Wika 702.03.100 Manual de usuario descargar pdf (Pagina 15)

WIKA operating instructions dierential pressure gauge, model 702.03.100 15

2367781.03 06/2013 GB/D/F/E

Commissioning

During the commissioning process pressure surges must be avoided at all costs.

Open the shut-o valves slowly.

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 unit 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 me-

dia and ushing of the measuring lines, in

order to remove contamination.

Specications for handling

■

Sequence of operations to start measurement

1. Open the pressure compensating valve (middle valve spindle)

2. Open the shut-o valve for the negative media chamber (⊖, right-hand valve)

and the positive media chamber (⊕, left-hand valve)

3. Close the pressure compensating valve

■

Sequence of operations to ush/vent the measuring lines

1. Start: Open the shut-o valve for the ⊕ and ⊖ media chamber, open the

pressure compensating valve and vent valve

2. Finish: Close the pressure compensating valve and vent valve

■

Sequence of operations to nish measurement (also temporary shutdown)

1. Open the pressure compensating valve

2. Close the shut-o valve for the ⊕ and ⊖ media chamber

Vent valve

Shut-o valve

⊖ side

Shut-o valve

⊕ side

Pressure com-

pensating valve

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 71 72

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Wika 702.03.100 Manual de usuario Pagina 15

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