This sensor measures the differential pressure between its two ports. If one port is open to the atmosphere then the sensor measures pressure relative to the atmospheric pressure. With both ports open to the atmosphere, the reading is 0. Blowing into one port will produce a positive value, whereas blowing into the other port will produce a negative value.

This sensor has a very sensitive range and is suitable for a number of Biology experiments e.g. as a manometer, investigating the uptake of oxygen by maggots or breathing rate.

For breathing rate investigations this sensor is connected to a Breathing Rate Belt.


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  • Experiments involving a Manometer
  • Breathing rate (with Breathing Rate Belt 3190)
  • Production of gases in an enclosed atmosphere (O²) during photosynthesis of an aquatic plant
  • Osmosis investigations
  • Rate of Transpiration investigations


  • Range 1: ± 10 kPa (Resolution: 0.01 kPa)
  • Range 2: ±1.5 psi (Resolution: 0.001 psi)

The Differential Gas Pressure sensors have 2 ports.

The external diameters of the ports are tapered from 4 to 4.3 mm.

The sensor element has automatic internal temperature compensation so that changes in room temperature do not affect readings

A Gas Pressure Tubing Accessory pack (3138) is available which contains PVC tubing, pipettes, connectors, stopcocks and a syringe.

Works with the following Dataloggers:

VHub4 and VHub8


Gas Pressure Differential

  • ±10kPa (Resolution 0.01kPa)
  • ±1.5psi (Resolution 0.001psi)