The LMR/C+ Advanced Liquid Level Control Relay, developed by Borna Electronics, is a compact three-module controller designed for monitoring and controlling conductive liquid levels in tanks, reservoirs, and pumping systems. The relay provides reliable liquid level management, automatic tank filling and draining, overflow prevention, and dry-run protection for pumps.
The operating principle is based on measuring the electrical resistance between sensing electrodes. Users can adjust both the sensitivity and relay switching delay using the SENSITIVITY and DELAY controls, allowing precise adaptation to different liquids and operating conditions. Four LED indicators provide clear visual information about power status, output status, high-level condition, and low-level condition.
Features
- Automatic tank filling and draining
- Overflow prevention in tanks and reservoirs
- Pump control and dry-run protection
- Suitable for all conductive liquids
- Applicable to pressurized tanks and vessels
- Operating mode selection switch
- Corrosion-protected sensing electrode system
- Adjustable sensitivity from 1 to 20 kΩ
- Adjustable relay ON and OFF delay from 1 to 10 seconds
- Maximum isolated electrode voltage of 15 VAC
Technical Specifications
| Parameter | Specification |
| Supply Voltage | 220 VAC ±15% |
| Network Frequency | 50 Hz ±5% |
| Internal Power Consumption | 3 W |
| Maximum Electrode Cable Length | 300 m |
| Protection Degree | IP20 according to IEC 60529 |
| Operating Temperature | -20°C to +60°C |
| Relative Humidity | 15% to 85% |
| Mounting Method | DIN Rail and Flush Mounted according to IEC 60715 |
| Insulation Class | Class II |
| Output Relay | One C/O (SPDT) contact, 6 A |
Status Indicators
- PWR – Input Power Supply Status
- OUT – Output Relay Status
- HI – High-Level Condition
- LO – Low-Level Condition
Applications
- Water pumping systems
- Industrial reservoirs and tanks
- Pressurized vessels
- Automatic filling and draining systems
- Liquid level monitoring applications
- Pump protection systems
The LMR/C+ Advanced Liquid Level Control Relay combines flexible configuration, adjustable sensitivity, and intelligent level control functions to provide dependable liquid management and pump protection in industrial and commercial installations.