Handling Instructions - WIKA 702.02.100 Mode D'emploi

8. Optional extras / accessories
8.2 Four-way valve manifold
T Shut off j - and i process line for disassembling and testing of
GB
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).
Process line air bleeding for liquid measuring
T
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
Operating sequence for air bleeding/purging of piping
T
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
Task list for removing the transmitter during normal operation
T
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
10
WIKA Operating instructions DELTA-plus, DELTA-comb and DELTA-switch per ATEX
Pressure
equalising valve
Gauge valve,
high pressure
j
side
Gauge valve, Valve for
low pressure purging or
i
side air bleeding