Campbell CS240 User manual

CS 240 and
CS 240
DM
PT-
1000 Class A,
Back-of-
Module
Temperature Sensors
Revision
: 5/18
Copyright ©
2017 – 2018
Campbell Scientific, Inc.

Assistance
Products may not be returned without prior authorization. The following
contact information is for Canadian and international clients residing in
countries served by Campbell Scientific (Canada) Corp. directly. Affiliate
companies handle repairs for clients within their territories. Please visit
www.campbellsci.ca to determine which Campbell Scientific company serves
your country.
To obtain a Returned Materials Authorization (RMA), contact CAMPBELL
SCIENTIFIC (CANADA) CORP., phone [phone].After a
measurement consultant 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 (CANADA) CORP.
RMA#_____
14532 131 Avenue NW
Edmonton, Alberta T5L 4X4
Canada
For all returns, the client 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.ca/repair. A
completed form must be either emailed to [e-mail] or faxed to
[phone]. Campbell Scientific (Canada) Corp. 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 client at
the client’s expense. Campbell Scientific (Canada) Corp.f reserves the right to
refuse service on products that were exposed to contaminants that may cause
health or safety concerns for our employees.

Precautions
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.ca or by
telephoning [phone] (Canada). 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 personnel (e.g. 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.
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, 6 meters (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 non-
essential 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 CLIENT 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.

PLEASE READ FIRST
About this manual
Please note that this manual was originally produced by Campbell Scientific Inc. (CSI) primarily
for the US market. Some spellings, weights and measures may reflect this origin.
Some useful conversion factors:
Area: 1 in2(square inch) = 645 mm2
Length: 1 in. (inch) = 25.4 mm
1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km
Mass: 1 oz. (ounce) = 28.35 g
1 lb (pound weight) = 0.454 kg
Pressure: 1 psi (lb/in2) = 68.95 mb
Volume: 1 US gallon = 3.785 litres
In addition, part ordering numbers may vary. For example, the CABLE5CBL is a CSI part
number and known as a FIN5COND at Campbell Scientific Canada (CSC). CSC Technical
Support will be pleased to assist with any questions.
About sensor wiring
Please note that certain sensor configurations may require a user supplied jumper wire. It is
recommended to review the sensor configuration requirements for your application and supply the jumper
wire is necessary.

i
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. QuickStart...................................................................2
5. Overview .....................................................................4
6. Specifications.............................................................5
7. Installation ..................................................................7
7.1 Placement on a Photovoltaic (PV) Module ..........................................7
7.2 Mounting/Cable Strain Relief ..............................................................7
7.2.1 Adhesive Mounting Strip ..............................................................7
7.2.2 Kapton Tape..................................................................................7
7.2.3 Strain Relief of CS240DM Analog-to-Digital Module.................9
7.3 Wiring ..................................................................................................9
7.3.1 Circuit Diagrams...........................................................................9
7.3.2 CS240-to-Datalogger Wiring......................................................10
7.3.3 CS240DM Wiring.......................................................................11
7.4 Datalogger Programming ...................................................................12
7.4.1 CS240 Programming...................................................................12
7.4.1.1 Resistance Measurement ..................................................12
7.4.1.2 Converting Resistance Measurement to Temperature......13
7.4.2 CS240DM Programming ............................................................13
8. Operation..................................................................14
8.1 Electrical Noisy Environments ..........................................................14
8.2 Long Cable Lengths ...........................................................................14
8.2.1 CS240 Cable Resistance/Long Cable Lengths............................14
8.2.2 CS240DM Long Cable Lengths..................................................15
8.3 CS240DM and Device Configuration Utility.....................................15
9. Maintenance and Troubleshooting .........................16
9.1 Troubleshooting .................................................................................16
9.2 Maintenance .......................................................................................16
Appendices
A. Importing Short Cut Code Into CRBasic Editor ... A-1

Table of Contents
ii
B. Example Programs.................................................B-1
B.1 CS240 Two-Wire Configuration Programs..................................... B-1
B.2 CS240 Four-Wire Configuration Programs..................................... B-4
B.3 CS240DM Program......................................................................... B-7
C. Sensor Material Properties.................................... C-1
C.1 3M 9485PC Adhesive ..................................................................... C-1
Figures
5-1. CS240/CS240DM Temperature Sensor .............................................. 5
7-1. Strain Relief Label on the Cable ......................................................... 8
7-2. Proper Kapton Tape Usage.................................................................. 9
7-3. 2-Wire Circuit Diagram..................................................................... 10
7-4. 4-Wire Circuit Diagram..................................................................... 10
Table
7-1. Wire Color, Function, and Datalogger Connection for the CS240
2-Wire Configuration..................................................................... 11
7-2. Wire Color and Datalogger Connection for the CS240 4-Wire
Configuration ................................................................................. 11
7-3. Wire Color, Function, and Datalogger Connection for the
CS240DM ...................................................................................... 12
7-4. CS240DM Stored Values .................................................................. 13
CRBasic Examples
B-1. CR300 2-Wire Configuration for Measuring the CS240................. B-1
B-2. CR6 2-Wire Configuration for Measuring the CS240..................... B-2
B-3. CR1000X 2-Wire Configuration for Measuring the CS240............ B-3
B-4. CR300 4-Wire Configuration for Measuring the CS240................. B-4
B-5. CR6 4-Wire Configuration for Measuring the CS240..................... B-5
B-6. CR1000X 4-Wire Configuration for Measuring the CS240............ B-6
B-7. CS240DM RS-485 Modbus Program.............................................. B-7

1
CS240 and CS240DM PT-1000 Class A,
Back-of-Module Temperature Sensors
1. Introduction
The CS240 and CS240DM temperature sensors use a precision 1000 ohm
class A platinum resistance temperature detector to measure temperature from
–40 to 105 °C. They are designed for measuring the back-of-photovoltaic (PV)
module temperature but also can be used to measure the surface temperature of
other devices. The CS240 can be measured with a 2-wire or 4-wire
configuration and is compatible with most Campbell Scientific dataloggers.
The CS240DM has a digital RS-485 output that can be directly read by a
MeteoPV, CR6, CR1000X, or Modbus RTU RS-485 network. Other Campbell
Scientific dataloggers can use an MD485 multidrop interface to read the
CS240DM output.
This manual provides information only for CRBasic dataloggers.
The CS240 is also compatible with most of our retired Edlog
dataloggers. For Edlog datalogger support, contact Campbell
Scientific.
2. Precautions
•READ AND UNDERSTAND the Safety section at the front of this
manual.
•Do not use epoxy to secure the sensor to a PV module; use Kapton tape.
•Clean the PV module before adhering the sensor to it. The sensor must be
adhered to a clean surface for its mounting strip adhesive to function
properly.
•If using Kapton tape to secure the disk to the PV module, do not go over
the sensor molding with the tape; only put tape over the metal disk portion
of the sensor.
•Prying the sensor off will likely damage both the sensor and PV module.
•Proper strain relief of the cable is required after mounting the sensor to the
measurement surface (Section 7.2, Mounting/Cable Strain Relief (p. 7)).
•Placement of the cable inside a rugged conduit is advisable for long cable
runs, especially in locations subject to digging, mowing, traffic, use of
power tools, animals, or lightning strikes.
NOTE

CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
2
3. Initial Inspection
•Upon receipt of the sensor, inspect the packaging and contents for damage.
File damage claims with the shipping company.
•The model number, cable length, wiring diagrams, and cable resistance
(CS240 only) 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
The information provided in this section is for the CS240.
A video that describes datalogger programming using Short Cut is available at:
www.campbellsci.com/videos/cr1000x-datalogger-getting-started-program-
part-3. Short Cut is an easy way to program your datalogger to measure the
CS240 and assign datalogger wiring terminals. Short Cut is available as a
download on www.campbellsci.com. It is included in installations of
LoggerNet, PC200W, PC400, or RTDAQ.
The following procedure also shows using Short Cut to program the CS240.
1. Open Short Cut and select to create a new program.
2. Double-click the datalogger model.
3. In the Available Sensors and Devices box, type CS240. You can also
locate the sensor in the Sensors | Temperature folder. Double-click either
CS240 (2-Wire) RTD or CS240 (4-Wire) RTD. If using the 2-wire
configuration, type the Cable Resistance. This value is unique for each
CS240, and is printed on the heat shrink label attached to the sensor cable.
The surface temperature defaults to degree C. This can be changed by
clicking the Temperature box and selecting one of the other options.
After entering the Properties, click on the Wiring tab to see how the
sensor is to be wired to the datalogger.

CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
3
4. Repeat step three for other sensors you want to measure.
5. In Output Setup, type the scan rate, a meaningful table name, and the
Data Output Storage Interval.

CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
4
6. Select the measurement and its associated output option.
7. Click Finish and save the program. Send the program just created to the
datalogger if the datalogger is connected to the computer.
8. If the sensor is connected to the datalogger, check the output of the sensor
in LoggerNet, PC400, RTDAQ, or PC200W to make sure it is making
reasonable measurements.
5. Overview
The CS240 and CS240DM are surface mountable platinum resistive
thermometers (PRT) that measure back-of-module temperature for solar energy
applications. They use a precision PT-1000 class A PRT to provide the highest
level of accuracy. To withstand the harsh treatment commonly seen in
meteorological station installation, the sensing element is safely housed inside
a specially designed self-adhesive aluminum disk (FIGURE 5-1).
The disk protects the PRT, particularly during installation, and promotes heat
transfer from the surface. An adhesive tab on the disk fastens the sensor to the
measurement surface. If the temperature may exceed 70 °C, Kapton tape is also
required to secure the sensor.
The CS240DM 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.
The CS240 and CS240DM provide PV stakeholders with highly accurate
back-of-module temperature, even at long cable lengths, for use in power
performance modeling and simulation of solar energy applications.
Back-of-module temperature is critical for any evaluation of effective
irradiance and power conversion.

CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
5
FIGURE 5-1. CS240/CS240DM Temperature Sensor
6. Specifications
Features:
•Precision PT1000 class A sensing element
•Any cable length available—user-selectable and standard lengths
offered
•Rugged design holds up in harsh conditions and conduit installations
•Self-adhesive backing for easy mounting lasts decades
•CS240 has 2-wire or 4-wire configurations to satisfy accuracy even at
long cable lengths
•CS240 compatible with Campbell Scientific CRBasic dataloggers:
CR300 series, CR6 series, CR800 series, CR1000, CR1000X series,
CR3000, and CR5000
•CS240DM compatible with Campbell Scientific CRBasic dataloggers:
CR6 series, CR1000X series, CR300 series (with MD485), CR800
series (with MD485), CR1000 (with MD485), CR3000 (with MD485)
•CS240DM easily interfaces with the MeteoPV Platform without
coding
•CS240DM can connect directly with Modbus RTU RS-485 Networks
•Calibration services with certification available
Sensor:Precision 1000 ohm class A platinum
sensing element
Accuracy: ± (0.15 + 0.002t) °C
Temperature Range: –40 to 135 °C
Temperature Coefficient: TCR = 3850 ppm/K
Long-term Stability: Max Rodrift = 0.04% after 1000 h
at 400 °C
Santoprene®-jacketed cable
Overmolded joint
PT1000 class A PRT encased in
an aluminum disk

CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
6
CS240 Measuring Current: 0.1 to 0.3 mA
Disk Diameter: 2.54 cm (1.0 in)
Overall Sensor Length: 6.35 cm (2.5 in)
Overmolded Joint Dimensions
Width: 1.12 cm (0.44 in)
Height: 1.47 cm (0.58 in)
Length: 5.72 cm (2.25 in)
Cable Diameter: 0.622 cm (0.245 in)
Disk Material:Anodized aluminum
Weight: 90.7 g (0.2 lb) with 3.2 m (10.5 ft) cable
CS240DM Analog-to-Digital
Module: 24-bit Adc
A/D Measurement
Uncertainty: ±0.015 °C
Power Consumption: 15 mA
Surge Protection: 1200 V isolation
Environmental Protection: Rugged overmolding with IP65 rating
Approvals: UL AWM 2586 1000V 105 °C; CSA
AWM 600V 105 °C FT1
Conforms with Electromagnetic
Compatibility Directive (EMC)
Conforms with the Restriction of
Hazardous Substances Directive (RoHS2)
Compliance: View EU Declaration of Conformity at
www.campbellsci.com/cs240 or
www.campbellsci.com/cs240dm
Compliant with IEC 60751, DIN EN 60751,
Industrial Design (IEC Class 4) (according
to IEC 751)
CS240 Cable
Jacket Material: Black semi-gloss PVC, UL VW-1 sunlight
resistant for outdoor use
Wire Size and Type: 24 AWG (7/32) tinned copper
Nominal Wire Diameter: 0.61 mm (0.024 in)
Insulation Type: PVC
UL: AWM 10012 1000V 105 °C
Filler: Fibrillated polypropylene as required for
uniform round construction.
Drain: 24 AWG (7/32) tinned copper (cabled,
touching foil)
Shield: Aluminum/mylar (100% coverage, 25%
minimum overlap, foil facing in)

CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
7
CS240DM Cable
Features: High flex construction with jacket for
pulling through conduit
Jacket Material: Black semi-gloss PVC, UL VW-1 sunlight
resistant for outdoor use; weld spatter and
oil resistant
Nominal Wire Diameter: 0.61 mm (0.024 in)
Agency Approvals:UL AWM Style 2463 and NEC/CEC
CMX outdoor
7. Installation
If you are programming your datalogger with Short Cut, skip Section 7.3,
Wiring (p. 9), and Section 7.4, Datalogger Programming (p. 12). Short Cut does
this work for you. See Section 4, QuickStart (p. 2), for a Short Cut tutorial.
7.1 Placement on a Photovoltaic (PV) Module
The PV module may or may not have distinctive photocells. If the PV module
does not have distinctive photocells, center the sensor on the back of the PV
module. If the module has several distinctive photocells, center the sensor on
the back of the photocell that is the middle of the PV module.
7.2 Mounting/Cable Strain Relief
Before mounting, the installers need to wash their hands
and then clean the back of the PV module or other device
with ethyl alcohol.
7.2.1 Adhesive Mounting Strip
The CS240 and CS240DM include an adhesive mounting strip adhered to the
flat surface of the aluminum disk. To mount the sensor, remove the paper from
the mounting strip and adhere it to the back of the PV module or other device.
The mounting strip must be adhered to a clean surface for its adhesive to
function properly.
Do not use epoxy to secure the sensor to a PV module.
7.2.2 Kapton Tape
Use Kapton tape for cable strain relief; a yellow label on the cable indicates
where the cable must be secured (FIGURE 7-1). If the temperature might
exceed 70 °C, Kapton tape is also required to better secure the sensor to the
measurement surface (FIGURE 7-2).
To ensure that the sensor disk and cable are adequately fastened to the
measurement surface, use three strips of Kapton tape in two places each:
1. For strain relief, place the first strip of tape across the cable just below the
yellow heat shrink (FIGURE 7-1) and rub the tape surface to remove
bubbles.
CAUTION
CAUTION

CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
8
2. Place the other strips of tape on the first strip of tape and rub the tape
surface to remove bubbles. These strips of tape should be perpendicular to
the first strip of tape—forming an “H” (FIGURE 7-2).
3. To secure the sensor to the module surface, remove the paper from the
bottom of the disk and adhere the disk to the PV module (Section 7.1,
Placement on a Photovoltaic (PV) Module (p. 7)).
4. Place a strip of tape across the sensor head, perpendicular to the cable and
rub the tape surface to remove bubbles. Rub as close as possible to the
sensor disk.
Do not go over the sensor molding with the tape; only put
tape over the metal disk portion of the sensor.
5. Place the two other strips of tape on the ends of the sensor disk,
perpendicular to the first piece of tape and parallel to the cable then rub the
tape surface into the module surface (FIGURE 7-2).
FIGURE 7-1. Strain Relief Label on the Cable
CAUTION

CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
9
FIGURE 7-2. Proper Kapton Tape Usage
7.2.3 Strain Relief of CS240DM Analog-to-Digital Module
The CS240DM has an analog-to-digital, smart-sensor module incorporated that
needs to be secured to the side of PV module. Use two cable tie tabs and cable
ties to do this.
7.3 Wiring
7.3.1 Circuit Diagrams
FIGURE 7-3 provides the circuit diagrams for the CS240 2-wire configuration.
FIGURE 7-4 provides the circuit diagram for the CS240DM or the CS240
4-wire configuration.

CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
10
FIGURE 7-3. 2-Wire Circuit Diagram
FIGURE 7-4. 4-Wire Circuit Diagram
7.3.2 CS240-to-Datalogger Wiring
The dataloggers can measure the CS240 by using a 2-wire or 4-wire
configuration (TABLE 7-1 and TABLE 7-2). The 2-wire configuration
accuracy decreases, relative to the 4-wire, as a function of the cable length. The
4-wire configuration eliminates resistance due to cable length and is the most
accurate way to measure this sensor. The CS240 is shipped ready for the 2-wire
configuration. The wires used only for the 4-wire configuration are taped to the
side of the cable.

CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
11
TABLE 7-1. Wire Color, Function, and Datalogger Connection
for the CS240 2-Wire Configuration
Wire
Color Wire Function Datalogger Connection Terminal
Black Voltage
excitation input
U configured for voltage excitation1, EX,
VX (voltage excitation)
White Analog voltage
output
U configured for single-ended analog input1,
SE (single-ended, analog input)
Red Reference
⏚
(analog ground)
1U terminals are automatically configured by the measurement instruction.
TABLE 7-2. Wire Color and Datalogger Connection for the CS240
4-Wire Configuration
Wire
Color Wire Function Datalogger Connection Terminal
White Analog voltage
output
U configured for differential high analog
input1, DIFF H (differential high, analog-
voltage input)
White Reference
U configured for differential low analog
input1, DIFF L (differential low, analog-
voltage input)
Red Voltage
excitation input
U configured for voltage excitation1, EX,
VX (voltage excitation)
Red Analog voltage
output
U configured for differential high analog
input1, DIFF H (differential high, analog-
voltage input)
Black Reference
U configured for differential low analog
input1, DIFF L (differential low, analog-
voltage input)
Black Ground
⏚
(analog ground)
Clear/
Shield Shield
⏚
(analog ground)
1Uterminals are automatically configured by the measurement instruction.
7.3.3 CS240DM Wiring
Connections to Campbell Scientific dataloggers are given in TABLE 7-3. The
wiring for the CS240DM is also available in Device Configuration Utility.