9. Calibration
WIKA Operating Instruction High Pressure Controller, Model CPC8000-H
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9. Calibration
9.1 Calibration Environment
For maximum accuracy, allow the CPC8000-H to warm up for a minimum of 25 minutes in an ambient
temperature within the compensated range prior to commencing a calibration. In addition the
instrument should be at rest on a stable platform that is free of excessive vibration and shock.
9.2 Calibration Pressure Standards
Mensor recommends the use of appropriately accurate pressure standards when calibrating this
instrument. Such standards should be sufficient so that when the techniques of the ISO Guide to the
Expression of Uncertainty in Measurement (GUM) are applied, the instrument meets its accuracy
statements as required by ISO/IEC 17025:2005, or other applicable standards.
9.3 Calibration Media
For calibration of the hydraulic reference pressure sensor of the CPC8000-HM the fluid used in the
controller is recommended is required.
For calibration of the internal pneumatic control sensor of the CPC8000-HC and the barometric
reference gas media are required. The recommended medium is dry nitrogen or clean, dry, instrument
air.
9.4 Calibration Setup
Refer to the calibration setup illustration on the following page (see Figure 9-1 Absolute pressure
calibration). The illustration shows a typical calibration setup for absolute and gauge pressure
instruments. The ‘Pressure Standard’ is normally a deadweight tester, a precision piston balance or a
precision manometer. The ‘Volume Controller’ refers to a hand operat
ed variable-volume pressure
vernier device.
Figure 9-1 Absolute pressure calibration
