LEFOO LFS22 Duct Air Velocity and Volume Transmitter
LEFOO LFS22 Duct Air Velocity and Volume Transmitter is a named LEFOO producer-listed model family. OEM range/signal choices depend on configuration and are not one universal installed SKU.
Original maker specifications and selection codes
| Principle | MEMS differential pressure airspeed / volume duct sensor with screen, no temperature probe assumption |
|---|---|
| Air velocity | 0–30m/s or 0–100m/s ranges, selected range adjustable within family |
| Flow volume | Manufacturer default 0–1,100,000 L/min; custom maximum requires actual order code/duct size |
| Accuracy | ±3% FS airspeed and calculated volume for airspeed ≥3m/s |
| Signal | 0–10V, 4–20mA, RS485/Modbus, configured per model |
| Power | 16–30VDC / 24VAC±20% for dual analog; 12–30VDC for RS485 or two-wire 4–20mA maker options |
| Protection | IP65, 2.4 inch LCD, −20…+70°C operating |
| Maker example | LFS22-1 V10A4 O -XX where the duct cross-sectional area is separately declared |
Original LEFOO LFS22 current model page, specification and ordering information
Source checked on 23 October 2026; model family only, individual SKU, exact photo, Ex and public link crawl QA open.
LFS22 — displayed duct airflow computation
LFS22 is a duct air-velocity/volume transmitter with a display and no guaranteed separate temperature probe. Its volume output depends on entered duct geometry; the maker’s large default L/min volume range should not be reported as universal calibrated volumetric flow. Check the selected 0–30 or 0–100 m/s airspeed class, expected reading near 3 m/s and whether the host receives voltage, current or RS485 data. Dirty taps or a poor duct profile can dominate installed error.