PRODUCT MANUAL
TD-Diver™ & Baro-Diver® – DI8xx Series
Contact details:
Van Essen Instruments B.V.
Van Essen Instruments - Canada
Delftechpark 20
630 Riverbend Drive, Suite 100
2628 XH Delft
Kitchener, ON,
The Netherlands
Canada N2K 3S2
Phone: +31 15 275 5000
Phone: +1 226-791-6499
Internet: www.vanessen.com
Support: diver@vanessen.com
Copyright © 2017 by Van Essen Instruments B.V. All rights reserved. This document contains
proprietary information which is protected by copyright. No part of this document may be
photocopied, reproduced, or translated to another language without the prior written consent of Van
Essen Instruments B.V.
Van Essen Instruments B.V. makes no warranty of any kind with regard to this material, including, but
not limited to, its fitness for a particular application. Van Essen Instruments B.V. will not be liable for
errors contained herein or for incidental or consequential damages in connection with the furnishing,
performance, or use of this material. In no event shall Van Essen Instruments B.V. be liable for any
claim for direct, incidental, or consequential damages arising out of, or in connection with, the sale,
manufacture, delivery, or use of any product. Van Essen Instruments and the Van Essen Instruments
logo, Diver are trademarks or registered trademarks Van Essen Instruments B.V.
Viton is a registered trademark of DuPont Dow Elastomers.
The presence of the Waste Electrical and Electronic Equipment (WEEE) marking on the product
indicates that the device is not to be disposed via the municipal waste collection system of any
member state of the European Union. For products under the requirement of WEEE directive
(2012/19/EU), please contact your distributor or local Van Essen Instruments B.V. office for the proper
decontamination information and take back program, which will facilitate the proper collection,
treatment, recovery, recycling, and safe disposal of the device.
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CE COMPLIANCE STATEMENT (EUROPE)
We hereby declare that the device(s) described below are in conformity with the directives listed. In
the event of unauthorized modification of any devices listed below, this declaration becomes invalid.
Type:
Datalogger
Product Model: TD-Diver (DI801, DI802, DI805, DI810), Baro-Diver (DI800)
Relevant EC Directives and Harmonized Standards:
1999/5/EC R&TTE Directive for Radio and Telecommunications Terminal Equipment in accordance to
annex III to which this directive conform to the following standards:
Low Voltage Directive per EN60950-1 (2006)+A11 (2011) for Product Safety testing
standard for "Information Technology Equipment"
EMC Directive EN 301 489-1 V1.8.1 / EN 301 489-17 V1.3.2 Electromagnetic emission and
immunity for "Information Technology Equipment"
2004/108/EC
Electromagnetic Compatibility directive, as amended by EN61326-1:2013
The product(s) to which this declaration relates is in conformity with the essential protection
requirements of 2004/108/EC Electromagnetic Compatibility directive. The products are in conformity
with the following standards and/or other normative documents:
EMC: Harmonized Standards: EN 61326-1:2013 Lab Equipment, EMC
IEC61000-6-3:2007 Emission standard for residential, commercial and light-industrial
environments
IEC61000-4-2:2009 Electrostatic discharge immunity test
IEC61000-4-3:2006 Radiated, radio-frequency, electromagnetic field immunity test
IEC61000-4-4:2012 Electrical fast transient/burst immunity test
IEC61000-4-5:2006 Surge immunity test
IEC61000-4-6: 2014 Immunity to conducted disturbances, induced by radio-frequency fields
IEC61000-4-11:2004 Voltage dips, short interruptions and voltage variations immunity tests
I hereby declare that the equipment named above has been designed to comply with the relevant
sections of the above referenced specifications. The items comply with all applicable Essential
Requirements of the Directives.
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Contents
1
Introduction ......................................................................................................................................... 1
About this Manual ...................................................................................................................... 1
Operating Principle .................................................................................................................... 1
Measuring Water Level ............................................................................................................... 2
Measuring Temperature............................................................................................................. 4
Diver Models ............................................................................................................................... 4
Factory Calibration Procedure................................................................................................... 5
2
Technical Specification ....................................................................................................................... 6
General ....................................................................................................................................... 6
Environmental ............................................................................................................................ 7
Transportation ........................................................................................................................... 7
Temperature............................................................................................................................... 7
Pressure ...................................................................................................................................... 8
Sample Interval and Methods .................................................................................................... 9
3
Diver Installation and Maintenance .................................................................................................. 10
Introduction ............................................................................................................................. 10
Configuring and Reading the Diver .......................................................................................... 10
Installation in a Monitoring Well .............................................................................................. 12
Installation in Surface Water.................................................................................................... 13
Use of Divers at Varying Elevation ........................................................................................... 14
Baro-Diver ................................................................................................................................. 14
Use in Seawater ........................................................................................................................ 14
Diver Maintenance ................................................................................................................... 14
4
Appendix I – Use of Divers at Varying Elevations .............................................................................. 15
5
Appendix II – Diver Communication Protocol ................................................................................... 16
Introduction ............................................................................................................................. 16
Serial Port Settings................................................................................................................... 16
Frame Format ........................................................................................................................... 16
List of Commands .................................................................................................................... 17
6
Appendix III – Diver Accessories ........................................................................................................ 22
Diver-Office software ............................................................................................................... 22
USB Reading Unit ..................................................................................................................... 22
Stainless Steel Cable ................................................................................................................ 22
Cable Clip .................................................................................................................................. 23
Smart Interface Cable .............................................................................................................. 23
Communication Cable ............................................................................................................. 23
Diver-Mate ................................................................................................................................ 24
Diver-DXT .................................................................................................................................. 24
Diver-Gate(M) ........................................................................................................................... 24
Diver-Gate(S) ............................................................................................................................ 25
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1 Introduction
The TD-Diver™ is a compact, groundwater monitoring instrument for continuously measuring level
and temperature in groundwater, surface water, and industrial waters. The data collected can be used
to manage water resources, estimate hydraulic conductivity and other aquifer conditions. Examples
of applications are:
•
•
•
•
monitor potable water recharge areas for water supply,
monitor tailings ponds, dewatering activities and water supply levels of mines,
general site investigations for construction, and
contaminant plume monitoring on spill sites, remediation sites, chemical storage facilities,
landfill sites and hazardous waste storage sites.
The TD-Diver is an easy-to-use datalogger featuring state-of-the-art electronics and a robust high
precision pressure sensor for long term accuracy. The absolute pressure sensor requires minimal
maintenance and re-calibration.
The Diver® is a datalogger housed in a cylindrical casing with a suspension eye at the top. The
suspension eye can be unscrewed and is designed to install the Diver into the monitoring well. The
suspension eye also protects the optical connector. The electronics, sensors and battery are installed
maintenance-free into the casing. The Diver is not designed to be opened.
The name of the datalogger, the model number, the measurement range and the serial number are
clearly identified on the side of the Diver. This information is etched using a laser and is consequently
chemically neutral and not erasable.
1
About this Manual
This manual contains information about Van Essen Instruments’ TD-Diver with part number DI8xx, see
section 2.5, and Baro-Diver® with part number DI800, an instrument designed to measure
groundwater levels and temperature and atmospheric pressure and temperature, respectively.
This chapter contains a brief introduction to the Diver’s measurement principles. Chapter 2 contains
the technical specifications for the TD-Diver and Baro-Diver as well as guidelines for Diver
maintenance. Chapter 3 covers the deployment of Divers. This includes programming the Diver with
the Diver-Office software. Subsequently, installation of Divers in monitoring wells and in surface water
is discussed. There are three appendices that describe the use of Divers at varying elevation, the Diver
communication protocol and a list of Diver accessories.
Operating Principle
The Diver is a datalogger designed to measure water pressure and temperature. Measurements are
subsequently stored in the Diver's internal memory. The Diver consists of a pressure sensor designed
to measure water pressure, a temperature sensor, and a battery that powers the electronics that takes
and stores the measurements. The Diver is an autonomous datalogger that can be programmed by
the user. The Diver has a completely sealed enclosure. The communication between Divers and
Laptops/field devices is based on optical communication.
The Divers measures the absolute pressure. This means that the pressure sensor not only measures
the water pressure, but also the air pressure pushing on the water surface. If the air pressure varies,
the measured water pressure will thus also vary, without varying the water level. The air pressure can
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be measured by a Baro-Diver and subsequently be used in the Diver-Office software to convert the
Diver pressure readings into water level data.
Measuring Water Level
All Divers establish the height of a water column by measuring the water pressure using the built-in
pressure sensor. As long as the Diver is not submerged in water it measures atmospheric pressure, just
like a barometer. Once the Diver is submerged this is supplemented by the water’s pressure: the
higher the water column the higher the measured pressure. The height of the water column above the
Diver's pressure sensor is determined on the basis of the measured pressure.
To measure these variations in atmospheric pressure a Baro-Diver is installed for each site being
measured. The barometric compensation for these variations in atmospheric pressure can be done
using the Diver-Office software, see www.vanessen.com for a free download. It is also possible to use
alternative barometric data such as data made available online.
The barometrically adjusted water values can be related to a reference point such as the top of the
monitoring well or Mean Sea Level (MSL) or any other vertical reference datum.
1.3.1
Converting Diver Data into Water Level
This section explains how to calculate the water level in relation to a vertical reference datum using
the Diver and Baro-Diver’s measurements.
The figure below represents an example of a monitoring well in which a Diver has been installed. In
this case we are therefore interested in the height of the water level (WL) in relation to the vertical
reference datum. If the water level is situated above the reference datum it has a positive value and a
negative value if it is situated below the reference datum.
The top of casing (TOC) is measured in relation to the vertical reference datum and is denoted in the
diagram below as TOC. The Diver is suspended with a cable with a length CL. If the cable length is not
exactly known, it can be calculated from a manual measurement as described in section 1.3.2.
The Baro-Diver measures the atmospheric pressure (pbaro) and the Diver measures the pressure
exerted by the water column (WC) above the Diver and the atmospheric pressure (pDiver).
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2
The water column (WC) above the Diver can be expressed as:
(1)
Ȃ
where p is the pressure in cmH2O, g is the acceleration due to gravity (9.80665 m/s2) and ρ is the
density of the water (1,000 kg/m3).
The water level (WL) in relation to the vertical reference datum can be calculated as follows:
(2)
By substituting WC from equation (1) in equation (2) we obtain:
(3)
Ȃ
1.3.2
Calculating the Cable Length from a Manual Measurement
If the cable length is not exactly known, it can be determined using a manual measurement, see the
figure below. The manual measurement (MM) is taken from the top of casing to the water level. The
value of the water level is positive unless, in exceptional circumstances, the water level is situated
above the top of casing.
The cable length can now be calculated as follows:
(4)
where the water column (WC) is calculated on the basis of the measurements taken by the Diver and
the Baro-Diver.
3
Notes:
•
•
1.3.3
If the pressure measured by the Diver and the Baro-Diver is measured at different points in
time, it is necessary to interpolate. The Diver-Office software automatically performs this
interpolation.
It is possible to enter manual measurements into the Diver-Office software. The software
subsequently automatically calculates the cable length.
Example
The top of casing is measured to be 150 cm above the Mean Seal Level (MSL): TOC = 150 cm. The cable
length is not exactly known and therefore a manual measurement is taken. It turns out to be 120 cm:
MM = 120 cm.
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The Diver measures a pressure of 1,170 cmH2O and the Baro-Diver measures a pressure of 1,030
cmH2O. Substituting these values into equation (1), results in a water column of 140 cm above the
Diver: WC = 140 cm.
Substituting the values of the manual measurement and the water column in equation (4) results in
the following cable length: CL = 120 + 140 = 260 cm.
The water level in relation to MSL can now be easily calculated using equation (2): WL = 150 – 260 +
140 = 30 cm above MSL.
Measuring Temperature
All Divers measure the groundwater temperature. This can, for example, provide information about
groundwater flows.
The temperature is measured using a semiconductor sensor. This sensor not only measures the
temperature, but also uses the value of the temperature to at the same time compensate the pressure
sensor and electronics for the effects of temperature to ensure the best possible performance.
Diver Models
The Diver models described in this manual are from the DI8xx Series: the TD-Diver and the Baro-Diver.
Both models measure absolute pressure and temperature. The summary below describes the two
models.
TD-Diver
This Diver is manufactured using a stainless steel (316 L) casing with a
22 mm diameter. The TD-Diver is capable of storing a maximum of
72,000 measurements (date/time, pressure and temperature) in its
working memory and 72,000 measurements in its backup memory.
The TD-Diver samples pressure and temperature at fixed length
intervals and stores these values in fixed length or continuous memory.
The TD-Diver is available in the following pressure ranges: 10 m, 20 m,
50 m and 100 m.
Baro-Diver
The Baro-Diver is manufactured using a stainless steel (316 L) casing
with a 22 mm diameter. The Baro-Diver is capable of storing a maximum
of 72,000 measurements (date/time, pressure and temperature) in its
working memory and 72,000 measurements in its backup memory.
The Baro-Diver measures atmospheric pressure and is used to
compensate for the variations in atmospheric pressure measured by the
other Divers. The Baro-Diver can also be used for measuring shallow
water levels up to 1 meter.
The Baro-Diver samples pressure and temperature at fixed length
intervals and stores these values in fixed length or continuous memory.
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4
Factory Calibration Procedure
Each Diver is individually calibrated and tested at a number of temperature and pressure values to
ensure superior performance. The Diver is calibrated for the life-time of the instrument, as long as it is
used within its specified range. A calibration certificate is available upon request.
5
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2 Technical Specification
General
The Baro-Diver is used for atmospheric pressure and temperature measurements. There are four TDDiver models with different pressure ranges for pressure and temperature measurements. The table
below lists the general specifications of the Baro-Diver and TD-Diver.
Diameter
Ø 22 mm
Length (incl. suspension ~ 110 mm
eye)
Weight
~ 104 grams
Materials
Casing
Pickled and passivated 316L stainless steel
Pressure sensor
Alumina (Al2O3)
Suspension eye
Nylon PA6 glass fiber reinforced 30%
nose cone
ABS
O-rings
Viton®
Communication
Interface
Optically separated
Protocol
Serial RS232, a limited set of commands is available as specified in Appendix
II
Memory capacity
144,000 measurements
working
72,000 measurements
backup
72,000 measurements
Memory
Non-volatile memory. A measurement consists of
date/time/pressure/temperature
continuous and fixed length memory
Battery life*
Up to 10 years, depending on use
Theoretical battery
capacity
10.5 million measurements + 1000× full memory readouts +
2000× programming
Clock accuracy
Better than ± 1 minute per year at 25 °C
Better than ± 5 minutes per year within the operating temperature range
CE marking
EMC in accordance with the 89/336/EEC directive
Basic EN 61000-4-2 standard
Emissions
EN 55022 (1998) + A1 (2000) + A2 (2003), Class B
Immunity
EN 55024 (1998) + A1 (2000) + A2 (2003)
* The Diver is always in stand-by when not making a measurement. The power consumption of the
integrated battery is dependent on the temperature and usage.
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6
If the Diver is used, stored or transported for extended periods of time under high temperature, this
will adversely affect the life of the battery. The battery’s capacity at lower temperatures is reduced,
but this is not permanent. This is normal behavior for batteries.
Excessive programming, high frequency sampling and data reading will reduce the battery capacity.
** The accuracy of the clock is highly dependent on temperature. The clock is actively compensated
for temperature in all models.
Environmental
Ingress protection
IP68, 10 years continuously submerged in water at 100 m
Transportation
Suitable for transportation by vehicles, ships and airplanes in the supplied packaging.
Resistance to vibration
In accordance with MIL-STD-810.
Mechanical shock test
In accordance with MIL-STD-810, for light-weight equipment
Temperature
-20 °C to 80 °C (affects battery life)
Temperature
Measurement range
-20 °C to 80 °C
Operating Temperature (OT)
TD-Diver: 0 °C to 50 °C
Baro-Diver: -10 °C to 50 °C ambient temperature
Accuracy (max)
± 0.2 °C
Accuracy (typical)
± 0.1 °C
Resolution
0.01 °C
Response time (90% of final value)
3 minutes (in water)
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7
Pressure
The specifications for atmospheric and water pressure measurements vary by type of Diver. The
specifications below apply at operating temperature.
TD-Diver
DI801
DI802
DI805
DI810
Unit
Water column measurement range
10
20
50
100
Accuracy (max)
± 2.0
± 4.0
± 10.0
± 20.0
cmH2O
Accuracy (typical)
± 0.5
± 1.0
± 2.5
± 5.0
cmH2O
Long-term stability
±2
±4
± 10
± 20
cmH2O
Resolution
0.2
0.4
1
2
cmH2O
Display resolution
0.058
0.092
0.192
0.358
cmH2O
Overload pressure
15
30
75
150
Baro-Diver
DI800
Unit
Water column measurement range
1.5
mH2O
mH2O
mH2O
Accuracy (max)
± 2.0
cmH2O
Accuracy (typical)
± 0.5
cmH2O
Long-term stability
±2
cmH2O
Resolution
0.1
cmH2O
Display resolution
0.058
cmH2O
Overload pressure
15
2.5.1
mH2O
Water Column Measurement Range
The height of water above the Diver that can be measured.
2.5.2
Accuracy (maximum)
Accuracy is the proximity of measurement results to the true value. Algebraic sum of all the errors that
influence the pressure measurement. These errors are due to linearity, hysteresis and repeatability.
During the Diver calibration process a Diver is rejected if the difference between the measured
pressure and the applied pressure is larger than the stated accuracy.
2.5.3
Accuracy (typical)
At least 68% of the measurements during the calibration check are within 0.05% FS of the
measurement range.
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8
2.5.4
Long-term Stability
The stability of the measurement over a period of time when a constant pressure is applied at a
constant temperature.
2.5.5
Resolution
The smallest change in pressure that produces a response in the Diver measurement.
2.5.6
Display Resolution
The smallest increment in pressure that the Diver can measure.
2.5.7
Overload Pressure
The pressure at which the Diver pressure sensor will catastrophically fail.
Sample Interval and Methods
The minimum and maximum sample interval plus the various sample methods available for the TDDiver and Baro-Diver are listed below.
Sample interval
0.5 sec to 99 hours
Sample method
Fixed interval
2.6.1
Fixed Length Memory
The Diver will take measurements at a sample interval set by the user, for example every hour. When
the number of samples reaches 72,000, i.e. the memory is full, the Diver will stop measuring.
2.6.2
Continuous Memory
The Diver will take measurements at a preset sample interval data. When the memory fills up, new
samples begin overwriting the oldest records.
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9
3 Diver Installation and Maintenance
Introduction
In practice the Diver is suspended in a monitoring well and the Baro-Diver is installed at the surface for
recording barometric pressure. Atmospheric pressure data must be used to compensate the pressure
measurements recorded by the Divers for variations in atmospheric pressure. In principle, a single
Baro-Diver is sufficient for an area with a radius of 15 kilometers depending on terrain conditions. Also
see Appendix I Use of Divers at Varying Elevation. A 10-meter change in elevation is the equivalent of a
barometric pressure change of approx. 1 cmH2O or 1 mbar.
The following sections describe how to install the Diver and Baro-Diver.
Configuring and Reading the Diver
A Diver must be programmed with the desired sample method, sample interval, and monitoring point
name before it is deployed. The Divers can be programmed, started, stopped and its data read using
the Diver-Office software. The latest version of Diver-Office can be downloaded for free from
www.vanessen.com. Once the software is installed, a Diver can be connected to the computer through
a USB Reading Unit (part no AS330), a USB Interface Cable (part no. AS327) or the Diver-Gate(M) (part
no. AS345).
3.2.1
Configuring a Diver
Open the Diver-Office software and click the Diver button to open the Diver window. See the image
below for an example where the following
•
•
•
monitoring point name: “MW17-ob”,
sample method: “Fixed – Fixed-length memory”
record interval:1 hour.
After entering the settings, the Diver must be programmed by clicking the Program button.
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10
Once the settings are successfully programmed into the Diver the Start button will be enabled.
Clicking the Start button opens the Start Diver dialog as shown below. Here you can select from the
following three start methods:
•
•
•
Immediate Start - Select this option to start the Diver immediately. Upon clicking [Start], the
Diver will begin to take and record samples, as defined in the Diver settings
Future Start - Select this option to start the Diver at a specified time in the future. Use the
date and time boxes to enter the desired future start time.
Smart Future Start - This option is useful in situations where you want to stop the Diver,
download its data and then continue collecting data at the specified sample interval.
After selecting the desired start method, click the [Start] button to save the start settings to the Diver.
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11
3.2.2
Reading Data from a Diver
Click the Data button to download data from the Diver. Click the down arrow next to the Data button
to change the mode/type of data download:
Depending on the sample interval the following 3 options are available:
•
•
•
Data - download all the data recorded by the Diver.
New Data - download only newly recorded data (since the last data download). This option is
not available when the sample interval is 5 seconds or less.
Backup Data - download data from the previous monitoring session.
During the data download the progress is indicated by a progress bar. Once the data has been
downloaded it will be exported if this option is selected in the Project Settings. Subsequently, the
program will jump to the tree view where the downloaded time series will be selected and a
graph/table of the data will be shown.
Installation in a Monitoring Well
Divers are normally installed below the water level/table in
a monitoring well. The depth at which a Diver can be
suspended depends on the instrument’s measurement
range. Further information about the Diver’s range is
contained in the chapter 2 Technical Specification.
12
First determine the length of the non-stretch suspension
cable (part no MO500) based on the lowest groundwater
level. Provide for the required additional length for
attaching the cable to the suspension eye of the Diver and at
the upper end when you cut the wire to size.
Next use cable clips (part no MO310) to attach the ends of
the cable to the monitoring well’s end cover and the Diver’s
suspension eye, respectively.
To determine the distance of the pressure sensor in the
monitoring well requires the precise length of the cable to
be known, to which the distance to the location of the
pressure sensor in the Diver must be added to obtain the
overall effective cable length. This is depicted in the
diagram below.
It is also possible to install the Diver with a communication
cable (part no AS2xxx/AS6xxxx). This cable allows you to readout the Diver at the top of the monitoring
well by using a USB interface cable (part no AS327).
Note that in small diameter wells the installation and removal of the Diver may affect the water level.
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If the TD-Diver replaces a Mini-Diver (part no DI5xx), Micro-Diver (part no DI6xx) or Cera-Diver (part no
DI7xx), the effective cable length must be decreased by 19 mm so that the position of the measuring
point, i.e. the pressure sensor, remains at the identical elevation.
Installation in Surface Water
If a Diver is used in surface water it is important that there is sufficient circulation around the Diver’s
sensor.
Sedimentation, algae and plant growth should be minimized
as much as possible to ensure the Diver measures the
surrounding water level.
Position the Divers deep enough so that they remain
below a possible ice layer.
A steel protective cover that can be locked should be used to
prevent vandalism or theft of the Diver.
In the picture on the right a steel protective cover attached to
a wooden post is shown. Inside the protective cover is a
monitoring tube/screen containing a Diver to measure the
lake’s water level.
Divers can also be used to indirectly measure discharge. In
this case, the Diver is installed in a monitoring tube/screen
next to a weir. The picture below shows a Diver installed next
to a V weir to measure discharge.
13
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Use of Divers at Varying Elevation
Divers can be used at any elevation ranging from 300 meters below sea level to 5,000 meters above
sea level. Appendix I contains further information on the use of Divers at varying elevation.
Baro-Diver
The Baro-Diver must be installed in such a way that it only measures atmospheric pressure under all
conditions. A location that is not subject to rapid temperature variations is preferred.
Use in Seawater
Do not use the TD-Diver in seawater.
The TD-Diver is made of 316L stainless steel. This material is not suited for brackish and/or seawater
because it is subject to corrosion. Corrosion is caused by the salt content, and can be enhanced by
temperature and the other substances in the water.
We recommend the Cera-Diver (part no DI7xx) and/or CTD-Diver (part no DI27x) for use in semi-saline
water/seawater. These Divers have a ceramic casing that does not corrode.
Diver Maintenance
When installed, the Diver does not require any maintenance. The casing can be cleaned with a soft
cloth. Calcium and other deposits can be removed with a commercially available acidic cleaner such
as white vinegar. The flow-through opening can also be rinsed with water and/or a diluted acidic
solution.
Notes:
•
•
Only use diluted acidic solutions if the Diver severe build-up of for example lime scale and
other cleansers are not effective.
Never use any hard brushes, abrasives or sharp objects for cleaning the Diver and always
rinse it properly with clean water after cleaning, particularly near the flow-through openings.
Do not use any powerful jets. This could damage the pressure sensor.
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14
4 Appendix I – Use of Divers at Varying Elevations
Divers can be used at any elevation ranging from 300 meters below sea level to 5,000 meters above
sea level. It is however recommended that all Divers and the Baro-Diver forming part of the same
network be used at the same elevation (whenever possible).
The relationship between atmospheric pressure variations and elevation is exponential, rather than
linear:
PH = P0 · exp[ –(M·g·H)/(R·T)]
where
PH = atmospheric pressure at elevation height H
P0 = atmospheric pressure at reference height
M = 28.8 · 10-3 kg/mol (molecular mass of air)
g = 9.81 m/s2 (standard gravity)
H = height in meters
R = 8.314 J/mol/K (gas constant)
T = temperature in Kelvin
If the Baro-Diver is placed at a different elevation from the other Divers in a monitoring network, it is
possible for a deviation to occur in the barometrically compensated data due to the relationships
referred to above. The graph below illustrates the deviation in the barometric data as a function of the
variation in elevation at 5 °C and 25 °C.
15
30%
25%
deviation [%]
20%
15%
10%
5%
5 °C
25 °C
0%
0
1000
2000
3000
altitude [m]
To determine the relative barometric pressure deviation relative to P0 at 5 °C (T = 278.15°K) at a height
differential of H, the above referenced formula can be used:
(PH - P0) / P0 = 1 – exp[ –(M·g·H)/(R·T)] × 100%
(5)
By substituting the data, a relative deviation of 1.2 % at a height differential of 100 m is obtained. At a
height differential of 1,000 m this increases to 11.5 %.
We therefore recommend that all Divers and the Baro-Divers in a network be placed such that the
mutual height differentials are minimized.
If necessary, multiple Baro-Divers can be deployed to avoid the abovementioned issues.
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5 Appendix II – Diver Communication Protocol
Introduction
The TD-Diver supports a set of commands that allows the user to communicate with the Diver through
other software than Diver-Office. The following commands are available:
•
•
•
•
•
•
•
•
•
reading measured/stored data
read date/time
read serial number
read monitoring point name
real-time pressure and temperature value including time stamp
read sample mode (record method and interval)
read product ID, name, and firmware version
read remaining battery capacity
read status: started, stopped, future start, free memory
Serial Port Settings
Bitrate:
Parity:
Databits:
Stopbits:
9600
None
8
1
Frame Format
16
The frame format for commands and the response are:
STX (1 byte)
Length (1 byte)
OC (2 bytes)
Payload (n bytes)
CC (1 byte)
field
size
description
remarks
STX
1 byte
Start of text, value is 02Hex
Used to identify start of command
Length
1 byte
Length of frame
Number of bytes in frame including STX
and Checksum
OC
2 bytes
OpCode
Identifies the OpCode type
Payload
n bytes
Data field (n bytes)
Data in command or response
CC
1 byte
Checksum
Ones’ complement of the low byte of
the sum of all bytes excluding CC
Time-out:
•
•
All characters/bytes should be send with a maximum time of 30 ms between the bytes.
When the maximum time exceeds 30 ms, a communication error response will be sent.
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Response:
•
•
•
Response will only follow when STX is detected.
Response will follow the command with a delay of 0 to 500 ms (depending on OpCode and/or
other Diver actions).
Communication error will follow when STX is detected, but frame format is not correct,
OpCode is not supported or checksum is not correct.
List of Commands
5.4.1
Read Date/Time
Read the date/time of the Diver clock.
Command:
STX
5
CL
None
CC
CL
YY/MM/DD HH:MM:SS
CC
Response:
STX
22
Data field length exactly 17 characters per described format
YY/MM/DD HH:MM:SS = Date/time format 17 characters
5.4.2
Read Monitoring Point Name
17
Read the name of the monitoring point programmed by the user.
Command:
STX
5
MP
None
CC
MP
XXXXXXXXXXXXXXXXXXXX
CC
Response:
STX
25
Data field length exactly 20 characters
XXXXXXXXXXXXXXXXXXXX = Monitoring point name 20 characters
Example
Description
PB_007.1_Delft______
20 characters (all ASCII)
5.4.3
Read Serial Number
Read the unique serial number of the Diver.
Command:
STX
5
SN
None
© November 2017 Van Essen Instruments. All rights reserved.
CC
www.vanessen.com
Response:
STX
15
SN
XXXXXXXXXX
CC
Data field length exactly 10 characters
XXXXXXXXXX = Serial number 10 characters
Example
Description
AA123_____
10 characters (all ASCII)
5.4.4
Read Real Time Pressure and Temperature Value
Read a real-time pressure and temperature value of the Diver including a time stamp. If this command
is given the Diver will take a reading immediately whether the Diver is logging or not. This data will not
be stored in the Diver memory.
Command:
STX
5
RT
none
CC
RT
YY/MM/DD HH:MM:SSXXXXXX.XXXZZZZZZ.ZZZ
CC
Response:
STX
42
Data field length exactly 37 characters per described format
18
YY/MM/DD HH:MM:SS = Date/time format 17 characters
XXXXXX.XXX = value Level (in CM H2O and with 3 decimal) 10 characters
ZZZZZZZ.ZZZ = value Temperature (in [°C] and with 3 decimals) 10 characters
Example
Description
16/03/23_12:00:00__1422.125____12.835
37 characters (all ASCII)
5.4.5
Read Recorded Pressure and Temperature
Read the data recorded by the Diver. Each data record consisting of a time stamp, pressure and
temperature value must be read separately.
Command:
STX
15
SD
XXXXXXXXXX
CC
Data field length exactly 10 characters per described format
XXXXXXXXXX = Record number 10 characters (first record is record number 1; last record number is
72,000)
Example
Description
10000_____
10 characters (all ASCII)
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Response:
STX
42
SD
YY/MM/DD HH:MM:SSXXXXXX.XXXZZZZZZ.ZZZ
CC
Data field length exactly 37 characters per described format
YY/MM/DD HH:MM:SS = Date/time format 17 characters
XXXXXX.XXX = value Level (in cmH2O and with 3 decimal) 10 characters
ZZZZZZ.ZZZ = value temperature (in degrees Celsius and with 3 decimal) 10 characters
Example
Description
16/01/01_12:00:00__1344.750____12.123
37 characters (all ASCII)
5.4.6
Read Product ID, Name and Firmware Version
Command:
STX
5
PI
none
CC
PI
PP:XXXXXXXXXX:VVVVVV
CC
Response:
STX
25
Data field length exactly 20 characters per described format
PP = Diver type 2 characters; type 19 for TD-Diver and Baro-Diver
19
XXXXXXXXXX = Product name Diver 10 characters
VVVVVV = Firmware version number 6 characters
Example
Description
19:TD-DIVER__:_V1.19
20 characters (all ASCII)
5.4.7
Read Product Status and Free Memory
Read the logging status and the free memory of the Diver. The logging status is either STARTED,
STOPPED, or FUTURE START. The free memory indicates how many records (time stamp, pressure and
temperature value) can be read until the Diver memory is full.
Command:
STX
5
PS
None
CC
PS
XXXXXXXXXXXXX:MMMMMM
CC
Response:
STX
25
Data field length exactly 20 characters per described format
XXXXXXXXXXXXX = Logging status Diver (STARTED, STOPPED, FUTURE START) 13 characters
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MMMMMM = Free memory 6 characters from 0 to 72,000
Example
Description
STARTED______:_62788
20 characters (all ASCII)
5.4.8
Read Sample Method and Interval
Read the Diver’s sample method and interval. The available sample methods are fixed time interval –
continuous (FIXED_RING) and fixed time interval – fixed length memory (FIXED_____), i.e. the Diver
will stop logging when its memory is full.
Command:
STX
5
RS
None
CC
RS
XXXXXXXXXX:YYYYYYYYY:ZZZZZZZZZ
CC
Response:
STX
35
Data field length exactly 30 characters per described format
XXXXXXXXXX = Record method 10 characters
YYYYYYYYY = Record interval 9 characters
ZZZZZZZZZ = 9 spaces (not used)
XXXXXXXXXX
YYYYYYYYY
ZZZZZZZZZ
FIXED_____
xx_SEC___
_________
FIXED_RING
xx_MIN___
_________
5.4.9
20
Read Remaining Battery Capacity
Read how much capacity of the battery is left from the initial capacity (%). Note that this is an
estimated and calculated value and not a measured value.
Command:
STX
5
BC
None
CC
BC
XXXXXXXXXX
CC
Response:
STX
15
Data field length exactly 10 characters per described format
XXXXXXXXXX = Remaining battery capacity in percentage 10 characters
Example
Description
________58
42 % battery capacity used and 58 % battery capacity remaining
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5.4.10 Failure/Error Response
A Diver error response will be returned in the following format:
STX
15
FL
XXXXXXXXXX
CC
Data field length exactly 10 characters per described format
XXXXXXXXXX = Failure/error description 10 characters
Results
Description
TIME-OUT__
Time-out occurs when still expecting characters
UNKNOWN_OC
OpCode not recognized
ERROR_CC__
Checksum received not correct
WRONG_LEN_
Length byte value not correct
ERROR_DATA
Data field not correct (value not correct)
21
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6 Appendix III – Diver Accessories
Diver-Office software
Program Diver dataloggers and download
measurements onto your PC. Export the
data to a spreadsheet or modeling
program. Diver-Office is a flexible “projectbased” measurement software package
designed for exchanging Diver data. DiverOffice is easy-to-use and has an intuitive
user interface.
• Barometric compensation
• Units: Metric and U.S.
• 7 languages: Dutch, English, French,
German, Polish, Portuguese and
Spanish
Free download from www.vanessen.com
USB Reading Unit
The Diver USB Reader can be used for
programming or reading the Diver.
Connect the USB Reader to the USB port of
your PC or Laptop. Simply insert the Diver
into the base of the USB Reading Unit and
you are ready to communicate with your
Diver.
22
The USB Reading Unit can be used in the
field or the office.
Part no: AS330
Stainless Steel Cable
Divers may be suspended on a stainless
steel wireline. This is an inexpensive
method of deployment, and if in a well,
allows the Diver to be easily locked out of
sight and inaccessible.
Part no: MO500
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Cable Clip
The cable clip provides an easy way to
connect a Diver to a stainless steel cable.
The cable clip can also be used to attach
the stainless steel cable with the Diver to
the top of casing.
Part no: MO310 (10 pcs)
Smart Interface Cable
The Diver Smart Interface Cable allows
you to communicate with a Diver that
has been deployed with the
communication cable. The Smart
Interface Cable has a mating connection
for the communication cable on one
end, and a standard USB port on the
other, for connection to a laptop
computer.
The Smart Interface Cable allows for
data download, programming settings,
or starting/stopping the Diver while in
the field.
23
Part no: AS346
Communication Cable
Deploying a Diver on a Diver
communication cable saves time on
downloading and provides real time data
from a Diver. Connect your laptop
equipped with Diver-Office to the Diver
Data Cable using the USB Interface Cable
to program and read data from the Diver.
Available in lengths from 1 meter to 500
meter.
Part no: AS2xxx
xxx = length in meter, e.g 10 meter cable is AS2010
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Diver-Mate
The Diver-Mate is designed for simple and
fast download of data, increasing
download efficiency while reducing data
transfer errors.
The Diver-Mate can store Diver data from
hundreds of Divers. Used in combination
with a Diver communication cable, this
downloading unit stores data in a nonvolatile memory drive, meaning that even
if the battery is empty the data will still be
available. A full battery can support more
than 10 days of operational use and a LED
will indicate when the battery voltage is
low.
Part no: DI420
Diver-DXT
If access to the well is limited by for
example fences or water the Diver-DXT can
be installed to wirelessly collect Diver data
up to a distance of 500 meter.
The Diver-DXT is a battery powered radio
device to acquire data and adjust Diver
settings wirelessly from the Diver to the
Diver-Gate. A built-in barometric
datalogger is used to convert pressure data
into accurate groundwater levels.
24
Part no: AS40x
Diver-Gate(M)
The Diver-Gate(M) is a portable low-power
device that communicates wirelessly with
the Diver-DXT to retrieve data from Diver
dataloggers within a range of 500 meters.
The Diver-Gate(M) is connected to a laptop
equipped with Diver-Office.
See www.vanessen.com/diver-netz for
more information.
Part no: AS345
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Diver-Gate(S)
The Diver-Gate(S) collects data from Divers
deployed with a Diver-DXT within a range
of 500 meters. The collected data is then
automatically transferred to the Diver-HUB
web portal for visualisation.
The Diver-Gate(S) is a low-power device
that can be powered by various sources
such as lithium battery pack, rechargeable
batteries with a solar panel or mains
power.
See www.vanessen.com/diver-netz for
more information.
Part no: AS340
25
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