Swiss DIGMESA imported micro flowmeter for unmanned aerial vehicles

DIGMESAFocused on small liquid flow measurement, SwitzerlandDIGMESAFlow meters are distributed worldwide. Product Score9A series, subdivided into nearly a hundred models. Used in fields such as chemical engineering, electronics, and food. Dandong Deze Technology Co., Ltd. is located in SwitzerlandDIGMESAThe general agent in Chinese Mainland. We are dedicated to handling business in mainland China In SwitzerlandDIGMESAwebsiteYou can see Chinese partners introduced in Chinese on the link!

1Swiss DIGMESA imported micro flowmeter for unmanned aerial vehiclesThe core characteristics (key to adapting to drones)

DigmesaSpecializing in micro, low flow, and high-precision liquid measurement, itFHKThe93NThe series parameters are highly compatible with the load and operating conditions requirements of the drone

Volume and weight: Miniature design (diameter) 1.0–5.6mm）The whole machine is lightweight and has minimal impact on the load capacity of the drone.

Traffic range: coverage0.04–10 L/min（FHKSeries), suitable for low flow scenarios such as unmanned aerial vehicle fuel and plant protection medicine.

Accuracy and stability: Measurement accuracy ＜ ±2%Repeatability ＜ ±0.25%Meet the energy needs of unmanned aerial vehicles/Accurate monitoring of homework flow.

Power supply and output:4.5–24VDCWide 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.

1Swiss DIGMESA imported micro flowmeter for unmanned aerial vehiclesFlow range and accuracy requirements

The flow range must match the engine fuel consumption

Small drone engine:0.5～5 L/mincommon

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

Requirement: Range covering maximum fuel consumption 1.2 Multiple times or more, avoid working at full range.

Accuracy and repeatability

Fuel metering: accuracy ±1%～±2%enough

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

Low flow cannot have dead zone: idle speed/It should also be able to measure when the throttle is low.

2、 Volume, weight, and installation

Ultra light and extremely small

Weight is usually required<30gIt's better<15g

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 material: Fluororubber（FKM）TheEPDMOil 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

support5V / 12VCommon voltage for drones

Low power consumption,<20mAbest.

output signal

Priority: Pulse signal (Hall)/Gear)

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

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

anti-interference

Strong interference from engine ignition system

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 bear 10～20gContinuous vibration

Internal rotor/The 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 least1MPaThe above.

Anti bubble ability

Bubbles in the oil circuit are very common

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

Lobular wheel/Elliptical gear/Micro turbine structures are more suitable for fuel.

7、 Working temperature

Operating 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/Priority given to bearingless structures (long lifespan)

continuous work ≥1000 hour

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

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

Small size, ultra lightweight

Flow matching engine fuel consumption

Pulse output,5/12Vpower supply

Oil resistant, earthquake resistant, and anti-interference

All directional installation, anti bubble

Sufficient accuracy and high repeatability