WIKA 851.02.100 - Manual (Page 10)

10 WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch per ATEX
11242370 06/2007 GB/D/F
GB
Gauge valve,
low pressure
side i
Pressure
equalising valve
Gauge valve,
high pressure
side j
Valve for
purging or
air bleeding
8. Optional extras / accessories
8.2 Four-way valve manifold
T Shut off j - and i process line for disassembling and testing of
measuring instrument without interrupting the process that is running.
Protect the instrument against inadmissible
overpressure loading, such as, for example,
in the case of pressure tests and undefined
operating conditions (also temporary shut
down).
T Pressure equalising for zero point check
during normal operation as well as equali-
sation of the pressures at high pressure and
low pressure side during start-up and operation
(with opened pressure equalising valve).
T Process line air bleeding for liquid measuring
media and purging the process line for
removing impurities.
8.2.1 Handling instructions
T Work sequence to start measuring
1. Open pressure equalising valve (middle valve)
2. Open shut-off valve of the negative-pressure media chamber (i right
valve) and the positive-pressure media chamber (j left valve)
3. Close pressure equalising valve
T Operating sequence for air bleeding/purging of piping
1. start: Open shut-off valve of the negative-pressure (i) and positive-
pressure (j) media chamber
Open pressure equalising valve and valve for purging or air bleeding
2. end: Close pressure equalising valve and valve for purging or air bleeding
T Procedure at the end of the measuring operation
(also for partial system shut-down)
1. Open pressure equalising valve
2. Close shut-off valve of the negative-pressure (i) and positive-pressure
(j) media chamber
T Task list for removing the transmitter during normal operation
1. Open pressure equalising valve
2. Close shut-off valve of the negative-pressure (i) and positive-pressure
(j) media chamber
3. Open valve for purging or air bleeding