The comparative measurement can be based on two different methods - using a pressure reference device or using high-precision pressure compensators with known mass pieces.
Pressure controllers are precision pressure regulators with a built-in electrical pressure generator. They are usually equipped with a touchscreen and thus enable intuitive operation. By setting a specific target value or by choosing preprogrammed steps, the control process is started. The value from the device under test can then be compared to the reference target value and be documented. Pressure controllers thus allow the desired pressure measurement result to be approached in an exact and automated manner.
By contrast, deadweight testers can be used to implement specific pressures by applying a defined force to a piston cylinder of known diameter. In practice, known mass pieces are placed on the piston to do so. The result is a reference pressure that can be picked off directly at the point of measurement.
Calibration is performed on the basis of 6 measurement points in steps of 20% of the measuring range end value, in measuring ranges of -1...1bar, -1…10bar and 0...700bar.By default, the calibration is performed with factory settings using the analogue output (current) or, alternatively, visually using the display of the device or the analogue output (voltage).
The comparative measurement for pressure sensors is performed with high-precision deadweight testers by using known mass pieces. These are placed on a piston cylinder of known diameter, applying a defined force. The result is a reference pressure that can be picked off directly at the point of measurement.
Acc. to sequence B of the calibration procedure, after the necessary preloading, 11 measurement points are approached in an up cycle, then a down cycle, then again in an up cycle. By default, the calibration is performed with factory settings using the analogue output (current) or, alternatively, visually using the display of the device or the analogue output (voltage).