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1 About this manual
Caution
If an automatic shut-off takes place, it must be taken into consideration that
air may have penetrated into the measuring element. In this case, the power
supply must be switched off prior to replacing the cylinder, because the
measuring element will switch itself on again if there is sufficient pressure.
20
The measuring element must be flushed for at least 15 minutes after cylin-
der replacement. If an alarm message is issued after recommissioning, a
service call by RMG is required.
Cylinder replacement should take place on notification of an empty cylinder from the
contact manometer.
Caution
The instructions at the cylinder frame must be observed for cylinder re-
placement.
Air must be prevented from entering the system during cylinder replace-
ment!
Switchover unit for uninterrupted operation
The switchover unit guarantees uninterrupted carrier gas supply when two filled
carrier gas cylinders are connected. A cylinder is selected for extraction during op-
eration. Once this cylinder undercuts the minimum cylinder pressure (switchover
pressure) setting, the unit automatically switches to the other (still full) cylinder so
that the empty cylinder can be replaced. The selector switch located in the middle
determines the cylinder from which gas is extracted (if neither of the two cylinders
is below the minimum pressure setting).
Cylinder replacement
Carry out the following steps in the specified sequence in order to replace a gas
cylinder. The same procedure must also be used for commissioning in order to
connect and flush two cylinders in succession. These instructions describe the
procedure for the exchange of the left cylinder identified with the letter A. To ex-
change the right cylinder B, replace A with B in the description.
1.
2.
3.
Manual PGC 9300 EN07 June, 18th 2018
Set the selector switch to cylinder B (arrow points to cylinder B) to re-
place cylinder A!
Close the cylinder valve of A and extraction valve 2A.
Open vent valve 1A and close it again after pressure equalization.
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