The Spirax Sarco CP10 is a conductivity probe specified for use in total dissolved solids (TDS) and conductivity control systems. It is a sealed unit consisting of a central stainless steel sensor tip, PEEK insulator, PTFE sealing ring, stainless steel body, disc springs, and washer.

Safety Warning

This product contains PTFE which can give off toxic fumes if exposed to excessive heat. Use of the product other than as a conductivity sensor could cause damage to the product and may cause injury or fatality to personnel.

Description

The sensor is threaded 3/8" BSP parallel for mounting in a sensor chamber, and has a 24 mm A/F hexagon. It is supplied with an S-type stainless steel gasket. Electrical connection is via an IP65 connector (supplied separately).

The CP10 sensor and PT2 plug tail are intended for use with a low voltage limited power source. These are approved by Underwriters Laboratory as Listed accessories for use with BC3200, BC3210, and BC1100 controllers (also compatible with BC3150 and BC3250).

Limiting Conditions

Parameter	Value
Body design	PN40
Maximum pressure / temperature	32 bar g at 239°C (464 psi g at 462°F)
Designed for a maximum cold hydraulic test pressure of	60 bar g (870 psi g)
Minimum conductivity	generally 10 μS/cm or 10 ppm

Installation

Caution

Do not install the sensor outdoors without additional weather protection. Ensure the PT2 wire is not exposed to a temperature greater than 120°C (248°F).

Fit the sensor chamber in a vertical or horizontal pipeline with suitable isolation valves to allow inspection/cleaning of the sensors. Reducers may be fitted if required. Flow can be in either direction. The sensors themselves must be horizontal.

The CP10 sensor is provided with an S-type stainless steel gasket for sealing. PTFE tape may be used on the CP10 threads, but check that the resistance to earth is less than 1 Ω after installation. Fit the sensors to the chamber and tighten to a torque of 60 N m (44 lbf ft).

Fit PT2 plug tail (or other Spirax Sarco plug tail) to the CP10 sensor and tighten.

Ensure the sensor body to pipework/boiler shell resistance is less than 1 ohm.

Electrical Installation

Electrical Rating	Value
Maximum voltage	20 Vdc, 14 Vac
Maximum current	10 mA

Maintenance

We recommend that the CP10 is removed for cleaning and inspection at least once a year, though the frequency of maintenance will depend on the quality and flowrate of the boiler water or condensate.

• Isolate and depressurise the system, (or with the system empty), remove the CP10.
• Clean the sensor tip with fine wet-or-dry paper, and the insulator with a cloth or bristle (not wire) brush.
• Inspect the insulator and sensor tip for erosion, damage, or pitting, and refit or replace as necessary.
• Retighten the CP10 to a torque of 60 N m (44 lbf ft). Note: Always fit a new gasket.

Available Spares

Description	Stock No.	Quantity
Gasket	0957191	Pack of 10
CP10 and gasket	0861079	Set of 1