DC 12V Liquid Level Sensor Relay Module | Auto Pump Controller
DC 12V Liquid Level Sensor Relay Module | Auto Pump Controller
DC 12V 2-in-1 Automatic Liquid Level Sensor & Pump Controller Relay Module
Take the guesswork out of water management with this compact DC 12V Liquid Level Sensor Switch Relay Module. Designed for both automatic water filling and automatic water pumping, this versatile 2-in-1 controller works seamlessly with motors, solenoid valves, fish tanks, irrigation systems, water towers, and livestock watering setups — all without manual intervention.
Simply set your high and low level probes, connect your pump to the NO or NC relay port, and the module handles the rest. When the water level drops below the lower threshold, the pump activates; when it reaches the upper limit, it shuts off automatically.
Key Features
- 2-in-1 Operation: Switch between auto-fill and auto-pump modes by connecting your pump to the COM/NC or COM/NO relay ports respectively.
- Wide Load Capacity: Supports up to 10A at 250VAC, 125VAC, 30VDC, 28VDC, and 12VDC — suitable for a broad range of pumps and motors.
- Low Standby Draw: Only 9mA standby current keeps energy consumption minimal.
- Compact Design: Measures just 44mm × 29mm × 19mm — fits easily in tight control enclosures.
- No Dedicated Probe Needed: Standard household wire can be used as probes, keeping setup simple and cost-effective.
- Versatile Applications: Fish tanks, aquariums, home water towers, farm irrigation, poultry/livestock watering, garden watering, and any conductive-liquid automation project.
Specifications
| Working Voltage | DC 12V (Range: DC 10–15V) |
| Standby Current | 9mA |
| Working Current | 40mA |
| Dimensions | 44mm × 29mm × 19mm |
| Maximum Load | 10A / 250VAC | 10A / 125VAC | 10A / 30VDC | 10A / 28VDC | 10A / 12VDC |
Interface Description
- HIGH – Upper limit probe terminal
- OUT – Output probe terminal
- LOW – Lower limit probe terminal
- DC+ – Positive power supply
- DC– – Negative power supply
- NC – Relay normally closed contact
- COM – Relay common contact
- NO – Relay normally open contact
How It Works
Auto-Fill Mode (COM–NC): When the water level falls below the LOW probe, the pump starts filling. When the level rises above the HIGH probe, the pump stops. Perfect for keeping water towers or tanks topped up automatically.
Auto-Pump Mode (COM–NO): Operates in the opposite manner — the pump activates when the level is high and stops when it drops low. Ideal for draining or transferring water from a reservoir.
Applications
- Home water tower automatic supply systems
- Aquarium & fish tank water change systems
- Garden & farm irrigation automation
- Poultry and livestock automatic watering
- Conductive liquid level automation (any compatible fluid)
- Solenoid valve and motor automatic control
Important Notes
- Probes (wires) are not included — standard household wire works perfectly as a probe.
- For safety, always use a well-isolated DC 12V power supply.
- Allow ±1–3cm measurement tolerance and slight color variation due to monitor differences.
For general electrical safety guidelines when working with relay modules and pump controllers, refer to OSHA Electrical Safety Standards.
Made in Mainland China.
Package Includes
- 1× DC 12V Liquid Level Sensor Switch Relay Module
Frequently Asked Questions
Q: What types of pumps or motors can this liquid level sensor relay module control?
A: This relay module can control any pump or motor within its rated load — up to 10A at 250VAC or 30VDC. This covers most standard submersible pumps, DC water pumps, solenoid valves, and small motors used in fish tanks, irrigation systems, and water towers.
Q: Do I need special probes to use this water level controller?
A: No dedicated probes are required. The module is designed so that ordinary household electrical wire can serve as probes. Simply strip the ends and position them at your desired HIGH, LOW, and OUT levels in the liquid.
Q: Can this module be used for both filling and draining a tank?
A: Yes — that's the "2-in-1" functionality. Connect your pump to the COM/NC terminals for automatic filling (pump on when level is low, off when high), or connect to the COM/NO terminals for automatic pumping/draining (pump on when level is high, off when low).
Q: Is this relay module safe to use with fish tanks or aquariums?
A: Yes, when used with a properly isolated DC 12V power supply, this module is well-suited for aquarium and fish tank water change automation. Always ensure your power supply is rated and isolated for safe operation near water.