CS240DM PT-1000 Class A, Back of Module Temperature Sensor with Digital Modbus RS-485 Output
Proven Rugged Design
Class A accuracy at any cable length
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications

Overview

The CS240DM is a best-in-class smart sensor with a rugged, surface-mountable platinum resistive thermometer (PRT) that measures back-of-module temperature on solar photovoltaic (PV) panels. The CS240DM includes a new Campbell Scientific precision analog-to-digital, smart-sensor module that makes back-of-module temperature measurements that are among the most accurate measurements available today. 


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Benefits and Features

  • Best-in-class measurement accuracy and technology
  • Modbus RTU RS-485 digital serial communications
  • Precision PT1000 Class A sensing element
  • Compliant with IEC 60751, DIN EN 60751
  • Calibration certification NIST traceable
  • Purchased with any cable length
  • Rugged design proven in over 3,000 installations worldwide

Images

CS240DM
CS240DM
CS240DM
CS240DM
CS240DM and cable (sold separately)
CS240DM and cable attached (sold separately)
CS240DM options
CS240DM mounted to the back of a solar panel module
Kapton tape (pn 11051) is required for cable strain relief. The tape is also used to fasten the sensor to the back of a solar panel when the temperature may exceed 70°C.

Detailed Description

The CS240DM consists of a PT-1000 Class A PRT encased in an aluminum disk. The disk protects the PRT, particularly during installation when pulled through conduit, and promotes heat transfer from the surface while minimizing convective heat loss to the surroundings. An adhesive tab on the disk fastens the CS240DM to the measurement surface. If the temperature may exceed 70°C, Kapton tape is also required to secure the probe.

The precision analog-to-digital, smart-sensor module is based on the CR1000X. The module design is optimized for the Class A PRT that minimizes self-heating and lead-wire resistance. Measurement electronics are surge protected, include 1200 V isolation, and are environmentally protected with a rugged over-molding featuring an IP65 rating. Data is differentially transmitted in cabling that is well suited for industrial energy applications with excellent noise rejection and high voltage, NEC outdoor, UV, UL, and NEC ratings.

The CS240DM provides 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.

Specifications

Measurement Temperature Range -40° to +135°C
Measurement Uncertainty ±0.015°C
Disk Material Anodized aluminium
Surge Protection 1200 V isolation
Compliance Information
  • UL AWM 2586 1000V 105°C approval
  • CSA AWM 600V 105°C FT approval
Conforms with Electromagnetic Compatibility Directive (EMC)
Conforms with the Restriction of Hazardous Substances Directive (RoHS2)
Disk Diameter 2.54 cm (1.0 in.)
Overall Probe Length 6.35 cm (2.5 in.)
Overmolded Joint Dimensions 5.72 x 1.12 x 1.47 cm (2.25 x 0.44 x 0.58 in.)
Weight 90.7 g with 3.2 m cable (0.2 lb with 10.5 ft cable)

Sensing Element

Precision 1000 Ohm Class A platinum sensing element (PT-1000)
Tolerance ± (0.15 + 0.002t)
Temperature Coefficient of Resistance TCR = 3850 ppm/K
Long-Term Stability Maximum Ro drift 0.04% (after 1000 h at 400°C)

Communications

Protocol Modbus RTU protocol (over RS-485)
Format 8 data bits, 1 stop bit, even parity as default (user-configurable)
Baud Rate 19200 bps as default (user-configurable)
Modbus ID Last two digits of serial number as default (user-configurable)

Cable

Description
  • High-flex construction with jacket for pulling through conduit
  • Weld spatter and oil resistant
Jacket Material Black semi-gloss PVC, UL VW-1 sunlight resistant for outdoor use
Agency Approvals
  • UL AWM Style 2463
  • NEC/CEC CMX outdoor
Nominal Wire Diameter 0.61 mm (0.024 in.)


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