The humidity sensors of the EWHS 300/310 series are designed to be connected to high-accuracy humidity and humidity/temperature measuring de-vices. The EWHS 300 is a humidity measuring device (output signal 4...20 mA) while the EWHS 310 is a humidity and temperature measuring device (two 0...20 mA outputs).

Protection rating: IP65
Mounting: through two external slots
Electrical connections: screw terminals
Dimensions (mm): 80X80X52
Power supply: 9…30 Vc
Power input:
EWHS 300: 20mA max
EWHS 310: 50mA max.
Ambient temperature: -30° (-22°F) to +70°C (158°F)
Ambient humidity: 0…100% RH
Humidity sensor: capacitive
Temperature sensor (EWHS 310 only): Pt100B
Temperature measurement range (EWHS 310 only): -30° (-22°F) to +70°C (158°F)
Humidity measurement range: 0…100% RH
Output current of humidity measurement
EWHS 300: 4 (0%)…20mA (100%)
EWHS 310: 0 (0%)…20mA (100%)
Output current of temperature
measurement
EWHS 310: 0 (-30°C)…20mA (+70°C)
Response time under constant conditions (63%) at 23°C (73.4°F): 30 seconds
Saturation recovery time: 90 seconds
Storage temperature:
-30°C (°F) to +80°C (176°F)
Number of connection wires:
EWHS 300: 2
EWHS 310: 4

Maximum load: 250 Ohm
Humidity measurement accuracy (at 23°C/73.4°F):
EWHS 300:
2% RH (10..95% RH)
3% RH (<10% >95% RH)
EWHS 310:
1.5% RH (10..95% RH)
2% RH (<10% >95% RH)
Temperature measurement accuracy at 0°C (32°F) and 23°C (73.4°F) (EWHS 310 only): 0.5°C (for different temperature values, accuracy is that of Pt100B plus 0.2°C)
Air filter: polyethylene
Reverse polarity protection: by diode
Temperature compensation:
EWHS 300: with NTC
EWHS 310: with Pt100B
Max. air speed: 20m/s