Sensors
Troubleshooting This category provides a selection of articles and topics to assist users with troubleshooting problems associated with setting up, maintaining, and using PurpleAir sensors.
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Sensor Owner's Guide
Introduction Welcome to PurpleAir! By purchasing a sensor, you have joined a worldwide network of people striving to better understand their air. You can now contribute to that network by setting up your device. Doing … |
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8 | 5748 | August 18, 2025 |
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About PurpleAir Sensors
This category serves as a knowledge base for information regarding PurpleAir sensors and other hardware. Here you can find information about setting up your sensor, troubleshooting, and other related topics. If you have … |
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4 | 1882 | January 24, 2025 |
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Sensor WiFi and Registration
This guide will help you set up your PurpleAir sensor. To set up this device, you will need the sensor’s device ID, an email associated with the sensor, a local WiFi network, and a WiFi-enabled device like a phone or c… |
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14 | 198029 | November 6, 2023 |
| Which Sensor to Choose |
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18 | 77349 | November 6, 2025 |
| Spurious spike on indoor sensor |
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3 | 33 | October 31, 2025 |
| No reading indoors |
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3 | 45 | October 23, 2025 |
| How to reset downgraded sensor channel? |
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12 | 328 | October 23, 2025 |
| Restarting after unplugging |
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4 | 437 | October 22, 2025 |
| Flex-2 isn't correlating well with my state's FEM monitor |
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4 | 43 | October 22, 2025 |
| Que puedo hacer si perdi mi correo de asociacion? |
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1 | 7 | October 22, 2025 |
| Averaging Time for LED Colors |
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1 | 70 | October 22, 2025 |
| Outdoor PA-II-Zen 7.04.- intranet webpage disappears, requires power cycling |
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1 | 70 | October 22, 2025 |
| LED color is cool but flashing is super distracting |
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1 | 61 | October 16, 2025 |
| How to Flash Firmware to Your Sensor |
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0 | 679 | August 22, 2024 |
| Find operator of sensor? |
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1 | 22 | October 2, 2025 |
| VOC sensor measurements? |
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3 | 68 | September 29, 2025 |
| Replace USB adapter |
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2 | 31 | September 26, 2025 |
| Not so sure these reflect actual air qual |
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3 | 100 | September 26, 2025 |
| Device ID (MAC address) is missing one character? |
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5 | 70 | September 26, 2025 |
| Sensor glows red but map shows green |
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1 | 14 | September 26, 2025 |
| What Do PurpleAir Sensors Measure and How Do They Work? |
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2 | 12458 | September 26, 2025 |
| 5 GHz Sensor? |
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2 | 28 | September 19, 2025 |
| Sensor malfunction |
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11 | 1138 | September 15, 2025 |
| Rename sensor |
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3 | 145 | September 11, 2025 |
| Can not access capture wifi config page |
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0 | 19 | September 3, 2025 |
| SD Card data is missing when PA Flex is used outside |
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6 | 141 | August 23, 2025 |
| How to Get Sensor Indexes and Locations in a Region |
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1 | 41 | August 21, 2025 |
| Ozone VOC NO2 |
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3 | 60 | August 18, 2025 |
| Single high PM point measured in one channel |
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2 | 32 | August 18, 2025 |
| Clock accuracy |
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0 | 19 | August 13, 2025 |