Campbell Scientific CS250DM A CS250DM PT-1000 Class A, Precision Air Temperature Sensor Owner Manual
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Revision: 04/2021
Copyright © 2020 – 2021
Campbell Scientific, Inc.
Table of contents
7.4 Installation in a radiation shield
7.8 Device Configuration Utility
8. Maintenance and troubleshooting
Appendix A. Importing Short Cut code into CRBasic Editor
Table of Contents - i
1. Introduction
The CS250DM delivers extremely accurate and precise air temperature data necessary for IEC
61724 Class A solar monitoring applications and delta temperature (ΔT) calculations for temperature gradient and stability analysis.
2. Precautions
l
READ AND UNDERSTAND the
section at the back of this manual.
l
When opening the shipping package, do not damage or cut the cable jacket. If damage to the cable is suspected, consult with a Campbell Scientific support engineer.
l
Although rugged, the CS250DM should be handled as a precision scientific instrument.
3. Initial inspection
l l
Upon receipt of the CS250DM, inspect the packaging and contents for damage. File damage claims with the shipping company.
The model number, cable length, Modbus address, and serial settings are printed on a label at the connection end of the cable. Check this information against the shipping documents to ensure the expected product and cable length were received.
4. QuickStart
A video that describes data logger programming using Short Cut is available at: www.campbellsci.com/videos/cr1000x-data logger-getting-started-program-part-3 .
Short
Cut is an easy way to program your data logger to measure the sensor and assign data logger wiring terminals.
Short Cut is available as a download on www.campbellsci.com
. It is included in installations of LoggerNet , RTDAQ , and PC400 .
The following procedure also shows using Short Cut to program the CS250DM.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 1
1. Open Short Cut and click Create New Program.
2. Double-click the data logger model.
3. In the Available Sensors and Devices box, type CS250DM. You can also locate the sensor in the Sensors > Temperature folder. Double click the sensor model. Type the RS-485 address; default address is printed on the cable. The RS-485 address must be unique and may need to be changed if another sensor on the terminal has the same address. Refer to
Device Configuration Utility (p. 14) for information on changing the address. The
temperature defaults to degree C. This can be changed by clicking the Temperature box and selecting one of the other options.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 2
4. Click on the Wiring tab to see how the sensor is to be wired to the data logger. Click OK after wiring the sensor.
5. Repeat steps three and four for other sensors you want to measure. Click Next.
6. In Output Setup, type the scan rate, a meaningful table name, and the Data Output Storage
Interval.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 3
7. Select the measurement and its associated output option.
8. Click Finish and save the program. Send the program just created to the data logger if the data logger is connected to the computer.
9. If the sensor is connected to the data logger, check the output of the sensor in the data display in LoggerNet , RTDAQ , or PC400 to make sure it is making reasonable measurements.
5. Overview
The CS250DM uses a precision PT-1000 class A platinum resistor thermometer (PRT) to provide the highest level of accuracy. The cable includes a Campbell Scientific precision analog-to-digital, smart-sensor module for making the measurements. The module design is optimized for the class A PRT that minimizes self-heating and lead-wire resistance. Measurement electronics are surge protected with 1200 V isolation and environmentally protected with a rugged overmolding with an IP65 rating.
When exposed to sunlight, the CS250DM should be housed in the 41303-5A 6-plate radiation shield or RAD06 6-plate radiation shield.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 4
Features: l
High accuracy and precision l
Exceeds IEC 61724-1 standards for ambient air temperature measurements l
Exceeds EPA standards for ΔT measurements when used with an aspirated radiation shield l
Digital Modbus RS-485 output ensuring data quality over long cable lengths l
Compatible CRBasic data loggers: CR6, CR1000X, CR3000 (with MD485), CR800 series (with
MD485), CR300 series (with MD485), CR1000 (with MD485), l
Easily interfaces with the MeteoPV Platform without coding l
Directly connects with Modbus RTU RS-485 Networks
6. Specifications
Sensing element:
Precision:
Accuracy:
Long-term stability:
1000 ohm Class A platinum (PT1000)
± (0.15 + 0.002t) °C
Maximum R o drift = 0.04% after 1000 hours at 400 °C
Measurement temperature range: –75 to +250 °C
Time constant: 15 seconds in 5 m/s wind
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 5
Measurement uncertainty:
Element stem material:
Surge protection:
Supply voltage:
Power consumption:
Temperature coefficient:
Communications
Protocol:
Format:
Baud rate:
Modbus ID:
Stem diameter:
Overall stem length:
Cable (Sensor head to DM board)
Wire size and type:
Insulation type:
Insulation rating:
Sheath:
Number of cores:
Physical properties:
Overall diameter:
Sensor dimensions:
Cable (DM board to PT)
Wire size and type:
Insulation type:
UL:
Filler:
± (0.15 + 0.002t) °C
316L Stainless Steel sheathed
1200 V isolation
5 to 30 VDC
15 mA
TCR = 3850 ppm/K
24-bit ADC
Modbus RTU protocol (over RS-485)
8 data bits, 1 stop bit, even parity as default (userconfigurable)
19,200 bps as default (user-configurable)
Last two digits of serial number as default (userconfigurable)
0.32 cm (0.125 in)
6.35 cm (2.5 in)
24 AWG (7/32,RT38) copper
PFA insulated (Teflon®)
–75 to +250 °C
Thin PFA sheathed overall
3
Good abrasion and moisture resistance
2.1 mm (0.08 in)
17.2 x 11.1 x 6.1 cm (6.8 x 4.4 x 2.4 in)
24 AWG (7/32) tinned copper
PVC
AWM 10012 1000V 105°C
Fibrillated polypropylene as required for uniform round construction
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 6
Drain:
Shield:
Nominal wire diameter:
Weight:
Compliance:
24 AWG (7/32) tinned copper
(cabled, touching foil)
Aluminum/Mylar (100% coverage, 25% minimum overlap, foil facing in)
0.61 mm (0.024 in)
90.7 g with 3.2 m cable
(0.2 lb with 10.5 ft cable)
View documents at: www.campbellsci.com/cs250dm
7. Installation
If you are programming your data logger with Short Cut , skip
Short Cut does this work for you. See
Short Cut tutorial.
This section discusses the following.
7.4 Installation in a radiation shield
7.8 Device Configuration Utility
7.1 Wiring
The RS-485 output can be directly read by a MeteoPV, CR6, CR1000X, or Modbus RTU RS-485 network (
Table 7-1 (p. 8)). Other Campbell Scientific data loggers can use an MD485 multidrop
interface to read the RS-485 output. Refer to the MD485 manual for more information. The
Modbus address must be unique and may need to be changed if another sensor on the bus has the same address. Change the Modbus address using the Device Configuration Utility or through
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 7
Modbus commands. For more information, refer to
Device Configuration Utility (p. 14) or
Table 7-1: Wire Color, Station Connection, and Function
Wire color
Station or data logger terminal
Blue
White/blue striped
A– (C odd)
B+ (C even)
Brown
White/brown striped
Green
Clear
12V
G
G
G
Function
RS-485 A/A' [–]
RS-485 B/B' [+]
5 to 30 VDC
Ground (power)
Modbus common
Shield
7.2 Programming
Short Cut is the best source for up-to-date programming code for Campbell Scientific data loggers. If your data acquisition requirements are simple, you can probably create and maintain a data logger program exclusively with Short Cut . If your data acquisition needs are more complex, the files that Short Cut creates are a great source for programming code to start a new program or add to an existing custom program.
NOTE:
Short Cut cannot edit programs after they are imported and edited in CRBasic Editor .
A Short Cut tutorial is available in
QuickStart (p. 1). If you wish to import
Short Cut code into
CRBasic Editor to create or add to a customized program, follow the procedure in
Short Cut code into CRBasic Editor (p. 17). Programming basics for CRBasic data loggers are
provided in the following section. A downloadable example program is available at www.campbellsci.com/downloads/cs250dm-program-example .
7.2.1 Modbus programming
The RS-485 output can be directly read by a CR6-series, CR1000X-series, or Modbus RTU RS-485 network. Other Campbell Scientific data loggers can use an MD485 multidrop interface to read the RS-485 output. Refer to the MD485 manual for information about using the MD485.
A CR6 or CR1000X data logger programmed as a Modbus Master can retrieve the values stored
in the Input Registers ( Modbus register map (p. 12)). To do this, the CRBasic program requires
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 8
SerialOpen() followed by ModbusMaster() . The SerialOpen instruction has the following syntax:
SerialOpen (ComPort, Baud, Format, TXDelay, BufferSize, Mode)
The Format parameter is typically set to logic 1 low; even parity, one stop bit, 8 data bits. The
Mode parameter should configure the ComPort as RS-485 half-duplex, transparent.
The ModbusMaster() instruction has the following syntax:
ModbusMaster (Result, ComPort, Baud, Addr, Function, Variable, Start, Length,
Tries, TimeOut, [ModbusOption])
The Addr parameter must match the sensor Modbus address. The Modbus address must be unique and may need to be changed if another sensor on the terminal has the same address. The default value for the Modbus address is the last two digits of the sensor serial number, with exceptions for serial numbers ending in 00 and 01. These exceptions default to Modbus addresses of 110 and 111, respectively. The default Modbus address and serial settings are printed on the cable. To collect all of the CS250DM values, the Start parameter needs to be 1 and the
Length parameter needs to be 5.
ModbusOption is an optional parameter described in the
CRBasic Editor Help.
7.3 Siting
The general EPA guidance for standard meteorological stations is to locate the sensor over an open, level area at least 9 m (29.5 ft) in diameter. The surface should be covered by short grass or the natural earth surface where grass does not grow. Sensors should be located at a distance of at least ten times the height of any nearby obstruction and at least 30 m (98.4 ft) from large, paved areas. Sensors should be protected from thermal radiation and adequately ventilated.
Protect the filter at the top of the sensor from exposure to liquid water.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 9
FIGURE 7-1. Clearances
The sensor should be installed at a standard measurement height which varies depending on the guides being used: l l l
1.5 m (4.92 ft) (AASC)
1.25 to 2.0 m (4.1 to 6.5 ft) (WMO)
2.0 m (6.5 ft) (EPA)
When used in the field, the CS250DM must be housed in a radiation shield. Typically, the RAD06
6-plate radiation shield is used.
The white color of these shields reflects solar radiation, and the louvered construction allows air to pass freely through, thereby keeping the sensor at or near ambient temperature. The RAD06 uses a double-louvered design that offers improved sensor protection from insect intrusion and driving rain and snow. In addition, compared to shields of a similar appearance, the RAD shields have lower self-heating in bright sunlight combined with low wind speeds giving a better measurement. The RAD06 attaches to a crossarm, mast, or pipe with a 2.5 to 5.3 cm (1.0 to 2.1
inch) outer diameter.
Tools required for installing a radiation shield to a tripod or tower include: l l l l l l adjustable wrench (to suit 12 mm (1/2 in) nuts) small screwdriver provided with data logger small Phillips screwdriver
UV-resistant cable ties small pair of diagonal-cutting pliers adjustable wrench with a minimum 50 mm (2 in) jaw size.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 10
7.4 Installation in a radiation shield
1. Insert the CS250DM in the sleeve.
2. Loosen the nut on the entry gland at the bottom of the shield.
3. Insert the sensor into the gland.
4. First tighten the nut on the gland by hand until the sensor is held firmly in place. Then use the large adjustable wrench to further tighten the gland by 1/2 to 1 turn.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 11
7.5 Mount the shield
1. Attach the radiation shield to the tripod mast, crossarm, or tower leg using the supplied
U-bolt or band clamp.
2. Route the cable to the data logger, and secure the cable to the mounting structure using cable ties.
CAUTION:
Failure to secure the cable can lead to breakage of the wires due to fatigue caused by blowing back and forth in the wind.
7.6 Long cable lengths
Digital data transfer eliminates offset errors due to cable lengths. However, digital communications can break down when cables are too long, resulting in either no response from the sensor or corrupted readings. Maximum cable lengths depend on the number of sensors connected, the type of cable used, and the environment of the application. Follow these guidelines when using long cables: l l l
Use low capacitance, low resistance, screened cable (as supplied by Campbell Scientific) to reach distances of several hundred meters.
Ensure that the power ground wire has low resistance and is connected to the same ground reference as the data logger control terminals.
Be aware that daisy-chaining sensors reduces the maximum cable length roughly in proportion to the number of sensors connected in parallel.
7.7 Modbus register map
Table 7-2 (p. 12) provides the input register map (function code 4) and
the holding register map (functions 3, 6, and 16).
Table 7-2: Input register map
Input register Value
Modbus data type
Description
30001
30003
Serial number
Temperature
Float 1
Float
1
Specifies the sensor serial number assigned by the factory
The stored value is in degrees Celsius.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 12
Table 7-2: Input register map
Input register
30005
Value
Counter
30007 Sensor status
30009
Temperature range check
1 Modbus float is a 32-bit integer.
Modbus data type
Float
Float
Float
1
1
1
Description
The counter provides an indicator that the sensor is actively taking measurements. This value will increment once per measurement, resetting to 0 after 10,000.
0 = good
1 = open/short
0 = good/in range
1 = out of range
Table 7-3: Holding register map
Holding register
40001
Value
Modbus data type
Modbus address Unsigned short 1
Description
Modbus device address (1 to 247)
40002
40003
Baud rate
Parity
Unsigned short 1
1 = 9600 bps
2 = 19200 bps
3 = 38400 bps
4 =57600 bps
5 = 115200 bps
Unsigned short 1
0 = no parity
1 = odd
2 = even
40004 Stop bit Unsigned short 1
1 = 1 stop bit
2 = 2 stop bits
40005
Termination resistor
1 Unsigned short data is a 16-bit positive integer.
Unsigned short
1
0 = off/disable
1 = on/enable
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 13
7.8
Device Configuration Utility
Device Configuration Utility is bundled in Campbell Scientific data logger support software and is available, at no cost, from www.campbellsci.com/downloads . Use Device Configuration Utility to change the CS250DM settings, view stored values, and update the CS250DM operating system (OS). It also provides CS250DM wiring information.
Connection to Device Configuration Utility requires a USB-to-RS-485 adapter and a 12 VDC power supply. Use the following procedure for connecting to Device Configuration Utility :
1. Open Device Configuration Utility .
2. Under Device Type, click CS250DM.
3. Follow steps listed under Connecting to a CM250DM with a USB to RS-485 adapter.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 14
4. Click the Holding Registers tab to change settings. The default Modbus address and serial settings are printed on the cable. The Modbus address must be unique and may need to be changed if another sensor on the terminal has the same address. The default value for the
Modbus address is the last two digits of the sensor serial number, with exceptions for serial numbers ending in 00 and 01. These exceptions default to Modbus addresses of 110 and 111, respectively. Most Modbus systems use the default Baud Rate, Parity, Stop Bits, and
Termination Resistor values.
5. Click the Input Registers tab to view the stored values.
8. Maintenance and troubleshooting
NOTE:
All factory repairs and recalibrations require a returned material authorization (RMA) and completion of the “Statement of Product Cleanliness and Decontamination” form. Refer to the
page at the end of this manual for more information.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 15
8.1 Maintenance
The CS250DM requires minimal maintenance. Periodically check cabling for proper connections, signs of damage, and possible moisture intrusion. Check the radiation shield monthly to make sure it is free from dust and debris. To clean the shield, first remove the sensor. Dismount the shield. Brush all loose dirt off. If more effort is needed, use warm, soapy water and a soft cloth or brush to thoroughly clean the shield. Allow the shield to dry before remounting.
8.2 Troubleshooting
Symptom: Temperature is NAN, –INF, –9999, –273
Verify wiring of sensor to the data logger; cross-reference data logger program or the measurement system wiring diagram.
Symptom: Incorrect Temperature
Check the cable for signs of damage and possible moisture intrusion.
Symptom: Unstable Temperature
Make sure the shield and ground wires are connected to data logger ground, and the data logger is properly grounded.
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 16
Appendix A. Importing Short
Cut code into CRBasic Editor
Short Cut creates a .DEF file that contains wiring information and a program file that can be imported into the CRBasic Editor . By default, these files reside in the C:\campbellsci\SCWin folder.
Import Short Cut program file and wiring information into CRBasic Editor :
1. Create the Short Cut program. After saving the Short Cut program, click the Advanced tab then the CRBasic Editor button. A program file with a generic name will open in CRBasic.
Provide a meaningful name and save the CRBasic program. This program can now be edited for additional refinement.
NOTE:
Once the file is edited with CRBasic Editor , Short Cut can no longer be used to edit the program it created.
2. To add the Short Cut wiring information into the new CRBasic program, open the .DEF file located in the C:\campbellsci\SCWin folder, and copy the wiring information, which is at the beginning of the .DEF file.
3. Go into the CRBasic program and paste the wiring information into it.
4. In the CRBasic program, highlight the wiring information, right-click, and select Comment
Block. This adds an apostrophe (') to the beginning of each of the highlighted lines, which instructs the data logger compiler to ignore those lines when compiling. The Comment
Block feature is demonstrated at about 5:10 in the CRBasic | Features video .
CS250DM PT-1000 Class A, Precision Air Temperature Sensor 17
Limited warranty
Products manufactured by Campbell Scientific are warranted by Campbell Scientific 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 on the corresponding product webpage.
See Product Details on the Ordering Information pages at www.campbellsci.com
. Other manufacturer's products, that are resold by Campbell Scientific, are warranted only to the limits extended by the original manufacturer.
Refer to www.campbellsci.com/terms#warranty for more information.
CAMPBELL SCIENTIFIC EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Campbell Scientific 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.
Products shipped to Campbell Scientific require a Returned Materials Authorization (RMA) or
Repair Reference number and must be clean and uncontaminated by harmful substances, such as hazardous materials, chemicals, insects, and pests. Please complete the required forms prior to shipping equipment.
Campbell Scientific regional offices handle repairs for customers within their territories. Please see the back page for the Global Sales and Support Network or visit www.campbellsci.com/contact to determine which Campbell Scientific office serves your country.
To obtain a Returned Materials Authorization or Repair Reference number, contact your
CAMPBELL SCIENTIFIC regional office. Please write the issued number clearly on the outside of the shipping container and ship as directed.
For all returns, the customer must provide a “Statement of Product Cleanliness and
Decontamination” or “Declaration of Hazardous Material and Decontamination” form and comply with the requirements specified in it. The form is available from your CAMPBELL
SCIENTIFIC regional office. Campbell Scientific is unable to process any returns until we receive this statement. If the statement 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. 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 l
Protect from over-voltage.
l l l l l
Protect electrical equipment from water.
Protect from electrostatic discharge (ESD).
Protect from lightning.
Prior to performing site or installation work, obtain required approvals and permits. Comply with all governing structure-height regulations.
Use only qualified personnel for installation, use, and maintenance of tripods and towers, and any attachments to tripods and towers. The l l l l 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 l
You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are installing, constructing, using, or maintaining, or l 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, 6 meters (20 feet), or the distance required by applicable law, l l 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.
l
Only use power sources approved for use in the country of installation to power Campbell Scientific devices.
Elevated Work and Weather l
Exercise extreme caution when performing elevated work.
l l
Use appropriate equipment and safety practices.
During installation and maintenance, keep tower and tripod sites clear of un-trained or non-essential personnel. Take precautions to prevent elevated tools and objects from dropping.
l
Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.
Maintenance l
Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks, frayed cables, loose cable clamps, cable tightness, l etc. and take necessary corrective actions.
Periodically (at least yearly) check electrical ground connections.
Internal Battery l
Be aware of fire, explosion, and severe-burn hazards.
l l
Misuse or improper installation of the internal lithium battery can cause severe injury.
Do not recharge, disassemble, heat above 100 °C (212 °F), solder directly to the cell, incinerate, or expose contents to water. Dispose of spent batteries properly.
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.
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