Spirax Sarco CP32 User manual

IM-P403-58 AB Issue 14 1
1. Safety information
2. General product
information
3. Installation
4. Wiring diagrams
5. Maintenance
6. Spare parts
7. Fault nding
© Copyright 2016
Printed in GB
IM-P403-58
AB Issue 14
4031350/14
CP32
Conductivity Probe
Installation and Maintenance Instructions

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Safe operation of these products can only be guaranteed if they are properly
installed, commissioned, used and maintained by qualified personnel (see
Section 1.11) in compliance with the operating instructions. General installation
and safety instructions for pipeline and plant construction, as well as the proper
use of tools and safety equipment must also be complied with.
Do not install the probe outdoors without additional weather protection.
Drain / vent holes must be kept clean - do not cover.
1.1 Intended use
Referring to the Installation and Maintenance Instructions, name-plate and
Technical Information Sheet, check that the product is suitable for the intended
use / application. The products comply with the requirements of the European
Pressure Equipment Directive 97 / 23 / EC and fall within category 'SEP'.
It should be noted that products within this category are required by the directive
not to carry the mark.
i) The products have been specifically designed for use on steam and water,
which are in Group 2 of the above mentioned Pressure Equipment Directive.
The products’ use on other fluids may be possible but, if this is contemplated,
Spirax Sarco should be contacted to confirm the suitability of the product for
the application being considered.
ii) Check material suitability, pressure and temperature and their maximum and
minimum values. If the maximum operating limits of the product are lower than
those of the system in which it is being fitted, or if malfunction of the product
could result in a dangerous overpressure or overtemperature occurrence,
ensure a safety device is included in the system to prevent such over-limit
situations.
iii) Determine the correct installation situation and direction of fluid flow.
iv) Spirax Sarco products are not intended to withstand external stresses that
may be induced by any system to which they are fitted. It is the responsibility
of the installer to consider these stresses and take adequate precautions to
minimise them.
v) Remove protection covers from all connections and protective film from all
name-plates, where appropriate, before installation on steam or other high
temperature applications.
1.2 Access
Ensure safe access and if necessary a safe working platform (suitably guarded)
before attempting to work on the product. Arrange suitable lifting gear if required.
1.3 Lighting
Ensure adequate lighting, particularly where detailed or intricate work is required.
1. Safety information

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1.4 Hazardous liquids or gases in the pipeline
Consider what is in the pipeline or what may have been in the pipeline at some
previous time. Consider: flammable materials, substances hazardous to health,
extremes of temperature.
1.5 Hazardous environment around the product
Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases,
extremes of temperature, hot surfaces, fire hazard (e.g. during welding), excessive
noise, moving machinery.
1.6 The system
Consider the effect on the complete system of the work proposed. Will any proposed
action (e.g. closing isolation valves, electrical isolation) put any other part of the
system or any personnel at risk?
Dangers might include isolation of vents or protective devices or the rendering
ineffective of controls or alarms. Ensure isolation valves are turned on and off in
a gradual way to avoid system shocks.
1.7 Pressure systems
Ensure that any pressure is isolated and safely vented to atmospheric pressure.
Consider double isolation (double block and bleed) and the locking or labelling of
closed valves. Do not assume that the system has depressurised even when the
pressure gauge indicates zero.
1.8 Temperature
Allow time for temperature to normalise after isolation to avoid danger of burns.
If parts made from the PTFE have been subjected to a temperature approaching
260 °C (500 °F) or higher, they will give off toxic fumes, which if inhaled are likely
to cause temporary discomfort. It is essential for a no smoking rule to be enforced
in all areas where PTFE is stored, handled, or processed as persons inhaling
the fumes from burning tobacco contaminated with PTFE particles can develop
'polymer fume fever'.
1.9 Tools and consumables
Before starting work ensure that you have suitable tools and/or consumables
available. Use only genuine Spirax Sarco replacement parts.
1.10 Protective clothing
Consider whether you and / or others in the vicinity require any protective clothing
to protect against the hazards of, for example, chemicals, high / low temperature,
radiation, noise, falling objects, and dangers to eyes and face.

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1.11 Permits to work
All work must be carried out or be supervised by a suitably competent person.
Installation and operating personnel should be trained in the correct use of the
product according to the Installation and Maintenance Instructions.
Where a formal 'permit to work' system is in force it must be complied with. Where
there is no such system, it is recommended that a responsible person should know
what work is going on and, where necessary, arrange to have an assistant whose
primary responsibility is safety.
Post 'warning notices' if necessary.
1.12 Handling
Manual handling of large and/or heavy products may present a risk of injury. Lifting,
pushing, pulling, carrying or supporting a load by bodily force can cause injury
particularly to the back. You are advised to assess the risks taking into account the
task, the individual, the load and the working environment and use the appropriate
handling method depending on the circumstances of the work being done.
1.13 Residual hazards
In normal use the external surface of the product may be very hot. If used at the
maximum permitted operating conditions the surface temperature of some products
may reach temperatures of 350 °C (662 °F).
Many products are not self-draining. Take due care when dismantling or removing
the product from an installation (refer to 'Maintenance instructions').
1.14 Freezing
Provision must be made to protect products which are not self-draining against
frost damage in environments where they may be exposed to temperatures below
freezing point.
1.15 Disposal
Unless otherwise stated in the Installation and Maintenance Instructions, this
product is recyclable and no ecological hazard is anticipated with its disposal
providing due care is taken, except:
PTFE:
- Can only be disposed of by approved methods, not incineration.
- Keep PTFE waste in a separate container do not mix it with other rubbish, and
consign it to a landfill site.
1.16 Returning products
Customers and stockists are reminded that under EC Health, Safety and
Environment Law, when returning products to Spirax Sarco they must provide
information on any hazards and the precautions to be taken due to contamination
residues or mechanical damage which may present a health, safety or environmental
risk. This information must be provided in writing including Health and Safety data
sheets relating to any substances identified as hazardous or potentially hazardous.

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2.1 Application
The Spirax Sarco CP32 conductivity probe is used in conjunction with a controller to measure
the conductivity (closely related to TDS) of water, usually in a steam boiler, for the purpose
of monitoring and controlling blowdown.
2.2 Description
The CP32 is supplied in three nominal tip lengths, and has a " BSP thread ( " NPT
available) for connecting to a Spirax Sarco probe elbow, a screwed flange, or directly into a
boiler connection.
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 disintegrate, 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 is present on a probe, it indicates
scaling is also occurring inside the boiler, and a competent water treatment specialist
must be consulted to avoid a potentially dangerous situation.
The CP32 is approved by Underwriters Laboratory (UL) as an accessory for use with the
blowdown controllers. These controllers supply the CP32 with a low voltage limited power
source. The UL maximum electrical ratings for the probe are 24 Vdc and 14 Vac at 10 mA.
2.3 Available tip lengths mm (inches)
300 (11.8), 500 (19.7) and 1 000 (39.4)
Note: 1 000 mm probes must only be installed vertically.
2.4 Pressure / temperature limits
Maximum boiler pressure 32 bar g (464 psi g)
Maximum operating temperature 239 °C (462 °F)
Maximum ambient temperature 55 °C (131 °F)
2.5 Technical data
Minimum tip distance from boiler tubes 10 mm (")
Minimum immersion depth (vertically installed probes ) 100 mm (4")
Maximum cable length (probe to controller) 100 m (330 ft)
Minimum conductivity 10 µS/cm or 10 ppm
2. General product information

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Fig. 1
" BSP (½" NPT)

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The CP32 is supplied in nominal tip lengths of 300, 500, or 1000 mm, (12", 20" and 39") and
cannot be cut to length.
300 mm and 500 mm probes can be installed vertically or horizontally.
CAUTION: 1 000 mm probes must be installed vertically only.
WARNING: Do not install the probe outdoors without additional weather protection.
WARNING: The boiler must be depressurised and vented to atmosphere before
installation of the probe. Wherever possible the boiler manufacturer must be
consulted for advice on the positioning of the probe and the optimum TDS level.
Always install the probe:
-In a position where it can sense the conductivity of the boiler water.
-As far away from the feedwater inlet as possible.
-As near to the centre line of the boiler as possible. This lowers the risk of it being in the
steam bubbles normally found towards the top of the boiler, or in the higher concentration
of suspended solids found at the bottom of the boiler.
Note: The tip of the probe must be 10 mm ( ") away from any boiler tubes and project at
least 55 mm (2 ") into the boiler. It may be necessary to make up a stand-off for certain
installations in order to achieve these measurements. Vertically installed probes must be
immersed to a minimum depth of 100 mm (4").
3. Installation
Probe tip
10 mm ( ") minimum
Probe body Enclosure
Cable gland
Fig. 2 Installation diagram
55 mm
(2 ")
minimum

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Install the probe as follows:
-Ensure male and female threads are in good condition.
-Use up to three turns (no more) of PTFE thread sealing tape on the probe thread.
WARNINGS: Do not use excessive tape. Do not use paste type jointing compound.
-Fit and tighten the probe by hand initially. Use a suitable spanner to tighten the probe.
-Due to the nature of a taper/parallel joint it is not possible to recommend tightening torque
figures.
-Do not overtighten - there should always be visible thread on the probe.
Note: The probe thread will not 'bottom out' (i.e. probe body hexagon contacts the face of the
female screwed connection), unless there is excessive wear or an out-of-tolerance female
thread, in which case it will be necessary to replace or re-work the flange or connection.
-Take care not to damage the probe insulation sleeve when fitting the probe to the boiler.
Subsequent removal and refitting:
WARNING: Ensure boiler or vessel is depressurised and vented to atmosphere before
attempting to unscrew or remove the probe.
-Always use the correct size spanner.
-Inspect male and female threads for signs of damage, which may have occurred through
overtightening, leading to torn threads or even localised cold welding (galling/picking up).
-If damage has occurred replace the probe.
-Check that the probe insulation is not torn or damaged.

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4. Wiring diagrams
Cabling should be installed in accordance with BS 6739 - Instrumentation in Process
Control Systems : Installation design and practice or local equivalent. For US and Canadian
installations the probe must be wired in accordance with the National and Local Electrical
Code (NEC) or the Canadian Electrical Code (CEC). The UL product must be powered by
either a NEC Class 2 power source, NEC Limited Power source (LPS) or a UL / IEC 61010-1
limited energy circuit. An 8-way terminal block is provided in the terminal head to simplify
wiring.
Wiring should be carried out using 7 core, 1 mm²(18 AWG), high temperature screened cable,
with a maximum length of 100 metres (330 ft). Pirelli FP 200 or Delta Crompton Firetuf OHLS
are two suitable types for the standard CP32.
For US and Canadian installations, Class 1 screened cable with a suitable temperature rating
(75 °C / 167 °F minimum) must be used for the wiring.
Connect the wiring and screens as shown in the diagrams below.
Caution: Do not connect any wires to the smaller (five-way) terminal block, as
it houses the very fine wiring from the probe which could be easily damaged in
attempting to connect additional wires.
Fig. 3 Wiring layout
   
   
!Warning
This product is electrically rated to: 24 Vdc / 14 Vac
10 mA

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Driver tip Sensor tip Earth feedback Earth Feedback Return Drive
BC3200 / BC3210 controller
Screen
12345678 9 10
123456
78CP32 terminal
block TBK2
Probe Pt100
Fig. 4 Wiring diagrams
Ensure resistance from probe body to
pipework/boiler shell is less than 1 .
CP32 terminal
block TBK1
Driver tip Sensor tip Earth feedback Earth Feedback Return Drive
BC3150 / BC3250 controller
123456
78CP32 terminal
block TBK2
Probe Pt100
Fig. 5 Wiring diagrams
Ensure resistance from probe body to
pipework/boiler shell is less than 1 .
CP32 terminal
block TBK1
50 51 52 53 54 55 58 57 56 59
Screen
Screen

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There are no available spare parts for this product.
6. Spare parts
The probe does not normally need regular maintenance. Remove, clean, and check the
probe annually.
We also recommend that if the controller ever indicates a fault condition for over 12 hours
that it is removed, checked, and cleaned.
If scale should start to form on the probe, then it will normally be removed/made conductive
by the automatic conditioning system. However, this system is not a substitute for adequate
water treatment. It is still possible that under very severe conditions the probe may need
extra cleaning.
To clean the probe tip manually
Probe body cleaning instructions - Use a cloth dampened with tap / de-ionised water or
isopropyl alcohol. Use of other cleaning materials could damage the product and invalidate
the warranty.
Caution: The probe contains no user-serviceable components - any attempt to dismantle
the unit will result in permanent damage.
Remove the probe and clean with a wet cloth. For hard scale, fine wet-or-dry paper (600
grit maximum coarseness) may be used on the tip. Do not use abrasives on the sleeve.
If excessive corrosion occurs at the probe tip, it may be necessary to replace the probe.
Refit the probe using PTFE tape rather than paste-type compound. See Section 3
'Installation'.
5. Maintenance

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7. Fault finding
Problems experienced during commissioning are often found to be due to incorrect wiring or
setting up, so we recommend that a thorough check is first carried out.
Checking probe condition using the probe cell constant:-
The BC3200, BC3210 or BC3250 controllers have a facility which allows the condition of the
probe driver tip to be checked without removing the probe from the boiler. This is done by
calculating an approximation of the probe cell constant, an indication of the probe condition.
A probe driver tip which is functioning correctly without excessive scaling will have a cell
constant of between 0.2 and 0.6. See the 'Fault finding' Section of the BC3200, BC3210 or
BC3250 Installation and Maintenance Instructions for details.
The sensor tip condition cannot be checked by using either one of the following blowdown
controllers BC3200, BC3210 or BC3250: but it can be checked by using the MS1
conductivity meter.
Checking the probe condition using the MS1:-
The condition of an installed probe can be checked by using a Spirax Sarco MS1 conductivity
meter and its extension lead.
Driver tip:
-Connect the MS1 extension lead between terminal 1 and terminal 3.
-Use the reading to calculate the driver tip cell constant as described in the MS1
instructions. A cell constant in the region of 0.2 to 0.6 would indicate that the probe is
working correctly. A high figure indicates that the probe is scaled.
Sensor tip:
-As for driver tip, but connect the MS1 between terminals 2 and 3.
A sensor tip cell constant of 0.2 to 0.6 is normal, but a figure up to 0.8 is satisfactory.
Pt100 resistance check:
-The power must be off for this check.
-Measure the resistance between terminal 7 and terminal 8. A conventional ohm meter
may be used for this test. Resistance should be between 100 ohms (0 °C / 32 °F) and
168 ohms (180 °C / 356 °F). Terminal 3 should be earthed to the probe body.

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