Multifunction Instrument Model EFI User Manual
The multifunction EFI is available in a small rectangular format and a larger round package that includes magneto test switches. Other than the magneto test switches, both formats are functionally identical. Both units simultaneously display all of the following data on a large, two-line liquid crystal display (LCD). Referring to the figures, the functions are; engine RPM, AUX, two exhaust gas temperatures (EGT), two cylinder head (CHT) or one Coolant temperature, Altitude, Climb rate and Flight Time. The unit also displays total accumulated engine time (Hobbs) at the push of a button. The LCD contrast can be adjusted from the normal seating position with the up/dn switch and provides a clearly readable display over a wide range of viewing angles. In addition, the LCD is backlighted for night viewing.
The AUX function is extremely versatile in that it can be used to display volts, fuel level, oil pressure, oil temperature, outside air temperature or any other desired parameter.
The top four functions each have a REDLINE associated with them, and the redline settings can easily be displayed and changed. REDLINE settings, Flight Time and Hobbs time are retained in permanent memory which does not need power, so no data is ever lost due to a battery failure. Exceeding a REDLINE setting causes the high intensity, red WARNING light to flash and the associated LCD value to blink. Pressing the Lmts switch stops the WARNING light, but the LCD characters still blink until the situation is corrected. The unit can be powered from either of two DC sources selected by the three position, on-off-mom(entary) Power switch. The on position is typically used to operate the instrument from 12V and the momentary position from two optional 9V alkaline batteries. If running a basic craft with only a rectifier/regulator (no 12V battery), the 9V batteries can be used to power the instrument when the engine is not running. This allows the user to observe the last flight time, total engine time or other settings without having to start the engine. The spring-loaded momentary position insures that the switch is turned off when done to conserve 9V battery life. The 9V batteries are not used for data retention and are not needed if 12V power is available from a battery.
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