WIKA CPH6400 - Handbuch (Seite 22)

22 WIKA operating instructions, model CPH6400
11313439.04 12/2012 GB/D
GB
6. Commissioning, operation
6. Commissioning, operation
6.1 Requirements for test assemblies with the CPH6400
Before starting any task, the device should be switched on briefly to
determine that there is sufficient charge in the battery (battery level in %).
The battery level is shown in the upper right of the screen in a device-
status message. 100 % battery charge will enable approximately 25
hours of instrument operation.
Initially the test assembly must be physically assembled and connected electrically (see
chapter "4.4.1 Connection of the model CPT6400 reference pressure sensor").
Before switching the CPH6400 on, ensure that the test assembly is not pressurised
(system is vented to atmosphere) and that the equipment is correctly assembled and in
the correct mounting position.
Only disconnect test and calibration installations once the system has
been depressurised!
Particularly small measuring ranges (e.g. < 1 bar) are orientation dependent (i.e. the
mounting position considerably influences the measurement signal). This can be
compensated, if necessary, using the TARE function (see chapter "6.5 TARE function").
Absolute-pressure measuring ranges < 1 bar absolute are, by definition, in an overload
condition at atmospheric pressure. Therefore the message "Sensor Overflow" appears in
the display, indicating a pressure outside of the measuring range of the attached sensor.
If the pressure is reduced, so that it falls within the permissible measuring range, then this
message disappears from the display.
6.2 Instrument features
The precision hand-held pressure indicator features 3 operating modes:
■ MEASURING MODE without additional function (standard measuring mode)
■ MEASURING MODE with MIN and MAX function
■ MEASURING MODE with display of the pressure rate (with 2-channel version with
additional display of temperature)