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Dwyer HHT-IT-LCD | Intrinsically Safe RH/Temp Transmitter | 4-20 mA, ±2% RH, LCD
For hazardous areas where a local readout helps, the Dwyer HHT-IT-LCD combines intrinsically safe RH and temperature transmission with an LCD. Its two-line, eight-character LCD reads RH and °F/°C, and an intrinsically safe barrier is needed in the loop.
- 15 s response; drift below 1% RH per year
- IP66 / NEMA 4X aluminium case
- LCD resolution 0.1% RH and 0.1°F (0.1°C)
- Dual 4-20 mA outputs for RH and temperature
- FM intrinsically safe rating for Class I, II, III Div. 1
- Specifications
- Features
- Downloads
| Part Number | HHT-IT-LCD |
| Brand | Dwyer |
| Protection | Intrinsically safe |
| Measures | Relative humidity and temperature |
| Output | 4-20 mA, 2 channels for RH and temperature (loop powered on RH) |
| Power | 9.5 to 28 VDC |
| Display | 2-line alphanumeric LCD, 8 characters/line, °F/°C selectable |
| RH Range | 0 to 100% RH |
| Accuracy | ±2% (10 to 90% RH); ±0.9°F at 72°F (±0.3°C at 25°C) |
| Sensor | Capacitance polymer; temperature: solid state band gap |
| Enclosure | Aluminium, NEMA 4X (IP66) |
| Hazardous Area Rating | FM intrinsically safe Class I Div. 1 Groups A, B, C, D; Class II Div. 1 Groups E, F, G; Class III Div. 1 T4 |
| Operating Temperature | -40 to 140°F (-40 to 60°C) |
| Approvals | FM, CE |
- Explosion-proof and fundamentally safe models with FM approval.
- LCD option integrated.
- Two-way output models for relative humidity and temperature.
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