SIEMENS Wind Tube Type sensor QFM21 Manual
User Manual
The document introduces Symaro™ duct-type sensor QFM21, which is used to measure relative humidity and temperature. Its features include operating voltage of AC 24 V or DC 13.5-35 V, signal output of DC 0.10 V/4-20 mA for relative humidity and DC 0.10 V/4-20 mA or T1 or LG-Ni 1000 for temperature. The sensor can be used for controlling supply and exhaust air, reference sensors, limit sensors, etc.