---
title: Media Cartridge Installation Guide
description: Learn how to safely remove and replace the APS-400 media cartridge, update cartridge status in the Particle Sense app, and restore sampling
---

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# Media Cartridge Installation Guide

### Removing and Replacing Media Cartridge

### **Important Notice:**

### After replacing the media cartridge, open the Particle Sense app and navigate to the sensor’s page. Once there, press “Replace Sampling Media” and select the condition of the cartridge. If you are installing a partially used media cartridge follow the [Installing a Partially Used Media Cartridge](https://pollensense.atlassian.net/wiki/spaces/PSS/pages/473956353/Installing+a+Partially+Used+Media+Cartridge?atlOrigin=eyJpIjoiMzAxZmZjMzE3MzcyNDg5OThjOWM3Y2I5NjJkYjdiNjQiLCJwIjoiYyJ9) instructions.

![Replace Sampling Media](https://support.pollensense.com/hs-fs/hubfs/Replace%20Sampling%20Media.jpg?width=670&height=814&name=Replace%20Sampling%20Media.jpg)

### If you notice that your sensor has not began sampling again after swapping the media cartridge (i.e. the fan is not running once you close the lid), remove the sensor from power and plug it back in. This will reboot the sensor and have it begin the sampling service again.

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