Valve Manifold With Working Pressure Gauge (Optional) - WIKA Cryo Gauge 712.15.100 Betriebsanleitung

4. Valve manifold with working pressure gauge (optional)

5. Valve manifold with working pressure gauge (optional)
4. Valve manifold with working pressure gauge (optional)
The compact optional flanged valve manifold for an NG 63 working pressure gauge allows the
central measurement of level and working pressure in a single device.
Test connection
M20 x 1.5
Isolating valve
i
c) Connect the pressure standard and test pump using the additional G ¼ female port in
the plus chamber of the measuring system
d) Remove the test connection screw from the minus side valve manifold
e) The plus side can then be pressurised
f) After adjustment:
- Close the air bleed screw
- Disconnect the pressure standard and test pump and close the connection
- Open the integrated pressure equalising valve
- Slowly open first the plus and then the minus shut-off valve
- Close the pressure equalising valve
Test connection M20 x 1.5 for checking the working pressure gauge
„
The pressure equalising valve allows a zero point control during operation (with open valve).
While the media is flowing from the higher pressure side to the other side, the differential
„
pressure at the pressure gauge drops to zero (the differential pressure display must be at
zero, i.e. within the zero tolerance range which shows that the gauge is working correctly).
A zero adjustment can be made using the standard integra-
„
ted, adjustable pointer (remove snap fit bezel incl. window and
sealing ring beforehand). Twisting the slotted screw on the
adjustable pointer you can adjust the zero point.
After completing the zero adjustment, the snap fit bezel,
incl. window and ‚o'-ring seal, must be correctly re-fitted
and the pressure equalising valve must then be closed again.
Subsequently the zero point of versions with integrated
„
transmitter (see page 8) should be checked.
WIKA operating instructions differential pressure gauge models 712.15.100, 732.15.100
To isolate line pressures without inter-
„
rupting the process, enabling gauge
removal/examination and protecting the
gauge against overpressure of n-times
rated pressure which may occur during
plant pressure testing.
To protect the gauge against pressure
„
surges/pressure spikes, and thus against
unspecified operating conditions
Working
For gauge shut-downs, if no measure-
pressure gauge
„
NS 63
ments are required for long operating
periods, i.e. if only occasional measure-
ments are necessary (to increase service
life of those differential and working pressu-
Pressure
equalising
re gauges with a high frequency of pressure
valve
fluctuations).
Recalibration of differential pressure
„
Isolating valve
gauges (tank volume display)
j
a) Open pressure equalising valve
b) Close the plus and minus shut-off valves,
and then close the pressure equalising
valve again
GB
Slotted
screw
7