20
For Rotax 912 engines the factor must be set to *1.
The factors for other engines can be obtained from their manufacturers.
Because some engines use a special RPM signal, the ALPHA
ALPHAALPHA
ALPHAMFD can be programmed
to understand this signal with a filter. This filter can be activated or deactivated in SET-
Mode 27 (Default is ROTAX). This enables the unit to understand pulses from 6 … 200
Volts.
WARNING! As long as the ALPHA
ALPHAALPHA
ALPHAMFD reads RPM from a running engine, it
cannot be switched off. This is to prevent the pilot to inadvertently switch off
the instrument during flight.
5.1.2 Capacitive RPM Measurement at ignition cable
(This function is not supported any longer)
5.2 Engine Hour Meter
The ALPHAMFD distinguishes between flight time and engine running time per flight.
Both values are displayed and stored for every flight. They can be recalled in MEMO-
Mode (see section 6) with a resolution of 1 minute.
Additionally, the total running time of the engine of all flights (Engine Hour Meter) is
displayed in SET-Mode 4. This value can not be changed and does not get lost when
disconnecting the power of the ALPHAMFD. The value is shown in full hours.
WARNING! Never disconnect the ALPHAMFD from its power supply before
switching it off. If it is disconnected from the power supply without prior
switching it off, it cannot store some information (e.g. engine hours) in its
memory. Important data will be lost!
5.3 Fuel State and Fuel Flow (Consumption)
5.3.1 Important Safety Information
The fuel state is determined by a special flow sender. It is highly recommended to only
use the flow sender supplied by
BRÄUNIGER
, because other senders are not adapted
to the ALPHAMFD and correct function cannot be guaranteed.
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