CO-AX Carbon Monoxide Sensors - Alphasense - (Version JPG) - Page n° 2 - PDF Catalogue | Technical Documentation

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Carbon dioxide sensor, Nitrogen dioxide sensor, NDIR sensor, Oxygen sensor, Nitrogen monoxide sensor

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Figure 2 CO Sensitivity Temperature Dependence


	1-1⁹! 120*
	inn i
	............................ —80
			-•-Mean
			-■— +95% conf. "-95% conf."
	20
	0

Figure 2 shows the variation in sensitivity caused by changes in temperature.

This data is taken from a typical batch of sensors. The mean and ± 95% confidence intervals are shown.

o o

œ o

& <D

-30 -20 -10 0 10 20

Temperature (^oC)

Figure 3 Hydrogen Sensitivity Temperature Dependence


1-400-n
300	J?


150
		-♦-Mean
		*-»- "+95% conf." -- "-95% conf."**

Figure 3 shows the strong temperature dependence of the CO-AX to hydrogen. Since hydrogen sensitivity is less than 4% at 20^oC, hydrogen interference can practically be ignored at low temperatures. However, at 50^oC hydrogen interference is14%.

_C)

o o

CN O T3

_re

-30

-10

-20

Temperature (^oC)

Figure 4 Hydrogen Cros

nsitivity at 3

70000 t


900 ppm CO		900ppmCO + 500ppmH₂
_~— ']
		f I

			400 ppm CO + 300 ppm H2
	300 ppm CO		^-1

	I

Figure 4 shows hydrogen sensitivity for a typical batch of eight CO-AX sensors at 30^oC. All sensors show less than 5% cross sensitivity when 500ppm hydrogen is added to 950ppm carbon monoxide. The is less than 45 seconds.

60000 4

50000 4

40000 4

_ut

_tp _ut

30000 4

20000 4

10000 4

250

450 650

Time (seconds)

850

1050

For further information on the performance of this sensor, on other sensors in the range or any other subject, please contact Alphasense Ltd. For detailed application notes go to "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/COAX/Issue 12

CO-AX Carbon Monoxide Sensors - Alphasense - #2

Carbon dioxide sensor, Nitrogen dioxide sensor, NDIR sensor, Oxygen sensor, Nitrogen monoxide sensor