WIKA CPH65I0 - Handbuch (Seite 35)

35 WIKA operating instructions, model CPH65I0
14061681.02 03/2013 GB/D
GB
6. Commissioning, operation
In order to protect the sensor from damage, the calibrator displays "OL"
[Overload] as soon as the applied pressure exceeds 120 % of the
complete measuring range.
In order to ensure the accuracy of the calibrator, it is necessary to reset
the calibrator to zero before a calibration.
6.7.1 Media compatibility
Most of the calibrator measuring ranges include a sensor that is isolated from the
medium in order to eliminate any contamination (observe chapter 3 "Specifications").
If possible, use clean dry air. As this is not always possible, it must be ensured that the
medium is compatible with nickel-plated brass and stainless steel.
6.8 Measuring current
WARNING!
Observe the connection parameters prior to making a connection to the
instrument.
To measure current, use the input terminals on the front of the calibrator. Select the
mA function on the lower display. Current is measured in mA and percentage of the
measuring range. The measuring range on the calibrator is set to 0 % at 4 mA and
100 % at 20 mA.
Example:
If the current measured is displayed as 75 %, then the value is 16 mA.
The display will indicate "OL" when the measured current exceeds the
nominal range of current measurement (24 mA).
Test item
4 ... 20 mA