Boiler house Level controls
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Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2020
TI-P693-18 EMM Issue 1
LP41 High Integrity, Self-monitoring High Water Level Alarm Probe
Description The Spirax Sarco LP41 is used in conjunction with an LCS3051 level switch to provide a high integrity, self-monitoring alarm for detection of high water levels in steam boilers and other vessels. The probe is normally installed direct in the boiler shell in a protection tube, but can be mounted in an external chamber if regulations permit. The LP41 is supplied in three nominal tip lengths, and is cut to the exact length required prior to installation. In normal operation, the tip is above the water level, and has a high resistance path to earth. If the water level rises to touch the probe tip, the resistance to earth drops, causing the alarm relays in the controller to be de-energised and the alarm to sound. The LP41 is designed so that its tip and wiring connection integrity is monitored by the controller, causing an alarm signal in the event of a fault occurring. The LP41 can also be used as a simple (non self-monitoring) high or low level probe with an LC1350 level switch. A DIN 43650 cable socket with Pg 11 cable gland is supplied with the unit. Caution: The probe is not suitable for outside installation without additional environmental protection.
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Available tip lengths mm (inches) 500 (19.7"), 1 000 (39.4") and 1 500 (59").
Limiting conditions Nominal pressure rating
PN40
Maximum boiler pressure
32 bar g (464 psi g)
239 ° C (462 ° F)
Maximum temperature
70 ° C (158 ° F)
Maximum ambient temperature
Technical data Maximum probe cable length
See level switch/controller IMI
LCS1350
0.5 μS/cm
Minimum conductivity
LCS3051
10 μS/cm
Degree of protection
IP54
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