Air pressure gauge calibration




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  • A Guide to Pressure Gauge Calibration. A pressure gauge can be calibrated with a standard pneumatic calibrator, a dead weight tester or any other suitable.

    When maintaining a car, calibrating a tire pressure gauge is quite important. Misreading may lead to technical difficulties like a blown tire.

    Pressure calibration unit that works with air for calibrating air pressure gauges up to psi. This calibration tool only uses air to generate pressure as opposed.

    Applied pressure — pointer on segment of the unit under test. The Representative APR is The class indicates the allowable percentage error of the full-scale value of the gauge. A large number of different pressure unitgs are being used around the world.

    Pressure Gauge Calibration Services | Transcat

    Basic pressure gauge calibration is the comparison of measurement values of a unit under test your gauge with those of a more accurate calibrated reference instrument. The term calibration means just the act of the comparison and the recording of noted values on a certificate. It does not normally include corrective adjustment. The outcome of the comparison can result in the following three reports:.

    When adjustments are made, the before and after values should be indicated. The purpose of calibration is to maintain the quality and accuracy of measurement and to ensure the proper working of a particular instrument. Even the highest quality instruments are subject to drift over time, resulting in inaccurate measurements and substandard performance. It is very important that all instruments are calibrated by trained, competent and approved personnel.

    Calibration intervals and error limits should be defined and records of the calibration results should be kept, maintaining instrument integrity.

    Neglecting calibration can result in unplanned production downtime, inferior products, or process quality issues. In addition, allowing instruments that are critical to the process to drift out of specification could potentially result in a risk to employee safety.

    The cost of calibration is normally insignificant compared to the potential production or injury costs. Calibration intervals as specified by the manufacturer are normally followed until the user can assign calibration intervals based on the history of previous calibration results. In addition, calibration is often required with a new instrument, or when an instrument may have been subjected to an unexpected shock or vibration that may have put it out of its specified limits.

    Different types of pressure measurement exist. These include gauge pressure, vacuum, absolute, barometric, and differential pressure. Gauges are available for each of the above types of pressures, as well as for compound pressure which indicates pressure or vacuum on the same dial.

    For the calibration information below, we will use gauge pressure, the most common type. There are many factors influencing calibration. Pressure gauges are manufactured in many different accuracy classes: The class indicates the allowable percentage error of the full-scale value of the gauge.

    Error values should always be rounded up, never round down. When calibrating, all values reported should be within the class of the gauge. If the class is unknown, the manufacturer should be contacted. For process applications, the following accuracies normally apply: Remember that these values are the percentage value of the full scale, not the percentage value of readings taken anywhere else on the dial. Lower pressure gauges are normally calibrated with air and higher pressure gauges are calibrated with liquid.

    For pressures below 40 kPa, gas such as nitrogen or alternatively regular air are the preferred media. Gas is also practical for use for pressures up to kPa as long as the Adiabatic cooling effect is eliminated. The Adiabatic cooling effect occurs when gas is rapidly pressurised in a closed system. The gas heats up and expands in volume, resulting in a higher pressure reading than after it has been allowed to cool down and stabilise.

    Pressure Gauge Calibration / Pressure Calibrator



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