Campbell Hydrosense, Instruction Manual

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HydroSense
14
The friction between the rod collar and the insert surface along with thread
friction will generally provide good rod attachment and loosening is unlikely.
If rod loosening does occur, a thread coating compound can be used to enhance
friction. There are two thread compounds that laboratory testing indicates
minimal effect on the HydroSense measurement.
A package with Loctite

222MS THREADLOCKER is included with each
CS620 probe. There is enough thread coating to treat several rods. The
compound should be used sparingly as a thick coating will cause slightly higher
measured water content values.
Another product that works well is Vibra-Tite by ND Industries. This
compound has a higher viscosity than most thread coatings and a narrow strip is
painted on the threads. The applied compound must cure aerobically before the
rods are threaded into the probe inserts. The cured compound is a resilient
plastic which is reusable several times. It is important that the rod threads are
not completely coated because this can affect response of the probe.
Replacement of the rods is a simple matter of screwing the threaded end of each
rod into the insert of the probe body with attention to the following details.
•
Threads should be clean before rod attachment.
•
After screwing the rods into the probe threaded inserts to finger tight, use
pliers to apply a small force and give a snug fit.
•
Full contact between the rod collar and probe body is required for proper
operation.