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2.5.1 Probes are supplied fully assembled. Probe receptacles on the water
column are ½” swaged fittings.
2.5.2 To ensure the probes remain clean, mount the receptacles so the probes
are exposed to mild fluid circulation. Do not locate the probes in high
velocity steam or water. Probes may be located horizontally or vertically
with the electrical connection up.
2.5.3 Ensure that the receptacle and probe retaining nut threads and sealing
surfaces are clean. The threads on the receptacle and probe retaining
nut should be lubricated with an anti-seize compound to prevent galling
and lower the tightening torque on the threaded parts. Recommended
compounds include:
Silver Goop (Swagelok trade name)
MP-50 Moly Paste (Jet Lube of Canada)
Never-Seez (trade name)
2.5.4 Insert the probe into the receptacle and tighten the probe retaining nut by
hand. With a wrench, further tighten the nut ¼ turn only. Subsequent
connections will be made in a similar manner.
2.6 Wiring (refer to figures 4 and 5)
Note: All wiring should be in accordance with applicable national
and local codes by qualified personnel.
2.6.1 At the Probes
If the column mounted junction box option is ordered, the unit is pre-
wired from the probes to the junction box mounted on the water column.
Probe to junction box wiring must be high temperature (e.g., mineral /
glass insulated or thermocouple wire).
The cabling between the standard off-column junction box and the
Electronic Module does not require any high temperature capability. It is
recommended, however, the cable should have an overall shield, 18-24
gauge tin or silver plated wire and have a minimum rating of 221°F,
[105°C]. If the junction box is located on the water column, higher
temperature wiring may be required.
The lowest probe on ALL
systems is numbered 1 and the corresponding
terminal in the Electronic Module is 1. Wire successively higher probes in
! C A U T I O N !
Before making any connections, make sure that the power source to be used is
isolated by use of the appropriate circuit breakers and switches so that no work
is being performed with “live wires”, otherwise personal injury or property
damage may result.