Spirax Sarco LP20 User manual

IM-P402-37 AB Issue 9 1
LP20
Capacitance Level Probe
Installation and Maintenance Instructions
IM-P402-37
AB Issue 9
Printed in the UK © Copyright 2012
1.Safetyinformation
2.Generalproduct
 information
3.HowtheLP20
 probeworks
4.Installation
5.Wiring
6.Maintenance
4024650/9

2IM-P402-37 AB Issue 9
1. Safety information
Safe operation of the product depends on it being properly installed, commissioned
and maintained by a qualified person (see Section 1.11) in compliance with the
operating instructions.
It is essential to comply with general installation and safety instructions for
pipeline and plant construction, as well as to make proper use of tools and safety
equipment.
The product is designed and constructed to withstand the forces encountered
during normal use. Use of the product for any other purpose, or failure to install
the product in accordance with these Installation and Maintenance Instructions,
could cause damage to the product, will invalidate the marking, and may cause
injury or fatality to personnel.
Additional Safety Notes
Level control and level limiting / alarm products in steam boilers
Products / systems must be selected, installed, operated, and tested in accordance with:
- Local or National standards and regulations.
- Guidance Notes, (Health and Safety Executive BG01 and INDG436 in the UK).
- The requirements of Approvals Authorities.
- Boiler inspection bodies.
- Boiler manufacturer’s specifications.
Two independent low water limiting / alarm systems must be installed on steam
boilers. Level probes must be installed in separate protection tubes / chambers,
with sufficient clearance between the tips, and earth.
Each probe must be connected to an independent controller. The alarm relays
must isolate the boiler heat supply at low alarm status.
A high water alarm may be part of the water level control, or a separate system.
An independent high water alarm system must be fitted if it is considered a
safety requirement. In this case, the relays must simultaneously isolate the
feedwater supply and the boiler heat supply at high alarm status. All boiler water
limiters / alarms require regular functional testing.
A suitable water treatment regime must be used to ensure continuous safe and
correct operation of the control and limiter / alarm systems. Consult the above
authorities and a competent water treatment company.

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Warning
Isolate the mains supply before unplugging the controller since hazardous
voltages will be exposed on the controller base. This product complies with
the requirements of Electromagnetic Compatibility Directive 89 / 336 / EEC and
93 / 68 / EEC by meeting the standards of:
- EN 61326 : 1997 A1 + A2 Emissions Class B equipment Table 4.
- EN 61326 : 1997 A1 + A2 Immunity for Industrial Locations Annex A.
The following conditions should be avoided as they may create interference above
the limits specified in EN 61326 (Immunity) if:
- The product or its wiring is located near a radio transmitter.
- Excessive electrical noise occurs on the mains supply. Power line protectors
(ac) should be installed if mains supply noise is likely. Protectors can combine
filtering, suppression, surge and spike arrestors.
- Cellular telephones and mobile radios may cause interference if used within
approximately 1 metre (39") of the vary according to the surroundings of the
installation and the power of the transmitter.
If this product is not used in the manner specified by this IMI, then the protection
provided may be impaired.
1.1 Intended use
i) Check that the product is suitable for use with the intended fluid.
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.
Safe operation of this product can only be guaranteed if it is 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.

4IM-P402-37 AB Issue 9
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.
1.4 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 the danger of burns.
For personal protection wear protective clothing, especially heavy duty gloves and
safety glasses.
PTFE:
If parts made from 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 suitable tools and / or consumables are 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.
Many products are not self-draining. Take due care when dismantling or removing
the product from an installation.
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
The product is recyclable. No ecological hazard is anticipated with the disposal of
this product 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.