22
WIKA operating instruction, model CPP120-X
EN
08/2020 EN/DE
6. Commissioning, operation
For tapered threaded connection PTFE tape should be used for producing an
effective seal.
It is not recommended that liquid sealants are used as they may contaminate
the comparison test pump.
Before using the CPP120-X pneumatic comparison test pump check:
■
All pressure connections are correctly fitted and tightened.
■
The volume adjuster
5
is approximately at its mid-position.
⇒
Adjust the volume adjuster
5
by turning clockwise or anti-clockwise.
■
Ensuring the external pressure or vacuum supply is correctly connected and regulated
(see chapter 6.4.2 "Connection of external pressure/vacuum supply").
6.5.1 Increasing pressure
CAUTION!
Damage of the vent and inlet valve caused by overtightening
Overtightening of the valves will result a shorter working life and thus involve
maintenance.
▶
The inlet valve and outlet valve are of a ‘soft seat’ design and should only
require to be finger-tight to achieve an effective seal.
CAUTION!
Damage of the test item or reference pressure measuring instrument
caused by too high pressure
The test item and reference pressure measuring instrument with pressure
ranges < 120 bar [< 1,740.5 psi] can be damaged through the pressure
generation.
▶
Do not exceed the maximum pressure limit of the test item or reference
pressure measuring instrument.
▶
Only generate a pre-pressure that is less than the required pressure.
▶
Use the fine volume adjuster to reach the exact required pressure.
1. Close the outlet valve
4
by turning clockwise.
2. Open the inlet valve
3
carefully by turning anti-clockwise.
3. As you slowly reach the desired calibration pressure begin to close the inlet valve
3
by turning clockwise.
⇒
Close inlet valve
3
and use the volume adjuster
5
to obtain desired pressure
point required.