Routine Maintenance . 77
1. The tubing is connected to the instrument by a universal pipe fitting which is
secured to the tubing with a nut. Two sets of fittings are supplied with the
instrument. Assemble the fittings to the tubing as illustrated in Figure 23.
Figure 23 Purge fittings
2. Tighten the nut, ensuring it is not over tightened.
3. Push the connector on the end of the tubing into the purge connector of the
compartment to be purged (Figure 24).
Figure 24 Connector fitted to purge port
4. Connect the free end of the tubing to the gas regulator.
NOTE: Ensure the regulator is set to a pressure not greater than 6.9 kPa (1 lbf/in
2
).
5. Open the gas flow valve on the regulator until a flow rate of 28 L/minute
(1 ft
3
/minute) is achieved.
The instrument compartment is purged in 10 minutes. The sample compartment is
purged in 2 minutes.
6. Once purging is complete turn off the gas supply.
Beveled end
of connector
Knurled nu
ubin
Sam
le Pur
e Instrument Pur
e
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