Hi Martin,
Since pressing ACK for oil pressure makes the light stop flashing, that is what
is generating the alarm. The light is staying on because the oil pressure is
still out of limits. This is explained on Figure 1b of the EIS manual. Check
that your oil pressure is between the lower and upper limits you have set.
If fuel pressure (Aux input) were causing an alarm, you would have to press Ack
to extinguish that alarm. And setting limits to 0 causes EIS to ignore that
input from an alarm point of view (see page 7 of EIS Manual).
My bet is that you either have low oil pressure limit set higher than what your
oil pressure is indicating or high oil pressure is set lower than what your oil
pressure is indicating. Is your oil pressure indicating what you expect?
Are you using GRT or Rotax oil pressure sending unit? Not sure what a Mitchell
sending unit is but EIS probably isn't calibrated for Mitchell's.
For fuel pressure, the easiest solution is to purchase the sensor from GRT. It
will come with the SF and Offset information. You could calibrate the existing
Mitchell sensor if you have or can obtain the resistance vs pressure data.
Jim Butcher
N241BW
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