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9.2 Fuel Pressure - Rotax iS miniDaqu — Manual
9.1.5 Variable Current
A connection example for current varying sensor is given. The sensor from
example requires 12 V for power. Signal output is currect between 4 and 20
mA. Sometimes these sensors are grounded via engine block, so GND lead is
not connected. Figure 7 shows connection schematics.
Corresponding configuration is shown in Table 9. Only F channels shall be
used with variable current sensor. These channels have high precision internal
resistor, which is automatically activated when
4-20 mA Int Res sensor is
selected. Because this sensor is a generic one, max value (or reference value)
must be also specified. This value is sensor specific.
Option Selection/Setting
Channel Any F
Function Fuel pressure
Sensor 4-20 mA Int Res
Report time 0.5 – 1.0 s
Filter 2.0 s
Max value (at 20 mA) 10 (depends on sensor)
Table 9: Typical fuel pressure configuration for sensors with current output.
Max value is set to 10 bar.
9.2 Fuel Pressure - Rotax iS
Rotax ECU does not have a fuel pressure sensor. In order to measure and
indicate fuel pressure a sensor must be connected to Daqu. Reference fuel
pressure is about 3 bar. Example on Figure 24 shows the most often used
solution with a 10 bar sensor. The sensor has a voltage output in 0.5 to 4.5
V range.
9.2.1 Configuration for Vented Gage Sensor
The channel used for this sensor must be also properly configured. Table 10
shows example.
Note that Fuel P. cmp is used for the function. This abbreviation stands for
Fuel Pressure Compensated . This means that fuel pressure is calculated in
a special way from three different values: fuel pressure measured by sensor
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