A pressure calibrator performs calibrations on instruments and devices that measure pressure. Calibration is the process that adjusts these tools to make ensure they match precise measurement standards, thus maintaining their accuracy.
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Calibrating instruments are connected to the same pressure source as the gauges, transducers, pressure recorders, monitors, pressure controllers and deadweight testers that are to be calibrated. The testing instruments measure the output of the device and compare it to the accepted standards. If there is a discrepancy, the non-calibrating instrument or device is adjusted until the margin of error is zero and both values are identical. Pressure calibration is necessary for the proper functioning of instruments and devices that require accurate and precise measurements for quality control and safety reasons. A pressure gauge that is not calibrated may display an incorrect reading which can be very dangerous if the actual pressure is higher than the reading or lower. Pressure instruments are generally part of larger systems; decisions are made based on the reading provided by these instruments which is why they must be checked and calibrated. Calibration is used not only to adjust gauges and transducers but is also performed on a wide range of equipment and machines as well as devices that measure speed, temperature and torque.
Pressure calibrators may be necessary for a variety of reasons. A linear increase in pressure does not necessarily lead to a linear degree of deformation and so calibration must be performed to determine the true pressure. New instruments and devices are often calibrated before installed in a system. Other pressure instruments are calibrated after a certain period of time or usage has elapsed. Any shocks, vibrations or questionable results also warrant calibration. To measure pressure, these instruments generally have an internal strain gauge that is deformed to a degree in accordance with the force of pressure which is displayed on an analog gauge or digital screen. Calibrating devices are attached to the pressurized line, tank or system and take their own reading. The two measurements are compared and the pressure gauge or transducer is adjusted. These are inbuilt in the vast majority of systems. A trained technician performs the calibration by attaching a device that is able to produce a correct reading to contrast the measurement of the machine. The technician who performs the calibration usually completes a summary report and certificate to show that the machine has been calibrated to industrial and national standards.
