Campbell CS241 User manual

Revision: 05/2021

Campbell Scientific, Inc.

Table of contents

1. Introduction 1

2. Precautions 1

3. Initial inspection 1

4. QuickStart 2

5. Overview 4

6. Specifications 6

7. Installation 7

7.1 Circuit diagrams 8

7.2 Wiring 9

7.3 Data logger programming 11

7.3.1 Resistance measurement and conversion to temperature 12

7.4 Placement on a photovoltaic (PV) module 13

7.5 Mounting/cable strain relief 13

7.5.1 Adhesive mounting strip 13

7.5.2 Cable strain relief 13

7.5.3 Extreme sealing tape 15

7.6 Cable resistance/long cable lengths 16

7.7 Electrical noisy environments 17

8. Maintenance and troubleshooting 18

8.1 Maintenance 18

8.2 Troubleshooting 18

Appendix A. Importing Short Cut code into CRBasic Editor 19

Appendix B. Sensor material properties 20

B.1 3M F9473PC adhesive 20

Table of Contents - i

1. Introduction

The CS241 temperature sensor uses a precision 1000 ohm Class A platinum resistance

thermometer (PRT) to measure temperature. It is designed for measuring the back-of-

photovoltaic (PV) module temperature but also can be used to measure the surface temperature

of other devices. The CS241 can be measured with a 2-wire or 4-wire configuration and is

compatible with most Campbell Scientific data loggers.

NOTE:

This manual provides information only for CRBasic data loggers. The sensor is also

compatible with our retired Edlog data loggers. For Edlog data logger support, contact

Campbell Scientific. Support for Edlog data loggers is no longer free; see

www.campbellsci.com/news-edlog-retiring for more information.

2. Precautions

lREAD AND UNDERSTAND the Safety section at the back of this manual.

lDo not use epoxy to secure the sensor head to a PV module.

lBefore mounting, the installers need to wash their hands and then clean the back of the PV

module or other device using the isopropyl alcohol pad shipped with the sensor.

lPrying the sensor head off will likely damage both the sensor and PV module.

lProper strain relief of the cable is required after mounting the sensor to the measurement

surface (Mounting/cable strain relief (p. 13)).

lPlacement of the cable inside a rugged conduit is advisable for cable runs over 4.5 m (15 ft),

especially in locations subject to digging, mowing, traffic, power tools, animals, or lightning

strikes.

3. Initial inspection

lUpon receipt of the sensor, inspect the packaging and contents for damage. File damage

claims with the shipping company.

CS241 PT-1000 Class A, Back-of-Module Temperature Sensor1

lThe model number, cable length, and cable resistance 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, or PC400.

The following procedure also shows using Short Cut to program the CS241.

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 CS241. You can also locate the sensor in the

Sensors > Temperature folder. Double click the sensor model. The surface temperature

defaults to degree C. This can be changed by clicking the Temperature box and selecting

one of the other options. If using the 2-wire configuration, type the Cable Resistance. This

value is unique for each sensor, and is printed on the heat shrink label attached to the

sensor cable.

CS241 PT-1000 Class A, Back-of-Module 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.

CS241 PT-1000 Class A, Back-of-Module 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

logger support software data display in LoggerNet, RTDAQ, or PC400 to make sure it is

making reasonable measurements.

5. Overview

The CS241 is a surface mountable platinum resistive thermometer (PRT) that measures back-of-

module temperature for solar energy applications. It uses a precision PT-1000 Class A PRT to

provide the highest level of accuracy. To withstand the harsh treatment that commonly occurs

with meteorological station installation, the sensing element is safely housed inside a specially

designed self-adhesive aluminum disk (FIGURE 5-1 (p. 5)).

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.

The CS241 provides PV stakeholders with highly accurate back-of-module temperature, even at

long cable lengths, 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.

CS241 PT-1000 Class A, Back-of-Module Temperature Sensor4

FIGURE 5-1. CS241 temperature sensor

Benefits and features:

lDesigned for optimal performance on bifacial PV module

lEasy installation with maximum sensor-to-module bonding strength and smaller profile

lNIST-traceable, serialized calibration certificate supplied with every sensor

lMeets or exceeds IEC 61724 Class A performance specifications

lPrecision PT-1000 Class A sensing element

lCompliant with IEC 60751, DIN EN 60751 (according to IEC 751)

lSuitable for use on floating PV arrays

lSlim design to minimize sensor impact on bifaciality (<2% of full-size cell area)

lThermal conductance greater than 600 W/(m2 K)

lMaximum sensor-to-module bonding

lHigh temperature rating to 150 °C

lUser-selectable and standard cable lengths offered

l2-wire or 4-wire configurations to satisfy accuracy even at long cable lengths

lCompatible with Campbell Scientific CRBasic data loggers: CR6, CR3000, CR1000X, CR800

series, CR300 series, CR1000

CS241 PT-1000 Class A, Back-of-Module Temperature Sensor5

6. Specifications

Sensor: Precision 1000 ohm Class A platinum sensing element

Class A sensor accuracy: ± (0.15 + 0.002t) °C

Operating temperature range: –40 to 150 °C

Temperature coefficient: TCR = 3850 ppm/K

Long-term stability: Maximum R0 drift = 0.04% after 1000 hours at 400 °C

Measuring current: 0.1 to 0.3 mA

Temperature uncertainty: ±(0.3 to 0.4 °C) for the –40 to 100 °C measurement range

when using the CR1000X data logger

Disk diameter: 2.54 cm (1.0 in)

Height: 0.419 cm (0.165 in)

Disk material: Anodized aluminum

Weight: ~27 g (0.06 lb) with 1 m (3 ft) cable

Approvals: Conforms with the Restriction of Hazardous Substances

Directive (RoHS2)

Compliance: View compliance documents at:

www.campbellsci.com/cs241

 Meets or exceeds IEC 61724 Class A performance

specifications

Industrial standards: Compliant with IEC 60751, DIN EN 60751,

Industrial Design (IEC Class 4) (according to IEC 751)

IP rating: IP68 rating (self certified): 1 m (3 ft) submersion for 90

minutes

EMC compliance: Conforms with Electromagnetic Compatibility Directive

(EMC)

RoHS2: Conforms with Restriction of Hazardous Substances

Directive (RoHS2)

POE compliance: POE compliant (802.3af) to 100 meters when installed per

recommendations in TIA TSB-184

CS241 PT-1000 Class A, Back-of-Module Temperature Sensor6

CAT5e: Cable will meet CAT5e channel requirements to 100 meter

length

Sensor cable (sensor head-to-M12 connector)

Cable diameter: 0.216 cm (0.085 in)

Cable length: 0.9 m (3 ft)

Jacket material: White semi-gloss perfluoroalkoxy (PFA), insulated

Jacket rating: –75 to 250 °C

Minimum bend radius: 6 mm (0.25 in) at least 6 mm (0.25 in) away

from sensor disk

Connector: Circular plastic M12 , male 8-pin connector

Main cable (M12 connector to pigtail)

Cable diameter: 0.622 cm (0.245 in)

Jacket material: Black semi-gloss polyvinyl chloride (PVC), UL VW-1

sunlight resistant for outdoor use

UL: AWM 10012 1000V 105 °C

7. Installation

If you are programming your data logger with Short Cut, skip Wiring (p. 9) and Data logger

programming (p. 11). Short Cut does this work for you. See QuickStart (p. 2) for a Short Cut

tutorial. This section discusses the following:

7.1 Circuit diagrams 8

7.2 Wiring 9

7.3 Data logger programming 11

7.4 Placement on a photovoltaic (PV) module 13

7.5 Mounting/cable strain relief 13

7.6 Cable resistance/long cable lengths 16

7.7 Electrical noisy environments 17

CS241 PT-1000 Class A, Back-of-Module Temperature Sensor7

7.1 Circuit diagrams

FIGURE 7-1 (p. 8) provides the circuit diagram for the 2-wire configuration. FIGURE 7-2 (p. 8)

provides the circuit diagram for the 4-wire configuration.

FIGURE 7-1. 2-Wire Circuit Diagram

FIGURE 7-2. 4-Wire Circuit Diagram

CS241 PT-1000 Class A, Back-of-Module Temperature Sensor8

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