FAA Approved Installation Manual for the EDM-960 system
Report No 909
Primary Engine Data Management System
Page 19 of 45 Rev C
Date 12-12-12
24.2 Voltage Output Type Sender System
Voltage output type systems usually have a convertor box. This is typical with the ‘Pennycap’ brand capacitive
sender system. The Pennycap convertor box measures sender capacitance and converts it to a DC voltage output
signal for the aircrafts fuel level gauge. In some cases the Pennycap convertor box alternately monitors two tanks
per wing controlled by cockpit selector switch positions. This is typical for Cessna twins having 4 selectable tanks.
The EDM can interface to this system with the addition of the dashed interface hardware (PN 790810) shown
below. NOTE: This drawing is accurate for most models of the Pennycap system; however it is the installer’s
responsibility to verify proper connections to the Pennycap output signal. Note: The original ships gauge and all