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 (
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, extreme sealing 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, 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.
FIGURE 5-1. CS240/CS240DM temperature sensor
CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
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