Dwyer Omega – Series HHT Hazardous Area Humidity/Temperature Transmitter
Product Code: Series HHT
Manufacturer: Dwyer Omega
The Series HHT Hazardous Area Humidity/Temperature Transmitter takes accurate measurements in the harshest of environments. The explosion-proof model is offered with 4-20 mA output for humidity only. The intrinsically safe version is offered with 4-20 mA output for humidity and temperature, and do require an intrinsically safe barrier to meet hazardous area approvals.
Relative Humidity Range
0 to 100% RH
Temperature Range
-40 to 140°F (-40 to 60°C)
Accuracy
±2% 10-90% RH, ±0.9°F at 72°F (±0.3°C at 25°C)
Hysteresis
±1%
Repeatability
±0.1% typical.
Temperature Limits
-40 to 140°F (-40 to 60°C)
Storage Temperature
-40 to 176°F (-40 to 80°C)
Compensated Temperature
-40 to 140°F (-40 to 60°C)
Power Requirements
For intrinsically safe models HHT-IX, 9.5 to 28 VDC. For explosion-proof models HHT-EX, 16.5 to 28 VDC.
Output Signal
4 to 20 mA, 2 channels for humidity/temperature models (loop power on RH)
Response Time
15 s
Electrical Connections
Screw terminal block
Conduit Connection
1/2 female NPT
Drift
<1% RH/year
RH Sensor
Capacitance polymer
Temperature Sensor
Solid state band gap
Housing Material
Aluminum
Display
Optional 2 line alpha numeric, 8 characters/line. Temperature display is °F/°C selectable
Display Resolution
RH: 0.1%: Temperature 0.1°F (0.1°C)
Weight
2 lb 8 oz (1134 g)
Agency Approvals
FM Approved to: XP-IS / I / 1 / BCD / T5 Ta = -40°C to 60°C, DIP / II, III / T5 Ta = -40°C to 60°C; TYPE 4X, IP66; IS / I, II, III / 1 / ABCDEFG / T4 Ta = -40°C to 60°C – 03-001467-00; ENTITY; TYPE 4X, IP 66; I / 0 / AEx ia / IIC / T4 Ta = -40°C to 60°C – 03-001467-00; ENTITY; TYPE 4X, IP 66, CE.
