US211M Digital Display Quantitative Flowmeter Water Liquid Flow Sensor Dosage Controller

Specifications

• Model: US211M (24V Version).

• Operating Voltage: 24V DC (±8V).

• Display: White Backlit LCD.

• Key Functions:

  • Quantitative Control: Auto-stop after set volume.

  • Flow Rate: Real-time display (Litres/min or Gallons/min).

  • Totalizer: Cumulative volume counter (up to 9999L).

• Sensor Compatibility: Standard Hall Effect Flow Sensors (5V Pulse Signal).

• Output Control: Direct drive for Solenoid Valve (same voltage as input, max ~1A).

• K-Value Adjustable: Yes (Calibrate to any sensor size).

• Dimensions: 103 x 80 x 35 mm.

Key Applications & Projects

• Bottle Filling Station: Perfect for small businesses selling milk, juice, or cleaning products. Fill bottles with exact amounts automatically.

• RO Water Dispenser: Create a coin-operated or button-operated water dispenser that gives exactly 1 Litre or 20 Litres.

• Chemical Dosing: Mix precise amounts of liquid fertiliser or chemicals into a tank.

• Kitchen Automation: Auto-fill soup kettles or coffee machines without standing and watching.

Professional Evolution

• The Bottleneck: Manually filling bottles requires weighing scales and constant attention. It’s slow and inaccurate.

• The Upgrade: With the US211M, you press one button. You can walk away while it fills. It guarantees consistency and saves hours of labor.

• Effort Level: Intermediate. Requires wiring a 24V power supply, valve, and sensor.

Virtual Technician & Setup Guide

• Power Supply: This unit requires 24V DC. Do not use 12V or 5V adapters, or the solenoid valve output may be too weak.

• Calibration (K-Value): Every flow sensor is different. You must set the "K-Value" (Pulses per Liter) in the menu.

  • Tip: Run 1 Liter of water into a measuring jug. If the screen says 0.8L, increase the K-value. If it says 1.2L, decrease it.

• Wiring:

  • Red/Black/Yellow: Connect to Flow Sensor.

  • Valve Terminal: Connect to your 24V Solenoid Valve.

  • Power Terminal: Connect to 24V DC Power Source.

• Solenoid Type: Ensure your solenoid valve matches the input voltage (24V) and is "Normally Closed" (NC).

Downloads:

• US211M Quantitative Flowmeter _User Manual

Accessories & Compatibility

• Included: 1x US211M Display Controller (24V). (Note: Sensor and Valve are NOT included).

• Required: 24V Power Supply, Flow Sensor (e.g., YF-S201, DN25), 24V Solenoid Valve.

• Recommended: NTC 50K Temperature Sensor (if temp monitoring is needed)

Frequently Asked Questions (Technical SEO)

• Does this include the sensor and valve? No, this is the Display Controller Unit only. You must buy a flow sensor and solenoid valve that matches your specific pipe size (1/2", 3/4", 1", etc.).
• Does it work with 12V? This specific SKU is the 24V version. While the display might turn on at 12V, it will NOT be able to open a 24V valve reliably. We recommend using a 24V supply.
• How accurate is it? The accuracy depends entirely on the Flow Sensor you use and your calibration. With a good turbine sensor and proper calibration, you can achieve ±1% accuracy.
• Can I use it for petrol or diesel? The controller is fine, but you must ensure your Flow Sensor and Valve are chemically rated for fuel. Most standard plastic sensors are for water only.
• Does it save the total volume when power is cut? Yes, it has internal memory to store the cumulative total volume and your K-value settings even after power loss.
• What is the "K-Value"? It is a calibration constant that tells the controller how many electrical pulses equal 1 Liter of liquid. You find this in your sensor's datasheet or by testing.
• Can it control a pump instead of a valve? Yes, provided the pump is 24V DC and draws less than ~1 Amp. For larger pumps, use the output to trigger a separate Relay Module.
• Is it waterproof? The front panel is splash-resistant, but the back terminals are exposed. It should be mounted inside a control box or kept away from direct water spray.
• Can I set it to dispense 0.5 Liters? Yes, the quantitative range starts from 0.1 Liters up to 9999 Liters.
• Does it measure temperature? Yes, but you need to connect an external NTC 50K Thermistor (not included) to the temperature port.
• Why is the screen blinking? If the dosage value blinks, it means the system is paused or waiting for start. Press "Run" to begin dispensing.
• Can I use a 5V flow sensor? Yes! The controller provides 5V on the sensor port specifically to power standard Hall Effect sensors, even though the main unit runs on 24V.
• Is there a password for settings? The default factory password for advanced settings (like K-value) is usually 1234 or 0000.
• Does it have an alarm? It can be configured to sound an internal buzzer when the dosage is complete.
• What is the max flow rate it can read? The controller can read up to 9999 LPM, but the physical limit depends on your sensor (e.g., a 1/2" sensor usually maxes out at 30 LPM).