4. Design and function
16
WIKA Operating Instructions High Pressure Controller, Model CPC8000-H
GB
1
4
2
3
5
9
9
3
.0
0
/0
6
/2
0
1
7
/GB
The barometric reference sensor has six significant digits.
Specifications
Optional barometric reference
Range
552 ... 1170 mbar abs.
8
… 17 psi abs
Accuracy
0,01 % of reading
Resolution
6 Digits
Pressure Mode
The Pressure [Mode] key is shown on the main menu screen below the current pressure value and
displays the most recently chosen pressure units and the mode (absolute or gauge). If the optional
barometric reference is installed a [Mode] key replaces the mode indication to the right of the units
key. This [Mode] key indicates absolute or gauge mode. When the key is pressed it will switch
between the "native mode" of the internal sensor to the emulation mode. The "native mode" is the
mode of the sensor that is installed and is either absolute or gauge. Emulation mode uses the value of
the barometric reference to emulate the mode that is alternate to the native mode. The CPC8000-H
can emulate gauge from a native absolute sensor or absolute from a native gauge sensor. The [Mode]
key indicates the native mode with a blue key background and emulation mode with a light blue key
background. The units and mode chosen remain the same when the CPC8000-H is turned off and
then back on.
Native sensor is gauge, no barometric
reference installed.
Native
sensor
is
gauge,
barometric
reference installed.
Native
sensor
is
gauge,
barometric
reference installed and absolute emulation
active.
4.4.5.2.1 Gauge emulation mode
In the gauge emulation mode the atmospheric pressure reading from the barometric reference
transducer is subtracted from the absolute pressure reading of the active channel to emulate a gauge
pressure. Emulation mode uncertainty is the combined uncertainty of the barometric reference
transducer and the active transducer.
4.4.5.2.2 Absolute emulation mode
In absolute emulation mode the atmospheric pressure reading from the barometric reference
transducer is added to the gauge pressure reading of the active channel to emulate absolute pressure.
Emulation mode uncertainty is the combined uncertainty of the barometric reference transducer and
the active transducer.
