Decoding RS232 on the scope and fixing a Temtop M2000C that's stuck on "Sensor preheating"
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- Опубліковано 6 вер 2024
- 3-yr old Temtop M2000C Air Quality Monitor just says ""Sensor preheating" when you try to monitor CO2. I use a Rigol oscilloscope to decode the RS232 and troubleshoot the issue. The fix ends up being really simple, but it's not obvious.
The battery:
amzn.to/3vz51Uv
The scope:
amzn.to/3G8xBRw
The Air Quality Monitor:
amzn.to/2Z8LSgi
EDIT: I DID need to recalibrate mine, but it's easy. Wait for the pre-heating to finish, go into the mode that displays just the C02 ppm, hit the menu button, and select "Calibration zero". Follow the directions on-screen, but you basically just put it outside for a set time.
Thank you! Glad there are still guys like you who try to investigate and fix rather than throw in the trash and buy a new one.
Glad you found this. I hope the 23 thumbs up I see on the vid overall means 23 of these saved from the trash.
Ha! Thanks! Mine was stuck on preheating, thought it was perhaps the battery, so plugged it in to charge. Saw it added a COM port. Started googling for if anything supports that protocol and low and behold, your video with the fix.
glad to hear it worked for you. . it's such a shame they engineered these this way. It's painful to think of all the ones that probably already went in the trash.
Thank you for your efforts and video. It was so helpful. I like you liked the instrument but was ready to order another one since the CO2 meter would not go by the preheating function and give me a reading. I think I will be able to fix my device. Thanks again.
Great look into it and thank you. Just took mine apart and ordered a battery.
Glad it helped
Saved my Temtop m2000! Thanks
Thanks for the instructions!
You bet!
Great video. Turned mine on today and the sensor was stuck on preheating. The date on the back of the unit is 3.23.20 - so about 3 years old. I will be replacing the battery. Thanks for saving me some money :).
Update: Well I installed a new battery, tested it and it worked. Set the date and time and took it outside to calibrate and it still worked when I brought it back in. Put the back cover back on and it was back to permanent pre-heating. Opened it back up and put in another new battery and it still would not work. Not sure what went wrong. I was pretty careful, but oh well. I just received my well-rated new standalone detector with long-lasting (supposedly) replaceable batteries. I still enjoyed your video and was happy your solution worked even if success was short lived.
Thank you! This was extremely helpful!
thx!
thank you, this video saved me money! thanks again!
Thank you for the Help ! Great video
This was a huge help, thank you. Saw your Amazon review and loved the deep dive you did on this video. Replaced my battery and problem fixed! I would not have figured that one out. Much appreciated! Well done
Thanks for taking the time to comment. Really glad you were able to fix yours as well.
Problemd fixed because of your video, thanks so much!
So glad you were able to resolve. Thanks for sharing. Makes it 100% worth the work/upload to know these are getting fixed and living on vs. adding to the landfill.
Thanks! Do you have any idea if the advertised 3 year lifespan is just because of that battery or either of the sensors actually degrade over time?
Thanks, I do not know for sure, but I believe it is due to the battery. I will say that my new units reads within the error range of the states accuracy of my old one now that the battery has been replaced and I re-calibrated it.
Thank you!!!!!
Thx for letting me know this helped! Amazon removed my review (maybe because I was pointing ppl to youtube?), so I hope folks continue to find this from the search. Pains me to think of these going in the garbage when it's such a simple fix.
Thank you so much! My meter died over a year ago, but it looks like I will finally be able to bring it back. Speaking of the unit, is it just me, or is the formaldehyde sensor attached shockingly bad? Mine appears to be just flapping in the wind on two blobs of solder and possibly tearing the traces on the PCB. I even needed to bend it out of the way to get to a screw. Some hot glue will be applied soon.
Mine does not have that sensor
Saw the Amazon review, great video. Any idea on the calibration functionality? I wasn't sure if this would calibrate to 0 or to some other known value.
I DID need to recalibrate mine, but it's easy. Wait for the pre-heating to finish, go into the mode that displays just the C02 ppm, hit the menu button, and select "Calibration zero". Follow the directions on-screen, but you basically just put it outside for a set time.