Before getting into the intricacies of pressure gauge calibration it’s really important to know what calibration means. Do you know what calibration is? Well, calibration is a process of determining equipment’s measuring accuracy. The process involves obtaining a reading from the instrument and measuring its variation from the reading obtained from a standard instrument. Calibration of several instruments also deals with adjusting the precision and accuracy to make sure that the readings come in parity with the established standard. Similarly, pressure gauge calibration signifies a process to determine the measuring accuracy of a pressure gauge.
Pressure Gauge Calibration Procedure
It’s essential to have an understanding of the pressure gauge calibration procedure to get a proper idea about the pressure gauge calibrator. A typical pressure gauge measures the performance of the gauge at between 5 and 10 pressure points which is spread across equally on the scale for both rising and falling applied pressures. Usually, these pressures fall on the main scale markings for an analogue gauge or at a suitable interval for a digital gauge. The gauge should be taken around the pressure cycle from zero to full scale and back at least once before going ahead with the calibration measurement. This helps to find out whether the gauge has a major fault that would prevent calibration.
The gauge reading at each calibration point is calculated for both rising and falling pressure. Rising pressure means the lowest pressure point on the gauge which is increasing steadily until the calibration pressure point is reached. Falling pressure means starting at the maximum pressure point on the gauge and then gradually decreasing the pressure to the calibration pressure point. When the desired point is reached on the scale, the pressure is held steady and the gauge reading is considered. The operator mustn’t hurry and should wait until both the applied pressure and gauge reading have stabilised before recording a reading. This method is followed for all different types of gauge.
Pressure Gauge Calibration Equipment
There are more than one pressure gauge calibration equipment. To know more, keep reading below:
- Deadweight Testers- They offer the most accurate measurement of pressure. No other equipment can match the stability, continuity and accuracy of the deadweight tester. It is apt for calibrating pressure transducers, pressure gauges, recorders, and so on. It can be sub-divided into the following below-mentioned testers-
a) Oil operated deadweight testers
b) Gas driven oil lubricated deadweight testers
c) Differential gas driven oil lubricated deadweight testers
- Gas pressure Regulators- These are used to control and regulate the gas pressures. They play a major role in a combination with gas deadweight testers and also can be used for other calibration purposes.
- Comparison Test Pumps- These are portable and rugged pumps for checking pressure instruments against a master test gauge or transducers.
- Accessories- Like dirt/moisture trap, oxygen tester, instrument stand, adapters.
Pressure Gauge Calibration Frequency
The calibration frequency of the pressure gauge should be kept within shorter intervals to reduce the risk of wrong measurements. There are several factors that determine the frequency of calibration in measuring the accuracy and these are as follows-
- Usage of the pressure gauge
- The environmental conditions where the pressure gauges are stored and used.
Uncertainties in measurement.
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