Our products have two advantages. firstly fast response and stable signal. Most of our sensors T90 are less than the vast majority of domestic and overseas manufacturers, further more the signal is stable and does not degrade. Secondly good product consistency. The products are assembled semi automatically, so the difference between each batch or same batch is very small, it is important for the premium instrument manufacturer. Impossible to write a specific program for each sensor in the mass production, mainly temperature compensation program. Actually only single set of program written for each model instrument, If the sensors consistency are not good, in conditions of high temperature or low temperature environment the instrument accuracy is getting lower. To use sensor from Aeri instrument manufacturers just write one set of temperature compensation program to eliminate the effect of temperature. The following we take the most commonly used carbon monoxide sensor 4CO-S to illustrate.

      Figure 1 - Product response curve
       On figure 1 shows the signal change, 30pcs model 4CO-S sensor at a sampling frequency 1Hz, test in the air one minute and then pass into 50ppm carbon monoxide for four minutes. After carbon dioxide introduced the sensors response is very rapid, signals keep stable soon and then no attenuation. From the figure we find 30pcs sensors signal differences are small, basically coincide.

Channel	Sensitivity(nA/ppm)	T90(S)
Ch-1	74.9	13
Ch-2	74.9	13
Ch-3	77.9	14
Ch-4	78.3	13
Ch-5	75.1	13
Ch-6	76.8	15
Ch-7	71.8	14
Ch-8	73.6	13
Ch-9	73.9	13
Ch-10	70.5	13
Ch-11	76.1	16
Ch-12	71.1	14
Ch-13	76.1	14
Ch-14	74.8	14
Ch-15	74.3	15
Ch-16	72.7	13
Ch-17	75.3	14
Ch-18	73.1	13
Ch-19	73.2	15
Ch-20	73.4	14
Ch-21	76.1	13
Ch-22	76.9	14
Ch-23	72.6	13
Ch-24	77.2	16
Ch-25	74.9	13
Ch-26	74.5	13
Ch-27	75.5	13
Ch-28	74	13
Ch-29	73.1	14
Ch-30	71.4	14
AVERAGE	74.5	14
+95% conf.	77.8	15
-95% conf.	71.2	12
3*Std Dev	6	3

 Chart 1 - Data processing results
      The following is a quantitative analysis of the two key performance parameters obtained from the data processing of Fig. 1. On Chart 1 We find the sensitivity difference between each sensor and T90 are very small. When the average sensitivity 74.5nA/ppm, 3*Std Dev is only 6nA/ppm; the average T90 are 14 Seconds, 3*Std Dev is only 3 Seconds. In fact, the temperature coefficient difference between each sensor is also very small,
The temperature coefficient is not a necessary test for each Lot. sensors, but in the future we will list the relevant test data.