Name: XH-M203 / HCW-M203 Automatic Water Level Controller Board - UNIVERSAL CIRCUIT SYSTEM
SKU: UCS-0361
Price: 550.00 BDT
Availability: InStock

This HCW-M203 / XH-M203 Automatic Water Level Controller Board is an advanced, high-reliability electronic switching module engineered to fully automate fluid level management in holding tanks, reservoirs, and drainage wells. Utilizing a robust voltage-sensing comparator circuit and a heavy-duty electromechanical relay, this intelligent module monitors high and low fluid levels to control AC/DC water pumps autonomously, removing the risk of water tank overflows or pump burnout from dry running.

Designed for seamless drop-in integration, this board eliminates the need for expensive, overly complex programmable microcontrollers. It acts as an automatic gatekeeper for household overhead tanks, sump pumps, industrial storage systems, agricultural irrigation setups, and automated aquarium water top-offs. The package includes two pre-terminated 2-pin connector wire harnesses to simplify sensor deployment right out of the box.

Technical Specifications

Product Model: HCW-M203 / XH-M203 (Bestep Core Design Architecture)
Operating Input Voltage: 12V DC (Requires clean external DC power supply)
Output Control Capacity: Max 10A @ 250V AC / 10A @ 30V DC
Control Mechanism: High/Low Threshold Sensing Mechanical Switch
Output Circuit Interface: Isolated SPDT (Single Pole Double Throw) Relay Terminals
Status Indicators: Onboard Power LED and active Charging/Relay Status LEDs
Sensor Connectors: 2 x Onboard 2-Pin male plug headers
Board Dimensions: Approximately 60mm x 40mm x 18mm

Key Product Features

Intelligent Pump Automation Loop: Automatically monitors and maintains proper liquid boundaries. When fluid levels fall below your lower threshold sensor probe, the internal logic triggers the relay to snap shut and activate your pump. Once the fluid rises to contact the upper threshold probe, the relay instantly cuts power to prevent overflows.
Heavy-Duty Power Isolation Relay: Equipped with a premium Songle SRD-12VDC-SL-A 10A relay, this module provides full galvanic isolation between the low-voltage DC sensing circuit and the high-voltage AC mains line powering your electric water pump, ensuring safe, long-term operation.
Dual Multi-Status LED Indicators: Designed with onboard surface-mount diagnostic LEDs that provide immediate visual feedback. Technicians and operators can quickly verify system power health and see whether the board is currently outputting power to the pump line without needing a multimeter.
Universal Sensor Compatibility: The highly sensitive input circuitry is fully compatible with a wide array of physical inputs. It operates flawlessly using simple mechanical float switches, magnetic liquid switches, conductive stainless steel probes, or basic bare copper wire endpoints positioned at different heights inside your tank.
Pre-Wired Connection Harnesses: Ships complete with two flexible 2-wire cables pre-fitted with matching 2-pin white female terminal plugs. This plug-and-play harness design eliminates tedious strip-and-crimp work, allowing you to connect your tank’s sensor lines directly to the board in seconds.

Terminal & Header Layout Guide

Blue Screw Terminal Block (Input): Connects to your regulated 12V DC power source to energize the board’s internal chip logic and relay coil.
Blue Screw Terminal Block (Output): Three-port isolated terminal block providing Common (COM), Normally Open (NO), and Normally Closed (NC) contacts to sit inline with your water pump’s main power supply line.
White 2-Pin Terminal Plugs: Dedicated connection interfaces for your High-Level sensor (Upper Limit) and Low-Level sensor (Lower Limit).

Basic Sensor Calibration & Wiring Advice

To add immense value to your product page and significantly lower your customer return rates, include these deployment tips for your buyers:

Float Switch Integration: If you are using standard non-powered mechanical liquid float switches, wire one switch to the upper header plug and one to the lower header plug. Ensure the switches are mounted upside down or right-side up depending on whether you want a tank-fill or tank-drain configuration.
DIY Conductive Probes: For a zero-cost sensor setup, you can use standard insulated copper wires as probes. Secure one reference wire to the bottom of the tank, a low-level wire at the desired “pump-on” depth, and a high-level wire at the desired “pump-off” depth. The module senses the tiny electrical current moving through the water to trigger the relay.