WHY the data of MHZ19B 200ppm less than Senseair s8 0053

Moderators: grovkillen, Stuntteam, TD-er

Post Reply
Message
Author
halli
Normal user
Posts: 2
Joined: 14 Dec 2018, 03:15

WHY the data of MHZ19B 200ppm less than Senseair s8 0053

#1 Post by halli » 14 Dec 2018, 03:29

hello,everyone,I am a freshman of EASYESP.
I buy MHZ19B and Senseair s8 0053,connet them to two ESP8266 nodemcu,which firmware is ESP_Easy_mega-20181125_normal_ESP8266_4096.bin
Disable the ABC for MHZ19B, and calibration it manually(Reference to official documents)。
But the data from the two sensor is Big difference,please see the attachment png。
I test serval days ,the result is the same, WHY? which one is Inaccurate? how to finger out ?
Attachments
20181214102657.png
20181214102657.png (42.26 KiB) Viewed 799 times

User avatar
grovkillen
Core team member
Posts: 3332
Joined: 19 Jan 2017, 12:56
Location: Hudiksvall, Sweden
Contact:

Re: WHY the data of MHZ19B 200ppm less than Senseair s8 0053

#2 Post by grovkillen » 14 Dec 2018, 06:12

How long have they been running? The ABC inside the S8 is 8 days but it will not do a 200ppm adjustment in one period, it probably need two cycles. But if the S8 has been running for 3 weeks or more I'd say that the S8 is the correct one.


PS. I work at Senseair (2 days a week) and if you PM me the serial number of the S8 I could see what calibration had been done at factory. If the sensor is miss-behaving I could hook you up with a test sensor for further reference.
ESP Easy Flasher [flash tool and wifi setup at flash time]
ESP Easy Webdumper [easy screendumping of your units]
ESP Easy Netscan [find units]
Official shop: https://firstbyte.shop/
Sponsor ESP Easy, we need you :idea: :idea: :idea:

halli
Normal user
Posts: 2
Joined: 14 Dec 2018, 03:15

Re: WHY the data of MHZ19B 200ppm less than Senseair s8 0053

#3 Post by halli » 17 Dec 2018, 04:30

Thx,my s8 just run about one week,so,I will continue monitoring it for a while.
but i am sure that s8 is not correct,because I put it in Outdoor environment for a while ,it's Minimum readings is 460PPM,I think it should be about 400ppm

User avatar
grovkillen
Core team member
Posts: 3332
Joined: 19 Jan 2017, 12:56
Location: Hudiksvall, Sweden
Contact:

Re: WHY the data of MHZ19B 200ppm less than Senseair s8 0053

#4 Post by grovkillen » 17 Dec 2018, 06:07

Then I'd suspect there ABC will take care of the S8. But if the S8 is reporting 460 ppm for the outdoors I would suspect the MH-Z19 be incorrect also? I.e. measuring too low?
ESP Easy Flasher [flash tool and wifi setup at flash time]
ESP Easy Webdumper [easy screendumping of your units]
ESP Easy Netscan [find units]
Official shop: https://firstbyte.shop/
Sponsor ESP Easy, we need you :idea: :idea: :idea:

rickitaly
Normal user
Posts: 1
Joined: 01 Dec 2019, 12:19

Re: WHY the data of MHZ19B 200ppm less than Senseair s8 0053

#5 Post by rickitaly » 01 Dec 2019, 12:23

Hello, i just purchased a Senseair S8 and connected to Wemos D1 mini to give me CO2 data with ESPEasy.
First of all i put it outside to check proper values, and here is what i get:
co2.PNG
co2.PNG (29.41 KiB) Viewed 110 times
How can it be correct? Never less than 500!
Please do not consider the spike, i rebooted and tried to change the Wemos to another one.
Thanks!

User avatar
grovkillen
Core team member
Posts: 3332
Joined: 19 Jan 2017, 12:56
Location: Hudiksvall, Sweden
Contact:

Re: WHY the data of MHZ19B 200ppm less than Senseair s8 0053

#6 Post by grovkillen » 01 Dec 2019, 12:57

Did you buy it from me?
ESP Easy Flasher [flash tool and wifi setup at flash time]
ESP Easy Webdumper [easy screendumping of your units]
ESP Easy Netscan [find units]
Official shop: https://firstbyte.shop/
Sponsor ESP Easy, we need you :idea: :idea: :idea:

TD-er
Core team member
Posts: 1946
Joined: 01 Sep 2017, 22:13
Location: the Netherlands
Contact:

Re: WHY the data of MHZ19B 200ppm less than Senseair s8 0053

#7 Post by TD-er » 01 Dec 2019, 13:22

grovkillen wrote:
01 Dec 2019, 12:57
Did you buy it from me?
Made a typo in your (re)calibration lab? ;)

User avatar
grovkillen
Core team member
Posts: 3332
Joined: 19 Jan 2017, 12:56
Location: Hudiksvall, Sweden
Contact:

Re: WHY the data of MHZ19B 200ppm less than Senseair s8 0053

#8 Post by grovkillen » 01 Dec 2019, 18:06

I hope not! :o
ESP Easy Flasher [flash tool and wifi setup at flash time]
ESP Easy Webdumper [easy screendumping of your units]
ESP Easy Netscan [find units]
Official shop: https://firstbyte.shop/
Sponsor ESP Easy, we need you :idea: :idea: :idea:

Post Reply

Who is online

Users browsing this forum: No registered users and 12 guests