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Series HHT Hazardous Area Humidity/Temperature Transmitter

Intrinsically Safe or Explosion-Proof Models
Series HHTThe Series HHT Hazardous Area Humidity/Temperature Transmitter takes accurate measurements in the harshest of environments. The transmitter is offered in explosion-proof and intrinsically-safe versions depending on the application's requirements. 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. Both versions have an optional two line alphanumeric display to show the current humidity and temperature.

The Series HHT humidity/temperature transmitter is excellent for offshore HVAC applications, dust and grain applications. Intrinsically safe models require an intrinsically safe barrier.

Specifications:
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 instrinsically safe models HHT-IX, 9.5 to 28 VDC. For explosion-proof models HHT-EX, 16.5 to 28 VDC.
Output Signal: 4-20 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).
Weight: 2 lb 8 oz (1134 g).
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.
Popular Models
Model Number Description Usually Ships
HHT-EU Explosion-proof humidity transmitter. Same Day
HHT-EU-LCD Explosion-proof humidity transmitter with LCD display. Same Day
HHT-IU Intrinsically safe humidity transmitter. Same Day
HHT-IT Intrinsically safe humidity/temperature transmitter. Same Day
HHT-IT-LCD Intrinsically safe humidity/temperature transmitter with LCD display. Same Day
Accessories:
Model Number Description Usually Ships
A-451 Replacment 2% sensor. 1-2 Weeks
KFD0-SCS-EX1.55 Loop powered galvanic isolator for use with intrinsically safe transmitters. Same Day
A-287 Mounting bracket for pipe or surface mounting (includes bracket and two 2" U-bolts). Same Day
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