I bought a new 2025 Plantower PMS5003 that is fairly consistent with 2 others purchased about 4 years ago except the <0.3μm bin is off by a factor of 3.
You reported some variations over the past years, with the most recent update Oct/2024. Have you seen any issues with the 20250408 or later batches?
Hi Jay,
We have not observed any issues with more recent batches. Although, it is possible that your previous counters are part of the batch that did have issues. Were the previous laser counters received as part of a sensor purchase?
They were also purchased independently. They’re 20201228. I’m guessing the new one is defective.
Jay,
As a follow-up to this, we’d be happy to take a look at your sensor readings if this is still a concern. You can send the sensor’s device ID to contact@purpleair.com, and we’ll offer our analysis and support in determining what might be going on. If you’d prefer to do so, you can share some information in this thread for us to take a look.
Please note that if your laser counters weren’t purchased from us, we can’t guarantee their quality through our in-house testing process.