E Instruments E500 - 10 Sensors; Sensors Arrangement; Sensor Types and Relevant Positioning; Gas Sensor Life

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10.0
SENSORS
10.1 Sensors arrangement
10.2 Sensor types and relevant positioning
CODE
POSITION
S1 S2 S3
O
2
Sensor
Cod. AACSE55

CO Sensor with NOx filter
0-4000ppm
Cod. AACSE58

NO Sensor
Cod. AACSE60

10.3 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 E INSTRUMENTS service centre.
Table 10.4 illustrates the characteristics inherent to each sensor.
10.4 Gas sensors life table
CODE
MEASURED GAS AVERAGE LIFE RECALIBRATION
O
2
Sensor
Cod. AACSE55
O2
Oxygen
24 months not necessary
CO Sensor with NOx filter +
H2 immunity
0-4000ppm
Cod. AACSE58
CO
Carbon Monoxide
24 months Yearly
NO Sensor
Cod. AACSE60
NO
Nitric Oxide
>36 months Yearly
POSITION
S2 CO
POSITION
S3 NO
POSITION
S1 O2
15/06/18 10:00
SENSOR
►S1:O2 OK
S2:CO OK
S3:NO OK
SENSORS ARRANGEMENT INSIDE
THE SENSORS COMPARTMENT
GRAPHICAL DISPLAY OF ARRANGEMENT