Samsara HW-IG21 Industrial IoT Gateway

Samsara next-generation industrial gateway with cellular and Wi-Fi connectivity
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Samsara's IG Series Industrial Controllers provide a modern platform that combines data collection, control, alerts, and analytics in an easy to deploy and easy to use system—from the plant floor to remote sites. Managed by Samsara's secure cloud dashboard, the IG Series combines the capabilities of a programmable logic controller (PLC) or remote terminal unit (RTU) with a 4G LTE cellular gateway into a single device designed to meet the harsh demands of water/wastewater, oil and gas, and industrial environments.

Faster, Easier, and Cheaper to Deploy

Integrated platform means that whether you are connecting critical equipment on the shop floor, or hundreds of remote locations, simply connect your IOs and gain immediate visibility on your browser or mobile device. No servers to set up, no software to manage, no complexity.

Operational Data at Your Fingertips

View critical data in Samsara's cloud dashboard, easily export to analytics tool of your choice, or directly integrate with your existing historian through modern API functionality. Samsara makes getting your data easy, and lets you manipulate it to get the most out of it.

Real-Time Visibility and Alerts

Samsara's cloud dashboard acts as historian and HMI to provide immediate visibility into real time and historical data, and allows for simple, easy to manage alerts. Cloud infrastructure allows infinite scalability without any infrastructure investment, and on-device storage means data is captured even if network connection is down.

Easily View and Deploy Program Code

Modern IEC 61131-3 programming environment allows engineers to reuse code and audit program execution—all without going onsite. Samsara's central visibility dramatically increases the speed at which industry standard IEC 6113103 programs can be written and deployed across any number of locations.

Designed for Modern Data Security

Unlike legacy solutions that were designed in a different era and patched over time, Samsara is purpose-built to aggregate and process sensor data securely. Cyber threats continuously evolve—your industrial IoT architecture should as well. Samsara's architecture ensures always up-to-date cloud software and seamless over-the-air firmware patches for on-premise devices.

Internet Connectivity


  • WiFi 802.11 b/g/n

Data Security

  • All Internet connectivity secured via SSL with 256-bit AES encryption (the encryption standard for sensitive data including military and financial applications)

Data Transmission and Storage

Real-time connectivity

  • Streams sensor data to the Samsara Cloud in real time

Built-in Storage for Offline Logging

  • Sensor data stored in built-in flash memory when Internet connectivity is unavailable

Digital and Analog Inputs/Outputs

Analog Inputs

  • 4, Isolated channels with 0-12 V or 0-24 mA
  • Resolution: 14-bit ADC
  • Accuracy: 0.1% FSR at 25°C
  • ESD/EFT/Surge protected
  • Input Resistance @ 24 mA: 300 ohm

Analog Outputs

  • 2, Isolated channels with 0-12 V or 0-24 mA
  • Resolution: 16-bit
  • Accuracy up to ± 0.2% FSR at 25°C
  • ESD/EFT/Surge protected
  • Settling Time: 5 us
  • Load Range: 1000 ohm (12 V) - 600 ohm (20 mA)

Digital Inputs/Outputs

  • 6, user-configurable as inputs or outputs (open-drain)
  • ESD/EFT/Surge protected
  • As Input: Dry-contact (internally sourced 3.3 V @ 1 mA)
  • As Input: Wet-contact (0 V–30 V)
  • As Output: Sinking MOSFET output, rated 30 V, 0.5 A

Counter Inputs

  • 2, Counter Input (0 V–30 V)
  • Up to 10 Hz (dry-contact)
  • Up to 10 kHz (wet-contact)


Serial Port

  • RS485: Up to 20 Mbps, 2-wire, half-duplex
  • RS232: Up to 1 Mbps, 2-wire, full or half-duplex
  • (ESD Protected)

Serial Protocols

  • Modbus slave/master


  • 8-pin modular RJ45 jack, 10/100 Mbps (10/100 Base-T)
  • Transformer-isolated

USB Host

  • USB 2.0 compatible A-type receptacle



  • 180 mm × 118 mm × 32 mm (7.09 in × 4.65 in × 1.26 in)


  • 725 g

Hazardous Locations

  • Certified for Class I, Division 2, Groups A, B, C, D

More Information
Model Number HW-IG21
Brand Samsara
Dimensions 180 mm × 118 mm × 32 mm
Verticals Industrial IoT
Product Type Industrial Gateway
Technology Multiple
Sensor Type Gateway
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