Purge cycle

Pressing the "Out of service" status display for a valve will open a selection window.

Press the "Purge" button to switch the system over to purge mode.

A window appears on the display, which describes each step in purging mode.

In the first step, the process gas source valve must be closed.

On confirmation, the pre-purge program is run before the cylinder change, which completely flushes out the remaining process gas in the lines before removing all traces of the process gas source.

After confirmation, the process gas is removed either by relieving the pressure or using a vacuum generator, which was previously configured in the system configuration. The process gas removal has a fixed time value of 30 seconds.

The next step is the first purge cycle. In this process, pressure is first built up in the system with the aid of the purge gas.

The purge gas is then removed either by relieving the pressure or with the aid of a vacuum generator.

These steps are repeated according to the number set in the system configuration for the purge cycle.

After the purge run-throughs, it must be confirmed whether you are ready for the cylinder change. In the event of an unconfigured purge monitoring system, the purge sequence is to be monitored manually. In the event of malfunctions in the purge sequence, the process must not be continued.

After confirmation, the instruction is given to remove the connected process gas source.

Once the process gas source has been removed, it can be confirmed with OK. The instruction is given to connect the full process gas source.

If the new process gas source has been connected, this must be confirmed with OK.

The next step is the leak test. The purge gas is thereby admitted into the lines and allows a manual leak test of the connections.

With confirmation, the post-purge program takes place after the cylinder change, which flushes impurities and atmospheric air from the line before the process gas source valve is opened.

The next step is the first purge cycle. In this process, pressure is first built up in the system with the aid of the purge gas.

The purge gas is then removed either by relieving the pressure or with the aid of a vacuum generator.

These steps are repeated according to the number set in the system configuration for the purge cycle.

After the purge passes, confirm that the purge cycle is completed and the process gas source can be opened.

Note: If pressure monitoring and at the same time an alarm (empty message) is configured on digital input 1 or analogue input 1 and the process gas source valve is not open, then this alarm is activated as soon as it is confirmed with OK.

After confirmation, the system can be put back into operation.