10
3.3 Commissioning the Generator
It is assumed that the system is configured with isolation valves on the
outlet of the generator and the inlet of the application instrument as shown
in “Recommended system layout” on page 8.
1
Ensure that the system piping is connected to the N
2
MFC outlet port
of the generator and the isolation valve is closed.
2
Disconnect the application instrument from the isolation valve and
close the valve.
3
Turn the generator on at the power switch and wait until it goes into
standby mode.
4
Press the
key on the control panel to start the generator.
Note.
If the gas is flowing from the N2 Out port rather than the N
2
MFC port, stop the generator and disconnect the power. Remove the
side panel from the generator and locate the MFC bypass valve. Move
valve handle to position
to direct the gas to the N
2
MFC outlet.
Refit the side panel to prevent access to the electrical equipment
when the generator is powered up. Repeat steps 1 - 4 before
continuing.
5
Check the pressure gauges on the front of the generator and verify
that the generator is pressurising.
6
Check the Mist–X exhaust to verify that the drain valve is discharging
on a regular basis. If the drain valve is blocked the generator will not reach purity.
7
Once satisfied that the generator is cycling correctly, slowly open the isolation valve on the outlet of the generator to pressurise the system
piping. Check for leaks and repair as required.
8
Open the isolation valve, normally connected to the application instrument, and allow the gas to flow to atmosphere.
9
Once the generator has reached its specified purity, and the system has been purged, the application instrument may be connected to the
system. Close the isolation valve on the outlet of the system and connect the application instrument.
10
If the application instrument uses its own MFC the system piping will need to be connected to the N
2
Out port not the N
2
MFC outlet port.
Close the isolation valve on the N
2
MFC outlet port and press
to put the generator into stand-by mode.
The generator will continue to run for up to 10 minutes in order to allow the cycle to complete and to ensure that the inlet piping and CMS
columns are fully de-pressurised. Once complete the generator will revert to stand-by mode.
11
Turn the generator off at the power switch and disconnect it from the electrical supply.
12
Disconnect the isolation valve from the N
2
MFC outlet port at connect it to the N
2
outlet. Fit the blanking plug into the N
2
MFC outlet port.
13
Reconfigure the MFC bypass valve so that the gas is delivered to the N
2
. Remove the side panel from the generator and locate the MFC
bypass valve. Move valve handle to position
to direct the gas to the N
2
outlet, and refit the side panel.
14
Reconnect the generator to the electrical supply and wait. When the generator reaches standby mode press
.
Ensure that the area is suitably ventilated during the commissioning stage as nitrogen will flow from the unterminated system piping.
It takes approximately 6 hours for the generator to reach the purity stated in “Technical Specification” on page 3. In addition the system
piping will need flushing for approximately 1 hour for every 10 metres of piping. Failure to do so could damage the application instrument.
