Gas Sensors Life; Table Of Gas Sensor Life - E Instruments E4500 Operating & Maintenance Manual

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
CODE
Flex-Sensor O
Cod. AACSE11
Flex-Sensor O
Cod. AACSE15
Flex-Sensor CO+H
Cod. AACSE12
Flex-Sensor CO high
(H Comp)
2
Cod. AACSE20
Flex-Sensor NO
Cod. AACSE10
Flex-Sensor NO
Cod. AACSE14
Flex-Sensor SO
Cod. AACSE13
Flex-Sensor CO
100,000 ppm
Cod. AACSE17
Flex-Sensor CO
20,000 ppm
Cod. AACSE18
FLEX-Sensor CxHy
0-5.00% vol. referred to CH4
Cod. AACSE23
Flex-Sensor sniffer
Cod. AACSE19
Flex-Sensor CO+H
low range
Cod. AACSE24
Flex-Sensor NO low range
Cod. AACSE25
Flex-Sensor NO low range
2
Cod. AACSE26
Flex-Sensor SO low range
2
Cod. AACSE28
Flex-Sensor CO
Cod. AACSE29
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.
MEASURED GAS
O
2
2
Oxygen
O
2
2
Oxygen
CO
2
Carbon Monoxide
CO
Carbon Monoxide
NO
Nitrogen Oxide
NO
2
2
Nitrogen Dioxide
SO
2
2
Sulphur Dioxide
CO
Carbon Monoxide
CO
Carbon Monoxide
CxHy
Unburned Hydrocar-
bons
Sniffer
Methane / LPG
2
CO
Carbon Monoxide
NO
Nitrogen Oxide
NO
2
Nitrogen Dioxide
SO
2
Sulphur Dioxide
CO
2
2
Carbon Dioxide
IDENTIFYING
(1)
AVERAGE LIFE
COLOR
Yellow 24 months
>24 months
Red 48 months
>36 months
Orange 48 months
Withe 36 months
Green 36 months
Purple 48 months
Blue 48 months
48 months
60 months
Red 48 months
Orange 48 months
Withe 48 months
Green 48 months
>48 months
120
RECALIBRATION
not necessary
not necessary
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
(2)
Yearly
K000000000EJ 023826A0 100714