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g Effect

The g Effect is a change in performance of a pressure measuring device that is caused by a change in its orientation.

Typically a pressure sensing device will have some form of flat diaphragm which will generate a change in output when flexed by a change in pressure. If a pressure sensing diaphragm is orientated so that it is horizontal there will be another force acting on it, in addition to the pressure, which is gravity. Irrespective of the pressure applied, the diaphragm will sag slightly in the middle due to the pull of gravity which generates a very slight false pressure reading. If the diaphragm is now flipped upside down it will again sag slightly under its own weight, although this time the false pressure reading will act in the opposite direction causing a zero offset.

The maximum change in pressure reading is limited to 2 x g, where g = 9.80665 m/s², so no change in orientation will generate a force greater than 2g. The amount of offset generated by the g effect will depend on the stiffness of the pressure sensing material.

low range pressure measurement products
  • DM01 Multi-Range High Accuracy Pressure Gauge
  • Baroli 02 Precision Digital Pressure Gauge
  • DMD341 Compact Differential Air Pressure Sensor
  • Low Differential Pressure Transmitters DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor

A high pressure sensing device will tend to have a thicker and smaller surface area sensing diaphragm and therefore will be less sensitive to changes in orientation.

A low pressure sensing device will have a comparably thinner and larger surface area diaphragm and therefore will be more sensitive to changes in orientation.

Manufacturers of low range or high accuracy pressure measurement equipment will often specify the orientation of the device when it it was calibrated, and in some cases a manufacturer will specify the amount of offset to expect from a change in orientation.

In some designs of pressure sensing devices the primary sensing diaphragm is incorporated into an oil filled capsule. In such designs the weight of the oil and the isolating membrane will also contribute to the g Effect.

low range pressure measurement products
  • DMP331P Hygienic Flush Pressure Transmitter
  • DMK351 Liquid and Gas Resistant Intrinsically Safe Low Range Gauge Pressure Sensor
  • Baroli 02 Precision Digital Pressure Gauge
  • DM01 Multi-Range High Accuracy Pressure Gauge

Mechanical Related Terms

More pages related to mechanical technical terms.

  • Al2O3
  • BFSG – Bonded Foil Strain Gauge
  • Bonded Seal
  • Bourdon Tube
  • Burst Pressure
  • Dry Cell
  • Dry/Dry
  • Flush Diaphragm
  • Food Grade
  • g – Acceleration due to Gravity
  • Hygienic
  • Hysteresis
  • Isolation Diaphragm
  • Leak Testing
  • LVDT – Linear Variable Differential Transformer
  • M10 x 1
  • Mechanical Stop
  • Miniature Size
  • MTBF – Mean Time Between Failures
  • OEM Product Design & Development
  • Overpressure Protection
  • Oxygen Service
  • Piezoresistive Strain Gauges
  • Stainless Steel Pressure Sensors
  • Static Line Pressure
  • Submersible
  • Wet/Dry
  • Wet/Wet
  • Wetted Parts
  • Wheatstone Bridge Strain Gauge

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