Pressure Gauge With Working Pressure Indication (Option) - WIKA Cryo Gauge 712.15.100 Betriebsanleitung

4. Commissioning, operation

4.3 Pressure gauge with working pressure indication (option)

Expansion with a compact valve manifold with pressure gauge connectable via a flange
allows, in addition to the level detection, the measurement of the working pressure at a central
measuring point.
Test connection M20
x 1.5
⊖ shut-off valve
Pressure gauge for working pressure indication (option)
Non-Ex version: Model 212.20.100
Ex version: Models 232.50.63, 232.50.100, 232.30.100
Functions of valve manifold
Shut-off of the process line without interrupting operations:
■
- For instrument mounting and testing
- For protecting the instrument from impermissible overpressure load of n-times rated
pressure of the plant
Protection of the instrument against pressure surges and shocks and thus against unspeci-
■
fied operating conditions
Instrument shutdown, for example, if measurements are only sporadically required over
■
prolonged operating periods (to increase the service life of the instrument at high pressure
change frequency)
Recalibration of the differential pressure gauge (level indication)
■
1. Close shut-off valves for ⊕ and ⊖ side
2. Then open pressure compensating valve, wait for a short period and close the pressure
compensating valve again
3. The pressure standard and pressure generator are connected in the plus chamber of
the measuring system via an additional G ¼ female thread.
4. In the valve manifold, remove the test connection screw on the ⊖ side
Differential pressure gauge models 712.15.100, 732.15.100, optional for hazardous areas
Working pressure indica-
tion with pressure gauge
Pressure compensating
valve
⊕ shut-off valve
EN
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