PCM-2 Manual.pdf - Voss Associates

turret subassemblies once they are built.
8. Install the high voltage insulator washers and banana jack(s) through 1/2" diameter hole(s) in
the detector pan per print using one of two small drops of corona dope (GC #SO-2. RED X)
between the screw threads of the jack and the cup of the outer insulator washers as a sealant.
Tighten the banana jack nut until the insulator washers are secure (i.e. washers can not rotate).
9. Install the modified plastic quick-connect gas fittings or the modified brass street elbow/quickconnect
gas fitting assemblies into the 118" FPT holes 3-1/2 to 4 full turns into the detector
pan per print. Apply one or two wraps of thin (.003 thick) PTFE pipe thread sealing tape on
the threads of the fittings prior to installing. Be sure not to cross-thread the fittings in the
FPT holes nor to tighten them beyond the installation depth specified per print. Fitting ends
should not penetrate beyond .04" into chamber area.
NOTE:
Due to variances in the manufacture of the probe chambers the FPT threaded
holes may not he threaded deep enough to start the threads of the fittings. If this
situation occurs, re-tap the FPT holes with a 1/8" standard tapered pipe thread
tap in increments of one additional thread at a time as required to be able to
start the threads of the fitting. If the fitting is not tight upon reaching the
maximum allowable installation depth per print, simply use an additional wrap of
pipe thread sealing tape.
10. Apply 1/2" dia. PTFE tape dotes) to internal press stud head(s) and secure by rubbing finnly
with a blunt rounded tool.
11. Place the 11534-B576 anode wire spring immobilization tools over each of the wire end turret
assemblies to inhibit the anode wire spring's rotational movement (Reference detail "A" on
assembly print). This will ease the subsequent anode wire - to - anode wire spring soldering
operations.
12. Solder the PTFE-coated high voltage jumper wire(s) to the banana jack(s) and nearest anode
wire springes) per print. String with .00 I in. diameter stainless steel anode wire by first
soldering one end of the wire to the anode wire spring at the wire end turret nearest the high
voltage connection and then by stringing the entire electrical channel around each set of turret
assemblies to the other wire end position. Be careful to string the anode wire around the
recessed center of the brass spindle at each turret assembly and not at the gap between
the spindle and the post or cap. Lightly stretch the anode wire around the turret and tben
make a 360 degree wrap around the spindle of the adjacent turret. Make 4 to 8 of these anode
wire-to-turret spindle "wraps" per detector channel to achieve and preserve adequate anode
wire tension. Again take note that the anode wire is wrapped around the recess in the brass
spindle at every turret. Complete anode wire stringing by soldering it to the other anode wire
spring white maintaining adequate wire tension. Completed solder joints should have no sharp
points. Trim off loose anode wire ends with cutters directly at the joint.
11000-A308/PCM-2 Oet. Assy. Procedure/Revision/March 1994 4