Amazon Monitron is no longer open to new customers. Existing customers can continue to use the service as normal. For capabilities similar to Amazon Monitron, see our [blog post](https://aws.amazon.com/blogs/machine-learning/maintain-access-and-consider-alternatives-for-amazon-monitron).

# Step 4: Pairing Sensors to an Asset
<a name="gs-adding-sensors"></a>

Each sensor that you pair to an asset has a designated position and is set to monitor a specific part of the asset. For example, a sensor set up to monitor bearings on a conveyor belt might have the position of Left bearing 1 with a position type of Bearing. 

Amazon Monitron uses Near Field Communications (NFC), a short-range (4 cm or less) wireless technology for communication between two electronic devices. To use Amazon Monitron, you need an iOS or Android 8.0\$1 smartphone with NFC installed natively. 

**Important**  
The equipment that you want to monitor must be in a healthy state before you pair it to a sensor. Amazon Monitron must establish a baseline for the equipment based on its normal state so that it can later determine abnormalities.

**To pair a sensor with an asset**

1. Attach your sensor in the correct position, as described in [Step 3: Attach Sensors](gsg-sensors.md). You can also attach the sensor after pairing it to the asset in this step 4. 

1. Make sure that the NFC feature on your smartphone is on and functioning.

1. Open your Amazon Monitron mobile app, and select the **Project** you want to add the sensors to.

1. From the navigation menu, make sure you're in the correct **Site**, and then choose **Assets**.

1. From the **Assets** list, choose the asset that you just created.

1. On your **Asset** page, choose **Add position**. 

1. On the **Add position** page, do the following:

   1. For **Name**, add a name for your position.

   1. For **Type**, choose the **Type of position** that best fits the location that you're going to monitor: 
      + Bearing
      + Compressor
      + Fan
      + Gearbox
      + Motor
      + Pump
      + Other
**Note**  
After you pair the sensor, you can't change the position type. 

   1. For **Class**, choose the machine class of the asset from the four available.
**Note**  
Asset machine class is based on ISO 20816 Standards. Amazon Monitron administrators can also create custom machine asset classes for all positions within a project. For more information about machine classes and customizing them, see [Assets](https://docs.aws.amazon.com/Monitron/latest/user-guide/assets-chapter.html).  
![\[Form for adding an asset with fields for asset name and machine class selection.\]](http://docs.aws.amazon.com/Monitron/latest/user-guide/images/add_asset1.png)

1. Choose **Next**. You'll be prompted to add sensors. For information on how to add sensors, see [Sensors](https://docs.aws.amazon.com/Monitron/latest/user-guide/as-sensor-positions1.html).

1. Choose **Pair sensor**. 

1. Hold your phone close to the sensor to register it. A progress bar shows when registration is complete.   
![\[Hand holding a smartphone near a small orange square, likely representing a sensor.\]](http://docs.aws.amazon.com/Monitron/latest/user-guide/images/gs-sensor.png)

   It can take a few moments for the sensor to be commissioned. If you have trouble pairing the sensor, see [Pairing Your Sensor](https://docs.aws.amazon.com/Monitron/latest/user-guide/as-sensor-positions1.html#as-add-sensors) for more information.
**Tip**  
If your smartphone fails to detect the sensor, try holding it so that the NFC antenna is close to the sensor. For iPhone models, the antenna is located at the top edge of the device. For Android models, the antenna location varies. The following resources might help you locate the NFC antenna on an Android device:  
[NFC detection area (Samsung)](https://www.samsung.com/hk_en/nfc-support/#devicelist)
[Pixel phone hardware diagram](https://support.google.com/pixelphone/answer/7157629)

On the **Assets** page, the sensor is now paired to the asset and is identified by its position.