Portable Samplers
e.
Typically leave the Never Full Operation disabled. The Never Full
Operation is typically enabled only when the sampler is easily
accessible and containers are collected regularly, for instance at a
waste water treatment facility.
f.
If the Auto Deploy routine has been run, the Purge Time is already
set. If not using Auto Deploy, enter the amount of time the sampler
hose is evacuated before and after the sample is collected. The
maximum value is 800 s. The final purge time can be set separately
(refer to Section 6.2.3, Advanced Sampler Settings Tab (p. 13)).
g.
If a Water Present Sensor is present, click to install. This sensor is
wired to the sampler control cable. See Section 7.3.1, Water
Detection Probe (p. 24), for more information.
FIGURE 8-11. PakBus® Setting Editor screen
6.
Click the Advanced Sampler Settings tab (FIGURE 6-6). In most cases,
the only setting a user may want to change is to Enable Pressure Relief
setting.
a.
7.
Set Sample Chamber – Pressure Relief. If collecting a sample
volume >450 mL or using an intake hose longer than 50 ft, this feature
must be enabled.
Click Apply. It is a good idea to save the configuration file for future
reference.
39
PVS5120-Series Portable Samplers
8.
Connect the PVS5120CBL cable to the front of the sampler and wire the
cable to the MD485 (TABLE 8-4). Connect the MD485 to the datalogger
using the SC12 cable or the null modem cable.
9.
Use LoggerNet to connect to the datalogger. The following steps assume a
knowledge of how to setup the datalogger and connect either via a direct
connection or remote connection.
a.
From the LoggerNet Connect window, click Connect | Collect Now
to collect any data on the datalogger.
b.
From the Connect screen, click the Send New button. Browse to find
the CRBasic program that controls the sampler via PakBus® (see
Section 8.2.4.4, Programming for PakBus® Control (p. 40)). Click
Open | Send.
8.2.4.3 Wiring for PakBus® Control
TABLE 8-4. PakBus® Control Connections (PVS5120CBL-L Cable)
Wire
Description
Connection
Green
SDI-12/Pulse Out
Not used
Blue
Pulse Start
Not used
Purple
Ground
Not used
Gray
Ground
Connects to one lead of the optional
water detection probe
Yellow
Water Sensor
Connects to one lead on the optional
water detection probe
White
RS-485 A-
MD485 RS-485 A port
Black
RS-485 B+
MD485 RS-485 B port
Red
Fault
Not used
Brown
RG
MD485 RG terminal (⏚)
8.2.4.4 Programming for PakBus® Control
PakBus® can be used to control the sampler and to monitor a timed-based or
pulse controlled sampler. When using PakBus®, the datalogger communicates
with the sampler via RS-485. An MD485 multidrop modem is required for this
communication.
In CRBasic, the SendVariables() or GetVariables() instruction initiates the
sample and collects the returned status values. These instructions access the
Public table stored in the VSC100 controller. TABLE 8-5 provides the array
value, name, and description of the VSC100 Public Table.
The sampler returns four status values regardless of control type after it has
completed the sampling procedure and the distribution arm has advanced as
necessary. These status values are array values 12 through 15 in TABLE 8-5.
40
PVS5120-Series Portable Samplers
NOTE
When getting data from the sampler, the source datalogger is the
sampler.
The SendVariables() and GetVariables() instructions have the following
structure:
SendVariables(ResultCode, ComPort, NeighborAddr, PakBusAddr, Security,
TimeOut, "TableName", "FieldName", Variable, Swath)
GetVariables(ResultCode, ComPort, NeighborAddr, PakBusAddr, Security,
TimeOut, “TableName”, “FieldName”, Variable, Swath)
Where,
•
ResultCode – This is the PakBus® communications response. See
CRBasic Help for more information.
•
ComPort – The communications port used to communicate with the
source device.
•
NeighborAddr – A static route to the source datalogger (for example,
the PakBus® address of a neighbor datalogger that the destination
datalogger can go through to communicate with the source
datalogger).
•
PakBusAddr – The PakBus® address of the sampler. Typically the
default address of 95 can be used unless multiple samplers are
connected to the same port. This address is configured in DevConfig.
•
Security – Typically enter 0000.
•
TimeOut – Enter 0.
•
TableName – The sampler’s data table that the value(s) is retrieved
from. For the TableName, enter “Public” (must be enclosed in
quotes).
•
FieldName – To retrieve status values, enter “Bottle” (must be
enclosed in quotes). To start sample collection, enter “Start” (must
be enclosed in quotes).
•
Variable – The variable or variable array in which the values retrieved
from the source datalogger are stored. This parameter must be
dimensioned equal to or greater than the Swath retrieved from the
source datalogger.
•
Swath – The number of values that are retrieved from the source
datalogger.
For more information on each of the SendVariables and GetVariables
parameters, see the CRBasic Help. Section 8.2.4.5, PakBus® Example
Instructions (p. 43), provides some example SendVariables() and
GetVariables() instructions for controlling the sampler. Complete program
41
PVS5120-Series Portable Samplers
examples for the CR1000 can be found on our website at
www.campbellsci.com/19_1_767 and in Appendix B.2, PakBus® Example
Programs (p. B-4).
TABLE 8-5. VSC100 Public Table for PakBus® Control
42
Array
Value
Name
1
Bottles
2
SampPerBottle
3
NeverFull
4
PurgeTime1
5
LevelSetTime
Time, in seconds, to evacuate sample chamber to
desired sample volume.
6
DepositTime
Time in seconds to hold pinch valve open to
allow sample to be deposited in bottle.
7
PurgeTime2
Final purge time, in seconds, that the sampler
hose is evacuated after collecting sample.
8
UsePurgeTime
A true/false variable which indicates if
PurgeTime2 is set independently of PurgeTime1
or is set to same value as PurgeTime1.
9
SetTimeOut
True/false value that indicates whether the
vacuum time is set by the user or automatically
set (2 x PurgeTime1).
10
TimeOut
Vacuum timeout, in seconds, to determine how
long sampler should attempt to collect a sample
before triggering an error.
Description
Number of bottles in sampler.
Number of samples to be put in each bottle(s).
Determines if the sampler loops without stopping
(must be manually serviced before the sampler is
full to prevent overflow).
Initial purge time, in seconds, that the sampler
hose is purged before collecting sample.
The sampler type determined by the
corresponding integer value:
0 = PakBus, 1 = Pulse, 2 = Modbus,
3 = SDI-12, 4 = Time
11
SamplerType
12
Bottle
13
SampleCount
Displays the number of samples deposited in to
this bottle. Value is always 1 for never full
option. (Read only.)
14
Response
Displays numeric code ranging from 0 to 8 that
represents a different condition (TABLE 8-3). 0
indicates no errors. (Read only.)
15
Batt
Returns the sampler’s battery voltage just before
that sample was collected. (Read only.)
Indicates bottle number that the sample is
deposited in (1 to 24). Value is always 1 for
composite sampler. (Read only.)
PVS5120-Series Portable Samplers
8.2.4.5 PakBus® Example Instructions
Below shows example CRBasic instructions for using PakBus® to control the
sampler.
This instruction initiates a sample:
SendVariables(Result(2),ComSDC7,0,sampler_PakBus_address,0000,0,
"Public","Start",Start_sample,1)
This instruction collects the status values:
GetVariables(Result(3),ComSDC7,0,sampler_PakBus_address,0000,0,
"Public","Bottle",Sampler_status(1),4)
8.2.5 Modbus® Control
Both PakBus® and Modbus® control types use the MD485 to communicate
with a Campbell Scientific datalogger via RS-485. When using RS-485,
connect the sampler to an MD485 using the PVS5120CBL control cable and
connect the MD485 to the datalogger using an SC12 cable. The CRBasic
program uses the ModbusMaster() instruction. The Modbus® address is
assigned in DevConfig and referenced in the datalogger program. The
Modbus® address must be unique for each sampler on your network and for
each datalogger.
Four status variables are returned to the datalogger once the sample is complete
and in the case of the discrete sampler the arm moved to the next location. The
program running on the datalogger needs to monitor the sampler for the sample
to complete and then asks for the status values (see Appendix B.3, Modbus®
Example Programs (p. B-6)). The response time of the sampler varies depending
on the purge, vacuum, and sample drop times set up in DevConfig. The longer
the hose and the greater the lift between the sampler and the water source, the
longer it takes for status values to be returned.
It is also possible to use a third party’s PLC to control the sampler via RS-485.
8.2.5.1 Configuring the MD485
1.
Connect a serial cable to the RS-232 port on the MD485 and to the
computer.
2.
Supply power (12 Vdc) to the MD485 by the power jack or through the
+12 V line on the CS I/O connector. The SC12 serial cable connects the
MD485’s CS I/O port to the datalogger’s CS I/O port; an SC12 cable is
shipped with the MD485.
3.
Open DevConfig. Click Peripheral. Select MD485. Select the
Communication Port. Push the Program button on the MD485. Click
Connect. The program button is located to the right of the RS-485
connectors on the modem’s front panel (FIGURE 8-12).
43
PVS5120-Series Portable Samplers
FIGURE 8-12. MD485 Device Configuration screen
4.
Click the MD485 tab. Select CS I/O and RS-485 in the Active Ports box.
Select Transparent Communication in the Protocol box (FIGURE 8-13).
FIGURE 8-13. MD485 Deployment tab
5.
44
Click the CS I/O port tab. Set the mode based on the type of datalogger
being used. Below shows the configuration for a CR1000 with SDC7 for
the address (FIGURE 8-14).
PVS5120-Series Portable Samplers
FIGURE 8-14. MD485 CS I/O tab
6.
Click the RS-485 tab. Set Baud Rate to 38.4k. Set Parity to None. Set
Character Length to 8 bits. Set Stop Bits to 1 bit (FIGURE 8-15).
FIGURE 8-15. MD485 RS-485 tab
7.
Click Apply.
8.2.5.2 Configuring Sampler for Modbus® Control
1.
Click the Sampler Settings tab (FIGURE 8-16).
a.
Set the Control Type to Modbus.
b.
Set the Modbus Address. This is the address of the sampler and is
referenced in the CRBasic program running on the datalogger. The
default Modbus® address for the samplers is 1. Possible values are
1–127.
c.
Set the Number of Sampler Bottles.
d.
Set the Samples Per Bottle. It can range from 1 to 999. This setting
is ignored if Never Full is set to On/Enable.
e.
Typically leave the Never Full Operation disabled.
45
PVS5120-Series Portable Samplers
f.
If the Auto Deploy routine has been run, the Purge Time will already
be set. If not using Auto Deploy, enter the amount of time the sampler
hose is evacuated before and after the sample is collected. The
maximum value is 800 s.
h.
If a Water Present Sensor is present, click to install. This sensor is
wired to the sampler control cable. See Section 7.3.1, Water
Detection Probe (p. 24), for more information.
FIGURE 8-16. Modbus® Setting Editor screen
2.
Click the Advanced Sampler Settings tab (FIGURE 6-6). In most cases,
the only thing a user will want to change is to Enable Pressure Relief
setting.
a.
46
Set Sample Chamber – Pressure Relief. If collecting a sample
volume >450 mL or using an intake hose longer than 50 ft, this feature
must be enabled.
3.
Click Apply. It is a good idea to save the configuration file for future
reference.
4.
Connect the PVS5120CBL cable to the front of the sampler and wire the
cable to the MD485 (TABLE 8-6). Connect the MD485 to the datalogger
using the SC12 cable or the null modem cable.
PVS5120-Series Portable Samplers
5.
Use LoggerNet to connect to the datalogger. The following steps assume a
knowledge of how to setup the datalogger and connect either via a direct
connection or remote connection.
a.
From the LoggerNet Connect window, click Connect and then
Collect Now to collect any data on the datalogger.
b.
From the Connect screen, click the Send New button. Browse to find
the CRBasic program that controls the sampler via Modbus® (see
Section 8.2.5.4, Programming for Modbus® Control with Campbell
Scientific Datalogger (p. 47). Click Open | Send.
8.2.5.3 Wiring for Modbus® Control
TABLE 8-6. Modbus® Control Connections (PVS5120CBL-L Cable)
Wire
Description
Connection
Green
SDI-12/Pulse Out
Not used
Blue
Pulse Start
Not used
Purple
Ground
Not used
Gray
Ground
Connects to one port on the optional
water detection probe
Yellow
Water Sensor
Connects to one port on the optional
water detection probe
White
RS-485 A-
MD485 RS-485 A port
Black
RS-485 B+
MD485 RS-485 B port
Red
Fault
Not used
Brown
RG
MD485 RG port (⏚)
8.2.5.4 Programming for Modbus® Control with Campbell Scientific Datalogger
Modbus® can be used to control the sampler and to monitor a timed-based or
pulse controlled sampler. When using Modbus®, the datalogger communicates
with the sampler via RS-485. An MD485 multidrop modem is required for this
communication.
The ModbusMaster() instruction initiates a sample and collects the returned
status values. This instruction accesses the Public table stored in the VSC100
controller. TABLE 8-7 provides a description of the Modbus® coils and input
registers stored in the VSC100 Public Table.
The sampler returns four status values regardless of control type after it has
completed the sampling procedure and the distribution arm as advanced as
necessary. These status values are registers 23 through 29 in TABLE 8-7.
Running the sampler as a Modbus® slave while the datalogger acts as the
Modbus® master device requires issuing the ModbusMaster() instruction
multiple times. The settings/options chosen within the instruction depend on
whether you are triggering a sample, checking to see if it is done sampling, or
asking for the status values.
47
PVS5120-Series Portable Samplers
TABLE 8-7. Generic Modbus® Control and Monitoring of the Sampler
CRBasic ModbusMaster()
Function Start Length
1 or 15
1
1
1 or 15
2
1
1 or 15
3
1
3 or 16
1
1
Coil
00001
00002
00003
Register*
40001 & 40002
Name
Start
Serviced
Auto Deploy
3 or 16
3
1
40003 & 40004
SampPerBottle
3 or 16
5
1
40005 & 40006
NeverFull
3 or 16
7
1
40007 & 40008
PurgeTime1
3 or 16
9
1
40009 & 40010
LevelSetTime
3 or 16
11
1
40011 & 40012
DepositTime
3 or 16
13
1
40013 & 40014
PurgeTime2
3 or 16
15
1
40015 & 40016
UsePurgeTime
3 or 16
17
1
40017 & 40018
SetTimeOut
3 or 16
19
1
40019 & 40020
TimeOut
3 or 16
21
1
40021 & 40022
SamplerType
3
23
1
40023 & 40024
Bottle
3
25
1
40025 & 40026
SampleCount
3
27
1
40027 & 40028
Response
3
29
1
40029 & 40030
Batt
Bottles
Description
Start
Serviced
Auto Deploy
Number of bottles in sampler.
Number of samples to be put in each
bottle(s).
Determines if the sampler loops without
stopping (must be manually serviced before
the sampler is full to prevent overflow).
Initial purge time, in seconds, that the
sampler hose is purged before collecting
sample.
Time, in seconds, to evacuate sample
chamber to desired sample volume.
Time, in seconds, to hold pinch valve open to
allow sample to be deposited in bottle.
Final purge time, in seconds, that the sampler
hose is evacuated after collecting sample.
A true/false variable which indicates if
PurgeTime2 is set independently of
PurgeTime1 or is set to same value as
PurgeTime1.
True/false value that indicates whether the
vacuum time is set by the user or
automatically set (2 x PurgeTime1).
Vacuum timeout, in seconds, to determine
how long sampler should attempt to collect a
sample before triggering an error.
The sampler type determined by the
corresponding integer value:
0 = PakBus, 1 = Pulse, 2 = Modbus,
3 = SDI-12
Indicates bottle number that the sample is
deposited in (1 to 24). Value is always 1 for
composite sampler. (Read only.)
Displays the number of samples deposited in
to this bottle. Value is always 1 for never full
option. (Read only.)
Displays numeric code ranging from 0 to 8
that represents a different condition (TABLE
8-3). 0 indicates no errors. (Read only.)
Returns the sampler’s battery voltage just
before that sample was collected. (Read
only.)
*The Registers contain 15 values encoded as IEEE 754, 4-byte floating point (CDAB)
48
PVS5120-Series Portable Samplers
The ModbusMaster() instruction has the following form:
ModbusMaster(ResultCode, ComPort, BaudRate, ModbusAddr, Function,
Variable, Start, Length, Tries, TimeOut, [ModbusOption])
Where,
•
ResultCode – The ResultCode parameter is a variable that holds the
results of the communication attempt.
•
ComPort – The ComPort parameter specifies the communication port
and mode that are used for this instruction.
•
BaudRate – Use 38400 bps.
•
ModbusAddr – Enter the Modbus® address set in DevConfig.
•
Function – Enter the appropriate code (TABLE 8-8) to define what
data is being sent to or received from the ModbusSlave. For
example, use function code 1 to see if the sampler is still running.
Use function code 3 to return the status values. Use function code 15
to set the start sample flags high.
TABLE 8-8. Modbus® Function Codes
Code
Name
Description
01
Read Coil/Port Status
Reads the On/Off status of discrete
output(s) in the ModbusSlave
03
Read Holding Registers
Reads the binary contents of holding
register(s) in the ModbusSlave
15
Force Multiple Coils/Ports
Forces multiple Coils/Ports in the
ModbusSlave to either On or Off
16
Write Multiple Registers
Writes values into a series of holding
registers in the ModbusSlave
•
Variable – The Variable parameter is used to specify the variable
array that is used as the source of data to send, or the variable array
that is used as the destination for data received.
•
Start – The Start parameter is used to specify the first number of the
register or coil that is acted upon with this instruction. TABLE 8-7
shows the descriptions of the registers and coils for the sampler.
When initiating a sample, enter 1 for this parameter. When collecting
all of the status values, enter 23 for this parameter.
•
Length – The Length parameter is used to specify the number of
variables to act upon with this instruction. The Length for initiating a
sample is 1. The Length for collecting status values is 4.
49
PVS5120-Series Portable Samplers
•
Tries – The Tries parameter is used to specify the number of times the
ModbusMaster datalogger should attempt to communicate with the
SlaveModbus datalogger before moving on to the next instruction.
•
TimeOut – The TimeOut parameter specifies the amount of time, in
0.01 seconds, that the ModbusMaster datalogger should wait for a
response from the ModbusSlave before considering the attempt a
failure.
For more information on each of the ModbusMaster() parameters, see
CRBasic Help. Section 8.2.5.5, Modbus® Example Instructions (p. 50), provides
some example ModbusMaster() instructions. Complete program examples for
the CR1000 can be found on our website at www.campbellsci.com/19_1_767
and in Appendix B.3, Modbus® Example Programs (p. B-6).
8.2.5.5 Modbus® Example Instructions
This instruction initiates a sample and uses Function 15 to set the flag in the
sampler:
ModbusMaster(MbResult(2),ComSDC7,38400,MBAddress,15,Start_sample,1,
1,3,100,0)
This instruction checks to see if the sampler is still running:
ModbusMaster(MbResult(1),ComSDC7,38400,MBAddress,1,Start_sample,1,1
,3,100,0)
This instruction collects the status values:
ModbusMaster(MbResult(3),ComSDC7,38400,MBAddress,3,Sampler_status(),
23,4,3,100,0)
8.2.6 Pulse Control
The sampler can be directly connected to a 0 to 5 V TTL pulse outputting
device via the PVS5120CBL control cable. The sampler counts the
accumulating pulses from the external device, for example a flow meter, to
trigger a sample.
The sampler monitors either a 5 V contact closure or a positive pulse
waveform. Either type of pulse needs to generate at least a 50 ms pulse width.
When running the sampler via pulse control the four status values will not be
returned to the user unless monitoring the sampler via RS-485 (similar to timebased control). See Appendix C, Monitoring Sampler Status via RS-485 (p. C-1)
to learn how to configure for RS-485 monitoring.
NOTE
50
If using a datalogger, it may be easier to wire the pulse output
device (flow meter or rain gage) to the datalogger, and then have
the datalogger monitor and record the pulses. The datalogger can
control the sampler via SDI-12 or RS-485 and return the four
status values to the user.
PVS5120-Series Portable Samplers
1.
Once connected to the VSC100, click the Sampler Settings tab (FIGURE
8-17).
a.
Set the Control Type to Pulse.
b.
Set the Number of Sampler Bottles.
c.
Set the Samples Per Bottle. It can range from 1 to 999. This setting
is ignored if Never Full is set to On/Enable.
d.
Typically leave the Never Full Operation disabled.
e.
If the Auto Deploy routine has been run, the Purge Time will already
be set. If not using Auto Deploy, enter the amount of time the sampler
hose is evacuated before and after the sample is collected. The
maximum value is 800 s.
f.
If a Water Present Sensor is present, click to install. This sensor is
wired to the sampler control cable. See Section 7.3.1, Water
Detection Probe (p. 24), for more information.
FIGURE 8-17. Pulse Control settings
2.
Click the Advanced Sampler Settings tab (FIGURE 6-6). In most cases,
the only thing a user will want to change is to Enable Pressure Relief
setting; however, if you are interested in why the other options should be
changed from factory defaults, see Section 6.2.3, Advanced Sampler
Settings Tab (p. 13).
51
PVS5120-Series Portable Samplers
a.
3.
NOTE
Set Sample Chamber – Pressure Relief. If collecting a sample
volume >450 mL or using an intake hose longer than 50 ft, this feature
must be enabled.
Click the Pulse Settings tab (FIGURE 8-18).
a.
Set Start Pulses. This is number of input pulses needed to initiate the
sample process.
b.
Set the number of Finish Pulses that the sampler will return to the
datalogger when a successful sample is collected.
No pulses are returned if an error/fault is generated.
A
c.
Set Start Pulse Type to either Positive Pulse in the case of a flow
meter (positive pulse type takes a 0 V signal and raises it up to 5 V) or
Contact Closure in the case of a tipping bucket rain gage (contact
closure drives a line from 5 V/normally open line down to 0
V/closed).
FIGURE 8-18. Pulse Settings tab
4.
Click Apply. It is a good idea to save the configuration file for future
reference.
5.
Connect the sampler cable to the front of the sampler and wire the cable to
the controlling device that is providing pulses.
6.
If a datalogger provides the pulses or is used to monitor the sampler, use
LoggerNet to connect to the datalogger. The following steps assume a
knowledge of how to setup the datalogger and connect either via a direct
connection or remote connection.
a.
52
From the LoggerNet Connect window, click Connect | Collect Now
to collect any data on the datalogger.
PVS5120-Series Portable Samplers
From the Connect screen, click the Send New button. Browse to find
the CRBasic program that controls or monitors the sampler. Click
Open | Send.
b.
8.2.6.1 Wiring for Pulse Control
TABLE 8-9. Pulse Control Wiring (PVS5120CBL-L Cable)
Wire
Description
Connection
Green
SDI-12/Pulse Out
PLC or datalogger control port*
Blue
Pulse Start
External device 0 to 5 V TTL
Purple
Ground
External device ground
Gray
Ground
Optional water detection probe
Yellow
Water Sensor
Optional water detection probe
White
RS-485 A–
MD485 RS-485 A port**
Black
RS-485 B+
MD485 RS-485 B port**
Red
Fault
Not used
Brown
RG
MD485 RG port**
*Connect only if producing a pulse after a successful sample
**Only use if monitoring the sampler over RS-485 for status feedback
9.
Maintenance and Troubleshooting
The PVS5120 is designed to give years of trouble-free service with reasonable
care. However, if factory repair is needed, first contact a Campbell Scientific
application engineer to obtain an RMA (Return Materials Authorization)
number. An RMA number and product-safety documents (forms are provided)
are required prior to any repair shipments being accepted at Campbell
Scientific. See the Assistance statement at the beginning of this manual for
more information.
9.1
Maintenance
The following procedures should be performed periodically based on use of
sampler.
9.1.1 Meter Chamber Assembly
1.
Disconnect power.
2.
Open metering chamber by removing wing nuts and chamber cover.
3.
Clean volume control tube and level sensing probe with mild detergent.
Alternatively, exchange tube and probe with clean set. Do not use any
cleaner which may be harmful to the metering chamber cover. Do not use
solvents such as acetone, benzene, carbon tetrachloride or lacquer thinners.
Grease and oil may be removed with kerosene or aliphatic naphtha
(nonaromatic).
53
PVS5120-Series Portable Samplers
CAUTION
4.
Check and clean O-rings in metering chamber cover. Replace if damaged,
worn or brittle.
5.
Clean metering chamber using mild detergent.
Do not use any cleaner which may be harmful to the clear
A
acrylic (for example, petrochemical solvents, as noted
above). Do not use abrasives or “scouring” compounds.
6.
For composite systems, check discharge tubing for wear and replace as
necessary.
7.
Check pinch valve to ensure free movement.
8.
If possible, run sampler through several sampling sequences in clean
water.
9.1.2 Internal Battery (when included)
1.
Charge battery to full capacity when being stored for long periods and
disconnect fuse at battery.
2.
Recharge battery to full capacity before being deployed.
3.
Monitor battery voltage and recharge or swap out, at or before, 11.6 Vdc.
1.
Check for any obstructions at intake end and clean.
2.
Inspect for breaks, cracks, or any point where leakage may be suspected by
submerging in a bucket of water and run through a complete sampling
cycle. Watch for air bubbles during the purge cycle.
3.
Clean by completing several sampling sequences using mild detergent.
9.1.3 Intake Hose
CAUTION
Do not use any cleaner that may be harmful to the intake
A
hose material.
9.1.4 Testing System Vacuum
Using a pressure / vacuum gage, take a reading to ensure system has no leaks.
Optimal pressure is above 28 psi. Optimal vacuum should be 12 mm Hg or
higher. If the system is not performing at its peak, try the following:
54
1.
Check intake hose for leaks/kinks.
2.
Check discharge tube, ensure it has no leaks and is in good shape.
3.
Check all fittings to ensure they are tight.
4.
Make sure when tightening and loosening the brass gland nuts on the top
of the metering chamber cover that the bottom nut is held secure and does
PVS5120-Series Portable Samplers
not move on the cover. Ensure the top nut is securely tightened, by using
correct wrenches.
5.
If system is still not performing at its peak, inspect pump and all pump
tubing.
9.1.5 VSC100 Maintenance
The only maintenance for the controller is to replace its battery (see Appendix
E, Lithium Battery Replacement (p. E-1)).
9.2
Troubleshooting
9.2.1 Common Troubleshooting Scenarios
Symptom #1: Sampler does not pull a sample or purge while running:
•
Check all connections and intake line for loose fittings or plugged intake
hose. Tighten loose fittings and replace plugged intake hoses.
•
Verify that wing nuts and brass gland nuts on the meter chamber cover are
tightened and the cover is on correctly.
•
Spray dish soap/water mixture on metering chamber cover, blue intake
hose connection, 1/4 inch air tubing and then check for bubbles during the
purge cycle. Fix leaks by replacing hoses, tightening connections, and
replacing chamber cover.
•
Remove blue intake hose to metering chamber and place your thumb on
stainless steel intake tube; is there pressure or suction on it at any time
during the sampling process?
•
Check the pump and vacuum pressure. The maximum pump pressure
should be above 28 psi (on new pumps); vacuum pressure typically is
around 12 to 22 psi (on new pumps). The sampler only tries twice before
shutting down if a successful sample is not taken. Pump may need to be
rebuilt or replaced. This requires the following parts:
o
pn 28333 Sampler Replacement 12 Vdc Vacuum Pump
o
pn 28620 Service Repair Kit for sampler vacuum pump
o
pn 26895 brush and lead wire repair kit for sampler vacuum pump
Symptom #2: Sampler does not switch from vacuum to purge when contact is
made with the conductivity rod:
•
Clean volume control tube and conductivity rod.
•
Push and release the Manual Control button twice to induce a Manual
Sample. Short across the volume control tube and liquid
sensing/conductivity rod with screwdriver to switch sampler from vacuum
to purge simulating a successful sample. If it does not switch,
55
PVS5120-Series Portable Samplers
o
Check that the positive wire lead (yellow connector) is securely
attached to the top of the conductivity rod. Check for corrosion inside
of the yellow connector and on top of the conductivity rod. Clean if
needed.
o
If the yellow connector is securely attached, use a multimeter to see if
3.3 Vdc is present.
o
If 3.3 Vdc is not present, check for a broken wire and recheck the
yellow connector to ensure that it is not loose or broken.
Symptom #3: Sampler clock drifts outside of specification:
•
Connect to the computer and sync the clock by using the Clock tab in
DevConfig.
•
Apply setting and disconnect.
•
Power cycle the sampler.
•
Connect the sampler to the computer and check the clock to see if it has
drifted. If it has drifted, replace the coin cell battery (see Appendix E,
Lithium Battery Replacement (p. E-1)).
9.2.2 Information Needed for Help in Troubleshooting a Problem
Campbell Scientific application engineers need the following information to
help troubleshoot a problem:
9.3
•
Serial and model numbers (serial number indicates whether the sampler is
still under warranty)
•
Your PVS5120 sampler program
•
Symptoms: What is the sampler doing or not doing?
•
Whether the red LED on the front panel is lit
•
Whether the green LED on the front panel is lit
•
Equipment connected to the front panel (for example, external battery,
control cable, 12 Vdc charger)
•
Voltage of the battery supplying power to the sampler
Storage
If the sampler is not to be used for an extended period of time, store the unit in
an upright position in a warm, dry location. If the unit has an internal battery,
recharge the unit prior to storage and disconnect the yellow fuse caps on the
control section.
56
Appendix A. Sample Transport Velocity
TABLE A-1. Vertical Velocity at Sea Level
System
Size
Height
0m
(0 ft)
1.5 m
(5 ft)
3.1 m
(10 ft)
4.6 m
(15 ft)
5.5 m
(18 ft)
6.1 m
(20 ft)
6.7 m
(22 ft)
7.6 m
(25 ft)
8.2 m
(27 ft)
large
pump
2.16 m/s
(7.1 ft/s)
2.16 m/s
(7.1 ft/s)
1.83 m/s
(6 ft/s)
1.52 m/s
(5 ft/s)
1.34 m/s
(4.4 ft/s)
1.25 m/s
(4.1 ft/s)
1.10 m/s
(3.6 ft/s)
0.91 m/s
(3 ft/s)
0.79 m/s
(2.6 ft/s)
standard
pump
1.55 m/s
(5.1 ft/s)
1.43 m/s
(4.7 ft/s)
1.10 m/s
(3.6 ft/s)
0.82 m/s
(2.7 ft/s)
0.49 m/s
(1.6 ft/s)
0 m/s
(0 ft/s)
TABLE A-2. Horizontal Lift
Distance
System Size
7.6 m
(25 ft)
15.2 m
(50 ft)
22.9 m
(75 ft)
30.5 m
(100 ft)
53.3 m
(175 ft)
61 m
(200 ft)
76.2 m
(250 ft)
large pump
2.2 m/s
(7.1 ft/s)
1.9 m/s
(6.2 ft/s)
1.7 m/s
(5.6 ft/s)
1.5 m/s
(5 ft/s)
1.2 m/s
(4 ft/s)
1.1 m/s
(3.7 ft/s)
0.8 m/s
(2.6 ft/s)
standard pump
1.6 m/s
(5.1 ft/s)
1.4 m/s
(4.7 ft/s)
1.28 m/s
(4.2 ft/s)
1.25 m/s
(4.1 ft/s)
1 m/s
(3.4 ft/s)
0.9 m/s
(3.1 ft/s)
0.7 m/s
(2.3 ft/s)
0
50
8.0
Intake velocity (ft/s)
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
25
75
100
125
150
175
200
225
250
275
Hose length (ft)
1Samples
2 Vertical
were collected at sea level
head <2 ft
Standard Pump
Large Pump
A-1
Appendix A. Sample Transport Velocity
A-2
Appendix B. Example Programs
B.1 SDI-12 Example Programs
B.1.1 CR1000 SDI-12 Programs
B.1.1.1 CR1000 Program Controlling One Sampler
NOTE
During testing, it was helpful to include an Autorun parameter as
a Boolean variable. It allows the user to set the Autorun variable
to false in the Public table before opening up the sampler for
servicing without having to cut power to either the datalogger or
the sampler. Also the list of Responses includes a string message
for numeric response code (TABLE 8-3). This will allow a text
message to be returned to the user in the data table. The following
program is available for download from the PVS5120 webpages.
'VSC100 program with SDI-12 communication
'date: 2014/05/13
PreserveVariables
'Declare Public Variables
Public sdi12(4)
'This is the destination array for the output values from the sampler
Alias sdi12(1)= Bottle
Alias sdi12(2)= Smpl_count
Alias sdi12(3) = Response_Code
Alias sdi12(4) = Sampler_Volt 'this is the voltage of the sampler battery
Public SamplerAddr As String *1 'This is the sdi-12 address assigned to the sampler in DevConfig
Public Run As Boolean
Public Autorun As Boolean 'This variable allows the user to prevent the logger from triggering
'the sampler. It is helpful when servicing the sampler or testing in the lab. Just set the variable
'to false in the public table and sampling is stopped until the user sets the variable true.
'The following two variables are used to convert the numeric response code value from the sampler
'to a text message.
Dim Response_List(9) As String
Public response_code_message As String
'Define Data Tables
'Sdi-12 output from the sampler including bottle number, sample number in a given bottle,
'response code, and sampler voltage at the time of the sample)
DataTable (SamplerStat,1,1000)
Sample (1,Bottle,FP2)
Sample (1,Smpl_count,FP2)
Sample (1,Response_Code,FP2)
Sample (1,response_code_message, String)
Sample (1,Sampler_Volt,FP2)
EndTable
'Main Program
BeginProg
'Program startup values
SamplerAddr = "0" 'This is the sdi12 address assigned to the sampler.
Response_List(1)
Response_List(2)
Response_List(3)
Response_List(4)
Response_List(5)
Response_List(6)
Response_List(7)
Response_List(8)
Response_List(9)
=
=
=
=
=
=
=
=
=
It is set in DevConfig.
"No error"
"All samples complete"
"Low start battery (V<11.0 V)"
"Low run battery (V<10.5V)"
"Sampler vacuum timed out, no sample detected"
"Sample overflow detected"
"No sample liquid detected"
"Arm calibration error"
"Conductivity rod and Sample tube are shorted"
Autorun=true
B-1
Appendix B. Example Programs
'In this program the sampler is triggering via sdi12 once every 15 minutes. But the scan interval is set at
every 10 ‘sec assuming the logger is doing more than just triggering the sampler. This can be changed very
easily.
Scan (10,Sec,0,0)
If IfTime(0,15,Min)AND Autorun Then
Run=true
End If
If Run Then
'Values initialized to 999 to make communication errors easier to identify.
'For example if the logger is powered up but the sampler is turned off, NAN is returned for the
'first array location and 999s will remain in the remaining 3 array locations. This is repeated
'each time the logger tells the sampler to run.
sdi12(1)
sdi12(2)
sdi12(3)
sdi12(4)
=
=
=
=
999
999
999
999
SDI12Recorder (sdi12(),1,SamplerAddr,"M!",1.0,0) 'Run the Sampler
'In this example the sampler is wired into com port 1
response_code_message=Response_List(Response_Code+1)
Run=false
CallTable SamplerStat
EndIf
NextScan
EndProg
B.1.1.2 CR1000 Program for Running Three Samplers Concurrently
'VSC100 program for running 3 samplers concurrently via SDI-12.
'Once a C! command is issued the returned status values will not be available to the logger until the logger
tells the ‘samplers to run the next time. This is because a service command is not issued by the sensor with
a C! like in an ‘M! If you need data back sooner than the next sample follow the steps below.
'date 2014/10/17
Public PTemp, batt_volt
Public SamplerOne(4), SamplerTwo(4), SamplerThree(4) 'Returned Sampler status values for each sampler
Public CmdOne As String, CmdTwo As String, CmdThree As String
DataTable (SamplerStat,1,1000)
Sample (4,SamplerOne(),FP2)
Sample (4,SamplerTwo(),FP2)
Sample (4,SamplerThree(),FP2)
EndTable
BeginProg
Scan (5,Sec,0,0) 'scan interval every 5 seconds
PanelTemp (PTemp,250)
Battery (batt_volt)
If IfTime (0,2,Min) Then 'This example tells the samplers to run every 2 minutes
CmdOne = "C!"
CmdTwo = "C!"
CmdThree = "C!"
Else 'Else issue the "C" command every 5 seconds to get the status values when available
CmdOne = "C"
CmdTwo = "C"
CmdThree = "C"
EndIf
SDI12Recorder (SamplerOne,1,0,CmdOne,1.0,0) 'sampler address 0
SDI12Recorder (SamplerTwo,1,1,CmdTwo,1.0,0) 'sampler address 1
SDI12Recorder (SamplerThree,1,2,CmdThree,1.0,0) 'sampler address 2
'The following logic sets all 4 status values to NAN if the first one comes back as NAN when
'communication between the logger and sampler is interrupted.
If SamplerOne(1) >= 1E9 OR SamplerOne(1) = NAN Then Move (SamplerOne,4,NAN,1)
If SamplerTwo(1) >= 1E9 OR SamplerTwo(1) = NAN Then Move (SamplerTwo,4,NAN,1)
If SamplerThree(1) >= 1E9 OR SamplerThree(1) = NAN Then Move (SamplerThree,4,NAN,1)
CallTable SamplerStat
NextScan
EndProg
B-2
Appendix B. Example Programs
B.1.2 CR200X Series Programs
'This generic program for the CR200X triggers the PVS5120 based on a user-defined time interval.
'The VSC100 must be configured for SDI-12 control type and have an SDI-12 address of 0
'*** Change this value to the desired sample interval.
'Sample interval must be greater than or equal to two minutes unless you are using a very short hose.**
Const Sample_Interval = 2 ' Minutes. This is the sample interval
Public Run 'Set as a non-zero value in the public table for the sampler to begin sampling on the next scan
'interval. For example 0=Stop 1=sample.
Public BVolt 'This is the voltage of the CR200's power supply
Units BVolt = VDC
Public VSC100(4)'This is the destintation array for the output values from the VSC100
Alias VSC100(1) = Bottle_Number 'This is the bottle number that the last sample was deposited into
Alias VSC100(2) = Sample_Number 'This is the number of the last sample that was deposited into the current
bottle
Alias VSC100(3) = Response_Code 'This is the result code returned by the VSC100
'Possible response codes returned from VSC100
' 0 - No Error
' 1 - Sampler Full
' 2 - Low Sampler Start Battery
' 3 - Low Sampler Run Battery
' 4 - Vacuum Timeout
' 5 - Bottle Overflow (if detection probe installed)
' 6 - No Water Present (if water detection probe installed)
' 7 - Distributor Arm Calibration Failure
' 8 - Sample Sense Rod Shorted
Alias VSC100(4) = Sampler_Volt 'this is the voltage of the sampler battery
Units Sampler_Volt = VDC
Dim I 'This is a hidden variable used as an index counter
DataTable (Sampler_Data,True,-1)
DataInterval (0,Sample_Interval,min)
Sample (1,BVolt)
Sample (4,VSC100())
EndTable
BeginProg
Scan (Sample_Interval ,min)
Battery (BVolt) 'Measure the CR200's power supply
If Run <> 0 Then 'If the system has been enabled to run then
For I = 1 To 4'This loop sets all the elements in the VSC100 array to NAN.
easier to recognize errors.
VSC100(I) = NaN
Next I
SDI12Recorder (VSC100(),"0M!",1.0,0) 'Trigger the VSC100 to take a sample
This will make it
CallTable Sampler_Data
EndIf
NextScan
EndProg
B-3
Appendix B. Example Programs
B.2 PakBus® Example Programs
B.2.1 PakBus® Control CR1000 Program
NOTE
During testing, it was helpful to include an Autorun parameter as
a Boolean variable. It allows the user to set the Autorun variable
to false in the Public table before opening up the sampler for
servicing without having to cut power to either the datalogger or
the sampler. Also the list of Responses includes a string message
for numeric response code. This will allow a text message to be
returned to the user in the data table. The following program is
available for download from the PVS5120 webpages.
'PVS5120/VSC100 program communicating via PakBus
'hardware includes MD485
'this program also contains a Autorun variable that has to be true for the sampler to sample.
'If it is set to false it will disable the sampler until (for servicing...) it is set true again
'date: 2014-05-23
PreserveVariables
'Declare Public Variables
Public batt_volt 'storing datalogger battery voltage for quality control
Public sampler_PakBus_address 'The PakBus address is set or designated
'in DevConfig. The default value for the sampler is 95. If you have multiple samplers on the network they
each ‘need a unique PakBus address.
'The following two variables are used to convert the numeric response code value from the sampler to a text
'message.
Dim Response_List(9) As String
Public response_code_message As String
Public AutoRun As Boolean 'allows user to prevent the sampler from running on schedule via the connect screen
‘without removing power to the sampler or the logger
Public GetStatus As Boolean
Public Run_sampler As Boolean
Public Start_sample 'control variable ***Warning this CAN NOT be declared as a boolean even though you are
‘setting it true/false
Public Sampler_status(4)
'*** Status Values returned by the sampler once a sample is collected ****
Alias Sampler_status(1) = CurrentBottle 'Discrete distributor arm position
Alias Sampler_status(2) = SampleCount 'How many samples are currently in bottle
Alias Sampler_status(3) = ResponseCode 'Numeric Response Code
Alias Sampler_status(4) = SamplerBatt 'Sampler battery voltage (V)
'***Results returned for each communication instruction***
Public Result(3) 'does not have to be an array
'Define tables
DataTable (SamplerStat,True,1000) 'stores sampler status values
Sample (1,CurrentBottle,FP2)
Sample (1,SampleCount,FP2)
Sample (1,ResponseCode,FP2)
Sample (1,response_code_message,String)
Sample (1,SamplerBatt,FP2)
EndTable
DataTable (Errors,true,1000) 'stores the communication errors
Sample (3,Result(),FP2)
EndTable
DataTable (logger_battery,1,1000) 'stores the logger battery voltage for quality control in the case of
‘communication errors. It is only storing the 5 minute minimum reading but is measured on the scan interval
'in this case 10 seconds.
DataInterval (0,5,Min,10)
Minimum (1,batt_volt,FP2,0,False)
EndTable
B-4
Appendix B. Example Programs
'Main Program
BeginProg
'The following text is associated with the numeric response codes provided from the sampler after each
attempted ‘sample.
Response_List(1) = "No error"
Response_List(2) = "All samples complete"
Response_List(3) = "Low start battery (V<11.0 V)"
Response_List(4) = "Low run battery (V<10.5V)"
Response_List(5) = "Sampler vacuum timed out, no sample detected"
Response_List(6) = "Sample overflow detected"
Response_List(7) = "No sample liquid detected"
Response_List(8) = "Arm calibration error"
Response_List(9) = "Conductivity rod and Sample tube are shorted"
AutoRun=true 'initialize to True but the user can stop the sampler from sampling by changing it to false in
the ‘public table.
sampler_PakBus_address = 95 ‘This address must match the address assigned to the sampler in DevConfig
'Right now this sample program scans every 10 seconds and triggers the sampler once every 15 minutes
'Both the scan interval and the sampler time can be adjusted as needed.
Scan (10,Sec,0,0)
Battery (batt_volt)
CallTable logger_battery
If IfTime(0,15,Min) AND AutoRun Then 'If you are 0 seconds into the 15 minute and autorun is true
Run_sampler = true 'Then set "Run_sampler" flag to True
EndIf
If GetStatus Then 'if GetStatus is true then get variables from the sampler. If the communication fails
return
'the results to Result(1). "Public" is the sampler table name. "Start" is the field name on the
sampler.
GetVariables (Result(1),ComSDC7,0,sampler_PakBus_address,0000,0,"Public","Start",Start_sample,1)
If Start_sample <> True AND Result(1)=0 Then 'If Start_sample is not True and Result(1)=0 then get
sampler ‘status
GetVariables
(Result(3),ComSDC7,0,sampler_PakBus_address,0000,0,"Public","Bottle",Sampler_status(1),4)
response_code_message = Response_List(ResponseCode+1)
CallTable SamplerStat 'send the current status values to the SamplerStatus table
GetStatus=false
ElseIf Result(1)<> 0 OR Result(3) <> 0 Then 'Else if there either result(1) or result(3) does not equal
zero than
'call the communcation error table.
CallTable Errors
EndIf
EndIf
If Run_sampler Then 'If Run_sampler is true send the start instruction to the sampler
Start_sample = true
SendVariables (Result(2),ComSDC7,0,sampler_PakBus_address,0000,0,"Public","Start",Start_sample,1)
If Result(2)<>0 Then 'If result(2) does not equal 0 call the communication error table.
CallTable Errors
Else 'set GetStatus to true so on the next scan the logger knows to ask for the updated sampler_status
GetStatus = true
EndIf 'reset run_sampler to false so the logger waits until the top of the next sample interval
'in this case 0 seconds into the next 15 minute interval to sample.
Run_sampler = false
EndIf
NextScan
EndProg
B-5
Appendix B. Example Programs
B.3 Modbus® Example Programs
B.3.1 CR1000 Modbus® Control Program
NOTE
During testing, it was helpful to include an Autorun parameter as
a Boolean variable. It allows the user to set the Autorun variable
to false in the Public table before opening up the sampler for
servicing without having to cut power to either the datalogger or
the sampler. Also the list of Responses includes a string message
for numeric response code (TABLE 8-3). This will allow a text
message to be returned to the user in the data table. The following
program is available for download from the PVS5120 webpages.
'PVS5120/VSC100 program communicating via ModBus
'hardware includes MD485
'Important to remember to first configure the MD485
'then configure the sampler via devconfig
'then service the sampler so the arm is in the correct location and bottles are empty
'then load the program to the datalogger.
'this program also contains a Autorun variable that has to be true for the sampler to sample.
'If it is set to false it will disable the sampler until (for servicing...) it is set true again
'date: 2015-05-04
PreserveVariables
'Declare Public Variables
Public batt_volt 'storing datalogger battery voltage for quality control
Public MBAddress 'Modbus Address of the sampler as set in devconfig.
'The following two variables are used to convert the numeric response code value from the sampler
'to a text message.
Dim Response_List(9) As String
Public response_code_message As String
Public AutoRun As Boolean 'allows the user to prevent the sampler from running on schedule
'via the connect screen without removing power to the sampler or the logger
Public GetStatus As Boolean
Public Run_sampler As Boolean
Public Start_sample As Boolean 'control variable
Public Sampler_status(4)
'*** Status Values returned by the sampler once a sample is collected ****
Alias Sampler_status(1) = CurrentBottle 'Discrete distributor arm position
Alias Sampler_status(2) = SampleCount 'How many samples are currently in bottle
Alias Sampler_status(3) = ResponseCode 'Numeric response code
Alias Sampler_status(4) = SamplerBatt 'Sampler battery voltage (V)
Public MbResult(3)'need a result variable for every modbus instruction
'does not need to be an array
'will increment greater than zero to let you know if a communication does not occur
'in this program MbResult1 error code occurs when communication is lost during any scan interval
'in this program it will increment every 10 secs that communcation is lost.
'MbResult2 error code occurs when the initiate sample command can not be sent to the sampler because
'communications are down. It will increment every 15 minutes.
'Define tables
DataTable (SamplerStat,True,-1) 'stores sampler status values
Sample (1,CurrentBottle,FP2)
Sample (1,SampleCount,FP2)
Sample (1,ResponseCode,FP2)
Sample (1,response_code_message,String)
Sample (1,SamplerBatt,FP2)
EndTable
DataTable (ModbusErrors,true,-1) 'stores the modbus errors
Sample (3,MbResult(),FP2)
EndTable
B-6
Appendix B. Example Programs
DataTable (logger_battery,1,1000) 'stores the logger battery voltage for
'quality control in the case of communication errors. It is only storing
'the 5 minute minumim reading but will be measured on the scan interval
'in this case 10 seconds.
DataInterval (0,15,Min,10)
Minimum (1,batt_volt,FP2,0,False)
EndTable
'Main Program
BeginProg
'The following text is associated with the numeric response codes provided
'from the sampler after each attempted sample.
Response_List(1) = "No error"
Response_List(2) = "All samples complete"
Response_List(3) = "Low start battery (V<11.0 V)"
Response_List(4) = "Low run battery (V<10.5V)"
Response_List(5) = "Sampler vaccuum timed out, no sample detected"
Response_List(6) = "Sample overflow detected"
Response_List(7) = "No sample liquid detected"
Response_List(8) = "Arm calibration error"
Response_List(9) = "Conductivity rod and Sample tube are shorted"
MBAddress = 0 'This must also be set in Devconfig for each sampler. The address
'must be unique if you are using multiple samplers.
AutoRun=true 'initialize to True but the user can stop the sampler from sampling
'by changing it to false in the public table.
'Right now this sample program scans every 10 seconds and triggers the sampler once every 15 minutes
'Both the scan interval and the sampler time can be adjusted as needed.
Scan (10,Sec,0,0)
Battery (batt_volt)
CallTable logger_battery
If IfTime(0,15,Min) AND AutoRun=true Then 'If you are 0 seconds into the 15 minute interval and autorun is true
Run_sampler = true 'Then set "Run_sampler" flag to True
EndIf
If GetStatus=true Then 'if GetStatus is true then read control variable from the sampler (modbus device)
ModbusMaster (MbResult(1),ComSDC7,38400,MBAddress,1,Start_sample,1,1,3,100,0)
If Start_sample <> True AND MbResult(1)=0 Then 'if start_sample is NOT true and MbResult(1) = 0 then
'get the sampler status values
ModbusMaster (MbResult(3),ComSDC7,38400,MBAddress,3,Sampler_status(),23,4,3,100,0)'reading actual status values
response_code_message = Response_List(ResponseCode+1)'adjust the numeric response code the to assigned message
CallTable SamplerStat 'send the sampler status to the table
GetStatus=false
ElseIf MbResult(1)<> 0 OR MbResult(3) <> 0 Then 'else if MbResult (1) or (3) does NOT = 0 then write to
'the error table
CallTable ModbusErrors
EndIf
EndIf
If Run_sampler Then 'if Run_sampler is True then set the control variable true and set the start flag in the sampler
Start_sample = true
ModbusMaster (MbResult(2),ComSDC7,38400,MBAddress,15,Start_sample,1,1,3,100,0) 'Function 15 is setting
'the flag in the sampler
If MbResult(2)<>0 Then 'if there was an error in communicating with the sampler write to the error table
CallTable ModbusErrors
Else
GetStatus = true 'set getstatus true so on the next scan the logger knows to ask for the
'sampler_status values of the new sample.
EndIf
Run_sampler = false
EndIf
NextScan
EndProg
B-7
Appendix B. Example Programs
B-8
Appendix C. Monitoring Sampler Status
via RS-485
When controlling a sampler via time-based/stand-alone or pulse control, it is
possible to still collect the sampler status values over RS-485 (PakBus® or
Modbus®). The following sections walk through configuring the MD485 to
talk with a CR1000 and then programming examples for Modbus® and
PakBus® in CRBasic.
C.1 Configuring an MD485
1.
Connect a serial cable to the RS-232 port on the MD485 and to the
computer.
2.
Supply power (12 Vdc) to the MD485 by the power jack or through the
+12 V line on the CS I/O connector. You will need a SC12 serial cable to
connect the CS I/O port of the MD485 to the CS I/O port on the
datalogger.
3.
Open DevConfig. Click Peripheral. Select MD485. Select the
Communication Port. Push the Program button on the MD485. Click
Connect. The program button is located to the right of the RS-485
connectors on the modem’s front panel.
FIGURE C-1. MD485 Device Configuration screen
C-1
Appendix C. Monitoring Sampler Status via RS-485
4.
Click the MD485 tab. Select CS I/O and RS-485 in the Active Ports box.
Select Transparent Communication in the Protocol Configuration box
(FIGURE C-2).
FIGURE C-2. MD485 Deployment tab
5.
Click the CS I/O tab. Set the mode based on the type of datalogger being
used.
a.
6.
The shown configuration is for a CR1000. We used SDC7 for the
address.
Click the RS-485 tab. Set Baud Rate to 38.4k. Set Parity to None. Set
Character Length to 8 bits. Set Stop Bits to 1 bit (FIGURE C-3).
FIGURE C-3. MD485 RS-485 tab
7.
C-2
Click Apply.
Appendix C. Monitoring Sampler Status via RS-485
C.2 Wiring for Status Monitoring via RS-485
TABLE C-1. Status Monitoring Connections (PVS5120CBL-L Cable)
Wire
Description
Connection
Green
SDI-12/Pulse Out
PLC or datalogger control port
Blue
Pulse Start
External device 0 to 5 V TTL
Purple
Ground
External device ground
Gray
Ground
Optional water detection probe
Yellow
Water Sensor
Optional water detection probe
White
RS-485 A-
MD485 RS-485 A port
Black
RS-485 B+
MD485 RS-485 B port
Red
Fault
Not used
Brown
RG
MD485 RG port
C.3 Configure the VSC100
Reconnect to the VSC100 to add/adjust either the PakBus® or Modbus®
address depending on how you want to monitor the sampler status.
C.3.1 Connecting to the VSC100/Sampler via DevConfig
1.
Connect the 17648 USB cable to the front of the sampler controller
(VSC100) and the other end to the computer’s USB port (FIGURE 8-3).
Wait for Windows® to install the driver before opening DevConfig.
2.
Open DevConfig. Select VSC100 Series under the Sampler. Click
Communication Port and select the correct COM port. Click Connect
(FIGURE C-4).
C-3
Appendix C. Monitoring Sampler Status via RS-485
FIGURE C-4. Device Configuration VSC100
3.
Once connected to the VSC100, you are ready to configure your sampler.
4.
Click the Sampler Settings tab.
a.
C-4
Set the PakBus® address or the Modbus® Address
i.
The default PakBus® address for the sampler is 95. This value
needs to be unique for each sampler and datalogger on your
network.
ii.
The default Modbus® address is 1. The value can range from 1
to 127. Each sampler on your network will need a unique
address.
5.
You do not need to change any of your time-based or pulse control
settings.
6.
Click Apply. It is a good idea to save the configuration file for
troubleshooting.
Appendix C. Monitoring Sampler Status via RS-485
C.4 Programming for RS-485 Monitoring
C.4.1 Monitoring via PakBus®
When monitoring via PakBus® you will need to issue the GetVariables()
instruction and save the returned values to variable array. Below is the
instruction’s structure and an example instruction. Also a CR1000 program is
available.
GetVariables(ResultCode, ComPort, NeighborAddr, PakBusAddr, Security,
TimeOut, “TableName”, “FieldName”, Variable, Swath)
GetVariables(Result(3),ComSDC7,0,sampler_PakBus_address,0000,0,
"Public","Bottle",Sampler_status(1),4)
See Section 8.2.4, PakBus® Control (p. 36), for more explanation of the
GetVariables instruction or the CRBasic Help.
C.4.1.1 CR1000 Program for PakBus® Monitoring with Time-Based
Configuration
'PVS5120/VSC100 program communicating via PakBus
'hardware includes MD485
'program monitors the status of a sampler running on a time-based configuration via PakBus.
'date: 2014-10-21
PreserveVariables
'Declare Public Variables
Public sampler_PakBus_address 'The PakBus address is set or designated
'in DevConfig. The default value for the sampler is 95. If you have
'multiple samplers on the network they each need a unique PakBus address.
'The following two variables are used to convert the numeric response code value from the sampler
'to a text message.
Dim Response_List(9) As String
Public response_code_message As String
Public Sampler_status(4)
'*** Status Values returned by the sampler once a sample is collected ****
Alias Sampler_status(1) = CurrentBottle 'Discrete distrubitor arm position
Alias Sampler_status(2) = SampleCount 'How many samples are currently in bottle
Alias Sampler_status(3) = ResponseCode 'Numeric Response Code
Alias Sampler_status(4) = SamplerBatt 'Sampler battery voltage (V)
'***Results returned for each communication instruction***
Public Result
'Define tables
DataTable (SamplerStat,True,1000) 'stores sampler status values
Sample (1,CurrentBottle,FP2)
Sample (1,SampleCount,FP2)
Sample (1,ResponseCode,FP2)
Sample (1,response_code_message,String)
Sample (1,SamplerBatt,FP2)
EndTable
DataTable (Errors,true,1000) 'stores the communication errors
Sample (1,Result,FP2)
EndTable
'Main Program
BeginProg
'The following text is associated with the numeric response codes provided
'from the sampler after each attempted sample.
Response_List(1) = "No error"
Response_List(2) = "All samples complete"
Response_List(3) = "Low start battery (V<11.0 V)"
Response_List(4) = "Low run battery (V<10.5V)"
C-5
Appendix C. Monitoring Sampler Status via RS-485
Response_List(5)
Response_List(6)
Response_List(7)
Response_List(8)
Response_List(9)
=
=
=
=
=
"Sampler vacuum timed out, no sample detected"
"Sample overflow detected"
"No sample liquid detected"
"Arm calibration error"
"Conductivity rod and Sample tube are shorted"
sampler_PakBus_address = 95
'Right now this sample program scans every 10 seconds and triggers the sampler once a minute
'zero seconds into the minute. Both the scan interval and the sampler time can be adjusted as needed.
Scan (30,Sec,0,0)
GetVariables (Result,ComSDC7,0,sampler_PakBus_address,0000,0,"Public","Bottle",Sampler_status(1),4)
response_code_message = Response_List(ResponseCode+1)
CallTable SamplerStat 'send the current status values to the SamplerStatus table
If Result<> 0 Then
'call the communcation error table.
CallTable Errors
EndIf
NextScanEndProg
C.4.2 Monitoring via Modbus®
When monitoring via Modbus®, you need to issue the ModbusMaster()
instruction and save the returned values to variable array. These status values
are array values 23 through 29 in TABLE 8-7. Below is the instruction’s
structure and an example instruction. Also a CR1000 program is available.
The ModbusMaster() instruction initiates a sample and collects the returned
status values. This instruction accesses the Coils and Input Registers stored in
the VSC100 controller. TABLE 8-7 provides the name and description of the
RS-485 coils or registers stored in the VSC100 Public Table.
The settings/options chosen within the instruction depend on whether you are
triggering a sample, checking to see if it is done sampling, or asking for the
status values.
ModbusMaster(ResultCode, ComPort, BaudRate, ModbusAddr, Function,
Variable, Start, Length, Tries, TimeOut, [ModbusOption])
This instruction collects the status values:
ModbusMaster(MbResult(3),ComSDC7,38400,MBAddress,3,Sampler_status(),
23,4,3,100,0)
C-6
Appendix C. Monitoring Sampler Status via RS-485
C.4.2.1 Modbus® Monitoring with Time-Based Configuration
'PVS5120/VSC100 program communicating via Modbus
'hardware includes MD485
'date: 2014-10-21
PreserveVariables
'Declare Public Variables
'The following two variables are used to convert the numeric error code value from the sampler
'to a text message.
Dim Response_List(9) As String
Public response_code_message As String
Public GetStatus As Boolean
Public MBAddress
Public Sampler_status(4)
'*** Status Values returned by the sampler once a sample is collected ****
Alias Sampler_status(1) = CurrentBottle 'Discrete distrubitor arm position
Alias Sampler_status(2) = SampleCount 'How many samples are currently in bottle
Alias Sampler_status(3) = ResponseCode 'Numeric response code
Alias Sampler_status(4) = SamplerBatt 'Sampler battery voltage (V)
Public MbResult'need a result variable for every Modbus instruction
'increment greater than zero to let you know if a communication does not occur
'Define tables
DataTable (SamplerStatus,True,-1) 'stores sampler status values
Sample (1,CurrentBottle,FP2)
Sample (1,SampleCount,FP2)
Sample (1,ResponseCode,FP2)
Sample (1,response_code_message,String)
Sample (1,SamplerBatt,FP2)
EndTable
DataTable (ModbusErrors,true,-1) 'stores the Modbus errors
Sample (1,MbResult,FP2)
EndTable
'Main Program
BeginProg
'The following text is associated with the numeric response codes provided
'from the sampler after each attempted sample.
Response_List(1) = "No error"
Response_List(2) = "All samples complete"
Response_List(3) = "Low start battery (V<11.0 V)"
Response_List(4) = "Low run battery (V<10.5V)"
Response_List(5) = "Sampler vacuum timed out, no sample detected"
Response_List(6) = "Sample overflow detected"
Response_List(7) = "No sample liquid detected"
Response_List(8) = "Arm calibration error"
Response_List(9) = "Conductivity rod and Sample tube are shorted"
MBAddress = 1'This must also be set in DevConfig for each sampler.
‘using multiple samplers.
The address must be unique if you are
Scan (30,Sec,0,0)
ModbusMaster (MbResult,ComSDC7,38400,MBAddress,3,Sampler_status(),23,4,3,100,0)
'reading actual status values
response_code_message = Response_List(ResponseCode+1)
'adjust the numeric response code the to assigned message
CallTable SamplerStatus
'send the sampler status to the table
NextScan
EndProg
C-7
Appendix C. Monitoring Sampler Status via RS-485
C-8
Appendix D. Replacement Parts
TABLE D-1. Replacement Parts
Part Number
Description
15598
3V coin cell lithium battery CR2016
26895
Pump brush and wire repair kit
26896
9L nalgene bottle w.center plug
26898
3/8 in ID 3ft latex discharge tube
26899
3/8 in ID 3 ft silicone dischrge tube
26905
0.5 L pyrex meter chamber, 3/8 in system
26906
0.5 L acrylic meter chanber, 3/8 in system
26914
3/8 in system stainless steel sinker/strainer
26915
3/8 in system lead sinker
26925-L-
Sampler 3/8 inch PVC intake hose
27166
3/8 in ID PVC blue intake hose
27822
9 L bottle with base
27823
7 Ah battery with mount
27825
External 12 Vdc charger, 4 pin
27891
Pinch valve solenoid 12 Vdc
27949
3/8 in system 25 ft intake tubing w/lead sinker
27952
0.5 L polypropylene wedge bottle
27953
1 L polypropylene wedge bottle
27954
9 L bottle, Nalgene HDPE
27955
20 L bottle, Nalgene HDPE
27956
10 L (2.5 G) glass bottle w/Teflon® cap
27957
1 L glass bottle w/Teflon® cap
27969
Hose clamp (for sampler end)
27997
Quick connect stainless steel body
27998
1/2 in quick connect stainless steel stem
28009
Large pump
28251
5/8 in silicone discharge tubing 1/16 in wall
28258
20 L (5.3 gal) Nalgene PP bottle
28287
Sampler 3/8 inch Teflon® distributor assembly
28296
Sampler 3/8 inch PVC distributor assembly
28333
12 Vdc, 1.4 CFM vacuum pump w/label
D-1
Appendix D. Replacement Parts
D-2
28439
24-position stepper motor
29735
100 to 240 Vac charger
29786
Standard pump
30144-L
PVS5120C/D water detection probe
30819
PVS5120 external battery cable, 6ft
30991
PVS5120 short volume control tube
PVS5120CBL-L
PVS5120 control cable
VSC100
Sampler controller
Appendix E. Lithium Battery
Replacement
1.
Remove the four Phillips screws from the VSC100 and separate top from
bottom.
Phillips
screws
2.
Disconnect the 16-pin connector from bottom of the VSC100.
16 pin connector
3.
Remove the eight Phillips screws from the bottom of the VSC100 and
separate top from bottom. Use Loctite on the four outer screws on
reassembly. (Phillips screws are circled below).
E-1
Appendix E. Lithium Battery Replacement
4.
Remove these four Phillips screws from inside the VSC100.
Phillips screws
5.
CAUTION
Lift board out carefully and turn over. Be careful not to tear the wires
connecting the board to the USB connector.
When lifting the board, do not tear the wires that connect the
board to the USB connector.
Wires connecting
USB connector
6.
Replace with lithium battery, pn 15598 Lithium battery 3 V Coin Cell
(CR2016).
Replacement 3 V
lithium battery
(pn 15598)
E-2
Appendix F. Response Code 4
Scenarios
A vacuum time out error (response code 4) is returned to the user as part of the
sampler status values when the necessary volume of water does not enter the
metering chamber and complete the circuit between the volume control tube
and liquid sensing/conductivity rod. In other words, there is not enough water
to complete the sample as the sampler is configured (volume depends on the
setting of the volume control tube and conductivity rods).
As discussed in earlier sections, it is important to have at least half an inch
height separation between the bottom of the volume control tube and the
bottom of the conductivity rod. This offset is necessary because of the
turbulent flow conditions as the sample enters the metering chamber. If the
water supply’s level varies and the water supply could dry up, we highly
recommend using a water detection probe to check if enough water is available
for the sample. Also, it may be necessary to increase the height difference
between the bottoms of the two tubes in the metering chamber to more than an
inch. The increased offset is necessary because the water is shot into the
chamber under pressure as the sampler tries to vacuum up enough water to
complete the circuit causing the water surface to jump.
Also, it is possible to overfill a bottle when a vacuum time out error occurs.
See the scenario below.
Example 1: PVS5120D with 24 bottles and 25 ft of intake hose. It keeps 150
mL for each sample (bottom of the volume control tube is set at 150 mL within
the metering chamber). Three samples are stored in each sample bottle for a
total volume of 450 mL. The conductivity rod is set at 500 mL.
In this example, the sampler purges for 15 s. It then starts vacuuming the
sample into the hose and metering chamber until it touches the conductivity rod
(at the 500 mL line). Next the sampler purges the volume from 500 mL down
to 150 mL, drops the 150 mL into the sample bottle and then purges the rest of
the hose for 15 s.
The following status values are returned to the user in sampler attempt 1.
TABLE F-1. Status Value
Sample Attempt
Status Value
1
2
3
4
Bottle #
1
1
1
1
Sample #
1
1
2
3
Response Code
0
4
0
0
Volume stored (mL)
150
≤150
150
150
Response Code 0 = Successful Sample; Response Code 4 = Vacuum Time Out
Error
F-1
Appendix F. Response Code 4 Scenarios
On Sample Attempt 2, the sampler attempts to collect the 500 mL to close the
circuit for two times the purge time. The sampler tries to collect 500 mL for
30 s. If enough liquid is still not available, the sampler purges to the level of
the volume control tube (in this case 150 mL), and drops the sample into the
bottle and returns a response code 4. The sample count does not increment
because the sampler does not believe enough water entered the chamber to
count as a successful sample. So the volume stored in the bottle for attempt #2
could be anywhere between 0 to 150 mL.
Sample Attempt 3 occurs whenever the next run condition is met (time interval
or flow interval). Water enters the chamber, completes the circuit, and 150 mL
are dropped into bottle one. A response code 0 is returned the sample count is
incremented. Sample Attempt 4 is completed and the distributor arm will then
advance to bottle 2.
When you go to the field and open up the sampler, bottle 1 can be between 450
to 600 mL; therefore, up to 100 mL are in the base of the sampler. Notice the
total volume that was collected during the successful samples compared to
what was actually deposited in the sample bottle. Since the conductivity rod is
set at 500 mL, a total of 1500 mL was collected when the desired total amount
was only 450 mL.
Example 2: Everything stays the same, but we lower the conductivity rod to
just below the 300 mL line of the metering chamber. This lowers the bottom of
the rod by roughly 3 inches. By lowering the rod, we may be able to
completely prevent the vacuum time out errors because less water is necessary
to complete the circuit.
Conclusion: It is important to balance the difference in rod height between
turbulent flow and amount of volume collected. If you know your water source
could go dry, the best plan is to use the water detection probe to check for
enough water to collect a sample. Also, in the case of low water supply,
consider how low the conductivity rod can be set and the length of your intake
hose. Because the longer the hose and the higher the conductivity rod is set, a
larger water volume is necessary for a successful sample regardless of how
much water is actually deposited in a sample bottle.
F-2
Appendix G. Generic Modbus® Control
TABLE G-1. Detailed Modbus® Control Information
TABLE G-1 provides detailed Modbus® control information.
G-1
Appendix G. Generic Modbus® Control
TABLE G-2. Simplified Modbus® Control
Modbus Ctl
Start
Serviced
Auto Deploy
Timed Ctl
Start
Serviced
Auto Deploy
Pulse Ctl
Start
Serviced
Auto Deploy
CRBasic ModbusMaster()
Function Start Length
1 or 15
1
1
1 or 15
2
1
1 or 15
3
1
Coil
00001
00002
00003
Register
Bottles
Bottles
Bottles
40001 & 40002
3 or 16
1
SampPerBottle
SampPerBottle
SampPerBottle
40003 & 40004
3 or 16
3
NeverFull
NeverFull
NeverFull
40005 & 40006
3 or 16
5
PurgeTime1
StartHours
PurgeTime1
40007 & 40008
3 or 16
7
LevelSetTime
StartMins
LevelSetTime
40009 & 40010
3 or 16
9
DepositTime
StartSecs
DepositTime
40011 & 40012
3 or 16
11
PurgeTime2
StartDay
PurgeTime2
40013 & 40014
3 or 16
13
UsePurgeTime2
StartMonth
UsePurgeTime2
40015 & 40016
3 or 16
15
SetTimeOut
StartYear
StartPulses
40017 & 40018
3 or 16
17
TimeOut
IntHrs
UseNegPulse
40019 & 40020
3 or 16
19
SamplerType
IntMins
TotalPulses
40021 & 40022
3 or 16
21
Bottle
Bottle
Bottle
40023 & 40024
3
23
Samples
Samples
Samples
40025 & 40026
3
25
Response
Response
Response
40027 & 40028
3
27
Batt
Batt
Batt
40029 & 40030
3
29
*Registers 40001 to 40030 contain 15 values encoded as IEEE 754, 4-byte floating point (CDAB)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Some Modbus® clients (masters) require the start address to be specified as
base 1 while others require as base 0. For base 1 devices, set your starting
address to the Register Number; for example, use a start of 23 when querying
Bottle. For base 0 devices, set your starting address to the Register Address;
for example, use a start of 22 when querying Bottle. Campbell Scientific
dataloggers require the start to be specified as the Register Number.
All values contained in the registers are IEEE 754, 4-byte floating point
numbers. This means that the values occupy two registers each, with each
register holding 2 bytes. Data is transmitted with a swapped word order. This
means that the low order word is transmitted on the wire first, followed by the
high order word. The words (registers) use a big endian architecture. A
common notation for this byte arrangement is “CDAB” where “CD” is the loworder word and “AB” is the high-order word.
Modbus Packet Example 1: Set "Start" Coil = ON
TX: 01 05 00 00 FF 00 {CRC}
RX: 01 05 00 00 FF 00 {CRC}
Modbus Packet Example 2: Read "Start" Coil
TX: 01 01 00 00 00 01 {CRC}
RX: 01 01 01 01 {CRC}, if "Start" coil is true, bit 0 = 1
or
RX: 01 01 01 00 {CRC}, if "Start" coil is false, bit 0 = 0
G-2
Appendix G. Generic Modbus® Control
Modbus Packet Example 3: Set "SampPerBottle" Registers = 24.0 (0x 41 C0
00 00)
TX: 01 10 00 02 00 00 41 C0 {CRC}
RX: 01 10 00 02 00 02 {CRC}
Modbus Packet Example 3: Set "SampPerBottle" Registers = 24.0 (0x 41 C0
00 00)
TX: 01 10 00 02 00 00 41 C0 {CRC}
RX: 01 10 00 02 00 02 {CRC}
Modbus Packet Example 4: Get "Bottle", "Sample", "Response", and "Batt"
Registers
TX: 01 04 00 16 00 08 {CRC}
RX: 01 04 10 00003F80 00003F80 00000000 00004148 {CRC}
G-3
Appendix G. Generic Modbus® Control
G-4
Appendix H. ISO5667 Conformity
The Campbell Scientific, Inc. Portable Vacuum Sampler 5120 (PVS5120)
complies with the relevant sections of the ISO 5667-10 standard applicable to
unrefrigerated portable water samplers. Individual statements from section
4.2.2 – Automatic Sampling Equipment are addressed below.
a.
“Time-weighted composite samples”
Possible with the PVS5120C.
b.
“Discrete samples taken at fixed intervals, held in individual
containers”
c.
“Succession of short period composite samples being held in
individual containers”
Both of these are possible with the PVS5120D.
d.
“Flow-weighted composite samples, i.e. taking variable volumes of
sample depending on stream flow for a fixed period of time”
This can NOT be done. The CSI sampler collects the same
volume every time it samples.
e.
“Flow-weighted samples held in individual bottles”
PVS5120 can do this if a flow meter is connected to the sampler
or the datalogger. You would collect a sample every X volume of
water that passes the sampler. The sample will be the same
volume every time.
f.
“Ability of the sampler to lift samples through the required height for
any chosen situation”
Pump
Maximum lift in meters at sea level (ft)
Standard
4.9 (16)
Large
8.2 (27)
These values are dependent on age of the pump, vacuum seals,
and battery condition. But for a new sampler/pump, the
standards should be met.
k.
“The sampling line from intake point to sample delivery point should
have a minimum internal diameter of 9 mm to minimize clogging of
the uptake line.”
Both the PVS5120C and D have an intake tube with an inner
diameter of 9.5 mm (0.375 in). The volume control tube has an
inner diameter of 10.9 mm (0.430 in).
H-1
Appendix H. ISO5667 Conformity
l.
“The intake liquid velocity should be a minimum of 0.5 m/s in order
to prevent phase separation in the sampling line and measuring
chamber.”
TABLE A-1. Vertical Velocity at Sea Level
System
Size
Height
0m
(0 ft)
1.5 m
(5 ft)
3.1 m
(10 ft)
4.6 m
(15 ft)
5.5 m
(18 ft)
6.1 m
(20 ft)
6.7 m
(22 ft)
7.6 m
(25 ft)
8.2 m
(27 ft)
large
pump
2.16 m/s
(7.1 ft/s)
2.16 m/s
(7.1 ft/s)
1.83 m/s
(6 ft/s)
1.52 m/s
(5 ft/s)
1.34 m/s
(4.4 ft/s)
1.25 m/s
(4.1 ft/s)
1.10 m/s
(3.6 ft/s)
0.91 m/s
(3 ft/s)
0.79 m/s
(2.6 ft/s)
standard
pump
1.55 m/s
(5.1 ft/s)
1.43 m/s
(4.7 ft/s)
1.10 m/s
(3.6 ft/s)
0.82 m/s
(2.7 ft/s)
0.49 m/s
(1.6 ft/s)
0 m/s
(0 ft/s)
TABLE A-2. Horizontal Lift
Distance
System Size
7.6 m
(25 ft)
15.2 m
(50 ft)
22.9 m
(75 ft)
30.5 m
(100 ft)
53.3 m
(175 ft)
61 m
(200 ft)
76.2 m
(250 ft)
large pump
2.2 m/s
(7.1 ft/s)
1.9 m/s
(6.2 ft/s)
1.7 m/s
(5.6 ft/s)
1.5 m/s
(5 ft/s)
1.2 m/s
(4 ft/s)
1.1 m/s
(3.7 ft/s)
0.8 m/s
(2.6 ft/s)
standard pump
1.6 m/s
(5.1 ft/s)
1.4 m/s
(4.7 ft/s)
1.28 m/s
(4.2 ft/s)
1.25 m/s
(4.1 ft/s)
1 m/s
(3.4 ft/s)
0.9 m/s
(3.1 ft/s)
0.7 m/s
(2.3 ft/s)
m.
H-2
“Ability to purge sampling lines to receive fresh sample.”
Appendix H. ISO5667 Conformity
n.
“The precision and accuracy of delivered volumes should be at least
5% of the intended volume.”
The amount of water taken is set mechanically using the liquid
sensing rod and the volume control tube, which means sample
accuracy is precise every time, usually within ±2% or ±2 mL.
Sample accuracy increases when you have set the volume control
rod and tested the collected sample at setup.
H-3
Appendix H. ISO5667 Conformity
H-4
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