MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 53
Should you set an alarm level outside of the visible range of the gauge, this will not disable
the alarm. Select the alarm level to be above the maximum expected level in order to disable
the alarm.
Oil pressure bargraph should be set for range in bar (5-8 bars is typical for most engines).
The alarm level is typically set to 2 bars, below which the alarm will be activated. Should you
not use an oil pressure indication, please turn the bargraph off by setting the label to read
“off”.
The various settings, ranges and levels you select here will determine the way the gauges
are drawn on the display.
The top 6 bargraph settings relate directly to the four thermocouple inputs and two Rotax 912
type CHT channels available on the RDAC IV unit.
The first four lines (BG1 to BG4) are equivalent to RDAC channels TC1 to TC4. BG5 is CHT1
and BG6 is CHT2.
Please note that it is not possible to enable CHT1 (BG5) and the Water temperature bargraph
at the same time. This is because these two items share the same physical connection on the
RDAC IV unit.
Sender type selection
The sender type selection menu is used to select the kind of senders you have connected.
The RDAC unit supports 4 thermocouple inputs as well as two N-Type inputs intended for
use with 912/914 engines that have two built in NTC CHT senders.
EGT senders are practically always K type thermocouples. CHT senders (the types used on
spark plug bases) are mostly K types as well but sometimes J types are used. J types are
found mostly for U.S. made instruments.
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