4WPB100 100 Ohm, 4-Wire PRT Bridge Terminal Input Module

Overview

The 4WPB100 provides completion resistors that allow our dataloggers to measure a 100 ohm platinum resistive thermometer (PRT).

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Benefits and Features

  • Makes accurate measurement of 100-ohm PRTs simple
  • Easy to install or remove
  • Connects directly into data logger input terminals
  • Compatible with most Campbell Scientific data loggers

Images

Technical Description

4-Wire PRT Bridge Module Schematic
(Rf=100 Ω for the 4WPB100)

4WPB100-to-Sensor Hookup

Specifications

Used With 100 Ω platinum resistive thermometer (PRT)
Dimensions 1.5 x 1.5 x 2.7 cm (0.6 x 0.6 x 1.0 in.) for body with prongs
Weight 6 g (0.2 oz)

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

Completion Resistor (bulk metal foil)
Resistance 100 Ω
Tolerance ±0.01% (@ 25°C)
Maximum Temperature Coefficient ±0.8 ppm/°C
Power Rating 0.25 W (@ 70°C)

Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
21X (retired)
CR10 (retired)
CR1000 (retired)
CR1000X
CR10X (retired)
CR200X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR300
CR3000 (retired)
CR310
CR350
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR6
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 4WPB100 uses two adjacent differential analog inputs; the first channel requires an adjacent analog ground channel to accept the "ground prong" of the 4WPB100. 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.

Programming

When using CRBasic, the 4WPB100 is measured with the BrHalf4W Instruction followed by the PRT Instruction. When using Edlog, the 4WPB100 is measured with Instruction 9 (Full Bridge w/ Measured Compensation) followed by Instruction 16 (Temperature RTD).

Related FAQs

Number of FAQs related to 4WPB100: 2

  1. When a 4-way net radiometer is used, which dataloggers require the use of a 4WPB100 to measure the internal PRT?

    The CR1000 requires a 4WPB100 to measure the internal PRT. (Dataloggers such as the CR3000 and CR5000 have the necessary PRT bridge module built in to measure the PRT.) Note that the CNR4-L also includes an internal thermistor, which can be directly measured by the CR1000. Because of this, when using a CR1000, Campbell Scientific typically recommends monitoring the CNR4-L’s internal temperature using its internal thermistor instead of the PRT. 

  2. How many 4WPB100s are needed to measure the internal PRT in an NR01-L, CNR4-L, or CNR1-L 4-way net radiometer?

    Only one 4WPB100 is needed to measure the internal PRT in the radiometer.

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