3WHB10K 10-kohm, Three-Wire Half-Bridge Terminal Input Module

Overview

The 3WHB10K provides the completion resistor required for a three-wire half-bridge measurement. It is typically used with 100 Ω and 1000 Ω platinum resistive thermometers (PRTs).

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Benefits and Features

  • Makes accurate measurement of 3-wire half bridges simple
  • Easy to install or remove
  • Connects directly into data logger input terminals
  • Compatible with most Campbell Scientific data loggers

Images

Technical Description

3WHB10K Schematic 

3WHB10K-to-Sensor Hookup

Specifications

Used With 100 Ω or 1 kΩ platinum resistive thermometer (PRT) or other 3-wire half bridge
Resistance 10 kΩ (bulk metal foil)
Tolerance ±0.01% (@ 25°C)
Maximum Temperature Coefficient ±0.8 ppm/°C
Power Rating 0.25 W (@ 70°C)
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)

Compatibility

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

Dataloggers

Product Compatible Note
CR1000 (retired)
CR200X (retired)
CR216X (retired)
CR300
CR3000
CR310
CR350
CR5000 (retired)
CR6
CR800 (retired)
CR850 (retired)

Miscellaneous

Product Compatible Note
CR9050 (retired)

Additional Compatibility Information

Multiplexers

The AM16/32-series and AM25T multiplexers are compatible with the 3WHB10K.

Data Logger Considerations

The 3WHB10K uses two adjacent single-ended analog inputs; an adjacent analog ground channel accepts the "ground prong" of the 3WHB10K. 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 can accommodate both the 3WHB10K and the cover associated with the CR10XTCR (reference thermistor for thermocouple measurements). Specifically, the physical configuration of the thermocouple cover, the data logger input terminals, and the terminal input modules allow sufficient room for the cover to be used with a Terminal Input Module attached. In contrast, older CR10TCRs are not deep enough.

FAQs for

Number of FAQs related to 3WHB10K: 3

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  1. Is a 3WHB10K needed to connect five three-wire temperature probes to an AM16/32B

    Yes. The 3WHB10K is required to measure three-wire temperature probes on the AM16/32B. As both RTDs and thermistors can be measured on the 3WHB10K, refer to the AM16/32B Relay Multiplexer Instruction Manual for the proper programming.

  2. Can three-wire PT100 sensors only be used with three-wire half-bridge modules, or can they also be used with four-wire half-bridge modules?

    The 4WPB100, 4WPB1K, and 4WHB10K terminal input modules can be used instead of the 3WHB10K module. However, ensure that the jumper is installed between the ground side of the sensor and the low input of the second channel to maintain the four-wire accuracy.

  3. Can eight PT100 sensors be connected to a CR1000 using a 3WHB10K?

    Yes. The CR1000 can measure eight PT100 sensors with a 3WHB10K terminal input module. The measurement instructions, however, have to reflect that more than one sensor is being excited with the same excitation channel (MeasPEx argument) in the BrHalf() or BrHalf3W() instruction.

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