Air Velocity Sensor
This sensor is used to control the air velocity to a constant value, balance out pressure
fluctuations (supply or exhaust air control), or to monitor the flow in air ducts. It is
primarily used for modulating fan control in primary applications to set the basic volume
The QVM62.1 Sensor records the air velocity as a measured value and converts it to
an active 0 to 10 Vdc output signal. There are three measuring ranges available:
• 0 to 16 ft/s (0 to 5 m/s)
• 0 to 33 ft/s (0 to 10 m/s)
• 0 to 49 ft/s (0 to 15 m/s).
The sensor measures a point (that is it measures the values at a specific location in the
flow profile. For recording the mean air velocity in the duct, the sensor's immersion
depth is the key measure. The immersion depth depends on the flow profile.
The measurement principle is based on the anemometric measurement principle. The
specially developed thin film sensing element of the QVM62.1 is almost totally
independent from the flow direction and is insensitive to almost any kind of dirt in the
The air velocity sensor consists of:
• Immersion stem with sensor head and sensing element
• Extension pipe with fitting
• Immersion stem end with flow direction arrow
• Adjustable connecting flange
• Connection cable, screened, four-core, 3 feet (1 m) long
Document No. 155-006
October 26, 2006
Siemens Industry, Inc.