Diesel Flow Meter | 1-Inch Mechanical Counter | High Accuracy 1% Gauge

Keep track of fluid transfers with this inline diesel flow meter. It installs directly into standard 1-inch NPT pipe setups to measure diesel, kerosene, and gasoline. The internal turbine provides 1% accuracy, while the four-digit LCD screen gives you clear batch numbers and total lifetime volume. Features and Benefits - 1-inch standard NPT threaded connections - Screws right into your existing transfer pump hoses without needing special adapters. - Internal precision turbine sensor - Reads fluid movement accurately across varying flow rates with roughly 1% margin of error. - Four-digit backlit digital counter - Displays immediate batch volume clearly and tracks lifetime pumped gallons on a totalizer. - Anodized aluminum inner housing - Handles petroleum solvents, diesel, and gasoline without corroding or gumming up over time. Applications - Tracking diesel fuel delivery when filling tractors, combines, and support trucks from farm bulk tanks. - Monitoring equipment fuel consumption from mobile slip tanks mounted on the back of utility pickup trucks. - Checking gasoline and light oil throughput during liquid transfers across commercial workshops and fleet yards. Safety & Materials Working with fuel systems requires strict fire safety precautions. Ensure all pipe threads are clean and sealed using fuel-resistant thread paste or PTFE tape rated for hydrocarbons. Ground the metal pipework to discharge static electricity before pumping diesel, fuel, or oil. Avoid overtightening the 1-inch female ports to prevent cracking the housing. If you pair this unit with an automatic shut-off nozzle, ensure your lines can handle sudden pressure spikes when the internal venturi port shuts the poppet valve. Check all joins for weeping before putting the line under constant pressure. Core Parts Needed: To build an electronic monitoring rig alongside your mechanical meter, you will need several workshop components: - A 1-inch in-line flow meter body - Electronic pickup sensor or turbine sensor - Arduino Uno or similar microcontroller - 10k ohm pull-up resistor - 5V or 12V regulated power supply - Shielded three-core signal cable - Fuel-rated 1-inch BSP or NPT pipe nipples - Stainless steel hose clamps and fuel delivery hose Ensure all electronic enclosures are sealed against vapour ingress. Standard PVC wire degrades in diesel, so route wiring through protective conduit away from discharge points. Hardware Connection & Schematic To log pulses from a sensor, connect the device to your microcontroller using a digital interrupt pin. Feed the sensor with a stable 5V or 12V supply depending on its rating. Connect the sensor ground directly to the Arduino ground terminal. Place a 10k ohm resistor between the 5V supply and the sensor signal line to pull the digital input high. Attach the signal wire to Arduino digital pin 2. Keep the signal run short to avoid interference from nearby pump motors. The mechanical counter continues operating independently on the fluid line regardless of whether the external wiring is connected. Calibration & Math Understanding how fuel flow meter works relies on measuring fluid displacement or internal gear revolutions. To calibrate an electronic sensor alongside this mechanical meter, pump an exact volume into an approved measuring container. Count the pulses generated during the run. The calibration factor, or K-factor, equals the total pulses divided by the volume dispensed. If the setup yields 450 pulses over 10 litres, the K-factor is 45 pulses per litre. Use the mechanical counter, which delivers measurement accuracy within 1%, as your baseline visual reference to verify your mathematical calculations and adjust for variations in fluid viscosity. Arduino Code Example Use this interrupt-driven sketch to capture pulses from your fuel sensor: volatile unsigned long pulses = 0; const float kFactor = 45.0; void countPulse() { pulses++; } void setup() { Serial.begin(9600); pinMode(2, INPUTPULLUP); attachInterrupt(digitalPinToInterrupt(2), countPulse, FALLING); } void loop() { static unsigned long lastPrint = 0; if (millis() - lastPrint >= 1000) { lastPrint = millis(); noInterrupts(); unsigned long currentPulses = pulses; interrupts(); float litres = currentPulses / kFactor; Serial.print("Litres: "); Serial.println(litres, 2); } }