how do i get some help that my sensor channel b is terrible ?
Hi there,
Thanks for the post! I’ve taken a look at your sensor, and I can see what you’re saying about channel B reporting erroneous readings. This issue can occur due to an obstruction in the unit, such as a spider web, an insect, or some debris. You can typically resolve it by following the steps in our sensor maintenance guide to clear it out.
Let us know if you need any additional guidance with this!
Hi @helldoodle
I have had a look at your sensor on the PurpleAir Map and I have a few more options for you to try to fix the issues that you are encountering, that is, if the advice provided by @ShawnBoyle about cleaning the laser counters didn’t fix the issues that you are encountering.
- The Input Voltage that the sensor is receiving appears to be only 0.1V. Low input voltage is an issue with PurpleAir sensors because the sensor uses a laser to detect particles and if there is not enough power the laser is not as bright as it should be which makes the sensor think that there is lots of pollution when there isn’t. This low voltage may be caused by an issue with your power adapter or cable. Check is the adapter is rated with an output voltage of 5V 2A as this is the power requirement of a PurpleAir sensor. If your adapter meets these requirements, try using a different cable and adapter to see if the sensor behaves the same as when you were using the original cable or adapter. If the sensor behaves differently, it is likely that the original cable is faulty. I would say that this is likely as the sensor is showing that the Temp, Humidity & Pressure sensor is not reporting (likely caused by being loose or not receiving enough power) nor is the SD card registering (you may want to investigate this further if you use an SD card, if not, it’s not an issue).
- I can see that the sensor is registered as indoor. If this is correct (I only say this because lots of sensors that say they are indoors actually are mislabelled), you could find that there is an indoor factor that may be causing these spikes. I find that often an indoor fireplace or cooktop can sometimes cause these spikes. I would say this is less likely than the first option as channel A & B only sometimes agree on the reading.
- If all else fails, I suggest unplugging the device, and checking that no spiders (or bugs) have got inside the circuit boards (not the laser counters) as a dead spider (or bug) can cause a short circuit because they are conductive.
I operate a few sensors in a similar climate to you, so these are just the things that I have found can be the cause of issues.
Hope this helps, let me know if you have any questions about what I have suggested 
Have a great day!
ah i will play around with a diffrent POE setup
Let me know how it goes It’ll be interesting to find out if I’m the only one who has the issue with the voltage or not.