Maintenance . 105
Figure 90 Tubing connected to instrument purge inlet port
11. Connect the free end of the inlet tubing to the gas regulator.
NOTE: Ensure the regulator is set to a pressure not greater than 6.9 kPa (1 lbf/in
2
).
12. Repeat steps 6–10 to connect the other piece of tubing to the instrument purge outlet
port (Figure 89).
Although you
must
remove the bolt from the outlet port before passing gas through the
inlet port, it is not necessary to connect the outlet tubing if you do not need to vent the
gas outside the operating environment.
Figure 91 Tubing connected to instrument purge inlet port
13. Feed the purge outlet tubing through the tubing clip and the outlet port and position it
to vent to a suitable location (for example, a fume hood).
14. Open the gas flow valve on the regulator until a flow rate of 2 L/minute
(0.07 ft
3
/minute) is achieved.
It will take about 10 minutes to fully purge the instrument optics.
15. When you have finished work, turn off the gas supply.
16. Release the tubing from the instrument purge inlet port and, if fitted, from the purge
outlet port.
To release the tubing, pull back the spring fitting on the connector and then gently pull
the tubing out.
17. For a temporary seal, fit the blanking bolts supplied into the right-angled connectors.
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