DIGMESA micro flowmeter for fuel control of unmanned aerial vehicles

Swiss imported micro liquid flow meter DigMesa flow sensor is distributed in various countries. Numerous clients control and measure liquids in multiple fields: food and beverage industry, industrial chemistry, medical and laboratory technology, as well as semiconductor industry and high-tech industry. DigMesa can provide ideal solutions for any type of medium within the measurement range of small batches and small batches.

DIGMESA micro flowmeter has nearly a hundred sub models, covering a flow range of 0.027-30L/min, with an accuracy of ± 2%, repeatability of ± 0.25%, a pressure of 10 bar at 20 ℃, a temperature of -10-100 ℃, and pulse signal output (if displayed, not available). Each model has a flow curve and pressure loss curve. Both viscous liquids and highly corrosive liquids have specific models that can be tested.

1、 Core features of DigMesa flowmeter (adaptation)DIGMESA micro flowmeter for fuel control of unmanned aerial vehiclesKey)

DigMesa is known for its micro, low flow, and high-precision liquid measurement capabilities. Its FHK, 93N, and other series of parameters are highly compatible with the load and operating conditions requirements of unmanned aerial vehicles

Volume and weight: With a miniaturized design (diameter 1.0-5.6mm), the entire machine is lightweight and has minimal impact on the load capacity of the drone.

Flow range: covering 0.04-10 L/min (FHK series), suitable for small flow scenarios such as drone fuel and plant protection medicine.

Accuracy and stability: Measurement accuracy<± 2%, repeatability<± 0.25%, meeting the precise monitoring of drone energy/operational flow.

Power supply and output: 4.5-24VDC wide voltage, pulse signal output, easy to connect to drone flight control/electronic control system.

Medium adaptation: capable of measuring water, fuel, pesticides, chemical reagents, etc., covering the mainstream liquid medium of drones.

1、 Flow range and accuracy requirements

The flow range must match the engine fuel consumption

Small drone engine: 0.5~5 L/min common

Medium sized oil powered unmanned aerial vehicle: 2-15 L/min

Requirement: The range should cover at least 1.2 times the fuel consumption and avoid working at full range.

Accuracy and repeatability

Fuel metering: Accuracy of ± 1% to ± 2% is sufficient

The key is repeatability: it must be ≤± 0.2%, otherwise the flight control cannot accurately calculate the remaining fuel level.

Low flow rate should not have dead zone: it should also be measurable at idle/low throttle.

2、 Volume, weight, and installation

Ultra light and extremely small

The weight is usually required to be less than 30g

The appearance is slender and flat, making it easy to fit into the body's pipelines.

No requirements for installation direction

The attitude of the drone changes greatly, and the flow meter cannot only be used horizontally.

Prioritize selecting types that are not affected by installation in all directions.

3、 Medium and oil resistance performance

Must be compatible with: gasoline, methanol oil, diesel, aviation kerosene, etc

Sealing materials: FKM, EPDM, oil resistant and aging resistant

Ordinary silicone and nitrile cannot be used as they are prone to swelling and failure.

4、 Electrical and Signal Adaptation Flight Control

power supply

Supports 5V/12V common voltage for drones

Low power consumption,<20mA.

output signal

Priority: Pulse signal (Hall/gear)

The flight control directly reads the pulse count to calculate the flow rate, which is reliable.

We do not recommend analog signals as they are prone to interference and require complicated wiring.

anti-interference

Engine ignition system interferencestrong

The flowmeter needs to be resistant to electromagnetic interference, and the wire strip shielding is better.

5、 Seismic and vibration resistance (of utmost importance)

The drone engine vibrates greatly, which is the main reason why ordinary flow meters quickly break down.

requirements

Can withstand continuous vibration of 10-20g

The internal rotor/bearing is not loose or stuck

Sturdy structure with no easily breakable plastic parts

6、 Pressure resistance and anti bubble, anti air lock

pressure resistance

The fuel pump circuit is generally 0.5-1MPa

The pressure resistance of the flowmeter should be at least 1MPa.

Anti bubble ability

Bubbles in the oil circuit are very common

The flowmeter should not stop running, leak, or overcharge due to bubbles

Small leaf wheel/elliptical gear/micro turbine structure is more suitable for fuel.

7、 Working temperature

Working temperature: -30 ℃~+85 ℃

We need to withstand high altitude and low temperature, as well as high temperature in the engine compartment.

8、 Reliability and lifespan

Brushless/Bearingless Structure Priority (Long Lifespan)

Continuous work ≥ 1000 hours

Not easily stuck by impurities (preferably with a small filter)

Summary (Simplified Version)

The fuel flow meter used for drones must meet the following requirements:

Small size, ultra lightweight

Flow matching engine fuel consumption

Pulse output, 5/12V power supply

Oil resistant, earthquake resistant, and anti-interference

All directional installation, anti bubble

Sufficient accuracy and high repeatability

DIGMESA micro flowmeter for fuel control of unmanned aerial vehicles