Flow Meter Gauge | Clear LCD Display | Inline Water & Fuel Tool

This diesel flow meter tracks fuel transfer rates between 10 and 120 liters per minute. The K24 digital diesel fuel flow meter installs directly onto 1-inch pipe lines. It monitors diesel, kerosene, and water transfers with clear readouts on a five-digit screen powered by two standard AAA batteries. Features and Benefits - K24 turbine flow meter mechanism - Measures liquid volume with plus-or-minus one percent accuracy across steady flow rates. - Inline fuel flow meter body with 1-inch NPT threads - Screws directly onto transfer pump nozzles without adapters. - LCD digital fuel meter display with reset button - Tracks both single batch output and lifetime running totals in liters or gallons. - Electronic diesel fuel meter with field calibration modes - Lets you adjust calibration factors on-site by holding two buttons for three seconds. Applications - Transfer pump setups: Monitors dispensed volume when mounted on fuel tanks, delivery hoses, or electric fluid transfer pumps. - Farm and fleet equipment: Measures fuel consumption when filling tractors, generators, work trucks, and diesel storage bowsers. - Water distribution: Tracks clean water flow in low-pressure washdown systems and non-potable agricultural plumbing lines. Safety & Materials Working with fuel systems requires strict safety precautions. Ensure all work areas are well ventilated and free from ignition sources when handling diesel or other fuels. Use fuel-resistant sealing tape or paste on pipe threads to prevent leaks. In fuel delivery systems, automatic shut-off nozzles rely on a venturi tube near the spout tip; when liquid covers this port, the vacuum drop trips the internal mechanical latch to stop flow. Keep electrical connections isolated from liquid paths. For general installation, verify that any upstream pipework, fittings, or adapters match the chemical properties of water or fuel to stop premature corrosion. Core Parts Needed: To build a custom monitoring rig around a digital flow meter, assemble your core delivery hardware alongside your electronics. You will need: - K24 digital LCD flow meter unit - Inline fuel-rated delivery hose and compatible threaded fittings - Mechanical shut-off or manual dispensing nozzle - Microcontroller board such as an Arduino - Internal pulse pickup sensor or external reed switch pickup - 5V or 12V regulated DC power supply - Inline fuel filter to shield internal parts from grit - Hook-up wire and an appropriate pull-up resistor Hardware Connection & Schematic Understanding how a fuel flow meter works helps when wiring an external readout. Inside the unit, fluid movement spins an internal turbine sensor. A pickup sensor registers the passing magnets and translates the revolutions into electrical pulses. To log these pulses with an external microcontroller, tap the signal line from the sensor. Connect the sensor ground directly to the controller ground. Route the signal wire to a digital interrupt pin on the board. Add a 10k ohm pull-up resistor between the signal line and the 5V rail to keep the input stable, while isolating any 12V pump circuits. Calibration & Math Knowing how to make a fuel flow meter setup accurate requires physical calibration. The meter measures fluid volume by counting turbine rotations, meaning pulse count is directly proportional to volume. The relationship is governed by a K-factor, expressed as pulses per litre. To calculate this value, dispense a known volume of diesel or water into an accurate measuring container. Divide the total raw pulses recorded by the measured volume in litres. If your test yields 1,100 pulses for 5 litres of diesel, your working factor is 220 pulses per litre. Update your calculations whenever you switch between fluids of differing viscosities. Arduino Code Example Use this baseline sketch to count pulses from the meter turbine sensor: volatile unsigned long pulseCount = 0; const byte interruptPin = 2; float calibrationFactor = 220.0; void setup() { Serial.begin(9600); pinMode(interruptPin, INPUTPULLUP); attachInterrupt(digitalPinToInterrupt(interruptPin), countPulse, FALLING); } void loop() { static unsigned long lastCheck = 0; if (millis() - lastCheck >= 1000) { detachInterrupt(digitalPinToInterrupt(interruptPin)); float litres = pulseCount / calibrationFactor; Serial.print("Litres: "); Serial.println(litres); attachInterrupt(digitalPinToInterrupt(interruptPin), countPulse, FALLING); lastCheck = millis(); } } void countPulse() { pulseCount++; }