Reassembling Frg-702 - Agilent Technologies FRG-700 User Manual

Technical Information

Reassembling FRG-702

1 Insert the Pirani element (13) with the screw fitting (13a) and copper seal (13b)
slid over it into the corresponding conic bore hole (7) of the measuring
chamber.
2 Tighten the screw fitting (13a) with your fingers while slightly pushing the Pirani
element against the mechanical stop. Then tighten the screw fitting by one turn
with the open-end wrench.
3 Insert a new metal seal (11) incl. the centering ring (12) centered into the
measuring chamber (7).
4 Carefully insert the anode (10) with the ignition aid (10a) and extension piece
(9a) slid onto it into the measuring chamber.
5 Carefully place the pressure piece (9) on the measuring chamber.
6 Insert the four hexagon socket screws (8) incl. lock washers (8a) and tighten
them uniformly until the mechanical stop is reached.
7 Carefully slide the insulator (9b) onto the pressure piece (9) and lock it with the
hexagon socket set screw (9c).
8 Position the ignition aid (10a) by pushing the mounting tool over the anode pin
until the mechanical stop is reached.
9 Blow the particles in the measuring chamber with dry nitrogen (be careful to
hold the measuring chamber with the flange pointing downwards).
10 Slide the polarity insert (6) into the measuring chamber until the mechanical
stop is reached.
11 Place the circlip (5) snugly fitting on the polarity insert.
Visually check that the anode pin is centered over the middle hole of the polarity
NOTE
insert (max. eccentricity = 0.5 mm).
42 Agilent Inverted Magnetron Pirani Gauge FRG-700 and FRG-702 User Manual