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3.5 Analog Active Sensors miniDaqu — Manual
An active sensor with voltage output usually has three wires. +5/+12 V
sensor input wire is connected to appro5/+12 V pin on Daqu, ground
wire to GND on Daqu and the sensor signal output wire to one of B, D, E or
F channels.
The sensor signal output voltage must be limited to 5 V. Higher voltage may
permanently damage Daqu.
A few different standards appear within this voltage range.
ˆ
0.5 – 4.5 V output range is the most frequent one. The sensor outputs
0.5 V when not loaded and 4.5 V when it is maximally loaded.
ˆ
0 – 5 V output range. Sensor outputs 0.0 V, when not loaded and 5 V
on maximal load.
ˆ
0.25 – 4.75 V output range. Sensor outputs 0.25 V, when not loaded
and 4.75 V on maximal load.
Figure 6 illustrates an example of active sensor with voltage output connected
to an E channel. The sensor requires 5 V to operate, but some other sensor
might require 12 V. Check sensor’s specs.
V
C
1
2
1
-
+ BAT
V
GND 3
+5 V 4
AUX 5
6
F
1
F
2
FUEL
P
E
2
7 FL
2
GND 8
E
1
9 FL
1
Y
1
10 ROTOR
GND
+12 V
Signal 0-5V
11
12
Figure 6: An example of active sensor with voltage output.
3.5.2 Current Output
Some active sensors have varying current. The current vary between 4 mA
when sensor is unloaded and 20 mA when sensor is fully loaded. These sensors
are connected F channels only. These channels have an internal 220 Ω resistor,
which is automatically engaged when current output sensor is selected.
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