【Review SGP40】-SGP40 test

elike

【Review SGP40】-SGP40 test [Copy link]

1 Experimental conditions

One spoonful (<10mL) of alcohol, 4 disposable cups (180mL), constant temperature and humidity chamber

2 Experimental procedures

2.1 Preparation of solutions of different concentrations

Add a small spoonful of alcohol to disposable cup 1, fill it up and mix well, take out half of it and put it into cup 2, fill cup 2 with tap water, take out half of it and pour it into cup 3, then fill cup 3 with tap water, take out half of it and pour it into cup 4, then take out half of the solution in cup 4. The solution in cup 4 is the reference solution.

2.2 Calibration

Turn on the constant temperature and humidity chamber, set the temperature to 30 degrees Celsius and the humidity to 50%. Connect the computer and the entire module, then place the gas sensor above cup 4 and measure for one hour with power on.

2.3 Testing

At around 17:00, move the sensor above cup 3 and observe the changes in the measured values.

At around 19:00, move the sensor above cup 2 and observe the changes in the measured values.

At around 20:10, move the sensor above cup 1 and observe the changes in the measured value.

Around 9 p.m., I added a little more alcohol and found that the upper curve had reached its maximum value of 500.

2.4 Test Results

Serial number	Temperature(℃)	Humidity (RH%)	Alcohol content in gas (ppm)	VOC raw
4	30.7	44.9	175	26179
3	30.7	44.6	471	25080
2	30.4	46.3	>500	24260
1	30.6	45.0	>500	23520

question

1 When in use, water sometimes seeps from the outer wall of the disposable cup, making it impossible to lower the humidity in the constant temperature and humidity chamber.

2 When testing VOC, try to select low concentrations to prevent output results from being saturated.

3 During the measurement process, try to cover each cup and ensure that they do not affect each other.

littleshrimp

major

okhxyyo

This experiment is amazing~~~ Great, great, great, I give you 101 points, I'm not afraid of you being proud~~

elike

littleshrimp posted on 2021-2-25 10:09 Professional

I have used the equipment in the laboratory and have just started testing. There are still many problems.

Jacktang

Well done, thumbs up

damiaa

I have not yet figured out how to convert between the VOC Index and the ppb unit of VOC.

No information was found on this aspect.

The sgp30 used before was in ppb units, but now sgp40 can only calculate voc Raw and vod Index.

I don't know if the author has done any research on this.