miniDaqu — Manual
9.8
Fuel Flow
Option
Selection/Setting
Channel
Y only
Function
Rotor RPM
Sensor
Digital Pulse
Report time
0.2 – 0.5 s
Filter
about 0.5 s
Pulses
72
Reduction
1.0
Table 18:
An example for rotor RPM connected to Y channel. Sensor is in
rotor head, hence the reduction ratio is set to 1.0. Your case will
be different.
Option
Selection/Setting
Channel
Y only
Function
Rotor RPM
Sensor
Digital Pulse
Report time
0.2 – 0.5 s
Filter
about 0.5 s
Pulses
2
Reduction
5.814
Table 19:
Another example for rotor RPM connected to Y channel. Sensor
measures shaft directly from engine drive with two pulses per shaft
revolution. The shaft turns rotor via reductor. Reductor’s ratio is
5.814. Your case will be different.
9.8
Fuel Flow
Fuel flow sensors are active sensors with
pulse
output. Each sensors gives
out specific number of pulses per some volume and this value must be set to
Daqu. Daqu expects number of pulses per liter.
Almost all sensors are NPN type (FlosScan, FT-60). Connection schematics
is given on figure 10. Refer to the sensor documentation for proper connection
and operating voltage.
Sensors are either calibrated, where each sensors has its own value attached
to it (FloScan sensors, for example), or a general number for all sensors of the
same type is given (FT-60, for example).
47
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