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K100000000S9 036103 130121
15.2 Sensor types and relevant positioning
S1
S2
S3
O
2
Sensor
Cod. AACSE50
CO Sensor with NOx filter
0
-
4000ppm
Cod. AACSE58
NO Sensor
Cod. AACSE60
CODE
POSITION
15.3 Gas sensors life
The gas sensors used in this instrument are electrochemical: thus, when the relative gas is detected, a chemical
reaction takes place inside them that generates an electrical current.
The electrical current acquired by the instrument is then converted into the corresponding gas concentration.
Sensor life is strongly related to the consumption of the reagents within.
Sensor characteristics diminish as the reagents are consumed and when these have been used up completely
the sensor must be replaced. The sensors must be recalibrated on a regular basis to assure measuring accuracy:
recalibration can only be performed by a qualified Seitron Americas service center.
Table 15.4 illustrates the characteristics inherent to each sensor.
GRAPHICAL DISPLAY OF ARRANGEMENT
15/06/18 10:00
SENSOR
►S1:O2 OK
S2:CO OK
S3:NO OK
SENSORS ARRANGEMENT INSIDE
THE SENSORS COMPARTMENT
15.0 SENSORS
15.1 Sensors arrangement
POSITION
S1 O
2
POSITION
S2 CO
CODE
MEASURED GAS
AVERAGE LIFE
RECALIBRATION
O
2
Sensor
Cod. AACSE50
O
2
Oxygen
24 months
not necessary
CO Sensor with NOx
H2 immunity
0-4000ppm
Cod. AACSE58
CO
Carbon Monoxide
24 months
Yearly
NO Sensor
Cod. AACSE60
NO
Nitric Oxide
>36 months
Yearly
15.4 Gas sensors life table
POSITION
S3 NO