User`s guide

Routine Maintenance

250

and 0920-0093) are intended for operation up to 300 °C. See High

Temperature Operation on page 215 for further details.

We recommend replacing the grip-seal o-ring whenever the tube-

seal o-ring is replaced.

To replace the sealing o-rings:

1. Make certain that the TD is in Standby. Turn off the TD

and disconnect it from the AC line power.

2. If necessary, allow the instrument to cool.

3. On the ATD, remove the carousel. Loosen the carousel's

two securing thumbscrews.

4. If a tube is in the load position, then remove it. Push

down on the tube until the top of the tube is free of the

fixed seal. You can then remove the tube from the

system.

WARNIN

The heated valve, the tube oven, and the trap enclosure may

be very hot. Allow 20 -30 minutes for these parts to cool.