α O2-E2 Oxygen Sensor S Technical Specification Figure 1 O2-E2 Schematic Diagram 24.6 All dimensions in millimetres (± 0.1mm) Top View PERFORMANCE Bottom View Side View Output Response time Zero current Pressure sensitivity Linearity Hysteresis Hand aspirator response µA @ 20.9% O2 t90 (s) from 20.9% to 0% O2 µA in N2 % 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 <1 > 24 ENVIRONMENTAL Humidity sensitivity CO2 sensitivity % O2 change: 0% to 95% rh @ 40°C % change in output / % CO2 @ 5% CO 2 < 0.7 0.1 PHYSICAL DIMENSIONS Diameter Height Weight mm (including label) mm (excluding foam ring) g 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 20°C (store in sealed pot, unshorted Ω (recommended) -30 to 55 80 to 120 5 to 95 6 47 to 100 (% change of output)/(% change of pressure) @ 20kPa 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: [email protected] Website: www.alphasense.com α O2-E2 Performance Data S Figure 2 Sensitivity Temperature Dependence 106 Figure 2 shows the variation in sensitivity caused by changes in temperature. % Output (relative to output @ 20oC) 104 102 100 98 96 See Application Note: AAN 110 on our website 94 Mean "+95 conf." "-95 conf." 92 90 88 86 84 82 80 -30 -20 -10 0 10 20 30 40 50 Temperature oC Figure 3 10kPa Pressure Step Performance 900 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. 800 700 Output (uA) 600 500 400 This repeatability was tested on sensors six months old. 300 200 100 0 0 50 100 150 200 250 300 Time (seconds) Figure 4 Response Profile 350 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. 300 Output Output(uA) (uA) 250 200 150 100 50 0 0 100 200 300 400 500 600 700 800 900 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. ( ©ALPHASENSE LTD ) Doc. Ref. TDS/O2E2/ Issue 12