HD9008T…-HD9009T… Series – Meteorological Temperature and RH Transmitter

The HD9008…and HD9009… series are single block RH and temperature (or only temperature) microprocessor transmitters, temperature configurable.

They are available in different versions:

• HD9008TRR: 2-wire with 4…20 mA output for RH and temperature
• HD9008T7AC: 2-wire with 4…20 mA output (only temperature)
• HD9008T7S: with RS485 MODBUS-RTU output (only temperature)
• HD9009TRR: 0…1 V standard voltage output (other ouputs available on demand) for RH and temperature

SENSORS
The humidity sensor is a capacitor which dielectric is made up by an hygroscopic polymer.

As water dielectric constant is approximately 80, you’ll get a strong change in capacity as the humidity content of this polymer changes.

The advantages of this kind of sensor are:

• good linearity,
• insensitivity to temperature changes,
• fast response time
• long-lasting life.

HD9008.1 , HD9008T7AC , HD9008T7S , HD9008TRR , HD9008TR.2 , HD9009TRR , HD9009TR.1 , HD9009TR.2