LSU4.9 Mini Portable Air-Fuel Ratio Analyzer with Oxygen Sensor for Drone Engine Carburetor Adjustment

Introduction:
- Newly upgraded, adding a fully CNC aluminum alloy shell on the basis of the original, more beautiful. The new model supports simultaneous display of air-fuel ratio AFR value and LAMBDA value to meet different customer needs.

- Not only does this tool support rapid adjustment of drone carburetor engines, but it is also very useful for motorcycle users. Whether it is changing electronic fuel injection, programming ECU, or adjusting carburetors, it is very helpful and can quantitatively display this process through specific numerical values.

- In actual use, the interface of the oxygen sensor needs to be welded at the exhaust manifold, and the sensor can only be accurately measured when installed in the exhaust manifold. Especially for motorcycles and small displacement engines, measuring instruments at the exhaust outlet may not respond.

- This tool uses LSU4.9 to measure the oxygen concentration in the exhaust gas, displaying the air-fuel ratio of the engine in real time, providing a visual reference for the debugging of the engine carburetor. Based on the value, the appropriate fuel needle range can be adjusted without relying on speculation.

- The main difference between LSU4.9 and LSU4.2 is that the measurement of LSU4.9 is based on the reference pump current, while the measurement of LSU4.2 is based on the air in the natural environment.

- The principle of measuring air-fuel ratio in LSU4.2 is to control the oxygen balance between the pump oxygen chamber and the reference air chamber. The pump current reflects the true air-fuel ratio. However, in practical work, the reference air is easily contaminated by engine exhaust or other pollution sources. Once the reference air is contaminated, the characteristic curve of the sensor will deviate, which will affect the measurement accuracy.

- The LSU4.9 oxygen sensor is completely detached from the reference air. By comparing the actual pump current with a calibrated reference pump current, the pump current reflects the true air-fuel ratio. Therefore, the sensor's characteristic curve is not affected by external environmental interference.

- Thanks to the LSU4.9 wide range oxygen sensor, this air-fuel ratio analyzer can be automatically calibrated after power on, without the tedious calibration steps of old-fashioned sensors. Conventional model aircraft two-stroke gasoline engines, even experienced technicians cannot accurately judge the differences caused by small fuel needle adjustments. But for drones that work continuously for 3 or 4 hours or more, this difference may lead to significant fuel consumption differences. Therefore, through this air-fuel ratio analyzer, the current combustion status of the engine can be displayed in real time, and this small difference can be amplified and quantified. Just adjust the fuel needle to maintain lambda at around 0.95, which can maintain a relatively ideal working state, ensuring both lifespan and low fuel consumption. Of course, due to the inherent physical characteristics of carburetors, it is not possible to maintain the entire operating range of the engine at around 0.95. Namely, if you adjust it to 0.95 at full throttle, the lambda may only reach 0.8 at medium speed (rich fuel). When you adjust the medium speed to 0.95, the full throttle may reach 1.2 or above (lean fuel), so you need to make a trade-off and try to adjust the long-term operating range of the engine to a suitable state. This is also one reason why carburetors cannot compare to electronic fuel injection systems. When using, replace the exhaust pipe with an oxygen sensor and only adjust the H fuel needle at high speed to make the lambda value on the screen around 0.95. At idle, adjust the lambda value to around 0.8, and no longer worry about the engine being difficult to adjust.

- You can use 3S lithium batteries or 12V batteries (not included) for power supply. Do not plug or unplug the sensor when it is powered on. The sensor should not be dropped violently or exposed to water when heated, otherwise the internal ceramic structure is prone to breakage.

Package Included:
- 1 x Analyzer
- 1 x Sensor

Note:
- The battery is not included.