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-P693-20 EMM Issue 1
CP42 Twin Tip Conductivity Probe
Description The Spirax Sarco CP42 conductivity probe is used in conjunction with a controller to measure the conductivity (or TDS) of water, usually in a steam boiler, for the purpose of monitoring and controlling blowdown. 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 fall off, allowing the probe to continue to sense at its original calibration level. WARNING: This feature is not a substitute for adequate boiler water treatment. If scale is occuring on a probe, it is also accuring inside the boiler, and a competent water treatment specialist must be consulted to avoid a potentially dangerous situation. The CP42 is supplied in three nominal tip lengths, and has a " BSP male thread for connection to a Spirax Sarco probe elbow, a screwed flange, or directly into a boiler connection. Principal features : - Twin tip conductivity probe for use in TDS control systems. - Built-in temperature sensor - only one boiler connection needed. - Suitable for use in steam boilers up to 239 ° C @ 32 bar g (462 ° F @ 464 psi g). - Patented scale detection and compensation.
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Available tip lengths mm (inches) 300 (11.8), 500 (19.7) and 1 000 (39.4). Note: 1 000 mm probes can only be installed vertically.
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)
Designed for a maximum cold hydraulic test pressure of:
60 bar g
Technical data Minimum tip distance from boiler tubes
10 mm
(0.4")
Minimum immersion depth (vertically installed probes)
100 mm
(4.0")
Maximum cable length (probe to controller)
See controller IMI
Minimum conductivity
10 µS/cm or 5 ppm
Degree of protection
IP54
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