7. Operation
WIKA Operating Instruction High Pressure Controller, Model CPC8000-H
45
GB
1
42
3
59
9
3
.0
0/
0
6/2
0
17
/GB
Units
In the Setup [
] /[Sensor] tab there is a button labeled [Units]. When selected, the side bar will
display a set of 6 selectable units and an Up [
] and a Down [
] arrow used to scroll through a
set of 38 different units and 2 user defined units. Selecting any of these units will change the unit of
measure for the pressure sensed by all of the internal pressure transducers and will also apply these
units to reading taken remotely. This same selection of units can be accessed directly from the Main
screen by pressing the button displaying the current units.
Figure 7-32 Units
Rate Units
In the Setup [
] /[Sensor] tab there is a button labeled [Rate Units]. When selected, the side bar
will show a choice of time denominator units: Seconds [Sec] and Minutes [Min]. The currently selected
time denominator unit (Sec or Min) will have a blue background. Selecting minute [Min] or second
[Sec] will apply this time denominator to all rate functions in the instrument including [Rate Setpoint],
and [Vent Rate]. When this unit is change, all rate setpoints are adjusted so they are mathematically
equivalent to their current setting. For example, If the [Rate Setpoint] is set at 60 psi/min, then
changing the rate denominator unit to Seconds would convert the [Rate Setpoint] to 1 psi/sec.
Figure 7-33 Rate Units
User Units
In the Setup [
] / [Sensor] tab there are several buttons with prefixes “User Units”. These are used
to setup the “base unit” and multiplier used to define [User Unit 1] and [User Unit 2]. For [User Unit 1]
and [User Unit 2] the process is the same. Selecting the first [User Unit #] will display a choice of [psi],
[bar] or [pascal] in the sidebar. Choosing one of these “base units” will form the basis of the equation
that defines the [User Unit #] chosen. Immediately below the first [User Unit #] button is the [User Unit
#] Multiplier button that indicates the current multiplier and when pressed will display a keypad in the
side bar where a new multiplier can be entered. These two choices are used to calculate the value of
the [User Unit #] by the following equation: User Unit = 1 Base Unit X Multiplier. For example if a unit
is needed, that is not currently available from the 40 choices, for instance tons per square meter (tsm),
then the psi conversion factor for this can be found and is: 1 psi = 0.703069 tsm. In this instance psi
would be entered as the base unit and 0.703069 as the multiplier. The new user unit associated with
this base unit and multiplier would now be displayed when that User Unit is chosen in the main menu
or on the Setup [
] / [Sensor] / [Units] screen