ZG09 CO
2
Module
http://www.ZyAura.com
REV. 082018
9.2 Temperature cycle test
16 samples were on long-term test (-20°C, +65, +60°C, 85% RH, 400 hours) and the average results are shown in Figure 5.
The Y axis is the CO
2
concentration and the X axis is the time.
Figure 5
9.3 High/Low temperature test
The performance of CO
2
, at -20°C~60°C and 5V±0.25V, is displayed on Figure 6. The performance is consistent in 4.75~5.25V.
The accuracy will be affected when the voltage drops to 4.5V.
Figure 6
10. Response Time
It shows how much time is needed for CO
2
monitor to reach the 90% response to step change. Test methods 1: putting the
monitor in the environment at 1,000ppm in 10 minutes, then move it to the environment at 400ppm.
Test method 2: putting the monitor in the environment at 400ppm in 10 minutes, then move it to the environment at 1,000ppm.
Test Method
Time
400ppm~1,000ppm
~60sec (90% response to step change)
1,000ppm~400ppm
~120sec (90% response to step change)
11. CO
2
RMS Noise
Measure for 3 hours in conditions: CO
2
concentration of 1000ppm and 25°C±2°C.
The stability and variation are less than ±20ppm.
Figure 7