EM21

Wireless Environmental Monitor

Wireless Environmental Monitor

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

List price: $99 plus $60 annual license (all-inclusive license includes maintenance, support, cloud software, and cellular data, if applicable. Volume purchase and multi-year license term discounts available.)

Wirelessly monitors temperature and humidity

With precise sensors and an easy-to-install wireless design, Samsara EM-series monitors are ideal for ensuring food safety during transportation, monitoring warehouse conditions, and other applications that rely on environmental data to ensure quality or maintain compliance.

Durable waterproof design

EM-series monitors are designed for harsh operating environments. IP67-rated weatherproofing protects against splashes, spray, dust, and other environmental wear and tear - ideal for refrigerated trailers and food storage facilities subject to moisture and power-washing. The EM's design is as durable as it is sleek, with exceptional resilience to impact.

Class-leading electronics with multi-year battery life

With the industry's most advanced wireless technology, EMs transmit sensor data in real time to Samsara cellular gateways, enabling operators to see up-to-the-second sensor data over the web and to receive real-time alerts when conditions require their attention. When an EM is deployed out of a gateway's range, it logs data to on-board storage and automatically uploads the data the next time it comes near a gateway. Even with always-on wireless networking and data-logging, the EM runs for three years off of a single AA battery.

Scales from Small Operations to Thousands of Assets

Compact, affordable, and easy to use, Samsara EMs can quickly bring visibility to small operations without IT or engineering complexity. Yet Samsara's scalable cloud infrastructure and enterprise-grade security make the EM an ideal solution for monitoring large-scale operations.

Wireless Environmental Monitor Download Datasheet

Features and Specifications

Sensors

Ambient Temperature
Range: -40° to 60° C (limited by operating range)
Accuracy:-10° to 60° C Typical: ±0.3°, C Max: ±0.4° C  -40° C to -10° C Typical: ±0.7°, C Max: ±0.9° C
Factory-calibrated
Relative Humidity
Range: 0-95% RH
Factory-calibrated

Wireless Connectivity

Wireless connectivity to Samsara GW, VG, and AG-series cellular gateways
Real-time: Delivers new data within seconds
Auto-discovery: Automatically detects and connects to any gateway associated with the same account
Typical range: 100' (line of site). Actual range depends on RF interference and physical obstructions.

Data Logging

Built-in storage logs data when gateway connectivity is unavailable
Storage capacity: 3 month
Data upload: Automatic (zero-touch) wireless data upload via Samsara gateways

Waterproofing

Waterproof and ruggedized for harsh environments
IP67-rated for protection against water and dust
Protected against rain, splashing, and accidental submersion
(Body not intended for prolonged submersion. To monitor fluid temperature, use EM22 with probe.)

Battery

Multi-year battery life
3-5 year battery life
User-replaceable battery (1 standard AA battery)

License

Requires EM license. License includes support, online dashboard access, cloud-hosted data storage, monthly feature updates, and continuous cellular connectivity via Samsara gateway.