VAL Avionics NAV 2000 Guia de Instalação descarregar pdf (Página 157)

SV-EMS-220/221 Installation and Configuration

SkyView System Installation Guide - Revision R 7-49

Once a capacitive fuel level sensing system is calibrated for a certain type fuel, only

that 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. If

calibrated for 100LL, then by using Auto 10% Ethanol in the tanks the indications

could off by 50%.

It is important to understand that fuel level measurements are subject to the

physical limitations of the sensor. Depending on your fuel tank and sensor

geometry, there may be some immeasurable fuel at one or both ends of the fuel

level sensors’ range. SkyView’s fuel calibration process is designed with this in

mind, and always takes the conservative approach to ensure that it does not report

erroneous fuel readings that might indicate that there is more fuel on board than

there 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 case

you may also see no apparent change in fuel level readings when the sensor is

maxed out on the full side. Similarly, on the empty side, you may see a zero

quantity indication before the tank is truly empty if the sensor has reached the

bottom of its travel or measuring capability when the tank still in fact has fuel in it.

Resistive fuel level sensor

You may connect as many resistive fuel level sensors to the SV-EMS-220/221 as open general

purpose inputs will allow. We recommend that pins 20 and 21 of the SV-EMS-220/221 D37 are

used before other general purpose inputs.

Capacitive fuel level sensor

Capacitive 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 volts

DC.

First, supply the sensor with power according to the manufacturer’s instructions. If the sensor

manufacturer requires a sensor calibration, perform that calibration first. Be sure to configure

the firmware to recognize the capacitive fuel level sensor on the enhanced general purpose

inputs.

If you are installing Dynon’s Capacitance-to-Voltage Converter (most commonly used with the

capacitive plates in some RVs), please read the

1 2 ... 152 153 154 155 156 157 158 159 160 161 162 ... 400 401

Sem comentários

VAL Avionics NAV 2000 Guia de Instalação Página 157