Electrical Connection - WIKA Cryo Gauge 712.15.100 Mode D'emploi

4. Commissioning, operation
5. The plus side can now be pressurised
After completed adjustment:
- Close test connection screw again
EN
- Remove pressure standard and pressure generator again and seal connection
- Slowly open first ⊕ shut-off valve, then ⊖ shut-off valve
M20 x 1.5 test connection for checking the measuring instrument for the working pressure.
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The pressure compensating valve allows a zero point check during operation (with the
valve open).
1. Close shut-off valves for ⊕ and ⊖ side
2. Then open the pressure compensating valve
The medium will flow from the higher pressure side to the opposite side, the differential
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pressure on the instrument falling to zero (differential pressure display must be at zero, i.e.
within the zero tolerance range, which shows that the instrument is working correctly).
In case of deviation, the zero point can be set via the adjustable
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pointer installed as standard (prior to that, loosen bayonet ring
and remove window and sealing). The zero point setting is achie-
ved by turning the slotted screw on the adjustable pointer. After
completed zero point setting, re-fit bayonet ring plus window and
sealing and close pressure compensating valve.
For versions with integrated transmitter electronics, the electrical
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zero point must be set.
3. Close pressure compensating valve again.
4. Slowly open first ⊕ shut-off valve, then ⊖ shut-off valve.
Adapter for process connection (option)
The adapters can be flange mounted either directly to the differential pressure gauge or to the
valve manifold.
4 different process connections are available:
2 x G ½, female, centre distance 31 mm or 54 mm
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2 x ¼ NPT, female, centre distance 31 mm or 54 mm
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With a single order, all parts necessary for the fitting to the differential pressure gauge or to
the valve manifold are included in the delivery:
2 x hexagon screws M8 x 16
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2 x hexagon screws M8 x 28
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2 x nut M8
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2 x O-ring sealing
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4.4 Electrical connection

The electrical connection must only be made by qualified skilled personnel. The instrument
must be connected to the equipotential bonding of the plant.
Differential pressure gauge models 712.15.100, 732.15.100, optional for hazardous areas
16
Slotted
screw