Spirax Sarco CP32 is a dual-probe conductivity sensor. Constructed from austenitic stainless steel and equipped with an integrated temperature sensor, it supports maximum operating conditions of 32 bar g and 239°C, with scale detection compensation and an automatic cleaning cycle. Used with a BC3150 or BC3250 controller, it is designed for boiler water TDS blowdown control and continuous online conductivity monitoring.
Spirax Sarco CP32 dual-probe conductivity sensor, angled product view
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CP32 Dual-Electrode Conductivity Sensor | Spirax Sarco
Dual-electrode conductivity sensor for TDS blowdown control and continuous online monitoring of steam boiler water, compatible with BC3150/BC3250 controllers.
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Specifications
- Measured parameter
- Water conductivity (or TDS)
- Sensor type
- Dual-probe conductivity sensor
- Minimum conductivity
- 10 μS/cm or 10 ppm
- Boiler pressure and operating temperature
- Maximum 32 bar g; maximum 239°C
- Maximum ambient temperature
- 55°C
- Process connection
- 3/8 in BSP thread; optional 1/2 in NPT thread
- Probe lengths
- 300 mm, 500 mm, 1000 mm
- Installation orientation
- 300 mm and 500 mm types may be installed vertically or horizontally; 1000 mm type may only be installed vertically
- Minimum vertical insertion depth
- 100 mm
- Minimum distance from boiler fire tubes
- 10 mm
- Maximum cable length
- Sensor to controller: 100 m
- Temperature sensor
- Built-in
- Scale compensation function
- Scale detection compensation and automatic probe cleaning cycle
- Compatible controllers
- BC3150, BC3250
- Body material
- Austenitic stainless steel Type 304L (1.4306)
- Probe material
- Austenitic stainless steel Type 316 / 316L
Application scenarios
Steam boiler water TDS blowdown control
Used with a BC3150 or BC3250 controller, the CP32 measures steam boiler water conductivity or TDS and provides a basis for boiler blowdown control. It is a dual-probe conductivity sensor with an integral temperature sensor, suitable for steam boiler operating conditions up to 32 bar g and 239°C.
Continuous conductivity monitoring for scale-forming boilers
The CP32 can be used in scale-forming applications requiring continuous measurement of boiler water conductivity. When connected to an appropriate controller, it can detect scale on the probe and initiate an automatic probe cleaning cycle to loosen, make porous, or remove adhering scale, maintaining conductivity sensing performance at the initial calibration condition.
In-line conductivity monitoring through boiler shell connections
The CP32 can be installed directly in a boiler connection or connected to the boiler water space through a Spirax Sarco sensor elbow or threaded flange for in-line conductivity measurement. The 300 mm and 500 mm probes can be installed vertically or horizontally and feature a 3/8 in BSP threaded process connection, with an optional 1/2 in NPT thread.
FAQ
CP32How does the dual-probe conductivity sensor operate in a steam boiler TDS control system?
CP32When connected to a compatible controller, it continuously measures boiler water conductivity or TDS and provides a signal for boiler blowdown monitoring and control. Its built-in temperature sensor enables temperature compensation with the controller and supports sensor scale detection and automatic probe cleaning cycles, helping to maintain continuous conductivity measurement.
CP32Which Spirax Sarco controllers can be used with it?
CP32It can be connected to Spirax Sarco BC3150 or BC3250 controllers for steam boiler TDS control. When the system detects scale on the sensor, the controller can perform the automatic probe cleaning function; if cleaning is not performed, a controller panel alarm or remote alarm can be triggered.
CP32How should probe length and boiler connection be selected?
CP32It is available in three probe lengths: 300 mm, 500 mm, and 1000 mm. The boiler connection is available with a 3/8 inch BSP thread; a 1/2 inch NPT connection must be specified when ordering. Selection should be confirmed according to the boiler connection type, installation orientation, and required insertion depth. The minimum insertion depth for vertical installation is 100 mm.
CP32What are the installation orientation and location requirements?
300 mm and 500 mm probes may be installed vertically or horizontally, while the 1000 mm probe may only be installed vertically. The installation location should be as far as possible from the boiler feedwater inlet while ensuring the probe can effectively sense boiler water conductivity. The minimum distance between the probe and boiler fire tubes is 10 mm. The equipment must not be installed outdoors without protection.
CP32Is boiler water treatment still required when scale compensation is provided?
Yes. CP32 scale detection and automatic cleaning cycle can reduce the effect of scale on the sensor surface, but cannot replace boiler water treatment. Scale on the sensor generally indicates that scale may also be present inside the boiler. Water treatment conditions should be improved promptly to avoid affecting safe boiler operation.