WIKA CPH65I0 Betriebsanleitung Seite 24

6. Commissioning, operation
6.3.1 Internal relative pressure sensor
When a relative pressure sensor is selected in the {active display} and the ZERO key
is pressed, the calibrator subtracts the current displayed reading from the output value.
GB
The zero limits are within 5 % of the full scale range of the selected sensor. If the display
indicates "OL" the zero function will not operate.
6.3.2 Internal absolute pressure sensor
If an absolute pressure sensor is selected in the {active display} and the ZERO button
is pressed, the calibrator instructs the user to enter the reference pressure value with
"SET" or to reset with "DEFAULT". The reference instrument should be at least four
times as accurate as the absolute pressure sensor of the CPH65I0.
If "SET" is selected, the calibrator prompts the user to enter the barometric reference
pressure. The arrow keys, F2 and F3, can be used for this. The sensor connection
should be open (vented) to atmosphere while performing this procedure.
If, alternatively, "DEFAULT" is selected, the reversion to the factory setting must be
accepted with "CONFIRM" or the action aborted with "CANCEL".
24 WIKA operating instructions, model CPH65I0