Boiler house
Level controls
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.
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LC3050
Level Controller
TI-P402-135
AB Issue 6
Clamping
screw
Description
The Spirax Sarco LC3050 is a level limiting alarm for use in
conductive liquids as a high or a low alarm, and is defined as a
'special design water level limiter' in the context of EN 12952-11. It
is suitable for use with steam or hot water boilers operating up to
32 bar at 239°C.
The LC3050 is a dual voltage unit, 230 Vac or 115 Vac for use with
Spirax Sarco high or low level, self-monitoring high integrity probes.
The LC3050 has two LED’s, indicating normal and alarm conditions,
and a test button (AL). The other buttons on the keypad are non-
functional.
The unit can be panel, DIN rail or chassis mounted.
An automatic cyclic test of the probe, probe cable and controller is
carried out every few seconds by internally simulating a fault in the
probe.
A test button is fitted so that a full test of the probe, controller, and
associated circuits can be carried out. Provision is made for the
wiring of a remote test button if required.
WARNING; In most countries, steam boilers operating with
limited supervision require two self-monitoring level probes
and controllers to provide two independent low level alarms.
A high level alarm is also advised, and is compulsory in some
countries.
Principal features:
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SIL certification for the LC3050 / LP30 system.
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High integrity, self-monitoring low or high level alarm.
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Dual mains supply, 230/115 Vac.
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UL and TÜV approved.
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LED indication of status.
-
Infrared communications.
Approvals
An assessment upon the LP3050 / LP30 Low Level Alarm System
concluded it meets the requirements of IEC 61508-2:2010, to Saftey
Intergrity Level of SIL2 when used in a 1001 architecture and SIL3
when used in 1002 architecture.
This product complies with the Electromagnetic Compatibility
Directive 2004 / 108 / EC and all its requirements.
LC3050
ALARM
OK
AL
Function / Inputs / Outputs
Function
Alarm test
button
Clamping
screw
This product meets all the Requirements of the Directive and is
suitable for Class A Environments (eg Industrial). The LC3050 meets
the requirements of the Directive by meeting the Controlling
standard:
The LC3050 is normally configured to warn of a change in level
outside normal limits for steam or hot water boilers, tanks or vessels,
by de-energising an alarm relay. Spirax Sarco high-integrity, self-
monitoring probes can indicate internal faults or water ingress.
The LC3050 compares the resistance to earth from the probe,
through the water, to the boiler or vessel shell. If a change in water
level causes this resistance to change beyond a set limit, a timer
is engaged which alters the state of internal relays after a pre-set
delay. This signal is normally used to trigger an alarm, and cut the
supply to the burner.
Input / output
The product accepts inputs from the LP30 low level probe or the
LP31 high level probe.
With the water level normal the green LED will be lit, and the boiler
panel will indicate a normal water level. The green LED briefly
extinguishes every few seconds showing that the automatic cyclic
test is being carried out.
A compensation tip on the probe signals an alarm if the probe
should become faulty through water ingress or an internal wiring
fault.
Outputs can be remotely accessed via the RS485 / MODBUS
communications.
Other features
The LC3050 can communicate via an infrared link between
adjacent controllers. It enables the alarm status of the LC3050 to
be passed to a product fitted with RS485 (user). User products are
those fitted with a graphics display. The LC3050 is defined as a
slave unit. No set-up or adjustment is needed.
-
EN 61326-1: 2006 - Electrical equipment for measurement control
and laboratory use - EMC requirements Part 1: General
requirements.
In addition the LC3050 meets the EMC requirements of the following
standards:
-
EN 12953-9: 2007 - Shell boilers Part 9: Requirements for limiting
devices of the boiler and accessories.
-
EN 12952-11: 2007 - Water-tube boilers and auxiliary installations
Part 11: Requirements for limiting devices of the boiler and
accessories.
The product complies with Low Voltage Directive (2006 / 95 / EC)
by meeting the standards of:
-
EN 61010-1:2010 Safety requirements for electrical equipment for
measurement, control and laboratory use.
The LC3050 has been type-tested as a Special Design Water Level
Limiter by meeting the Standard:
-
Vd TÜV requirements for water level control and limiting devices,
Water Level 100 (07.2010).
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UL listed (open)
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