4WPB500 500-Ohm, Four-Wire PRT Bridge Terminal Input Module


The 4WPB500 provides completion resistors to enable your Campbell Scientific data logger to measure 500-ohm platinum resistive thermometers (PRT) using the half-bridge four-wire measurement method.

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Benefits and Features

  • Provides high-accuracy completion resistor and convenient wiring for four-wire, 500-ohm PRT measurements
  • Easy to install or remove
  • Connects directly into data logger input terminals
  • Compatible with most Campbell Scientific data loggers


Detailed Description

Four-Wire PRT Bridge Module Schematic
(Rf=500 Ω for the 4WPB500)

4WPB500-to-Sensor Hookup


Used With 500 Ω platinum resistive thermometer (PRT)
Dimensions 1.52 x 1.02 x 2.54 cm (0.6 x 0.4 x 1.0 in.) for body with prongs
Weight 13.6 g (0.03 lb)

Current Limiting

Resistance 10 kΩ
Tolerance ±5% (@ 25°C)
Power Rating 0.25 W

Completion Resistor (bulk metal foil)

Resistance 500 Ω
Tolerance ±0.01% (@ 25°C)
Maximum Temperature Coefficient ±0.8 ppm/°C


Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
21X (retired)
CR10 (retired)
CR1000 (retired)
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR3000 (retired)
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR800 (retired)
CR850 (retired)
CR9000 (retired)
CR9000X (retired)

Measurement and Control

Product Compatible Note
Granite Volt 108
Granite Volt 116

Additional Compatibility Information

Data Logger Considerations

The 4WPB500 uses two adjacent differential analog inputs. The first channel requires an adjacent analog ground channel to accept the "ground prong" of the 4WPB500. Not all data logger terminal strips have this sequence on all channels, so please check your data logger's wiring panel to confirm channel assignments, especially if you plan to use multiple terminal input modules.

Newer CR10X Wiring Panels and the CR10XTCR Thermocouple Cover are deep enough to cover the data logger input channels with a terminal input module attached; older CR10TCRs are not deep enough.


When using CRBasic, the 4WPB500 is measured with the BrHalf4W Instruction followed by the PRT Instruction. When using Edlog, the 4WPB500 is measured with Instruction 9 (Full Bridge w/ Measured Compensation) followed by Instruction 16 (Temperature RTD).

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