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Capacitive RH Sensor - G-Cap-U

Supplier: GE Sensing

The GE Industrial Systems' G-CAP&template; 2 Relative Humidity Sensor is a low-cost, polymer capacitive based sensor, factory calibrated to within 1 picofarad (pf), +/- 3% RH accuracy.


The result is an RH sensing element with uniform calibration and interchangeability among sensors of better than 3% RH.

Competitive RH sensors, in contrast, have varied by as much as 40% from unit to unit.

These wide variances require time-consuming calibration that adversely affects manufacturing costs and scheduling.

For this reason, the G-CAP&template; is ideally suited for high volume applications, reducing the time required for final assembly and production calibration.

Savings can also be appreciated from the simple and low-cost circuitry required for the G-CAP&template; sensor.

The G-CAP's performance in field applications offers an important advantage over other RH sensors.

The unique properties of its humidity sensing polymer film allow the sensor to operate and survive when exposed to 100% RH condensing environments.

These environments will often affect other sensors, leading to an increased drift rate and sometimes sensor failure.

The G-CAP sensor offers low drift performance of less than 1% per year, typical.

As a result, OEM's can anticipate fewer failures and lower costs associated with replacement sensors and calibration services.

The G-CAP&template; 2 sensor also features a negligible temperature coefficient of less than 0.05% RH/º, thus insuring accurate and reliable operation in applications where the final product will be exposed to wide temperature ranges.

Ideally suited for high-volume OEM applications, the G-CAP 2 sensor can be used in automotive, data-loggers, consumer appliances, residential HVAC controls, medical instrumentation, etc.

The sensing element consists of a proprietary electrode metallization deposited over the humidity sensitive polymer.

This allows rapid diffusion of water vapor, which speeds up drying and makes recalibration easy.

The properties of the film allow the sensor to survive total immersion in water with no loss of accuracy.

Unlike competitive designs where contacts are on active sensing surfaces causing a degradation of performance, the G-CAP&template; contacts are unique in that their terminations are non-active electrodes, thus ensuring continual performance and reliability.

Every G-CAP&template; 2 Sensor is measured and calibrated in a controlled, NIST-traceable RH environment.

Calibration chambers, equipment, facilities, and processes are in compliance with MIL-STD 45662/A, Nuclear Regulation 10CFR Part 21, and ISO9001.

GE Industrial Systems' also offers a G-CAP&template; Relative Humidity Sensor Evaluation Kit.

This kit includes five G-CAP&template; sensors and a PC board with a 0-5 volt output.

The PC board features plug-in connectors which allow an engineer to evaluate each G-CAP&template; sensor without the need to design and build special test circuits.

The kit includes full documentation that offers helpful hints on what to test for and how to devise some simple tests.

Features & Benefits of Capacitive RH Sensor - G-Cap-U:

  • Interchangeability better than 3%
  • Survives 100% RH
  • Temperature coefficient less than 0.05% RH/ºF
  • Linearity better than +/-2%
  • Innovative packaging for improved performance
  • Economical
  • Alternative mounting configurations
  • Calibrated or uncalibrated versions

For further information about the Capacitive RH Sensor - G-Cap-U visit GE Sensing at
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