Samsara EM-series sensors are ideal for monitoring food safety during transportation, warehouse conditions, and other applications that rely on environmental data to ensure quality or maintain compliance.
Warning
Samsara EM sensors are not intended to be used as a primary method of detecting fires or monitoring life threatening conditions.
The Samsara temperature monitors use thermistor-based temperature sensors to monitor the temperature without the need for periodic recalibration. After sampling the environment, the sensor delivers the new data to the Sensor Environment Report.
The table below summarizes the EM features by model:
|
EM Model |
Feature Description |
|---|---|
|
EM31 |
A wireless, waterproof, data logging temperature sensor. For a wider range of temperature applications, connect an ACC-EM-P1 accessory probe. The EM31 sensor uses a Sensylink CT7117 sensor which is factory calibrated and tested in a controlled environment. For more information, see the Certificate of Calibration which certifies each Samsara EM sensor has been calibrated to read temperature according to the specifications noted in the EM31 datasheet. |
|
EM21 and EM22 |
The EM21 and EM22 are wireless, waterproof, data logging environmental monitors with temperature and humidity sensors. The EM21 and EM22 sensors use a Silicon Labs 7013 module which is factory calibrated and tested in a controlled environment. For more information, see the Certificate of Calibration which certifies each Samsara EM sensor has been calibrated to read temperature and humidity according to the specifications noted in the EM21 and EM22 datasheet. |
Before you can begin using your EMs, Install an Environmental Monitor Sensor, then pair your sensor to start monitoring conditions from your Samsara dashboard.
Samsara supports different models of Environmental Monitor (EM) sensors to ensure quality and maintain compliance for various applications that rely on environmental data, such as food safety during transportation. To install an EM Sensor, follow the instructions for your model:
To install an EM31 sensor, follow the detailed workflow below or for printable installation instructions, see the EM31 Install Guide.
To install an EM31 sensor, you will need:
-
Identify a mounting location within 100 feet of your gateway.
To ensure accurate ambient and probe temperature, we recommend the following placement suggestions:
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Ambient temperature: Place the device in a location with open airflow and away from doors to avoid large temperature fluctuations. Ensure the rubber plug on the bottom of the device remains inserted when the temperature probe is not in use.
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Probe temperature: Ensure four inches below the device is free of obstructions to allow for cable connection.
Note
The probe is sold separately.
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-
Mount the device using the attached adhesive strips onto a clean, flat surface.
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Secure the sensor using the provided screws.
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If applicable, install the probe.
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Remove the rubber plug at the bottom of the device.
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Insert the connector with the grips facing forward.
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Fasten the connector with the screws.
An "EXT" external temperature reading will appear on the screen.
Note
Both ambient temperature and probe temperature will be displayed in the Samsara dashboard
-
-
Verify that the sensor is reporting the temperature from the Samsara dashboard.
To install an EM21 or EM22 sensor, follow the detailed workflow below or for printable installation instructions, see the EM21 Install Guide.
To install an EM21 or EM22 sensor, you will need:
-
Identify a mounting location within 100 feet of your gateway.
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Secure the mounting plate of the sensor using the provided screws.
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Secure the sensor cover to the mounting plate and fasten with the top screw.
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Verify that the sensor is reporting the temperature from the Samsara dashboard.
If you need to troubleshoot your Environmental Monitor sensor, refer to the following steps for your observed behavior.
|
Issue Observed |
Troubleshooting Steps |
|---|---|
|
EM31 Sensor Troubleshooting |
|
|
Screen is blank due to low battery. |
|
|
EM31 isn't reporting humidity. |
This is expected as the EM31 does not have a humidity sensor. |
|
No connection bars are showing in the upper right corner of the sensor. |
|
|
The report displays the wrong units (Celsius or Fahrenheit). |
The units displayed on the sensor are based on the locale of the dashboard the sensor belongs to.
|
|
EM21 and EM22 Sensor Troubleshooting |
|
|
No temperature data is showing on the dashboard. |
|
|
Humidity is reading at 100%. |
Contact Support. |
|
There is no display on the EM. |
|
For printable installation instructions, see the Environmental Monitor Install Guide.
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