9. Calibration
WIKA Operating Instruction High Pressure Controller, Model CPC8000-H
75
GB
1
42
3
59
9
3
.0
0/
0
6/2
0
17
/GB
Figure 9-3 1 point calibration
A certificate number can be entered by pressing the [certificate] button. The date can be entered by
pressing the [Date] button. The calibration interval can be viewed and changed by pressing the
[Interval] button.
9.5.2 2-Point Calibration
A 2 Point Calibration adjusts both the “zero” (low point) and the “span” (high point) of the active
transducer.
Figure 9-4 2 point calibration
Follow the steps below for a complete 2 Point Calibration:
1. Select a Transducer to calibrate by pressing one of the available transducer tabs at the bottom
of the screen, in this case [Primary] [Secondary], [Tertiary], or [Barometer].
2. Insure that the head correction is adjusted properly (see Section 7.3.5.2).
3. The 2 point calibration screen is accessed through the password protected portion of the
Setup [ ]/ [Applications] area. See Section 7.5.1 for the default password.
4.
To calibrate the “low Point”:
a. The Measure /Control port of the instrument sh
ould be supplied with a suitable, “low
point”
pressure (see 4.5 Rear Panel, for the port location).
b. For a gauge transducer, this low point pressure can be achieved by Pressing the
[Vent] button on the 2 Point calibration screen and wait for the reading to stabilize at,
or close to, zero.
c. The pressure should be measured at a stable value that is within 20% of the minimum
range of the selected internal transducer.
d.
When the pressure is stable the [Reading] button, under the “Actual” label and on the
row labeled “Low Point”, should be pressed. This action accepts the value and it will
appear with a green background where the [Reading] button was.
e. Press the [
New Value] button and, via the numeric key pad, enter the “true pressure”
obtained from the calibration standard. After the value has been accepted by pressing
the [check] mark on the numeric key pad the value will appear with a green
