EM21 and EM22 Sensor Basics

Samsara Environmental Monitoring (EM21 and EM22) Sensors continuously measure environmental conditions and the data is instantly available in the Samsara Dashboard.

The EM21 is a wireless, waterproof, data logging environmental monitor with temperature and humidity sensors.

The EM22 adds an external temperature probe, which is to measure temperature in liquids and extremely hot and cold environments.

The EM21 and EM22 sensors have the following basic features:

  • Continuous data upload to the cloud and Samsara Dashboard
  • IP67 waterproof and dustproof
  • Small, light-weight, ruggedized design
  • 3-5 year battery life
  • 100ft (30m) wireless range, depending on conditions
  • 90 days backup data storage

See KB articles for the various models to see specific information, or view the Data Sheets here: https://www.samsara.com/docs