120
K000000000EJ 023826A0 100714
14.3 Gas sensor 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 center. Chart 14.4
illustrates the characteristics inherent to each sensor.
14.4 Table gas sensors life
Notes:
(
1
)
Colored dot on the sensor electronic board.
(2) UNI 10389-1 standard requires for the instrument calibration once per year to be performed in a laboratory
authorised to issue calibration certificates.
CODE MEASURED GAS
IDENTIFYING
COLOR
AVERAGE LIFE RECALIBRATION
Flex-Sensor O
2
Cod. AACSE11
O
2
Oxygen
Yellow 24 months not necessary
Flex-Sensor O
2
Cod. AACSE15
O
2
Oxygen
>24 months not necessary
Flex-Sensor CO+H
2
Cod. AACSE12
CO
Carbon Monoxide
Red 48 months Yearly
(2)
Flex-Sensor CO high
(H
2
Comp)
Cod. AACSE20
CO
Carbon Monoxide
>36 months Yearly
(2)
Flex-Sensor NO
Cod. AACSE10
NO
Nitrogen Oxide
Orange 48 months Yearly
(2)
Flex-Sensor NO
2
Cod. AACSE14
NO
2
Nitrogen Dioxide
Withe 36 months Yearly
(2)
Flex-Sensor SO
2
Cod. AACSE13
SO
2
Sulphur Dioxide
Green 36 months Yearly
(2)
Flex-Sensor CO
100,000 ppm
Cod. AACSE17
CO
Carbon Monoxide
Purple 48 months Yearly
(2)
Flex-Sensor CO
20,000 ppm
Cod. AACSE18
CO
Carbon Monoxide
Blue 48 months Yearly
(2)
FLEX-Sensor CxHy
0-5.00% vol. referred to CH4
Cod. AACSE23
CxHy
Unburned Hydrocar-
bons
48 months Yearly
(2)
Flex-Sensor sniffer
Cod. AACSE19
Sniffer
Methane / LPG
60 months Yearly
(2)
Flex-Sensor CO+H
2
low range
Cod. AACSE24
CO
Carbon Monoxide
Red 48 months Yearly
(2)
Flex-Sensor NO low range
Cod. AACSE25
NO
Nitrogen Oxide
Orange 48 months Yearly
(2)
Flex-Sensor NO
2
low range
Cod. AACSE26
NO
2
Nitrogen Dioxide
Withe 48 months Yearly
(2)
Flex-Sensor SO
2
low range
Cod. AACSE28
SO
2
Sulphur Dioxide
Green 48 months Yearly
(2)
Flex-Sensor CO
2
Cod. AACSE29
CO
2
Carbon Dioxide
>48 months Yearly
(2)
(1)
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