IM-P402-44
AB Issue 15
16
LP30
LP30
Connection
thread
out of line
Water level
Minimum 40 mm (1 ")
Dimensions less
than 14 mm ( ")
Potentially hazardous
Minimum 14 mm ( ")
when installed
Correct
5.1 Introduction
To ensure safe, correct operation of the system, it is essential that the probe tip does not
touch any part of the boiler or protection tube. Standards require that the probe tip has at
least 14 mm ( ") clearance.
This test confirms that the LP30 probe is installed correctly. The test must be done on initial
installation, and each time the probe is removed from the boiler, e.g. for annual inspection.
A pair of 'checking wires' are used in conjunction with an Insulation Resistance Tester (meter)
to test if there is less than 14 mm ( ") radial clearance from the tip end. This is indicated
by a 'short circuit' (i.e. a reading less than infinity).
When correctly carried out, the test will ensure that the final probe tip position is at least
14 mm ( ") from the protection tube. See Figure 12.
5. Probe clearance test procedure
Fig. 12
Summary of Contents for LP30
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