3.8
Digital Active Sensors
Daqu — Manual
R
E
1
2
E
2
1
Y
Y
Z
ROTOR
FFLOW
GND
+5 V
1
2
B
1
B
2
I
1
I
2
3
7
6
5
4
8
GND
+12 V
10
9
12
11
1
+
-
RPM
FL
1
FL
Signal 0-5V
2
Figure 12:
An example of potentiometer, connected as variable voltage di-
vider.
equals to number of digital pulses for one revolution. In the case of fuel flow,
the divider equals to number of pulses required per one litre.
The pulse sensors are typically of two types NPN or PNP.
Attention must be paid to apply correct voltage for the sensor. Figures show
connection to a 12 V, but some sensor may require 5 V supply.
3.8.1
NPN – Open Collector Output
Figure 13 illustrates a typical connection for the NPN case. Here all wires are
connected directly.
D
NPN
E
1
2
E
2
1
Y
Y
Z
ROTOR
FFLOW
GND
+5 V
1
2
B
1
B
2
I
1
I
2
3
7
6
5
4
8
GND
+12 V
10
9
12
11
1
+
-
RPM
FL
1
FL
2
Figure 13:
An example of NPN digital sensor connection.
©
Kanardia
2019
22