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.
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.
|Measurement Temperature Range||-40° to +135°C|
|Disk Material||Anodized aluminium|
|Surge Protection||1200 V isolation|
|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)|
|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)|
|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)|
|Jacket Material||Black semi-gloss PVC, UL VW-1 sunlight resistant for outdoor use|
|Nominal Wire Diameter||0.61 mm (0.024 in.)|