SV-EMS-220 Engine Monitoring System Installation and Configuration
SkyView HDX System Installation Manual - Revision E 10-19
engines which use the Marvel Schebler MA-3 carburetors, this plug is located on the
forward side. On six (6)-cylinder engines using the MA-4 carburetor, the plug is located
on the rear. If your carburetor is not drilled and tapped for the plug, you must remove the
carburetor from the engine and drill out the lead plug in the appropriate spot. Tap the hole
with a ¼-28 tap. Remove all chips and burrs before reinstalling.
Route either of the two (2) wires to an electrical ground on the SV-EMS-22X D37
connector. Route the other wire to the general purpose input of your choice.
10.2.18 Trim and Flaps Position Potentiometers
Trim and flap indicators may not be available on all airplanes. Only airplanes equipped
with flap and trim position sesnors can display these positions on EMS
Position potentiometers may be connected to any general purpose input pin on the SV-
EMS-220’s D37 and must be calibrated according to the instructions found in Section
10.9: EMS Sensor Calibration. The number of position potentiometers in any installation
is limited by the number of unused general purpose input pins on the SV-EMS-220’s D37
connector. The tables in the Example Engine Sensor and Transducer Installations
Section contain recommended input pins for position potentiometers.
Dynon Avionics does not sell trim or flaps position sensors. These are normally included
with, or added onto, their respective servos.
Most flap and trim sensors are potentiometers (variable resistors) which require power
and ground inputs, and supply an output that is a function of position. These
potentiometers come in a variety of resistance ranges, but are typically 1 kΩ, 5 kΩ, 10
kΩ, and 20 kΩ. All of these values will work properly with the SV-EMS-22, as there is a
calibration required. Connect Pin 18 (+5 Volts Auxiliary) from the SV-EMS-220 to the +5
Volts input on your trim/flap position sensor. Connect the ground input on the sensor to a
ground common to the SV-EMS-220’s signal ground. Connect the output of the sensor to
the desired general purpose input. For physical installation, refer to the instructions that
came with your position sensor.
10.2.19 General Purpose Temperature Sensor
Any temperature sensor provided by Dynon Avionics may be utilized as a general
purpose temperature sensor on any of Pins 4, 6, 7, 8, 9, 10, 11, 12, 20, 21, 22, 23, or 31
on the SV-EMS-220.
For example, you may connect an SV-OAT-340 sensor and configure it as a general
purpose thermometer (e.g., for cabin temperature). Connect one (1) of the wires to the
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