How To Clean Philips Air Purifier Sensor

Two Philips AC6608, PM2.5 sensor failure after 2 years of use, the phenomenon is that the measurement value is single digits, such as 2 or 3, and the outside air quality exceeds 100 at this time.

Suspected sensor failure, call after-sales service, after-sales service said that the machine needs to be repaired, can not be repaired on-site, and the price may be expensive.

After disassembling the machine, it is found that the sensor model is the Japanese Shinei PM2.5 dust sensor PPD42. It seems that the workmanship is very bad. There is a Taobao selling this sensor, 15 domestically, 31 imported.

I placed an order and bought an imported one. After receiving it, I replaced it and it returned to normal.

It's useless to remove the old feeling, just try to disassemble the sensor to see the principle inside

After dismantling, it was found that there was a light-emitting diode, lens, and photodiode inside the plastic case of the sensor.

And there is a layer of white mist on the other side of the lens. Wipe clean the lens and two diodes, and then install the machine. It is found that the reading of the old sensor is normal. .

It seems that there is no need to buy a new sensor.

This broken sensor is very poorly sealed, and there will be white fog on the inner side of the lens. I don't know how this white fog is generated.

In addition, the original filter under Tucao is very rubbish, and it has a sour taste after 1 month. Baidu checked it and knew that someone responded like this

After the purifier is used for a long time, it will indeed produce a sour taste. But the time for different filter structures to produce sour taste varies greatly. Generally use the purifier with carbon cloth (most brands on the market use it, the initial effect of the carbon cloth is good, but it is not durable, to achieve the same CADR value, the cost of using the carbon cloth is low), most of 1-2 months It will produce a sour taste. The main thing is that a lot of glue is used to clamp the carbon cloth. Generally, 70% of the carbon powder + 30 hot melt adhesive powder is used to stick the carbon powder on the filter cloth, and the thickness of the carbon layer is only about 0.5mm. In the summer of high temperature and high humidity, it is particularly easy to produce sour taste, because high humidity and high humidity bacteria are easy to multiply on the filter cloth, ferment and decompose glue, and produce sour taste. The other is that the carbon layer is too thin and will soon become saturated with adsorption, and it will fail within a month or two. There are also a small number of machines that use conventional honeycomb charcoal, such as Amway, Blujar 510 (the old filter is, the new model does not seem to be honeycomb charcoal), Forest Princess 03 and other models, which use granular activated carbon. The filter screen of this model is large, thick and heavy. The cost of the filter is relatively high. But it can take a year or two to produce a sour taste. Because granular activated carbon does not use glue, the carbon layer is thick, and the service life of the filter element is relatively long.

I also think of the sour smell when the air conditioner is turned on in my previous car, which may be the reason