Boiler house

Conductivity sensors

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 2015

2.5.3

TI-P403-59

AB Issue 8

CP32

Twin Tip Conductivity Probe

Description

The Spirax Sarco CP32 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 CP32 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 CP32 is supplied in three nominal tip lengths, and has a

" BSP male thread (1⁄2" NPT to special order) 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

2

(internal)

1

(462°F @ 464 psi g).

- Patented scale detection and compensation.

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.

5

4

3

Pressure/temperature limits

Maximum boiler pressure

Maximum operating temperature

Maximum ambient temperature

Technical data

Minimum tip distance from boiler tubes

Minimum immersion depth

(vertically installed probes)

Maximum cable length

(probe to controller)

Minimum conductivity

32 bar g

239°C

55°C

10 mm

100 mm

(464 psi g)

(462°F)

(131°F)

(0.4")

(4.0")

10

(328 ft)

μS/cm or 10 ppm

Type 316L

Type 304L 1.4306

302 S26

Type 316

UGINE 4632

Type 316 / 316L

100 m

10

Materials

No. Part

1

Terminal

head

2 'O' ring

3 Cover tube

4 Name-plate

5 Body

6 Spring

7 Insulator

8 Driver tip

9 Sensor tip

10 Rod

Material

Aluminium

Nitrile rubber

Austenitic stainless steel

Polycarbonate

Austenitic stainless steel

Austenitic stainless steel

PEEK

Austenitic stainless steel

Austenitic stainless steel

Austenitic stainless steel

6 and 8

(Internal)

9

7