SIEMENS QFM3100 Air Duct Air Temperature and Humidity Transmitter

Product Description

QFM31 Series Air Duct Humidity and Temperature Sensor
Working Voltage: C 24V / DC 13.5...35V
Relative temperature and humidity signal output is DC 0...10 V / 4...20 mA
• High precision throughout the entire measurement range
• With testing function
Capacitance humidity measurement principle
• Measurement Range -40…+70 °C / 0…100 % r. h.
Sensor with LCD display - Application range: -25…+70 °C / 0…100 % r.h.
Usage
QFM31... is designed for HVAC applications that require high accuracy in relative humidity and rapid response times. It measures the entire humidity range of 0...100%.
• Facilities for storage and production in paper, textile, food, chemical, and electronic industries
• Laboratory
• Computer and Electronic Data Processing (EDP) Centers
• Indoor Swimming Pool
• Greenhouse
The QFM31... is used for...
• Sensors for control in blowing or recirculating air
• Steam humidifier followed by a sensor for limiting the maximum dew point of the supply air
• Limited sensors, such as those for measuring values or connecting to building control systems
• Used for measuring enthalpy and absolute humidity, to be used in conjunction with SEZ220
Installation Precautions
Location
The sensor should be mounted at the center axis of the duct. If the sensor shares the same space with a steam humidifier, the minimum distance between them should be 3 meters, and the maximum should not exceed 10 meters.
Install the flange on the duct, then insert the sensor into the flange and tighten it.
Note!
The sealing pad between the housing and base is non-removable; otherwise, the IP 65 protection rating cannot be guaranteed.
• The sensing components within the measuring rod are highly sensitive; avoid excessive vibration and other disturbances during installation.
Installation Instructions
Installation instructions are printed on the sensor's packaging.