The RH sensor used in the equipment may be damaged or descalibrated when exposed to contaminated atmospheres or chemical agents. Hydrochloric, nitrous or sulphuric acid or ammonia in high concentrations may damage the sensor. Acetone, ethanol and propylene glycol may cause reversible measuring errors.FEATURES & SPECIFICATIONS RELATIVE HUMIDITY, DEW POINT & TEMPERATURE - RHT WM-DM INTRODUCTION 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.

Humidity Transmitter
Output resolution: 0.022 mA (4-20 mA) or 0.015 V (0-10 V)
Accuracy: refer to diagram
Repetibility: ±1%RH
Histeresis: ±1%RH
Non-linearity: <<1%RH
Stability: <1%RH per year
Range: programmable anywhere from 0 to 100%RH or
from –100 and 103 °C for dew point
Response Time: 4 s in fairly still air
Temperature Transmitter
Output resolution: 0.006 mA (4-20 mA) or 0.003 V (0-10 V)
Accuracy: refer to diagram
Repetibility: ±0.1°C
Range: programmable between -40 and 120 °C
Response time:up to 30 s in fairly still air

General Features
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:
- Sensor and Probe (RHT-DM): refer to diagram below
- Electronic Module: -10 to +65 °C, 0 to 95%RH