J.P. Instruments EDM 740 Pilots Guide - Manual (Page 55)

For Your Safe Flight Page 55
MAP, Fuel Flow Alarm Limits, Units, Fuel Capacity
MAP Overboost Alarm
Enter the redline for overboost on turbocharged engines.
Fuel Flow Units (shaded area above)
Selects the units in all measurements where fuel quantity or fuel rate is
displayed. If you change this parameter, it does not change the
numerical value of the fuel tank capacity. You must do this
manually. For example if you change from Gal. to Lbs., the tank
capacity will be interpreted as 50 Lbs. rather than 50 gallons; the EDM
will not automatically convert 50 Gal to equivalent pounds.
Main Tank Capacity
Enter the total usable fuel capacity of the main tanks in the fuel flow
units selected.
If you do not have auxiliary tanks or tank tabs, answer “No.” If you
answer “Yes,” you will be asked to input the capacity of the auxiliary
tanks in the fuel flow units selected. Another scenario is if you have tank
tabs and sometimes fill only to the tabs. In this case you may set the
auxiliary tank capacity to the difference between full tank capacity and
tab capacity. Note: The EDM does not differentiate fuel flow between
the main and auxiliary tanks; it tracks only total usable fuel in the
aircraft.
Low Time Alarm Limit
Select the value of the time remaining, in minutes, that triggers the
alarm. Time remaining is determined by dividing the current calculated
fuel remaining by the current fuel flow rate.
Low Fuel Alarm Limit
Select the value of the fuel remaining, in the selected fuel flow units,
that triggers the alarm. Fuel remaining is a calculated value and is
dependent on what you’ve programmed into the EDM when refueling
and the performance of the fuel flow transducer.
Carburetor?
Different response filters are used depending on whether your engine is
carbureted or fuel injected. The filter for a carbureted engine has a
slower response time to reduce sudden fluctuations in readings. The
higher the number, the more filtering (the reading is smoother).