Wika DPGT40 Bedienungsanleitung PDF herunterladen (Seite 17)

WIKA operating instructions dierential pressure transmitter, model DPGT40 17

14093267.01 03/2014 GB/D/F/E

6. Commissioning, operation / 7. Options and accessories

6.3 Setting up a voltage supply

The voltage supply is made via a power supply unit or a control unit which

provides the energy limitation.

The power supply for the pressure transmitter must be made via an energy-

limited electrical circuit in accordance with section 9.3 of UL/EN/IEC 61010-1, or

an LPS to UL/EN/IEC 60950-1, or class 2 in accordance with UL1310/UL1585

(NEC or CEC). The power supply must be suitable for operation above 2,000 m

should the pressure transmitter be used at this altitude.

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

avoiding 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

compensating valve

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

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