What requirements must pressure sensors meet in HVAC?

Patrick Niedenführ
Patrick Niedenführ, January 2018

HVAC systems require high-sensitivity pressure sensors to minimize energy costs and meet regulatory requirements. We'll show you how flow-based sensors reliably measure the smallest differential pressures - even in dusty environments and confined spaces.

Pressure Sensors in HVAC Applications:

  • Flow measurement
  • Channel pressure monitoring
  • Room pressure monitoring
  • Filter monitoring
  • Burner control
  • Leakage detection

Dust exposure

In HVAC applications, sensors are exposed to dust-laden air. This fact can bring serious problems:

  • Dust particles can settle in the inner flow channel of the sensor
  • The pneumatic resistance of the sensor is increasing
  • Sensor output drops
  • Change in sensitivity
  • Loss of calibration
  • Dust particles can block the internal flow channel of the sensor, which can lead to total failure

Micro flow technology of LMI pressure sensors

To counteract these problems, the flow channel of the LMI sensors from First Sensor is integrated in the sensor chip and thus very small. This results in a very high pneumatic resistance comparable to membrane-based differential pressure sensors, where no gas flow at all takes place through the sensor.

Dust does not reach the sensor

This reduces the total amount of dust-laden air flowing through the sensor to an absolute minimum. In addition, the flow rate is greatly reduced, so that the remaining amount of dust settle before it reaches the input of the sensor.

Advantages of dust-proof sensors:

  • LMI sensor has a 1,000 times higher tolerance to dust than comparable sensors
  • Significantly better long-term accuracy and reliability for the end product
  • Sensors need less replacement
  • Extended service intervals, fewer service calls
  • Reduced inspection, maintenance and repair costs

Less maintenance costs for more operational efficiency!

Join the free webinar on "Boost HVAC Efficiency with Ultra-Low-Pressure Sensing" and …

1. … learn about the typical problems of sensors in HVAC applications and find out how the First Sensor micro-flow technology can solve them.
2. … understand the difference between microflow channel design and conventional technology.
3. … learn more about sensitivity, offset long-term stability, dust immunity and versatility.

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In this blog, we write about applications and current topics in sensor technology.


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