RHT Transmitter - The RHT-WM and RHT-DM transmitter series incorporate the best high accuracy
and great stability relative humidity and temperature sensors. They convert the measured values into linear 4 to 20 mA signals and optional 0 to 10 Vdc output can also be offered under request.
The microprocessor based circuit enables full configuration of output range when used with the TxConfig PC interface and the Windows® based software.
The humidity signal can be configured to either relative humidity or dew point output.
The RHT-WM model is dedicated to wall mounted applications and the RHT-DM version is suitable for duct and through-the-wall applications.

Power: from 12 Vdc to 30 Vdc (model 4-20 mA) or 18 to 30 Vdc (model 0-10 V)
Output
Two-wire loop powered 4-20 mA or 20-4 mA
Voltage output: 0-10 Vdc (optional)
Isolation between outputs
Isolated 4-20 mA outputs
Non-isolated 0-10 Vdc outputs
Output load (RL)
Model 4-20 mA: RL (max. in Ohms) = (Vdc – 12) / 0.02
where: Vdc=power voltage in Volts
Model 0-10Vdc: 10 Kohms Minimum
Internal protection against reversed voltage wire polarity
Cable input: PG7 cable gland
Operational Limits
Electronic Module: -10 to +65°C, 0 to 95%RH

Datasheet