The QFM66 duct sensor is used to measure relative humidity (high precision) and temperature in ducts. The sensor can be used to control the humidity in supply or return air ducts, or to limit the maximum value of the humidity of the supply air after the steam humidifier.
The QFM66 sensor measures relative humidity (0‑100 % RH) and temperature (0‑50 °C and –35‑+35 °C) in ventilation and air‑conditioning ducts. It outputs two independent DC 0‑10 V signals for each measurement range and complies with EN 60730, EN 61000‑6‑2 and IP65 protection.
The manual covers ordering information, mechanical design, electrical connections, installation guidelines, commissioning steps, and safety requirements. It also lists technical specifications such as power supply (AC 24 V ±20 %), power consumption (≤1 VA), cable length limits, and environmental ratings. This manual is written in Chinese.
| Humidity measurement range | 0 %‑100 % RH |
|---|---|
| Temperature measurement range (signal B2) | 0 °C‑50 °C |
| Temperature measurement range (signal B3) | -35 °C‑+35 °C |
| Power supply voltage | AC 24 V ±20 % |
| IP protection rating | IP65 |
| Sensor head operating temperature range | -40 °C‑+80 °C |
| Maximum cable length (1.5 mm²) | 150 m |
It measures relative humidity from 0 % to 100 % RH.
The minimum distance is 3 m and the maximum distance is 10 m.
It requires an AC 24 V supply with a tolerance of ±20 %.