The Spirax Sarco LC3050 boiler high/low level alarm controller is an alarm device designed specifically for conductive liquids, featuring self-monitoring fail-safe control. The controller can operate under a maximum operating limit of 32 bar at 239 °C, is used with LP30/LP31 sensors, and supports RS485 and infrared communication. It is suitable for steam or hot water boilers, water tanks, and vessels, meets heavy industry electromagnetic compatibility environments and standards such as EN 12952-11, and is commonly used for self-monitoring low water level alarms on steam boilers and high level alarm circuits on hot water boilers.
LC3050 product photo
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Spirax Sarco LC3050 Boiler High/Low Level Alarm Controller
Boiler high/low level alarm controller with self-monitoring fail-safe control.
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Specifications
- Control function
- Conductive liquid high/low level alarm, self-monitoring fail-safe control
- Applicable equipment
- Steam or hot water boilers, water tanks or vessels
- Operating limit
- 32 bar at 239 °C
- Compatible level sensors
- LP30 low level sensor, LP31 high level sensor
- Minimum medium conductivity
- 30 μS/cm or 30 ppm (25 °C)
- Supply voltage
- 220/240 Vac (198-264 V) or 110/120 Vac (99-132 V)
- Supply frequency
- 50-60 Hz
- Power consumption
- 230 V / 30 mA or 115 V / 60 mA
- Relay output
- 2 × single-pole changeover relays (SPCO)
- Relay rated voltage
- Maximum 250 Vac
- Relay resistive load
- 3 A at 250 Vac
- Relay inductive load
- 1 A at 250 Vac
- Communication interface
- RS485 / MODBUS; infrared communication
- Infrared communication specifications
- IrDA, 38400 baud, range 10 cm, working angle 15°
- Installation method
- Panel mounting, DIN rail mounting, or baseplate mounting
- Ambient temperature range
- 0-55 °C
- Protection rating
- Front panel IP65; installation enclosure minimum IP54
- Level sensor cable
- High temperature shielded 4-core cable, 1-1.5 mm² (18-16 AWG), maximum length 50 m
- EMC environment
- Suitable for heavy industrial locations
- Safety and type standards
- EN 61010-1, UL61010-1, CAN/CSA C22.2 No. 61010-1, EN 12952-11:2007, Vd TÜV 100 (07:2006)
Application scenarios
Steam boiler self-monitoring low water level alarm
For steam boiler low water level limiting and alarm circuits, used with the LP30 low level sensor to detect low level conditions, and performs periodic self-testing of the sensor, cable, and control circuit through the controller.
Hot water boiler high level alarm
For hot water boiler high level alarm circuits, used with the LP31 high level sensor to detect when conductive boiler water reaches the high level detection point and issue an alarm.
FAQ
What level monitoring scenarios is the LC3050 level controller suitable for?
The LC3050 is used for high or low level alarming of conductive liquids, suitable for level over-limit alarming on steam boilers, hot water boilers, water tanks, and vessels. Its operating limit is 32 bar at 239 °C; the specific configuration must be confirmed according to the actual model and application conditions.
What is the level detection principle of the LC3050?
The LC3050 determines the level condition by comparing the resistance to ground from the level sensor through the water to the boiler or vessel shell. When the resistance exceeds the setpoint and after a preset delay, the internal relay switches, which can be used to trigger an alarm or cut off the burner power supply.
What level sensors can the LC3050 be used with?
The LC3050 accepts inputs from the LP30 low level sensor and LP31 high level sensor, and is used with high-precision self-monitoring level sensors. The minimum conductivity requirement for the input medium is 30 μS/cm, or 30 ppm at 25 °C.
What self-test, indication, and communication functions does the LC3050 have?
The controller is equipped with normal and alarm status LEDs, as well as a test button for testing the sensor, controller, and related circuits. The device automatically cyclically tests the probe, probe cable, and controller every few seconds; it can communicate with adjacent controllers via infrared, and can transmit parameters via RS485/MODBUS.
What should be noted during installation and maintenance of the LC3050?
The LC3050 can be panel, DIN rail, or baseplate mounted, and should be placed in a suitable industrial control panel or fireproof enclosure with a minimum protection rating of IP54. Before installation, ensure there is no condensation inside the product; it should not be installed outdoors without additional weather protection, and the infrared communication path should not be obstructed. The product requires no special maintenance, but the boiler level control and alarm system should still be tested and inspected as required.