Spirax Sarco CP30 Conductivity Probe

2. General product information 2.1 Description
The Spirax Sarco CP30 probe is supplied in several nominal electrode lengths, and is cut
to the exact length required prior to installation. The probe has a " BSP taper (UL version
½" NPT) connection and may be installed in a probe elbow, a screwed flange, or directly in a
boiler connection.
The CP30 can be used with the BC3100, BC3200, BC3210, BC3150, and BC3250 blowdown
controllers, which have a probe cleaning facility.
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 a
proper boiler water treatment regime. If scale forms on a probe, it is also forming inside
the boiler, and a competent water treatment specialist must be consulted to avoid a
potentially dangerous situation.
The CP30 is approved by Underwriters Laboratory (UL) as an accessory for use with the
blowdown controllers. These controllers supply the CP30 with a low voltage limited power
source. The UL electrical ratings for the probe are 20 Vdc and 14 Vac at 10 mA.
2.2 Application
The CP30 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. A DIN 43650 cable socket is supplied with each unit and is provided
with a Pg 11 cable gland, or, for the UL Listed version, a ½" NPT conduit thread adaptor
with four flying leads.
2.3 Available electrode lengths mm (inches) 300 (11.8 ), 500 (19.7), 1 000 (39.4) and 1 500 (59.0).
2.4 Limiting conditions
Maximum boiler pressure Maximum temperature Maximum ambient temperature Minimum tip distance from boiler tubes
Minimum immersion depth (vertically installed probes) Maximum cable length (probe to controller)
Minimum conductivity
6
32 bar g (464 psi g) 239°C (462°F) 70°C (158°F) 20 mm (¾") 100 mm (4") 100 m
(330 ft) 10 µS / cm or 10 ppm
IM-P403-34 AB Issue 10