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HHT-EU-LCD | Explosion-proof humidity transmitter with LCD display. | Dwyer

Explosion-proof humidity transmitter with LCD display.

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Overview

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Explosion-proof humidity transmitter with LCD display.

Series HHT Hazardous Area Humidity/Temperature Transmitter

Intrinsically Safe or Explosion-Proof Models

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.

Product Applications

Process monitoring
Offshore HVAC monitoring
Dust and grain handling

FM approved explosion-proof and intrinsically safe models
Integral LCD option
Dual temperature and relative humidity output models

Specifications

Series: HHT Hazardous Area Humidity/Temperature Transmitter
Category/Type: Air Quality
Type: Humidity / Temperature Transmitters
Series: HHT Hazardous Area Humidity/Temperature Transmitter
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 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).
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.