The Difference Between Automatic and Manual Calibration
It’s important to keep in mind that calibration methods for modern devices (as opposed to more ancient devices) can be both manual and automatic depending on what kind of device is being calibrated.
For instance, in this first photo of a US servicemen calibrating a temperature gauge this photo, he’s performing a manual calibration. The procedure is quite complex but overall it involves the following steps:
- Depressurising the system and turning the screw to ensure that the needle reads 0.
- Fully pressurising the system and insuring that the needle reads maximum with an acceptable tolerances.
- Replacing the gauge if the error in the calibration process is beyond tolerance as this may indicate signs of failure.
In the second photo we see the use of a 3666c automatic pressure calibrator. This is an example of automatic calibration. This device consists of a control unit housing the electronics that drive the system, a pressure intensifier used to compress gas such as nitrogen, a pressure transducer used to detect target levels in a hydraulic accumulator, and also accessories such as liquid traps and gauge fittings.
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