Siemens QVM62.1 Air Velocity Duct Sensor

Siemens QVM62.1 Air Velocity Duct Sensor is a duct-mounted device that measures mean air velocity in a ventilation duct and outputs a signal for control or monitoring. It installs through a duct wall using an immersion stem and is sealed with a connecting flange to secure the sensor in place. The QVM62.1 family includes variants such as QVM62.1-HE for heavy-environment applications, as listed by Siemens Industry Mall. The sensor is used in HVAC systems to regulate or monitor airflow in supply and exhaust ducts, and can be employed to maintain a constant setpoint velocity or to compensate for pressure fluctuations in the ductwork. Official datasheets describe the QVM62.1 as a duct air velocity sensor/transmitter designed to convert measured velocity into an electrical signal suitable for building automation systems.