WIKA CPH7600 - Handbuch (Seite 37)

37 WIKA operating instructions, model CPH7600
14051628.01 11/2012 GB/D
GB
6. Commissioning, operation
Figure 6: CPH7600 with a pressure transmitter with %-Error function
6.11.4 %-Error function
The calibrator features a special function which can calculate the error in the pressure
value from the mA value as a percentage of the 4 ... 20 mA span. The %-Error mode
uses all three screens and has a special menu structure. It displays pressure, mA and
%-Error simultaneously.
Example:
Suppose a pressure transmitter under test has a full scale range (measuring range) of
20 bar and gives a corresponding 4 ... 20 mA output signal. The user can programme in
a 0 ... 20 bar pressure span into the calibrator and the calibrator will then calculate and
display the deviation or %-Error value from the 4 ... 20 mA output. This then eliminates
manual calculations of the test item deviation.
Use small-volume hose lines, as for as
possible