WIKA CPH6000 - Handbuch (Seite 31)

31 WIKA operating instructions ProcessCalibrator, model CPH6000
11069023.04 11/2012 GB/D
GB
6.5 Zero point and/or offset correction
Zero adjustment for overpressure instruments
If the measured value shown on the CPH6000, with a positive/relative pressure sensor
connected and the test assembly vented to atmosphere, is not equal to zero, then by
pressing the CLEAR key twice (within five seconds), the zero point can be corrected
(maximum allowable correction value is twice the magnitude of the accuracy class).
Offset correction for absolute pressure sensors
For absolute pressure sensors, an offset correction can be made via the menu (see
chapter 7.4.3 "SETUP additional menu items: ReferenceSensor")
7. Commissioning, operation
Instrument features
The instrument features 3 operating modes: MEASURING / CALIBRATION / SWITCH-
TEST, which each offer the user the maximum possible convenience in relation to the
application. To power the test items and to read their measurement signals, there are
various electrical inputs and outputs, which, as an option, can be shielded from harsh
field conditions by captive protective covers.
In the MEASURING (with test specimen) and CALIBRATION operating modes, the
measured values of both the reference pressure sensor and the test item, as well as
their deviation, are displayed in both current pressure units and in %.
In this way the operator is immediately informed whether the test item meets the
accuracy-class or not. The difference between these two modes is that the calibration
data in CALIBRATION mode are stored internally and can later be transferred onto
printable certificates through software (PrintCal or EasyCal).
For the transfer of data to a PC, the CPH6000 ProcessCalibrator has both an RS-232
and a USB connection, selectable via menu.
SETUP menu
Using the SETUP key, one can access the SETUP menu, where the required operating
mode (MEASURING / CALIBRATION / SWITCH-TEST) can be selected and
configured, a stored function can be recalled or a general instrument setting (such as
the menu language) can be changed.
6. Installation and mounting / 7. Commissioning, operation