Analog Current-Sensing Input Module, 4-20mA

The IM31 is a wireless, self-powered input module with 2x analog inputs for 4-20mA current loop sensors.

List price: $99 plus $5/mo license (includes maintenance, support, and cloud software.)

Brings industrial sensor data into the cloud

The Samsara IM31 supports the ubiquitous 4-20mA current loop protocol, connecting thousands of third party sensors into the Samsara platform. Connect IMs to flow meters, pressure transducers, gas level sensor, temperature sensors, tank sensors, airflow sensors, and more. The Samsara IM family brings wireless connectivity, real-time remote visibility, and the power of the cloud to virtually any environment.

Easy to Deploy

Samsara input modules are all-wireless and self-powered, enabling deployment without complex engineering or integration. Deploy IMs in new facilities, or use IMs to bring remote visibility to existing industrial sensors. The IM family can be deployed standalone or alongside a PLC.

Power of the Cloud

Samsara input modules bring modern cloud capabilities to traditional sensors, from centralized visibility to interactive graphs, real-time alerts, and mobile apps. A scalable cloud system spans projects from a single site to thousands of endpoints.

1/10th the Cost

When combined with Samsara IoT gateways, the IM family brings remote connectivity to industrial sensors at 1/10th the cost of traditional SCADA infrastructure: Samsara eliminates the need for proprietary networks, databases, historians, and complex engineering and implementation.

Designed for Security

Samsara input modules are designed for use in security-conscious environments. IMs are read-only. The entire Samsara system is isolated from control systems, even when input modules are deployed alongside PLCs. Enterprise-grade encryption and robust security tools provide best-in-class data security.

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Features and Specifications

Analog Inputs

Current Loop Inputs

2 x analog DC current-sensing inputs
Range: 4-20mA (full scale 0 - 20.48 mA)
Resolution: 12 bit
Voltage drop: 2V (max)

Wireless Connectivity

Wireless connectivity to Samsara GW and GV series 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) to 25' (dense industrial environment). Actual range depends on RF interference, building materials, and physical obstacles.

Data Logging

Built-in storage logs data when gateway connectivity is unavailable

Storage capacity: 1 month
Data upload: Automatic (zero-touch) wireless data upload via Samsara gateways


3 year battery life


Requires IM license (list price $5/mo). License includes maintenance and support, full online dashboard access, mobile app access, unlimited sensor data storage, monthly feature updates, and continuous cellular connectivity via Samsara gateway. Automatic discounts available with extended license term.