PGC 302 only:
Purging the electronics area
The electronics area must be purged for corrosion pro-
tection or explosion protection in division 2 or 1 areas.
Close the electronics door!
PGC 302
in division 2 area
Adjust a suitable flow for the protective gas on the
needle valve/rotameter, max. 20 l/min
Purge the chromatograph with at least 1400 l
Reduce the flow to 10 to 20 l/min, the pressure
switch must still be activated reliably
NOTE:
The needle valve with rotameter is not part of the chromato-
graph. It must be mounted externally.
The pressure switch is installed in the chromatograph. Regis-
ter 3:
Connection of status messages to control room
describes
how it is connected. If your control unit is permanently con-
nected to the chromatograph, you can observe the status of the
purging pressure on the former.
If the control unit is not permanently connected to the chroma-
tograph, it is possible e.g. to connect a lamp to the digital
output
Maintenance request
. The status of the purging press-
ure must be assigned to
Maintenance request
. This is de-
scribed in Register 5:
Status
.
PGC 302
in division 1 area
Open external purging gas valve
Switch on chromatograph using external master
switch
Press the switch ON on the control panel of the
purging time controller (key switch not to Bypass).
You can find more details in the register Informa-
tion for the user: Explosion protection. The control-
ler switches the chromatograph on after 12.5
minutes. If it does not, check the purging gas press-
ure and also for leaks. The purging gas pressure
must be 4 to 6 bar.
ADDITIONAL FOR SERVICE
AND INITIAL COMMISSIONING
Only for classified
PGC 302
in division 1 area:
position the key switch of the purging time control-
ler to Bypass. The door to the electronics area can
now be opened without the chromatograph being
switched off by the controller.
WARNING
You require a permit if you wish to operate
the chromatograph with the electronics door
open. Always refer to the information in the
register
Information for the user: Explosion
protection
.
Connect the local control unit to the chromatograph
as described in the register Installation: Connection
of control unit, and start the operating software as
described in the register Software and networking:
Starting the software.
NOTE:
If you use your own applications, or if the PCPU-2 of the
chromatograph has been replaced, you must first program
the control software in the chromatographs and also con-
figure the units if necessary. This is described in the regis-
ter
Software and networking
.
Now adjust the detectors as described on the next
two pages. Then return to here!
Connection of exhaust gas lines
Connect the exhaust gas lines to the gas outlets of the
chromatograph according to the piping diagram.
Starting process operation
If the application is correct, switch the mode Pro-
cess operation on. Process operation starts automat-
ically as soon as the chromatograph signals that it is
ready.
Disconnect the cable of the local control unit from
the chromatograph, and close the door to the elec-
tronics area.
Activation of explosion protection
Only with classified
PGC 302
in division 1 area: switch
over the key switch on the purging time controller after
approx. 10 seconds. The safety monitoring function is
now active again.
Commissioning and shutting down
4INBETR.CHP, Stand Dezember 22, 1999
3
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