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S
O2-E2 Oxygen Sensor
Figure 1 O2-E2 Schematic Diagram
Technical Specification
24.6
All dimensions in millimetres ( 0.1mm)
Top View
Bottom View
Side View
PERFORMANCE
Output Response time Zero current Pressure sensitivity Linearity Hysteresis Hand aspirator response
A @ 20.9% O2 t90 (s) from 20.9% to 0% O2 A in N2
(% change of output)/(% change of pressure) @ 20kPa
% O2 deviation @ 30% O 2 % O2 change after 16 cycles: 0 to 20.9% O2 % O2 change during aspiration (typical)
260 to 315 < 15 <5 < 0.1 < 0.6 < 0.2 20 to 21.5
LIFETIME
Output drift Operating life
% change in output @ 3 months months until 85% original output of 20.9% O2 % O2 change: 0% to 95% rh @ 40C % change in output / % CO2 @ 5% CO 2 mm (including label) mm (excluding foam ring) g
<1 > 24
ENVIRONMENTAL
Humidity sensitivity CO2 sensitivity Diameter Height Weight
< 0.7 0.1
PHYSICAL DIMENSIONS
22.2 24.6 < 33
KEY SPECIFICATIONS
Temperature range Pressure range Humidity range Storage period Load resistor
C kPa % rh continuous (0 to 99% rh short term) months @ 3 to 20C (store in sealed pot, unshorted (recommended)
-30 to 55 80 to 120 5 to 95 6 47 to 100
NOTE: all sensors are tested at ambient environmental conditions, with 47 ohm load resistor, unless otherwise stated. As applications of use are outside our control, the information provided is given without legal responsibility. Customers should test under their own conditions, to ensure that the sensors are suitable for their own requirements.
Alphasense Ltd, 3 Oak Industrial Park, Great Dunmow, Essex. CM6 1XN, UK Telephone: +44 (0) 1371 878048 Fax: +44 (0) 1371 878066 E-mail: sensors@alphasense.com Website: www.alphasense.com
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O2-E2 Performance Data
Figure 2 Sensitivity Temperature Dependence
106
% Output (relative to output @ 20oC)
104 102 100 98 96 94 92 90 88 86 84 82 80 Mean "+95 conf." "-95 conf."
Figure 2 shows the variation in sensitivity caused by changes in temperature.
See Application Note: AAN 110 on our website
-30
-20
-10
0
10
20
30
40
50
Temperature oC
Figure 3 10kPa Pressure Step Performance
900 800
700
600
Output (uA)
500
Step changes in pressure can cause a temporary signal transient. Positive pressure gives an output signal increase whilst negative pressure causes the output signal to decrease. This repeatability was tested on sensors six months old.
400
300
200
100
0 0 50 100 150 200 250 300
Time (seconds)
Figure 4 Response Profile
350 300 250
Output (uA) Output (uA)
200 150 100 50 0 0 100 200 300 400 500 600 700 800 900
Figure 4 shows the time taken for a typical O2-E2 sensor to reach 90% of its maximum output. This is termed the t 90 response time and for these sensors is less than 10 seconds.
Time (seconds) For further information on the performance of this sensor, on other sensors in the range or any other subject, please contact Alphasense Ltd. For Application Notes visit "www.alphasense.com".
In the interest of continued product improvement, we reserve the right to change design features and specifications without prior notification. The data contained in this document is for guidance only. Alphasense Ltd accepts no liability for any consequential losses, injury or damage resulting from the use of this document or the information contained within it. ( (c)ALPHASENSE LTD ) Doc. Ref. TDS/O2E2/ Issue 12

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