Air purifier?

[WussRedXLi]

Akai ryu, my CEM ndIR meter tonight arriving ba....lets see how we fare tonight in our HDB room.

 

[redsox]

My TB AX40 hepa by 4PX is indeed 2.92kg, actual weight

Sent from Sony D6653 using GAGT

 

[WussRedXLi]

Wah lao, ask the boss to dont pack like that lah. Waste weight.

 

[Niaoson]

Wah lao, ask the boss to dont pack like that lah. Waste weight.

Is there another way? I got mine the same way haha

 

[Akai Ryu]

Akai ryu, my CEM ndIR meter tonight arriving ba....lets see how we fare tonight in our HDB room.

This is my CO2 data fr last night.

Started at 518ppm moderate range. Noticed that i have yet to receive good CO2 range even when room is aired b4 windows closed for AC.

Switched on AP at same time...Sharp shower auto 1 hr. Noticed how fast the CO2 climb to the 900ppm range within abt initial 30mins. Basically stayed at the not good range till wake up.

 

[Akai Ryu]

I like how you hang it.

lol

I would hang this out 247 if i can waterproof it. My nano waterproof spray cant do much when cant open to apply

 

[JX1983]

Anyone here bought the poiema brand P500 air purifier? Just wish to know how is it? I know the price is very costly..

 

[WussRedXLi]

Is there another way? I got mine the same way haha

When i bought 10 filters, i asked him to pack into 1 big box.

 

[LFC25]

Ok, it's this seller. SOme of the sensor stuff that he sells like TVOC, CO2 is pretty "high-end", more than enough for home use.

https://wclh.world.taobao.com/shop/....7700714.0.0.EqmW2t&user_number_id=2375177132

Thanks. I thought you were recommending Samo Air in the previous posts.

 

[WussRedXLi]

Thanks. I thought you were recommending Samo Air in the previous posts.

Now got new contender. Anyway, all are using Plantower G1. So ok. The module is outputting the data digitally, so the difference is in the module, not the PCB/decoding. eg doesn't matter what brand of resistors or capacitors the PCB is using, it's all decoded by a chip and displayed on the PCB.

Try to get the one with the particle count, geek mode ba.

 

[kandinsky]

Is there another way? I got mine the same way haha

I received one set of four from one seller, he stacked the hepa filters together, wrapped with bubble wrap, then all that in one single cardboard box.

One filter was slightly squashed on one side, but after unwrapping and letting it sit for awhile, more or less went back to original shape.

 

[LFC25]

Now got new contender. Anyway, all are using Plantower G1. So ok. The module is outputting the data digitally, so the difference is in the module, not the PCB/decoding. eg doesn't matter what brand of resistors or capacitors the PCB is using, it's all decoded by a chip and displayed on the PCB.

Try to get the one with the particle count, geek mode ba.

I can't find the one from Insan Tech from Taobao shown in your posts.

 

[WussRedXLi]

I can't find the one from Insan Tech from Taobao shown in your posts.

That one is already sold out. I got it last year.

 

[WussRedXLi]

Working bro never post here

http://aqicn.org/sensor/pms1003/

The Plantower PMS1003 Air Quality Sensor experiment

The PMS 1003 Sensor

The PMS 1003 Sensor is a recent laser based Air Quality Sensor developped by plantower (chinese name: 攀藤 (pānténg)) and used inside a numerous number of air quality sensing devices.

It is also sometimes refered as HK 5001, or labelled under the "oneair" brand, but it is indeed developped and produced by plantower (a Shenzhen based company with office in Beijing).

Specifications

This is the specification for the PMS1003. One should not consider all those values for granted as there is quite often a big difference between what is said to be possible and what is actually possible (and this is why we are setting up all our experiments). •Measuring range: 0.3 to 1.0, 1.0 ~ 2.5, 2.5 to 10 microns (um)
•Range: 0 ~ 500 ug / m3
•counting accuracy of 50% @ 0.3um, 98% @ ≥0.5 um said the quasi-volume : 0.1 liters (L)
•Response time: ≤10 seconds (s)
•DC supply voltage: 5.0 volts (V)
•Maximum Operating Current: 120 milliamperes (mA)
•Standby current: ≤200 microamps (uA)
•Operating temperature range: -20 ~ + 50 degrees Celsius (℃)
•Operating humidity range: 0 ~ 99% RH
•MTBF: ≥ 5 years (Y)
•Maximum size: 65 × 42 × 23 mm


Inside look at the sensor

The sensor comes with a metal casing which is used to prevent from electrostatic discharge (ESD). The inside is enginered like a small dylos monitor:

In terms of electronics, the PMS1003 is simple but yet very efficient. The main CPU is a Cypress CY8C4245, which a combined ARM Cortex-M0 running at 48Mhz with dedicated ADC, used to sample the output from the diode.

In terms of dust accumulation, the situation is actually not so bad since after 6 months running 24/7, the dust would only accumulated next to the air inlet, but not on the diode or laser.

 

[Ronaldo88]

I order ax40 on 25 oct..till nw haven delivered..still in FedEx..

 

[sehsuan]

curious.. fine dust means PM10 and smaller?

Now got new contender. Anyway, all are using Plantower G1. So ok. The module is outputting the data digitally, so the difference is in the module, not the PCB/decoding. eg doesn't matter what brand of resistors or capacitors the PCB is using, it's all decoded by a chip and displayed on the PCB.

Try to get the one with the particle count, geek mode ba.

haha... i had a major false alarm while trying to figure out why it wasn't using CF1 by default. WCLH wasn't able to give an answer, since digital signals are given by the G1, their work was to design the PCB and ship them out as a full off-the-shelf solution... so they've covered their bases with both ATM and CF1 readings. i still catch not enough ball about both these readings... and only Plantower has it as proprietary calculations.

that aside, all the units display ATM + AQI on Screen 1, and CF1 + Particle Count on Screen 2. best of both worlds!

 

[WussRedXLi]

This is my CO2 data fr last night.

Started at 518ppm moderate range. Noticed that i have yet to receive good CO2 range even when room is aired b4 windows closed for AC.

Switched on AP at same time...Sharp shower auto 1 hr. Noticed how fast the CO2 climb to the 900ppm range within abt initial 30mins. Basically stayed at the not good range till wake up.

Got my CEM DT-802 and I got 459 ppm with windows opened. It's extremely sensitive. With me in the room even with opened door + window (but very light wind of about 3kph only), it rises to 480ppm. So you can can see how sensitive it can be and can detect a pax in the room with both the windows and door open with some light wind. Resolution is 1ppm. Refresh rate is about 1 sample per 2 seconds.

The temperature and RH is pretty accurate to, vs my 3 other digital thermo + RH....those are supposedly ok in accuracy and all are within 0.3 deg C range, RH within 5% RH range.

30 mins in the BTO sized bedroom, rose to ~ 850 ppm.


Can work ok with a powerbank, I have the USB cable -> +ve centre plug.


You can set an audible alarm + flashing red screen when it hits a user settable threshold, eg 1300ppm. This alarm feature is probably the most useful aspect (that's why I chose this over the DIY solutions, which are cheaper by about 60 RMB)

Tmr will report on the peak value hit overnight

 

[WussRedXLi]

Peak value reached overnight of 6hr sleep = 2179 ppm of CO2. After waking up and continuing to PCW (like now), it continues to rise to over 2,200ppm 1 pax in HDB bedroom only.
Due to cold air (aircon) seeping through the air gap beneath the door, it stabilises in the 21xx range.

My windows has double rubber seal, pretty air-tight (thunderstorm time, I'd need to keep it properly shut & locked else would have that howling sound coz high wind/high floor).


I think it is very difficult to maintain below 1200ppm, unless you keep a very large gap of 2-3 inches open for the door and using the cold air draft from the aircon to assist in gaseous exchange.

Note : CO2 toxicity is reached before insufficient oxygen condition is reached.

The U.S. EPA CO2 exposure limits: The U.S. EPA recommends a maximum concentration of Carbon dioxide CO2 of 1,000 ppm (0.1%) for continuous exposure.

- ASHRAE standard 62-1989 recommends an indoor air ventilation standard of 20 cfm per person of outdoor air, or a CO2 level which is below 1,000ppm.

- NIOSH CO2 exposure limits: NIOSH recommends a maximum concentration of carbon dioxide of 10,000 ppm or 1% (for the workplace, for a 10-hr work shift with a ceiling of 3.0% or 30,000 ppm for any 10-minute period). These are the highest threshold limit value (TLV) and permissible exposure limit (PEL) assigned to any material.

- NIOSH's recommended CO2 exposure limit for 15 minutes is 3.0% or 30,000 ppm .

- A CO2 level of 4% (40,000 ppm) is designated by NIOSH as immediately dangerous to life or health.

-OSHA has set 30,000 ppm of CO2 as a Short-Term Exposure Limit (STEL).

 

[WussRedXLi]

So please do not have multiple pax in a MBR (eg 2 adults, 1-3 kids) and then go weather seal the door seams/gaps with some PU foam from DIY shops during an extended haze period. Read this in some posts in the AP thread earlier.

Some people did not air their rooms for days during Sep/Oct haze periods.

That short opening of door does next to nothing in helping with the CO2 concentrations.

My recommendation earlier was to have an airing session every 8hrs. Maybe now I'd have to shorten to 4-hrs even.

There was an earlier short discussion that since windows allow PM2.5 to "seep in" despite being properly closed, CO2 levels should be ok as it's a gas, so the CO2 molecules being smaller would "seep out even easier"

This doesn't seem to be true in real life.

 

[WussRedXLi]

Hitting 2450ppm CO2 in bedroom after waking up. Aborting test.

Opening the door wide open for 3+ mins (windows still closed) dropped it from 2400ppm range to 1200ppm range.


I have read multiple reviews on Taobao and Amazon on CO2 devices saying that they are getting 2000+ ppm range, 2800ppm....highest is 3500ppm range.