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Measuring negative pressure using a positive differential pressure range

How can you use a differential pressure measurement device to measure a negative pressure if it has been factory configured to measure a positive pressure range without making any adjustments to the electronics or the signal output?

Finding a pressure sensor to read negative pressure can be difficult since the vast majority of pressure measurement devices are only available with positive ranges as standard, since most applications require a positive pressure range, and therefore manufacturers understandably focus on the most popular pressure ranges for their product range.

Although manufacturers will often consider a custom configuration for measuring negative pressure, this could cause a delay to delivery and an extra cost compared to the standard pressure range configuration.

Differential pressure measurement products
  • DPS Low Differential Pressure Transmitter 0.1 inH2O differential range 0-10Vdc output between rooms air pressure sensor
  • 1 psi delta air pressure sensor with 0 to 10 volt output
  • Single differential versus twin absolute pressure sensor for measuring dp
  • 20 kPa negative differential range air pressure gauge and sensor with tubing fitting

Request info on differential pressure measurement products for your application.

There is a much simpler and convenient solution to measuring negative pressures. A differential pressure measurement device has two separate pressure connections so that the difference in pressure between the two connections can be measured. One connection will be marked as High (Hi) or Positive (+), and the other as Low (Lo) or Negative (-).

Typically when measuring positive pressures, the Low side connection would be open to ambient air pressure, and the High side connection would be connected to the positive pressure to be measured.

If you want to measure negative or suction pressure instead, you can reverse the connection, so that the High side connection is open to ambient air pressure, and the Low side connection is connected to the vacuum pressure. As the vacuum increases, the greater will be the difference in pressure between the Low and High side.

As an example, a 0 to +100 mbar differential pressure range will become a 0 to -100 mbar differential pressure range simply by reversing the connections.

Differential pressure measurement products
  • Clean Room Monitor for Air Differential Pressure, Temperature and Humidity – PMDS4
  • 100mbar dp range 0-5Vdc amplified output air pressure sensor for aerospace research test rig use
  • Clean room temp, RH and pressure monitoring
  • Low range ATEX approved 100 Pascal range DP transmitter

Request info on differential pressure measurement products for your application.

Measuring negative pressure using a positive differential pressure range

Differential pressure measurement products
  • -15psig 0-10V out negative pressure transducer and display for air extraction use
  • DPS Low Differential Pressure Transmitter Differential Pressure Voltage Output Transducers
  • 1 inH2O differential intrinsically safe 4-20mA out air pressure sensor for HVAC use
  • 1 psi delta air pressure sensor with 0 to 10 volt output

Request info on differential pressure measurement products for your application.

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Product Selection Guides

  • Differential Pressure Sensors
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Application Selection Guides

  • Absolute Pressure
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  • Flush Diaphragm
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  • Leak Testing
  • Low Pressure Range
  • Oxygen Service
  • Submersible
  • Vacuum

Help Guides

  • Using absolute pressure sensors to measure hydrostatic level
  • Measuring vacuum with negative gauge or absolute ranges
  • Measuring the difference in air pressure between rooms
  • What does negative and positive gauge pressure mean
  • Measuring the Pressure of Hot Media
  • Determining water tank volume using hydrostatic pressure
  • How to get a 10 volt signal from a 4-20mA output pressure sensor

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