Telaire T8700

Telaire T8700 Relative Humidity Transmitter

Relative Humidity & Temperature Transmitter

Control of Relative Humidity can help prevent condensation in the building envelope and mechanical systems. Relative humidity can be used to increase comfort levels and save energy by reducing the need to heat or cool the air by a few degrees.

The new transmitter uses Advanced Sensors’ own ChipCap sensor that has very fast response times and long-term stability. The plug in ChipCap sensor module also allows quick and simple field replacement negating the need to replace or return the complete transmitter for recalibration. The transmitter has an accuracy of +/- 2.5% and has standard analog outputs that are all user selectable, they include 0-5 v, 0-10v, and 4-20mA. Temperature measurements can be made by the active signal conditioned output as well as the standard passive 10K Type II thermistor.

The T8700 relative humidity transmitter is available in two sizes to suit the European and US markets as well as display and non-display options. All models are easy to install, through a two-piece enclosure and simple terminal blocks


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  • Precision humidity and temperature transmitter for HVAC control applications
  • Analog outputs 0-5, 0-10V, 4-20mA.
  • Field replaceable humidity/temp sensor.
  • Highly repeatable and stable measurement
  • Field selectable analog output options
  • Standard passive and active temperature outputs.
  • Mounting plate with two-piece terminal blocks provide quick, easy wiring
  • 2 year warranty
  • Euro and US sized available
  • Display and non-display versions available


  • Building automation control
  • HVAC control




Sensing Method

Fully integrated humidity and temperature

Power Supply Requirements

18-30 VAC RMS, 50/60 Hz, or 18 to 42 VDC,

polarity protected

Power Consumption

Typical 0.7 W at nominal voltage of 24V AC RMS

Temperature Dependence

0.2% FS per °C (±0.11% per °F)

Flammability Classification

UL94 5VA

Thermistor Type

NTC 10 K W thermistor (passive)

datasheet available on request.

Operating Conditions

• 32°F to 122°F (0°C to 50°C)

• 0 to 95% RH, non-condensing

Storage Conditions

-40°F to 158°F (-40°C to 70°C)


CE and RoHS compliant

Thermistor Accuracy

±1°C (15° to 35°C)

RH Sensing Element

Capacitive polymer sensor

RH Range

0% to 99% RH (non-condensing)

RH Accuracy (25°C)

±2.5% RH (20 to 80% RH)

±3.5% RH (80% RH)

Active Temperature Range

0 to 50°C

Active Temperature Accuracy

±0.8°C @ 22°C

Warranty Two years
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