LEFOO LFH21 Indoor Temperature & Humidity Transmitter
Indoor HVAC temperature/humidity transmitter from LEFOO LFH family.
Manufacturer: LEFOO.
Original Manufacturer Documentation
LEFOO official model-code and datasheet index →
The official catalog identifies this model. Check latest detailed datasheet for variant-specific measuring range, output and approval marking; this is not a substitute for verified order code documentation.
LFH21 — indoor RH/temperature with controller options
LFH21 is an indoor temperature/humidity instrument, and the exact sensor/output configuration should be matched to room control requirements rather than copying LFH20’s variants. For building management, confirm RH and temperature channel count, electrical supply, selected register/analog scale and acceptable installation height. Avoid direct sunlight, drafts and cold walls where temperature gradients or condensation undermine accuracy. Manufacturer installation and calibration instructions govern maintenance.
LFH21 — indoor RH and temperature placement
LFH21 belongs to LEFOO’s indoor temperature/humidity transmitter range; confirm the actual RH/temperature output channels, digital protocol or analog setpoints using the ordered model, rather than assuming LFH20 pin compatibility. Temperature gradients at exterior walls or sunlight can bias readings. Check condensation limits, recommended wall mounting height and field calibration before building-control use.
Manufacturer technical specifications — LFH21
| Relative humidity | 0–100% RH; manufacturer accuracy ±3% RH at 20 °C / 20–80% RH |
|---|---|
| Temperature | Digital or passive resistance elements depending variant; digital accuracy approximately ±0.3 °C at 20 °C |
| Outputs | RS-485/Modbus and 0–10 VDC versions (verify selection table) |
| Supply | 15–35 VDC or 24 VAC ±20% on suitable versions |
| Optional controls | Manufacturer lists LCD display, alarm buzzer/LED and relay outputs |
| Housing and environment | PC housing; IP30; −20 to +60 °C working temperature |
These are model-family values published by LEFOO and are not independent test or safety-certification results. Confirm the precise order code, output, materials and installation requirements for the actual supplied variant. Manufacturer model documentation.