How often should my pressure gauges be calibrated?
The frequency of instrument recalibration depends on usage and the design of the equipment. The manufacturer of the equipment will publish general recommendations for calibration frequency. For example, instruments such as a spring pressure gauge, which is installed in the piping and is subject to vibration and adverse environmental conditions, may require more frequent calibration.
Image 1 supplies recommendations for calibration periods of some common measurement devices. This data is based on experience with general usage of instruments for testing laboratories.
If historical data exists to support a longer recalibration interval, then it may be acceptable to extend the periods between calibration. If an instrument is physically abused or overloaded, then it should be recalibrated before being used.
Field instrumentation may serve a different purpose than laboratory instrumentation; therefore, the calibration interval could be longer or shorter depending on the application. For example, a field pressure gauge that is only used for visual indication that a pump is operating and is not for testing or control may not need frequent calibration.
For more information in instrument calibration and rotodynamic pumps, refer to ANSI/HI Standard 14.6 Rotodynamic Pumps for Hydraulic Performance Acceptance Tests at www.pumps.org.