User`s guide

Routine Maintenance

247

for the PTFE ferrules (P/N L427-5110) as graphite ferrules are

permeable to air.

Removing and Replacing the Front

Covers of the ATD

You may need to remove the front covers of the ATD in order to

install the transfer line, and perform a number of routine

maintenance tasks. The front covers consist of the arm housing and

the transfer line cover.

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

instrument and disconnect it from the AC line power.

2. If necessary, allow the instrument to cool.

3. Loosen the carousel cap nut and then remove the

carousel.

4. Remove the screw securing the arm housing to the

chassis. This screw is at the bottom of the decapping

station.

5. Loosen the two screws on the left side panel. You do not

have to remove the screws. You must loosen both

screws to loosen the case.

6. Slide the door latch to the left and free the arm housing

from the sides of the instrument and then slide it

outward.

7. You now have access to the tube handling mechanism,

to the heated valve and the cold trap enclosure.

WARNIN

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

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