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.

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 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.