1. Introduction
The CS240 and CS240DM temperature sensors use a precision 1000 ohm class A platinum
resistance thermometer (PRT) to measure temperature. 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 data loggers. 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 data loggers can use an MD485 multidrop interface to read the
CS240DM output.
NOTE:
This manual provides information only for CRBasic data loggers. The CS240 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
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READ AND UNDERSTAND the
section at the back of this manual.
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Do not use epoxy to secure the sensor head to a PV module.
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Before mounting, the installers need to wash their hands and then clean the back of the PV
module or other device with ethyl alcohol.
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Do not place tape over the sensor molding; only place tape on the metal disk portion of
the sensor.
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Prying the sensor head off will likely damage both the sensor and PV module.
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Proper strain relief of the cable is required after mounting the sensor to the measurement
surface (
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Placement 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.
CS240 and CS240DM PT-1000 Class A, Back-of-Module Temperature Sensors
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