Siemens QFM 1660 air duct sensor – Photocell / Sensor Burner / Sensor Api / Flame Sensor

SIEMENS QFM 1660

USE : The QFM1660 is suitable for use with most heating, ventilating, and air conditioning (HVAC) controllers. Common applications for the sensor are ventilation and air conditioning equipment in buildings. FUNCTIONS : Relative humidity The sensor acquires the relative humidity in the air duct via its capacitive humidity sensing element whose electrical capacitance changes as a function of the relative humidity. The electronic measuring circuit converts the sensor’s signal to a continuous DC 0…10 V signal, corresponding to a relative humidity range of 0…100 %. Temperature The sensor acquires the temperature in the air duct via its sensing element whose electrical resistance changes as a function of the temperature. This change in resistance is converted to an active DC 0…10 V output signal corresponding to a temperature range of 0…50 °C. Mechanical design The duct sensor consists of a housing, a printed circuit board, connection terminals and an immersion rod with a measuring tip. The measuring circuit is located on the printed circuit board inside housing, the connection terminals are on the board. The sensing elements are located at the end of the measuring tip and protected by a filter cap on the measuring tip. Cable entry is made via the screwed cable gland M16 supplied with the sensor. Immersion rod and housing are made of plastic and are rigidly connected. The sensor is directly screwed into the duct.

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