Pressure Sensors, Flow Sensors and Switches

Pressure Sensor, Flow Sensor and Switch

Reliable pressure and flow sensors for all HVAC systems.

Our wide range of pressure sensors and flow sensors combine well-proven technology and extensive testing to provide you with accurate, reliable, maintenance-free functionality. We offer sensors for measuring both pressure and differential pressure to meet the needs of the air and water side of HVAC systems.

Differential Pressure: Siemens Air Differential Pressure Sensors provide years of maintenance-free measuring accuracy. They deliver temperature-compensated sensor signals for registering airflow in HVAC systems and for measuring differential pressures in environmental, laboratory, and cleanroom applications.


Air Velocity: The QVM62.1 Air Velocity Sensor/Transmitter is used to control the air velocity to a constant value, balance out pressure.

The Siemens QBE Series Wet Differential Pressure Sensors utilize a well-proven ceramic technology making them an ideal choice across a broad spectrum of applications. These sensors can be ordered individually or pre-assembled with an optional three-valve manifold.

The 7MF Series single point pressure sensors can be used at any point in the HVAC system.

The QVE1900 Series Flow Switches are used in HVAC installations to monitor the flow of fluids in hydronic heating and cooling systems. General purpose liquid flow switch with SPDT contacts.

Differential Pressure:

  • High degree of measuring accuracy
  • Selectable measuring range
  • Selectable output


Air Velocity:

  • Selectable measuring ranges for optimum accuracy
  • 0-10V or 4-20mA output (selectable)
  • Thin film anemometer is less susceptible to contamination from dust particles
  • Available in 3 measuring ranges
  • Fully assembled with 3 valve manifold (optional configuration)
  • 4-20mA loop powered 2 wire signal
  • 0-10V or 4-20mA output
  • Measuring ranges up to 300 PSIG
  • SPDT output
  • May be wired NO or NC
  • Trimmable paddle for use with different pipe diameters
Differential Pressure:
  • Integrated mounting bracket for simple installation
  • Excellent long-term stability for maintenance free operation
  • Calibrated and temperature-compensated measuring signal
  • LCD display


Air Velocity:

  • Graduated probe ensures maximum flow accuracy.
  • Flow directional arrow provides for the most accurate reading.
  • Connection cable provides mounting flexibility
  • Easy installation
  • Maintenance free
  • Factory pressure tested with manifold
  • Easy installation
  • Temperature compensated measuring element for consistent accuracy
  • Suitable for pipe sizes up to 8” diameter
  • Adjustable trip point for optimum performance
Differential Pressure:
  • Monitor fan performance or room pressurization
Air Velocity:
  • Typically used to monitor intake air to ensure compliance with ASHRAE standard 62.1
  • Measure differential pressure in hydronic HVAC systems
  • Deployed throughout the HVAC system to monitor pressure of liquids and non-corrosive gasses
  • Typically used to verify flow / no-flow conditions in hydronic HVAC systems

Want to install reliable products? 

Siemens offers a 5-year warranty on valves, actuators, damper actuators, sensors, thermostats and meters.

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QBM3230 Differential Pressure Sensors

NEW QBM3230 Differential Pressure Sensors

The QBM3230 sensors are designed to measure differential pressure on the air side of an HVAC system. With both selectable measuring ranges and selectable output signals, fewer part numbers are needed to support a wider application coverage. Rugged polycarbonate housing features an integrated mounting bracket and high strength barbed connections for standard ¼” tubing.

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