DIGITEN G3/8 Inch Quick Connect Water Flow Sensor Switch Flowmeter Counter FL-308 User Manual

Introduction

The DIGITEN G3/8 Inch Quick Connect Water Flow Sensor Switch (Model FL-308) is designed to measure water flow rates accurately. This device features quick connect fittings for easy installation and provides a pulse signal output proportional to the water flow. It is suitable for various applications requiring precise flow monitoring.

This manual provides essential information for the safe and effective installation, operation, and maintenance of your flow sensor.

Safety Information

Ensure the power supply voltage is within the specified range (DC 3-24V) to prevent damage to the sensor.
Do not exceed the maximum water pressure of 0.8 MPa to avoid leaks or sensor failure.
Install the sensor in a location protected from extreme temperatures and humidity outside the specified operating ranges.
Always disconnect power before performing any installation, wiring, or maintenance.
Handle the sensor with care to prevent physical damage.

Package Contents

1 x DIGITEN G3/8" Water Flow Sensor (Model FL-308)

Please inspect the package contents upon receipt to ensure all items are present and undamaged. If any items are missing or damaged, contact customer support.

Specifications

Model	FL-308
Working Range	0.3 - 10 L/min
Working Voltage Range	DC 3 - 24 V
Max Current	10 mA
Output Pulse Rate	F = 21 * Q (L/Min) ±2%
Output Waveform	Square Wave
Water Pressure Range	≤ 0.8 MPa
Operating Temperature	≤ 80℃
Operating Humidity	35% - 90% RH
Storage Temperature	-25℃ - 80℃
Storage Humidity	25% - 95% RH
Material	Copper (internal components)
Cable Length	15 cm
Compliance	ROHS Compliant

Diagram showing the dimensions and features of the DIGITEN G3/8 Inch Water Flow Sensor FL-308, including watertight seal, wear-resistance, ROHS compliance, and high sensitivity. Figure 1: Product features and dimensions of the DIGITEN FL-308 Water Flow Sensor.

Setup and Installation

1. Physical Installation

Identify Flow Direction: The sensor has an arrow indicating the direction of water flow. Ensure the sensor is installed correctly in line with the water flow.
Connect Fittings: Use the G3/8 inch quick connect fittings to integrate the sensor into your water line. Ensure connections are secure and watertight to prevent leaks.
Mounting: Secure the sensor in a stable position to prevent movement or strain on the connections.

Top-down view of the DIGITEN G3/8 Inch Water Flow Sensor FL-308, showing the quick connect fittings and the label with model number and wiring information. Figure 2: Top view of the flow sensor with quick connect fittings.

Side view of the DIGITEN G3/8 Inch Water Flow Sensor FL-308, highlighting the quick connect fitting and the compact design. Figure 3: Side view of the flow sensor.

2. Electrical Wiring

The sensor comes with a 3-wire connection. Follow the wiring diagram below:

Red Wire: Connect to VCC (+) (DC 3-24V power supply).
Black Wire: Connect to GND (Ground).
Yellow Wire: Connect to Signal Output (Pulse signal).

Close-up view of the DIGITEN G3/8 Inch Water Flow Sensor FL-308, showing the wiring harness with red, black, and yellow wires connected to a white connector. The sensor label with wiring instructions is clearly visible. Figure 4: Wiring connections for the flow sensor.

Ensure all electrical connections are secure and properly insulated to prevent short circuits or electrical hazards.

Operating Instructions

The DIGITEN FL-308 water flow sensor operates based on the Hall effect principle, generating a square wave pulse signal proportional to the water flow rate.

Flow Rate Calculation

The output frequency (F) in Hz can be calculated using the following formula:

F = 21 * Q (L/Min)

Where:

F is the output pulse frequency in Hz.
Q is the water flow rate in Liters per Minute (L/Min).

The sensor provides approximately 450 output pulses per liter of water. This value can be used for total volume measurement over time.

Connect the yellow signal wire to a microcontroller or a pulse counter to read the frequency and calculate the flow rate or total volume.

Maintenance

Regular Inspection: Periodically check the sensor and its connections for any signs of wear, damage, or leaks.
Cleaning: If the sensor's performance degrades, it may be due to debris accumulation. Disconnect the sensor from the water line and power, then carefully flush it with clean water. Avoid using harsh chemicals.
Storage: If storing the sensor for an extended period, ensure it is clean, dry, and stored within the specified storage temperature and humidity ranges.

Troubleshooting

Problem	Possible Cause	Solution
No signal output	Incorrect wiring (VCC, GND, Signal). No power supply or incorrect voltage. Sensor blockage or damage.	Verify wiring connections according to the diagram. Check power supply and ensure it's within DC 3-24V. Inspect the sensor for physical damage or internal blockage.
Inaccurate flow readings	Air bubbles in the water line. Sensor installed against flow direction. Debris inside the sensor. External electromagnetic interference.	Ensure water line is free of air. Re-install sensor according to flow direction arrow. Clean the sensor as described in the Maintenance section. Relocate sensor away from strong electromagnetic fields.
Water leakage	Loose quick connect fittings. Damaged O-rings or seals. Exceeded maximum pressure.	Ensure fittings are fully seated and secure. Inspect and replace any damaged seals. Verify water pressure is below 0.8 MPa.

Warranty and Support

DIGITEN provides a one-year warranty for any quality problems with this product. For technical support, troubleshooting assistance, or warranty claims, please contact DIGITEN customer service through the retailer where the product was purchased or visit the official DIGITEN website.

Please retain your purchase receipt as proof of purchase for warranty purposes.

DIGITEN FL-308