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UMSITRPDS3-1 Post-Installation Test

November 2010

5-9

Transmitter above the active pressure taps (normal

arrangement)

Transmitter below the active pressure taps

(exception)

Transmitter

Compensation valve

Active pressure valves

Active pressure lines

Shutoff valves

Blowout valve

Condensation vessels (optional)

Active pressure taps

FIGURE 5-4 Measuring Gases

5.5.2.2 Measuring Liquids

Operate the shutoff valves in the following order. Refer to Figure 5-5 to identify the valves used in the

procedure.

1. Close all valves.

2. Open both shutoff valves (5) at the pressure taps.

3. Perform one of the following depending upon transmitter location:

• “Transmitter below the active pressure tap” - Open both blowout valves (7) one after the other.

• “Transmitter above the active pressure tap” - Open both vent valves (8) slightly until air-free

liquid emerges.

4. Close both blowout valves (7) or vent valves (8).

5. Open the active pressure valve (3A) and the vent valve at the high-pressure chamber of the

transmitter (1) slightly until air-free liquid emerges.

6. Close the vent valve.

7. Open the vent valve at the low-pressure chamber of the transmitter (1) slightly until air-free liquid

emerges.

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Siemens SITRANS P Manual do Utilizador Página 95