Buraq Integrated Solutions

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 Buraq Integrated Solutions precision analog-to-digital, smart-sensor module that makes back-of-module temperature measurements that are among the most accurate measurements available today. 

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
  • Meets 61724-1 PV System Performance Standard
  • Optional NIST traceable calibration certificate
  • Purchased with any cable length
  • Rugged design proven in more than 4,000 installations worldwide 

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.


SensorPlatinum resistive thermometer (PRT)
System Uncertainty±0.3°C
Disk MaterialAnodized aluminum
Surge Protection1200 V isolation
Supply Voltage of the Sensor5 to 30 Vdc
Power Draw15 mA
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 Diameter2.54 cm (1.0 in.)
Overall Probe Length6.35 cm (2.5 in.)
Overmolded Joint Dimensions5.72 x 1.12 x 1.47 cm (2.25 x 0.44 x 0.58 in.)
Weight90.7 g with 3.2 m cable (0.2 lb with 10.5 ft cable)

Sensing Element

Precision1000 ohm Class A platinum sensing element (Pt-1000)
Accuracy±(0.15 + 0.002T)°C
Temperature Coefficient of ResistanceTCR = 3850 ppm/K
Long-Term StabilityMaximum Ro drift 0.04% (after 1000 h at 400°C)
Operating Temperature Range-40° to +135°C


ProtocolModbus RTU protocol (over RS-485)
Format8 data bits, 1 stop bit, even parity as default (user-configurable)
Baud Rate19,200 bps as default (user-configurable)
Modbus IDLast two digits of serial number as default (user-configurable)


  • High-flex construction with jacket for pulling through conduit
  • Weld spatter and oil resistant
Jacket MaterialBlack semi-gloss PVC, UL VW-1 sunlight resistant for outdoor use
Agency Approvals
  • UL AWM Style 2463
  • NEC/CEC CMX outdoor
Nominal Wire Diameter0.61 mm (0.024 in.)