The LMR Liquid Level Control Relay, developed by Borna Electronics, is designed for automatic monitoring and control of conductive liquid levels in tanks, reservoirs, and pumping systems. The relay can be used for liquid level control, automatic tank filling and emptying, overflow prevention, and dry-run protection of pumps.
The operating principle is based on measuring the electrical resistance between sensing electrodes. Users can adjust the detection sensitivity using the SENSITIVITY control over a range of 1 to 10 kΩ, allowing the relay to be adapted to different conductive liquids and operating conditions.
Features
- Pump control and automation
- Dry-run protection for pumps
- Overflow prevention in tanks and reservoirs
- Automatic tank filling and emptying
- Detection of liquid conductivity
- Suitable for all conductive liquids
- Applicable to pressurized tanks and vessels
- Adjustable sensitivity from 1 to 10 kΩ
- Corrosion-protected sensing circuit
- Isolated electrode output voltage of maximum 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 |
| Maximum Electrode Voltage | 15 VAC, isolated |
| Maximum Electrode Current | 1.5 mA |
| Protection Degree | IP20 according to IEC 60529 |
| Operating Temperature | -20°C to +60°C |
| Relative Humidity | 15% to 85% |
| Mounting Method | DIN Rail according to IEC 60715 |
| Output Relay | One C/O (SPDT) contact, 6 A |
Applications
- Water pumping systems
- Water storage tanks
- Industrial reservoirs
- Pressurized tanks and vessels
- Automatic filling and draining systems
- Liquid level monitoring and control applications
The LMR Liquid Level Control Relay provides reliable and cost-effective liquid level monitoring and pump protection, helping prevent dry-running, overflow conditions, and operational interruptions in industrial and commercial installations.