Series HHT Hazardous Area Humidity/Temperature Transmitter
-
Brand:DWYER
-
Relative Humidity Range:0 to 100% RH.
-
Temperature Range:-40 to 140°F (-40 to 60°C).
-
Accuracy:±2% 10 to 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 instrinsically 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 seconds.
-
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).
-
Enclosure Rating:NEMA 4X (IP66). Models HHT-EX: FM Explosion-proof, Class I Div. 1 Group B, C, D, Class II Div. 1 Group E, F, G, Class III Div. 1; Models HHT-IX: FM Instrinsically Safe, Class I Div. 1 Group A, B, C, D, Class II Div. 1 Group E, F, G, Class III Div. 1 T4.
-
Agency Approvals:FM, CE.
Description
The SERIES HHT Hazardous Area Humidity/Temperature Transmitter takes accurate measurements in the harshest of environments. The explosion-proof model is offered with 4 to 20 mA output for humidity only. The intrinsically safe version is offered with 4 to 20 mA output for humidity and temperature, and do require an intrinsically safe barrier to meet hazardous area approvals. It is important to develop a routine schedule for replacing the RH/temperature sensor (part number A-451). The sensor should be replaced annually or sooner depending on application conditions.
Product Applications:
- Process monitoring
- Offshore HVAC monitoring
- Dust and grain handling
