The Telaire T8700 Relative Humidity and Temperature Transmitter (part numbers T8700-E, T8700-E-D, T8700 and T8700-D) is a precision humidity and temperature transmitter for HVAC control applications. Accurate, stable humidity and temperature measurement is the basis for controlling ventilation, comfort and condensation risk in conditioned spaces, and inaccurate sensing leads to wasted energy and poor air quality.

The transmitter uses Amphenol Advanced Sensors' own ChipCap sensor, which can be replaced in the field rather than returning the whole unit for recalibration. The capacitive polymer relative humidity element covers 0% to 99% RH non-condensing with an accuracy of plus or minus 2.5% RH from 20 to 80% RH (plus or minus 3.5% RH above 80%). Temperature is read both by an active signal-conditioned output, accurate to plus or minus 0.8 degrees C at 22 degrees C over 0 to 50 degrees C, and by a standard passive NTC 10 K thermistor accurate to plus or minus 1 degrees C between 15 and 35 degrees C.

Analog outputs of 0 to 5 V, 0 to 10 V and 4 to 20 mA are user selectable. Power is 18 to 30 VAC RMS or 18 to 42 VDC with typical consumption of 0.7 W, and a two-piece terminal block simplifies wiring. The Telaire T8700 Relative Humidity & Temperature Transmitter is available in European and US enclosure sizes, in display and non-display versions, is CE and RoHS compliant and carries a two-year warranty. Supplied by BAMR, South Africa's authorised distributor.