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Current-Voltage Conversion Graph with 220 Ohm Load Resistance
0 4 5 10 15 20
VDC
mA
0,88 1,1 2,2 3,3 4,4
/-5%
Sensor Output relative to Oxygen content in Air - % vol.
If the device does not start up.
Check that the 12/24 Vdc power is present, and that positive and negative polarity has not been inverted.
If the Fault LED lights up - If the fault signal reaches the control unit connected to the sensor.
Check that the cables are connected according to the drawing, and that the wire isolation sheath has not
been pinched.
Check the voltage between terminals 1-2. It must be higher than 10,80 Vdc and lesser than 26,4 Vdc.
Check the voltage between terminals 2-3. It must be a minimum of 0.8 Vdc to a maximum of 1.1 Vdc.
Important Note:
These measurement should be perfor-
med in clean/fresh air.
Moreover, this test must be perfor-
med only with the probe connected
to a control unit, or with a 220 Ohm
resistance installed between terminal
2 and terminal 3.
Troubleshooting before calling a technician
Power supply
12÷24 VDC
Linear ouput 4-20 mA
3 2 1
R
0 18,5 19,5 20,9 22,5 23,5 25.0
%vol
O
xy
gen
N
ormal le
vel
Pr
e-alarm
Pr
e-alarm
Deficienc
y
O
xy
gen alarm
Ex
cess
O
xy
gen alarm
20
19.4
18.4
17.4
16.5
15.8
4
0
mA
-
+
0
1
3
2
1,1
V.
Voltmeter