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Determining calibration error of Bourdon tube pressure gauge

How do you calculate maximum gauge error in pressure measurement with a bourdon gauge instrument?

Pressure gauge cardinal pointThe cardinal point or division markings on the dial face of a Bourdon tube pressure gauge can be separated by a large amount making it difficult to read the pressure precisely and therefore it is not possible to read the error directly when applying an exact calibration pressure setpoint.  

When calibrating Bourdon tube type or any other type of analogue dial pressure gauge you should adjust the pressure calibrator so that the applied pressure is set to the cardinal point on the pressure gauge.  The error can then be read to a much higher precision from the calibrator.

Pressure gauge products
  • Data Logging Pressure Gauges
  • Analog Output Pressure Gauges
  • Max / Min Stored Reading Electronic Pressure Gauges
  • DM01 Multi-Range High Accuracy Pressure Gauge

For example a 30 bar gauge with 1 bar incremental marks is calibrated using a 30 bar calibrator with 0.1 bar incremental marks or resolution. To calibrate at the mid point of 15 bar, apply pressure to the gauge until the dial needle is lined up exactly with the 15 bar cardinal point.

Next, note down the pressure on the calibrator, which for this example let’s say is 15.3 bar.  If the calibration was performed the other way around you would have to approximate the 0.3 bar error since there is no markers between 14, 15 and 16 bar.

Once you have collected your bourdon tube pressure gauge calibration readings go to the online calculator below to determine the errors in pressure units or as a percentage of full scale.

Calibration Error Calculator

Pressure gauge products
  • LEX1 (Ei) High Accuracy Digital Pressure Gauge
  • DS200P Sanitary Low Range Pressure Gauge, Switch and Sensor
  • Standard version of LEO Record LEO Record (Ei) Pressure Data Logger
  • Analog Output Pressure Gauges

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