SkyView System Installation Guide - Dynon Avionics

SV-EMS-220/221 Installation and Configurationvoltage on its own, you may be able to use Dynon’s Capacitance-to-Voltage Converter. Read therelevant section below for the type that you are installing.After installation, fuel level sensors must be calibrated. Your SkyView displayutilizes onscreen wizards that help you do this. Go to the EMS Calibration Menu toaccess these wizards (SETUP MENU > HARDWARE CALIBRATION > EMSCALIBRATION).Once a capacitive fuel level sensing system is calibrated for a certain type fuel, onlythat fuel should be used and the aircraft should be placarded for such. For example,ethanol has a dielectric constant much different than 100LL or Auto Fuel. Ifcalibrated for 100LL, then by using Auto 10% Ethanol in the tanks the indicationscould off by 50%.It is important to understand that fuel level measurements are subject to thephysical limitations of the sensor. Depending on your fuel tank and sensorgeometry, there may be some immeasurable fuel at one or both ends of the fuellevel sensors’ range. SkyView’s fuel calibration process is designed with this inmind, and always takes the conservative approach to ensure that it does not reporterroneous fuel readings that might indicate that there is more fuel on board thanthere actually is. The end result is that you may experience fuel readings at “full”that are numerically less than the physical capacity of the tanks, and in this caseyou may also see no apparent change in fuel level readings when the sensor ismaxed out on the full side. Similarly, on the empty side, you may see a zeroquantity indication before the tank is truly empty if the sensor has reached thebottom of its travel or measuring capability when the tank still in fact has fuel in it.Resistive fuel level sensorYou may connect as many resistive fuel level sensors to the SV-EMS-220/221 as open generalpurpose inputs will allow. We recommend that pins 20 and 21 of the SV-EMS-220/221 D37 areused before other general purpose inputs.Capacitive fuel level sensorCapacitive fuel level sensors are only supported on pins 8, 22, 23, and 31 on the SV-EMS-220/221 D37. Capacitive sensors must output a variable voltage within the ranges of 0-5 voltsDC.First, supply the sensor with power according to the manufacturer’s instructions. If the sensormanufacturer requires a sensor calibration, perform that calibration first. Be sure to configurethe firmware to recognize the capacitive fuel level sensor on the enhanced general purposeinputs.If you are installing Dynon’s Capacitance-to-Voltage Converter (most commonly used with thecapacitive plates in some RVs), please read the Capacitance-to-Voltage Converter installationinstructions.SkyView System Installation Guide - Revision O 7-43