Water Level Relay Module DC 12-24V Single Channel Controller

Single Channel Liquid Level Probe Relay Module — DC 12–24V Water Level Controller

Take full automated control of your water tank, sump, or pump system with this compact and reliable Single Channel Liquid Level Probe Relay Module. Designed to operate on DC 12–24V, this versatile controller supports both drainage mode and replenishment (refill) mode, giving you flexible options for a wide range of liquid management applications — from irrigation and aquaculture to industrial tanks and home water systems.

Key Features

• Wide Input Voltage: Compatible with DC 12V–24V power supplies for flexible installation.
• Dual Operating Modes: Easily switch between drainage mode and replenishment mode to suit your application.
• Adjustable Time Delay: Built-in adjustable delay function ensures the relay holds on or off for a customizable period after the probe detects a state change — reducing pump short-cycling and wear.
• Single Channel Design: Straightforward single-probe setup for simple, dependable liquid level sensing.
• Compact & Easy to Install: Lightweight module that mounts easily in control panels, enclosures, or DIY setups.
• Low-Voltage Safe: Operates below 50Vac / 75Vdc, meeting EU LVD low-voltage safety standards.
• No High-Concern Chemicals: Contains no restricted high-concern substances.

How It Works

Drainage Mode

The relay activates as soon as water contacts the probe. When the water level drops and the probe is no longer submerged, the adjustable delay timer begins. Once the delay period expires, the relay deactivates — ideal for draining tanks or controlling drainage pumps automatically.

Replenishment Mode

The relay activates when the probe runs dry (water level too low). Once water rises and contacts the probe again, the delay timer starts. After the delay period, the relay deactivates — perfect for automatically refilling tanks, reservoirs, or sumps.

Specifications

• Input Voltage: DC 12V – 24V
• Channels: 1 (Single Channel)
• Operating Modes: Drainage / Replenishment (selectable)
• Delay: Adjustable
• EU LVD Classification: Low voltage — below 50Vac or 75Vdc
• High-Concern Chemicals: None
• Country of Origin: Made in China

Package Includes

• 1× Single Channel Water Level Controller Relay Module

Important Notes

• Due to lighting and screen differences, the item's color may appear slightly different from product images.
• Please allow 1mm–1cm differences due to manual measurement.

Learn More About Electrical Safety

For guidance on safe installation of low-voltage electrical modules and control circuits, visit the OSHA Electrical Safety resource page.

Frequently Asked Questions

Q: What is the operating voltage range of this water level relay module?

A: This single channel liquid level probe relay module operates on DC 12V to 24V, making it compatible with a wide range of standard power supplies commonly used in pump control and automation systems.

Q: What is the difference between drainage mode and replenishment mode?

A: In drainage mode, the relay turns on when water touches the probe and turns off (after a delay) once the probe is no longer submerged — ideal for emptying tanks. In replenishment mode, the relay turns on when the probe is dry and turns off (after a delay) once water reaches the probe again — perfect for automatic refilling of tanks or reservoirs.

Q: Can I adjust the delay time on this controller?

A: Yes. This module features an adjustable delay function, allowing you to customize the hold-on or hold-off period after a probe state change. This helps prevent rapid cycling and extends the lifespan of connected pumps and equipment.

Q: What types of applications is this water level controller suitable for?

A: This relay module is well-suited for a variety of liquid level control applications including water tanks, sumps, aquariums, irrigation systems, aquaculture, industrial liquid tanks, and any DIY pump automation project requiring automatic water level management.