Wika DPS40 Manual de usuario descargar pdf (Pagina 20)

WIKA operating instructions DELTA-plus, DELTA-comb and DELTA-switch20

14093265.01 03/2014 GB/D/F/E

6. Commissioning, operation / 7. Options and accessories

7. Options and accessories

7.1 4-way valve manifold

■

Isolation of the ⊕ and ⊖ process lines for removing or testing the measuring

instrument without interrupting the running process operation.

Protection of the instrument against

excessive overpressure loading, such as

in pressure tests and undened operating

conditions (including intermittent shutdown).

■

Pressure compensation for zero point

checking with running processes, and avoid-

ing one-sided overpressure loading during

start-up and operation phases (with opened

pressure compensating valve).

■

Venting the measuring lines with liquid

media and ushing of the measuring lines,

in order to remove contamination.

Vent valve

Shut-o valve

⊖ side

Shut-o valve

⊕ side

Pressure compen-

sating valve

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 win-

dow or the locking 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 assistant scale enables an accurate setting of the switch point and indicates

the current set point.

If an even more 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-o valves slowly.

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Wika DPS40 Manual de usuario Pagina 20