Last Updated on December 30, 2022 by Hammad Hassan
Pressure calibration is the comparison of readings taken from a pressure measuring instrument to a known standard. The set standard can be both static as well as dynamic, the former being like atmospheric pressure and the latter similar to the pressure felt in a water pipe.
Pressure readings are done best by using Pressure Gauge Calibration Equipment because of its accuracy. Given below is an overview of the instruments used in pressure calibration. Also, the importance of pressure calibration and it use in ensuring the accuracy of pressure readings has been written about below.
The instruments used in pressure calibration
There are several instruments used in pressure calibration. Each device is used for a different type of pressure standard, as every kind of pressure standard requires a different type of instrument. The apparatus used for pressure testing and calibration services include:
a. Pressure Gauge
Pressure gauging is done through multiple tools, such as a deadweight tester, a typical pneumatic calibrator, or another calibrator that can take an accurate reading.
b. Pressure Switches
Pressure switches can be used for both static and dynamic pressures. These switches help control the activation of pumps in the fluid system when you reach the preferred pressure.
c. Pressure Transmitters
Pressure transmitters are of multiple type, which include the gauge pressure transmitter, absolute transmitter, and the differential-pressure transmitter. All of these help measure the expansive force of a gas or a liquid when under pressure.
Manual Pressure Calibration
Static Pressure Standards
Static pressure standards use an instrument to measure the atmospheric pressure at the location of the calibration. To determine a correction factor, you need to compare this pressure to the pressure reading on the instrument being calibrated.
Dynamic Pressure Standards
A water or an oil column is a column of water or oil used during dynamic pressure calibration. The calibration pressure measures the amount of water or oil needed to produce the same pressure as the dynamic pressure being measured . The amount of water or oil required to make the same pressure as the dynamic pressure you are measuring depends on the specific viscosity of the fluid you are using.
Pressure gauges can be used to measure both static and dynamic pressures. They are most often used to measure liquid pressures, like the pressure in a water pipe. The gauge you are calibrating is placed on the same scale as the indicator used to measure the static pressure.
The static pressure is then compared to the gauge reading. You can do this manually or automatically using a computer program.
Why is Pressure Calibration Necessary?
Pressure calibration is essential because it ensures the accuracy of the pressure readings. An inaccurate reading can lead to an unsafe situation. For example, if the reading of a pressure gauge on an engine is incorrect, it may be running at a pressure that is too low or too high, increasing the risk of engine failure.Pressure gauges and switches are used to measure a range of different types of pressure. This means that there is a more significant margin for error, emphasizing the importance of pressure gauge calibration equipment. Moreover, there are different levels of accuracy for pressure instruments. This means that there are different standards to adhere to, while calibrating an instrument.