The QFM65 duct sensor measures relative humidity and temperature in ventilation and air-conditioning systems. It can be used as control sensor in supply or return air ducts, reference sensor, limit sensor, measurement value display or interface with a building management system.
The Siemens QFM65 duct sensor measures relative humidity and temperature in air‑handling ducts. It operates from an AC 24 V supply and provides separate DC 0‑10 V output signals for humidity (0‑100 % RH) and two temperature ranges (0‑50 °C and –35‑+35 °C).
The manual includes engineering notes, installation requirements, cable‑gland specifications, safety guidelines, and detailed technical data such as accuracy, protection class, and permissible cable lengths. This manual is written in Chinese.