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miniDaqu — Manual 9.1 Fuel Pressure
9.1.3 Configuration
Various sensor configurations are given in tables listed next. The Max value
or sometimes Ref val. must be always set in bar unit. If the sensor limit is
specified in PSI, convert this to bar and set this the value in bars into channel
configuration. 1 PSI equals to 0.06894757 bar. The following table lists some
common conversions.
PSI bar
7 0.48
15 1.03
35 2.41
70 4.83
100 6.89
150 10.34
Table 7: Conversion table of PSI to bar for commonly used pressures sensors.
Always enter bar value during channel configuration.
9.1.4 Variable Voltage
Sensors with variable voltage output were described in section 3.5.1. Connec-
tion example is given on Figure 6. It shows an active sensor with 0.5 – 4.5 V
output. The sensor in example requires 5 V to operate.
The sensor configuration is shown on Table 8. 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 E or F
Function Fuel pressure
Sensor Active 0.5 – 4.5 V
Report time 0.5 – 1.0 s
Filter 2.0 s
Max value (at 4.5 V) 10 (depends on sensor)
Table 8: An example of active pressure sensor with 0.5 – 4.5 V output. Max
value is set to 10 bar.
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