Parts Replacement; Flow Controller; Power Supply Pc Board - Ametek 303B User Manual

Parts Replacement

Flow Meter Tubes (Figure 5-1)
1. Turn off power using front panel switch and disconnect the unit from
the power source.
2. Shut off sample flow at the source and purge the line. Shut off purge.
3. Remove the screws and lift off the cover.
4. Disconnect the "U" tube between the top fittings.
5. Remove the two screws and the plastic cover from the assembly.
6. With a hex wrench, loosen the plug over the glass tube in the assem-
bly top and remove the tube. Using a piece of tape on the glass makes
replacement easier.
7. Be sure the glass tube is centered on the top and bottom seals and the
grounding wire is around the tube before tightening the top plug.

NOTE
Flow Controller (Figure 5-1)
1. To gain access, perform steps 1, 2 and 3 above under Flow Meter Tubes
section.
2. Loosen the two tubing ferrule nuts at the flow controller and discon-
nect the lines.
3. Remove the mounting nuts and lift out the flow controller and brack-
et.
4. Remove the screw and remove the flow controller from the bracket.
Power Supply PC Board (Figure 5-1)
1. To gain access, perform steps 1, 2 and 3 above under Flow Meter Tubes
section.
2. Loosen the screws and remove the power-in wires from J1; remove
Do not tighten the screws on the plastic cover or the cover might
break.
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Maintenance 5-3