Dwyer Series HHT Hazardous Area Humidity/Temperature Transmitter, Explosion-Proof

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. Applications: Process Monitoring, Offshore HVAC Monitoring, Dust & Grain Handling.

Features

• FM approved explosion-proof and intrinsically safe models
Temperature and relative humidity output models
• Some models include Integral LCD option.

Specifications

• 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 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 electrical
• Connections: Screw terminal block.
• Conduit Connection: 1/2" female
• Updrift:<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 Ratingen 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 Intrinsically 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.

Downloads

Product Manual (PDF Download)