Options And Accessories; Four-Way Valve Manifold - WIKA DELTA-plus DPG40 Betriebsanleitung

6. Commissioning, operation / 7. Options and accessories
Switch point and zero point setting
The switch point and zero point setting is made by adjustment screws in the front,
which, depending on the instrument model, are accessible by loosening the
window or the plug screws.
By turning the adjustment screw using a screwdriver the desired zero point is set.
The switch points are set at the factory when the set points are given.
An auxiliary scale makes setting the switch point easier.
If an accurate switch point setting is required, a reference standard should be
used for the adjustment.
Commissioning
During the commissioning process pressure surges must be avoided at all costs.
Open the shut-off valves slowly.

7. Options and accessories

7.1 Four-way valve manifold

Isolation of the ⊕ and ⊖ process lines for dismounting or testing the measu-
■
ring instrument without interrupting the running process operation.
Protection of the instrument against
excessive overpressure loading, such as
in pressure tests and undefined operating
conditions (including intermittent shutdown).
Pressure compensation for zero point
■
checking while process is running as well
as avoidance of one-sided overpressure loa-
ding during the start-up or operating phase
(with open pressure compensating valve).
Venting the measuring lines with liquid
■
media and flushing of the measuring lines,
in order to remove contamination.
WIKA operating instructions DELTA-plus, DELTA-comb and DELTA-switch
Pressure
compensating valve
Shut-off valve
⊕
side
Shut-off valve
⊖
side
EN
Vent valve
25