Maintaining the Instrument
Changing the Sample Loop
94
Figure 21. The Sampling System
4. Use a 7-mm wrench to loosen the bolt holding the loop mandrel to the
manifold body, and remove the loop mandrel.
5. Slide the loop off the mandrel.
6. Slide the new loop over the mandrel and tighten the nuts to the six-port
valve. Reinstall the mandrel. Position the fiberglass insulator between the
manifold body and the loop mandrel.
Note When installing a Silcosteel
®
-treated sample loop, take care not to bend the
loop when installing it or you will break the coating and compromise inertness.
7. Perform a leak test on fittings before replacing the box and cover.
Disconnect sample
loop fittings from valve
Sample loop
Loop mandrel
Insulator
Manifold body
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