Siemens SITRANS P Uživatelský manuál stáhnout pdf (Strana 61)

UMSITRPDS3-1 Installation

November 2010

4-9

MG00348b

Closed Tank, Non-Condensing Atmosphere, Level Measurement

Blowdown

Valve

Non-Condensing

Atmosphere

Dry Line Leg

Open Tank, Level Measurement

Span

Low Pressure

Side Vented to

Atmosphere

Flange on High

Pressure Side

Closed Tank, Condensing Atmosphere, Level Measurement

Blowdown

Valve

Condensing

Atmosphere

Flange on High

Pressure Side

Low Pressure

Side

Plugged

Filling "T"

Filled

Reference

Line

Max. Level

Min. Level

Span

Max. Level

Min. Level

Span

Min. Level

Max. Level

Notes:

1. Transmitter may be mounted at or below the

minimum level to be measured.

2. Open or vented vessels require only a high pressure

(HP) connection.

3. High pressure line senses static pressure plus level.

Low pressure line senses pressure only. The two

pressures oppose each other, canceling the effect

of static pressure.

4. Distance "X" can be any distance since both high

and low pressure lines have equal and opposite

forces which cancel the forces created by this

distance.

5. Entire length of low pressure pipe is kept full of

condensate to act as a reference.

6. See Appendix C for information on calculating

suppressed and elevated zero ranges.

FIGURE 4-5 Open and Closed Tank Level Measurement, Flange Mounted Transmitters

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 221 222

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