LEFOO · HUMIDITY TRANSMITTERS

LEFOO LFH71 Intrinsically Safe Temperature & Humidity Transmitter

LEFOO LFH71 original intrinsically safe humidity transmitter manufacturer model photograph
Original LEFOO LFH71 with integrated humidity probe (one manufacturer configuration; other remote probes differ). Official manufacturer model. Marketing-specified gas/dust zones still require current matching IECEx/ATEX annex for installed order code.

Intrinsically-safe temperature/humidity transmitter with gas and dust hazardous-area variants, 4–20mA two-wire outputs and digital sensing.

Manufacturer: LEFOO

EX-PROOF / HAZARDOUS AREA — MANUFACTURER-DECLARED

Ex ia IIC T6/T4 Ga (gas) / Ex ia IIIC T200 85°C or T200 135°C Da (dust variant), manufacturer-reported certificate CE24.2060X.

Verify current original certificate, exact Ex marking, ambient limits, entity parameters, hazardous-area zone and order code before specifying a device. AirAlign does not certify equipment.

Official Documentation

Open manufacturer technical source →

The official material may cover several option codes. Confirm live availability, output configuration, safety marking and exact variant with the manufacturer.

LFH71 — intrinsic-safety humidity/temperature channels

LFH71 has intrinsically safe temperature and humidity variants, but the gas and dust protection markings refer to distinct certificate conditions. Specify an approved barrier, electrical entity parameters, sensor cable and actual probe assembly as a whole. Calibrate RH and temperature channels separately and check whether the reading element is safe against condensation or chemical washdown. A visual match with ordinary LFH20/LFH21 models does not establish wiring or zone equivalence.

LFH71 — intrinsically safe RH/temperature

LFH71 monitors temperature and humidity in manufacturer-described intrinsically safe configurations; the protective circuit must include matched energy-limiting interfaces and approved probe/cable combinations. Relative-humidity accuracy, condensation behavior and temperature output require separate commissioning. Match the specific gas/dust protection marking and barrier entity parameters from a current approved certificate for the order suffix.