Pressure calibrators come in a wide variety. A pressure calibrator is simply a pressure measuring device capable of verifying (or calibrating) the pressure reading of another pressure measuring device. These devices might also be called pressure standards. The pressure calibrator must be more accurate than the device being calibrated. Traditionally, the calibration ration is 4:1. This means that the pressure calibrator is 4 times more accurate than the device it is calibrating. A pressure calibrator can also have secondary features that facilitate the calibration. For example, a pressure calibrator may have the capability to measure the output from the device under test (DUT). It might also have an internal pump capable of generating pressures used in the calibration, or it could have a precision regulator that can control a supply pressure and maintain a precise pressure output. Pressure Calibrator is a widely used term that can mean a lot of different things to a lot of different people.
Pressure calibrators can come in different configurations to fit specific requirements. For field pressure calibration, where there is a requirement for portability and functions that may include voltage, amperage or digital signal monitoring/recording from the device being calibrated, handheld multi function calibrators are the tool of choice. In a laboratory environment where a higher accuracy may be required and precise control of pressure is needed, a pressure calibrator / controller would be a better choice. Deadweight testers come in a wide range of accuracies and pressure ranges and have been utilized for years in the field and in laboratories. Deadweight testers generate pressure using the definition of pressure ( Pressure = Force / Area). The uncertainty or accuracy associated with deadweight testers is given as a percent of the reading as apposed to a percent of full scale and they require no power to operate. For these reasons and others they are sometimes seen as a superior choice, but they are also bulky and require a skilled operator. High end deadweight testers are still considered the gold standard for pressure calibration at its highest level in laboratories around the world, but more and more handheld and pressure controllers are replacing deadweight testers in the field and in process applications.
WIKA pressure calibrators, in general may be described as portable process calibrators, or multi function pressure calibrators because they have additional features beyond just pressure calibration. Examples of these are the CPH7000 Portable Pressure Calibrator, the Pascal 100 and Pascal ET Hand-Held Multifunction Calibrators.
DH-Budenberg has a variety of deadweight testers that can be used as pressure calibrators.
Mensor pressure calibrators are available as transducers, indicators and controllers. Each of these could be used as a pressure standard, or pressure calibrator. A Mensor transducer will requires a regulated pressure source and a way to read the output from the transducer. An indicator will require a regulated pressure source. A Mensor controlling pressure calibrator can control pressure to a precise setpoint and measure the pressure with high accuracy internal transducers. Mensor controlling pressure calibrators can have multiple channels and multiple transducers to expand their range and accuracy.
With these pressure calibrators, pressure calibration is possible in ranges from -15 … +70,000 psi