7. Operation
46
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
Figure 7-34 User units and user units multiplier
7.3.3 Control Tab
The [Control] tab within the Setup [
] menu contains settings that limit or control display elements
associated with the pressure output from the instrument’s regulator. Control limits, stable window
configuration, and the rate setpoint can be found in this section.
Max and Minimum Limits
The [Maximum Limit] and [Minimum Limit] buttons under the Setup [
] / [Control] screen provide a
place to limit the setpoint that can be chosen in the main screen. These limits can only be set within
the range of the active sensor. When the CPC8000 is in Autorange the limits can only be set within the
range of the primary transducer which, by convention, will have the widest range. The minimum limit
must be lower than the maximum limit. The operator cannot enter setpoints and thereby not control to
pressures outside of these limits.
Figure 7-35 Maximum Limit and Minimum Limit Buttons
Stable Limits
Both the [Stable Limits] and the [Stable Delay] buttons can be found under the [Control] tab in the
Setup [
] menu. Both of these are used to define a stable condition for pressure control or
measurement (see Figure 7-36). When the controller enters a stable condition the font color for the
pressure indication will change from white to green. For example, an operator would like the
CPC8000-H to show a stable indication only after the pressure output has been at the setpoint
±0.003% FS for 2 seconds. In this case, the [Stable Limit] should be set at 0.002, and the [Stable
Delay] should be set at 2. The graphic in Figure 7-37 illustrates this.
