IM-P693-13 EMM Issue 2
5
CP42 Conductivity Probe
Fig. 1
BSP 3/8"
2.1 Application
The Spirax Sarco CP42 conductivity probe is used in conjunction
with a controller to measure the conductivity (closely related
to TDS) of water, usually in a steam boiler, for the purpose of
monitoring and controlling blowdown.
2.2 Description
The CP42 is supplied in three nominal tip lengths, and has a 3/8"
BSP thread for connecting to a Spirax Sarco probe elbow, a
screwed flange, or directly into a boiler connection.
The CP42 has a built-in temperature sensor, and when used
with an appropriate controller, is able to detect scaling. It also
automatically initiates a probe conditioning cycle.
This causes any scale on the probe to become porous or
disintegrate, allowing the probe to continue to sense at its original
calibration level. WARNING: This feature is not a substitute for
a proper boiler water treatment regime. If scale is present
on a probe, it indicates scaling is also occurring inside the
boiler, and a competent water treatment specialist must be
consulted to avoid a potentially dangerous situation.
2.3 Available tip lengths mm (inches)
300 (11.8), 500 (19.7) and 1 000 (39.4)
Note: 1 000 mm probes must only be installed vertically.
2.4 Pressure/temperature limits
Maximum boiler pressure 32 bar g (464 psi g)
Maximum operating
temperature
239 °C (462 °F)
Maximum ambient
temperature
70 °C (158 °F)
2.5 Technical data
Minimum tip distance from
boiler tubes
10 mm (3/8")
Minimum immersion depth
(vertically installed probes )
100 mm (4")
See controller IMI for wiring diagrams and minimum
conductivity
Degree of protection IP54
2. General product information
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