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INSTALLING AND REPLACING TEMPERATURE PROBES
The RTD temperature probes used with Nucleus assemblies are simple to install. On the valve body the temperature
probe is connected to the valve with a ¼” MNPT x ⅛”compression fitting. The remaining temperature probes, if
present, are installed into the pipe using a ½” MNPT x ⅛” compression fitting. Teflon tape and a small amount of
thread sealant should be used on the NPT side of the fittings. The ferrule, installed with the cone facing down, then sits
on the top of the compression inlet. The compression nut is then put over the ferrule and tightened slightly, just
enough to hold the ferrule in place. The RTD temperature probe is then inserted through the entire fitting until the
end of the probe reaches approximately the center of the desired measured water stream. Finally, the compression
nut is tightened by hand to “hand
-
tight” plus ⅛ to ¼ turn with an adjustable or open end wrench. Use caution not to
overtighten the fitting and only tighten until dripping stops.
In some instances, it may be easier to loosely install the probe into the compression fitting and then installing the
assembly a single piece.
NOTE: if overtightened, leaks are probable and the entire RTD and compression fitting must be replaced!
INSTALLATION OF COMPRESSION FITTING AND OUTLET RTD
PROBE ON 2” NUCLEUS VALVE BODY
¼” NPT x Compression Fitting
Ferrule
Compression Nut
RTD Probe with
10’ Lead Wire
