IM-P693-13 EMM Issue 2
7
CP42 Conductivity Probe
Install the probe as follows:
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Ensure male and female threads are in good condition.
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Use up to three turns (no more) of PTFE thread sealing tape on the probe thread.
WARNINGS: Do not use excessive tape. Do not use paste type jointing compound.
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Fit and tighten the probe by hand initially. Use a suitable spanner to tighten the probe.
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Due to the nature of a taper/parallel joint it is not possible to recommend tightening torque figures.
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Do not overtighten - there should always be visible thread on the probe.
Note: The probe thread will not 'bottom out' (i.e. probe body hexagon contacts the face of the female
screwed connection), unless there is excessive wear or an out-of-tolerance female thread, in which case
it will be necessary to replace or re-work the flange or connection.
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Take care not to damage the probe insulation sleeve when fitting the probe to the boiler.
Subsequent removal and refitting:
WARNING: Ensure boiler or vessel is depressurised and vented to atmosphere before attempting
to unscrew or remove the probe.
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Always use the correct size spanner.
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Inspect male and female threads for signs of damage, which may have occurred through overtightening,
leading to torn threads or even localised cold welding (galling/picking up).
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If damage has occurred replace the probe.
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Check that the probe insulation is not torn or damaged.
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