Information On Drägersensor O 2 -Ls (6809630) - Dräger Polytron 7000 Instructions For Use Manual

Information on DrägerSensor O
Principle of measurement:
Reaction at the measuring electrode:
Reaction at the counter-electrode:
Ambient conditions:
Operational Characteristics
storage (in original packaging)
Measured value time setting:
t :
0...20
t
0...90
Calibration:
Flow rate:
Zero gas
Calibration gas
Warming-up time:
Sensor is ready to operate after
Sensor is ready to calibrate after
Cross sensitivities
The table shows the reactions of the sensor to other gases than the measured gas (cross sensitivities). The listed val-
ues are typical and are valid for new sensors. The table does not lay a claim on completeness. Gas mixtures can be
displayed as the sum of all components. Gases with negative sensitivity can cancel out a positive sensor display. The
influence of the O displacement is in not taken into account in the table.
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Example:
With 2 Vol.-% ethylene in the air – measurement value deviation due to cross sensitivities (table value) = –1 Vol.-% O
O displacement caused by 2 Vol.-% ethylene (2% of 20 Vol.-% O
2
Polytron transmitter display (20.9 – 1 – 0.4) = 19.5 Vol.-% O
Gas / vapour
acetaldehyde
acrylonitrile
ammonia
arseniuretted hydrogen
butadiene
tert-butylmercaptane
chlorine
hydrogen chloride
hydrocyanic acid
boroethane
1.1-dichloroethane
diethylamine
diethyl ether
epichlorhydrine
ethanol
-LS (6809630)
2
The DrägerSensor O -LS (6809630) is an electrochemical three-electrode-sensor for measurement of
2
oxygen (O ) in air. The sensor can only be operated in connection with a suitable Dräger transmitter.
2
The sensor cannot be used for oxygen measurements in the presence of helium!
+ –
O + 4 H + 4 e => 2 H O
2 2
+ –
2 H O => O + 4 H + 4 e
2 2
o o
-40 C to 60 C, short-term up to 65
700 hPa to 1300 hPa
5 to 95 % relative humidity, non condensing
o o
0 C to 40 C
<12 seconds
<30 seconds
0.5 L/min
Nitrogen (99.9 Vol.-% N )
2
Oxygen / nitrogen - mixed gas
≤90 minutes
≤6 hours
2
Chemical symbol
CH CHO
3
H C=CH–CN
2
NH
3
AsH
3
CH CHCHCH
2 2
(CH ) CSH
3 3
Cl
2
HCl
HCN
B H
2 6
C H Cl
2 4 2
(C H ) NH
2 5 2
(C H ) O
2 5 2
C H OCH Cl
2 3 2
C H OH
2 5
Metrological certificate of approval
o
C
) = –0.4 Vol.-% O
2 2
.
Gas concentration
50 ppm
80 ppm
50 ppm
3 ppm
50 ppm
4 ppm
8 ppm
20 ppm
20 ppm
5 ppm
50 ppm
100 ppm
400 ppm
35 ppm
250 ppm
Measurement value devia-
tion in Vol.-%
with dust filter
no influence
no influence
no influence
no influence
no influence
no influence
no influence
no influence
no influence
no influence
no influence
no influence
≤ 0.1 (–) *
no influence
no influence
2
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