FUEL FLOW SENSOR INSTALLATION GUIDE
Contents
1. d Table of content 1 See AU gt O E EET A E EE E A E 1 2 Installation 2 2 1 DV GIVI W soirs gmc bioeae geidcinte estnadd av aeainist raceddneomedeiceedaecdoecses 2 FUEL FLOW SENSOR INSTALLATION 2 2 Fuel compatibility cecsccssssseessssssssseesesesssseessesesssteeeseeeessneeeseee 2 2 3 Ranging CU seta cate ice shcasteet geese ch ne cea ee nate gen ani deccamarn vcnsaendexaneue ciactedoocies 3 G U IDE 2 4 POW URC C UO A A AE E N A 4 2 5 LOC ANC eee E e 4 T 2 6 PUD E E A eae EA E E E A E aches E A 4 Revision 1 2 7 E ET 4 28 ONemaION cesis eree eera Ereren rE 5 2 9 MOUNINO suns sttecrraisanacvasaahtenndt aitnasesestuunnesdieaniacubtenttaansinediesevimennaadasils 6 2 10 Magnet Magnetic fields ccccccessecececeeeeceeeceeseeeesseeseeeeseeas 6 2 11 Connecting the sensor to the Sender Unit ccsseeeeeeeeeeeeeeees 7 AMORA ON eoar E cm stpss niece E E 7 A WO FIA a E E E E A AE A E E E A E 8 Revision history Revision Changes Cs Date Sept 2011 a Acronyms FF Fuel Flow GPM Gallon 1 US liquid Gallon 3 785 liters Per Minute Liter Per Minute 1 Features Using a fuel flow sensor enables EFMS100 system to provide the following information Fuel flow Fuel used Fuel onboard Time to tank empty Distance to tank empty after entering your speed At the heart of the sensor is a precision turbine that rotates freely on robust sapphire bearings Chemically resistant ceramic ma2. e arrow on the sensor matches the direction of the flow 2 5 Location The best location for the sensor is a low as possible near the fuel tank Placing the sensor as low as possible will avoid cavitation of the fuel Cavitation is the formation of vapor bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapor pressure Cavitation should be avoided as it will cause inaccurate flow measurements Since the pressure in the fuel line decreases with the height it is important to place the flow sensor as low as possible We recommend placing the sensor below the top of the fuel tank Placing the sensor near the tank therefore far from the engine will minimize the pressure flow pulses caused by the carburetor fuel pump Pressure pulses must be minimized as they will cause inaccurate flow measurements 2 6 Fuel filter A fuel filter must be inserted between the tank and the sensor to prevent dirt or debris to reach the sensor These will not block the fuel flow but may lead to the turbine wheel inside the sensor jamming 2 7 Reservoir A small reservoir must be provided between the flow sensor and the carburetor fuel pump The reservoir can be a primer bulb or a long fuel line The reservoir will minimize the pressure flow ripple pulse caused by the carburetor fuel pump and will provide optimal performance of the sensor 2 8 Orientation 2 8 3 Summary 2 8 1 Vertical axe ENGINE Fo
3. gnets that are detected through the chamber wall by a Hall Effect detector magnetic field detector Fuel from tank 2 Installation The fuel flow sensor is a precision instrument which requires careful installation to provide accurate information 2 1 Overview To measure the fuel flow the sensor should be inserted in the fuel line between the fuel tank and the carburetor of the engine Fuel to engine 8mm hose C 12mm hose 1 8 meters 6 feet cable Wires to sender D unit 2 2 Fuel compatibility lt is your responsibility to ensure that the fuel you intend to use is compatible with the fuel flow sensor After several years of continuous test we have found that EFMS fuel flow sensor is very compatible with automotive fuels many of which contain methanol 2 3 Ranging jet The sensor is delivered with 4 raging jets Depending on the fuel flow range of your engine a jet must be inserted in the sensor Flow Range Flow Range pei Liter Per Minute US Gallon Per Minute hole imm 0 05 0 5 0 013 0 13 Please ensure that the correct jet size is selected before installation as once inserted the removal of the jet may damage the sensor Insert the jet in the input side of the sensor Use the flat end of a drill bit of suitable diameter to push the jet all the way to the stop This requires a bit of force 2 4 Flow direction The sensor must be inserted in the fuel line so that the larg
4. r optimal performance in particular at low flow rates the axe of the CARBURETOR PUMP turbine must be almost vertical TURBINE AXE FILTER RESERVOIR SENSOR 2 8 2 Bubbles Please ensure that no bubbles can be trapped inside the sensor Bubbles will cause inaccurate flow measurements The best way to avoid bubbles inside the sensor is to allow bubbles to escape 2 9 Mounting This is done by pointing the outlet slightly upwards and the inlet The flow sensor is a precision instrument which must be isolated from slightly downwards vibrations ese Ete 2 10 Magnet Magnetic fields The sensor contains 3 magnets which are part of the turbine wheel assembly The magnetic field generated by these magnets is used to measure the flow rate lt is important to mount the sensor far from strong magnetic fields For the same reason the fuel line on the OUT side towards the engine should go up immediately after the exit of flow sensor 5 6 2 11 Connecting the sensor to the sender unit The 3 wires at end of the cable must be connected to EFMS sender unit Wire Function Terminal on sender unit Shield GROUND Power provided by the VPWR OUT sender unit to the fuel flow sensor Signal from fuel flow FLOW IN sensor to sender unit 3 Calibration Refer to EFMS100 user manual for the description of the calibration procedure The calibration procedure should provide a PULSE VOLUME RATIO within 5 compa
5. red to the values provided in the table below If the value you calculate with the calibration procedure is far from the value provided by the table below it means that the flow sensor is not installed properly 4 Important Note to Pilots Always have a visual indication of the fuel level available either by means of a sight glass direct tank observation or a Known reliable secondary fuel level gauge Fuel level indication by means of calculated fuel burn is subject to errors both by entering incorrect starting fuel levels as well as mechanical problems causing the flow sensor impeller to turn too slowly resulting in under reading fuel burn and thus over reading remaining fuel As pilot in command of an aircraft it is your responsibility to ensure that you have sufficient fuel to reach your intended destination Always ensure that you have a generous amount of reserve fuel and never use your reserve fuel except in an emergency if it is unavoidable NOMINAL i e APPROXIMATIVE values of PULSE VOLUME RATIO Do not use these values but instead use the calibration procedure to calculate the correct value Je Pulses per Liter Pulses per US Gallon Diameter Pulse per Liter x 3 785 hole 17000 64345 7000s 7000 7 8
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