33258 CS240DM Replacement Sensor Head with Quick-Connect

Overview

The 33258 is the sensor head of the  CS240DM Pt-1000 Class A, Back of Module Temperature Sensor with Digital Modbus RS-485 Output only, with quick connector. It is generally purchased as a replacement when the user needs a newly calibrated sensor head but doesn't want to replace the entire cable. The quick connector allows the user to replace the sensor head without replacing the entire cable, which could be hundreds of feet in length. The 33258 only works as a replacement for the original CS240DM that was purchased with the -Q option.

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 module, based on CR1000X design, is optimized for the Class A PRT and 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 twisted-pair cabling, which is well suited for industrial energy applications with excellent noise rejection and high voltage, NEC Outdoor, UV, UL, and NEC ratings.

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Benefits and Features

  • Designed and tested to IEC Class 4
  • 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
  • Rugged design proven in over 3,000 installations worldwide

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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. 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 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 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 aluminum
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 113.4 g (0.25 lb) no 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 4 twisted pairs twisted together and wrapped with clear polyester tape to form a cable core
Jacket Material Thermoplastic elastomer, 1.07 mm (0.042 in.) nominal wall thickness (pressure)
Agency Approvals
  • UL AWM 2463 (80C 600V)
  • NEC (UL) TYPE PLTC
  • NEC (UL) TYPE CMX OUTDOOR – CM
  • CEC C(UL) TYPE CMX OUTDOOR – CM
  • PENNSYLVANIA D.E.P. – MSHA
Nominal Wire Diameter 0.61 mm (0.024 in.)
Cable Diameter 5.23 mm (0.206 in.)
Overall Cable Diameter 7.37 mm nominal ± 0.13 mm (0.29 in. nominal ± 0.005 in.)

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