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.
41X Low Range Digital Output Pressure Sensor
DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor
100 mbar wet/wet 4 to 20mA differential pressure sensor and display
DPS Low Differential Pressure Transmitter
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.
- 1kPa diff pressure transducer for building air ventilation monitoring
PD33X Digital Differential Pressure Sensor
XMD Process Plant DP Cell Differential Pressure Transmitter
-1 to 6 bar differential RS485 Modbus RTU freshwater pressure sensor for farming use on a 6bar line
Request info on differential pressure measurement products for your application.
15psi dp range 4-20mA air pressure sensor for chamber airflow testing use on a 15psi line
DPS200 HVAC Differential Pressure Transmitter- PD33X High Accuracy Differential Pressure Transmitter
4 x clean rooms pressure, humidity & temperature measurement system
Request info on differential pressure measurement products for your application.