Dräger Polytron 8100, Инструкция по эксплуатации, Страница: 41 / 254

Technical data
Dräger Polytron 8100 41
10.1.3 DIN EN 50104 for DrägerSensor O
2
LS (6809630)
Sensor Principle
The DrägerSensor O
2
LS (6809630) is an electrochemical
three-electrode sensor for measuring Oxygen (O
2
) in ambient
air.
NOTICE
The sensor cannot be used for Oxygen measurements
in the presence of Helium!
Reaction at electrodes
Measuring electrode
O
2
+ 4 H
+
+ 4 e
–
=> 2 H
2
O
Counter electrode
2 H
2
O => O
2
+ 4 H
+
+ 4 e
–
Environmental parameters
Pressure 20.7 to 38.4 in. Hg (700 to1300 hPa)
Humidity 5 to 95%RH, non-condensing
Temperature -40 to +60 °C, short term up to +65 °C
Storage temperature 0 to +40 °C
Storage humidity 5-95%RH, non-condensing (relevant
if sensor package is opened)
Influence on environmental parameters
Temperature
In the range -40 to 65 °C
Zero point < ± 0.3 Vol% O2
Span < ± 0.3 Vol% O2
Pressure
In the range 700 to 1300 hPa
Zero point deviation < ± 0.1 Vol% O2
Span: Relative deviation from reading at 1013 hPa: < 2% of
measurement value / 100 hPa
Humidity
In the range 5% r.H to 95% r.H
Zero point no relevant influence
Span: Relative deviation from reading at 50% r.H: < 2.5% of
measurement value
i i
Response time
t
0...20
< 14 seconds
t
0...90
< 45 seconds
For measurement range: 0-5 Vol% O2
t
0...20
< 10 seconds
t
0...90
< 27 seconds
For measurement range: 0-25 Vol% O2
In the measurement range 0-5 Vol% the t
0...20
response time
(15 seconds) is higher than the permissible limit of the
EN 50104.
Stabilization time 5 x t
0...90
Calibration
Flow rate 0.5 L/min
Zero gas Nitrogen (99.9 Vol% N
2
)
Target gas Oxygen / Nitrogen gas mixture
Recommended calibration interval
9 month
Selectable range: 1 day to 18 months
Warm-up time
Operation < 20 minutes
Calibration < 6 hours
Measurement range
0-5...25 Vol% O2, 0-25 Vol%
O2 minimum reading: -1.25 Vol% O2