Pipe to tube elbow
Worm shaft collar
Contactor needle bushing
(g) Disconnect the tube coupling nut
diaphragm. Too much air leakage causes the silver
that connects the copper tubing (57,
button of the diaphragm to touch the silver contact of the
needle assembly, thereby closing an electrical circuit.
(h) Disconnect the tube coupling nut
This circuit is referred to as diaphragm switch S1 on the
that connects the copper tube (14,
14) of the diaphragm switch S1 is on top of the calibrator
(i) Disconnect the tube coupling nut
housing (8) and the other terminal lug (17) is at the end
that connects the copper tube (39,
of the needle assembly (15). The two plug cocks (43
(j) Remove two screws (34) and
and 45) serve as a means to attach the water
manometer to the calibrator assembly so that the
calibrator housing (8) to the chassis
vacuum or pressure balance on the two sides of the
diaphragm may be checked.
( k ) Remove the calibrator assembly
from the chassis base.
(a) Remove the chassis assembly (TM
(35) that secure the calibrator
(b) Remove the balance orifice holder
bracket (16) to the calibrator
housing (8). Remove the bracket
with the parts assembled to it.
remove the terminal lug (7) with its
(b) Loosen the setscrew (26) and
remove the worm shaft collar (27)
attached wire from the needle
from the worm shaft (21).
(d) Remove the screw (6) and remove
the terminal lug (7) with its attached
wire from the calibrator housing (8).
The setscrew (28) is used as a stop.
(e) Loosen the setscrew (35, fig. 3) and
Since it is secured with electrical
pull the knob (6) from the end of the
insulating compound (glyptal), do not
remove it unless it is loose or
(f) Loosen the shaft lock (37, fig. 3) and
remove the two drive screws (36)
(c) Use a nail set or punch and drive
which secure the shaft lock to the
the pin (30) from the worm (24) and
front panel (42). Remove the shaft
the worm shaft (21). Hold the worm
lock from the front panel.
and pull the worm shaft from the
worm and through its mounting
holes in the calibrator bracket.