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ALTAIR io™ 4 Gas Detection Wearable


Support worker safety and connectivity with the ALTAIR io 4 portable gas detector

The ALTAIR io 4 is a secure, smart gas detector with out-of-the-box connectivity packed into an ultra-rugged design – featuring our XCell sensor platform which continues to lead the industry in lifetime & durability. The ALTAIR io 4 was designed from the ground-up to work seamlessly with the MSA Grid and the ALTAIR io Dock, providing hassle-free compliance, effortless fleet management & incredible visibility into your worker safety that you’ve never had before.

ALTAIR io™ 4 Gas Detection Wearable


ALTAIR io™ 4 Gas Detection Wearable

Tough. Intuitive. Connected.

With fully integrated cellular connectivity right out-of-the-box, the ALTAIR io 4 delivers real-time visibility to help drive safety and productivity across workers, worksites, and workflows.

ALTAIR io 4 features:

  • Available through MSA+, our comprehensive subscription program including hardware and software, gives you access to powerful cloud-based solutions enabling faster implementation, increased warranty coverage and automatic software and firmware upgrades – with minimal capital expense
  • Designed with fully integrated connectivity for real-time visibility across your worksites from Day One
  • CAT-M LTE cellular connectivity and integration with the MSA Grid
  • Deploys in seconds, right out of the box. No IT required
  • Rugged, durable design and Industry-Leading XCell® Sensors
  • Survives a 25-foot drop test. Breakthrough sensor design enables faster response and shorter span calibrations
  • 1 to 4 gas options available. Sensor Options: Combustible (LEL), Oxygen, Carbon Monoxide, Hydrogen Sulfide, Methane, Sulfur Dioxide, Nitrogen Dioxide, H2S Low-Concentration, CO, Hydrogen-Resistant SO2

The ALTAIR io 4 is part of the MSA Connected Work Platform, which helps to simplify safety, curb risk, and boost productivity.



Turnarounds & Plant Maintenance
Emergency Response
Confined Space
Approvals / Standards
FCC and Industry Canada
Class I, Division 1, Groups A, B, C and D T4 -20C to +55C
Class I, Zone 0, AEx da ia IIC Ga T4
Data Logging
Minimum 90-day cloud-synced data logs. Device data synced and stored in customer Grid account.
Oil & Gas
Fire Service
General Industry
Weight: 261 grams (9 oz)
Dimensions: 11.7 x 7.8 x 3.9 cm (4.6 x 3.1 x 1.5 in)
Always under warranty with subscription

Battery & Charging

  • Battery: 2 Ah Rechargeable
  • Charge Time: Typical full charge is 4.5 hours at room temperature
  • Charging Temperature Range: 0°C-40°C*
  • Battery Life: LTE-M: 17 hours typical (LTE-M)*, 2G: 16 hours typical
  • Actual battery run-time will vary depending on factors including cellular coverage, GPS coverage, ambient temperature, usage, active alerts, acknowledgment delay of alerts, location changes, RFID reading, gas readings, device navigation, battery age, and battery cycles.


  • Exceeds 26 drops from 4 feet (1.2 m) (MIL-STD-810G 516.6 Transit Drop)
  • Capable of surviving an incidental 25 foot (7.5 m) drop onto concrete
  • Survives 60 minutes in NFPA 1982-2018 tumble tester
  • Dust and waterproof IP68 rating (2 m for 1 hour)

Location Awareness

  • GNSS: Concurrent GNSS (GPS and GLONASS)
  • GPS Update Frequency: 30 seconds*
  • Location is updated every 30 seconds when a position is acquired. When no position is acquired, the device searches for a location every five minutes to conserve battery life of the device.

GPS Accuracy: 2.5 meters*

  • GPS accuracy will be influenced by surroundings, infrastructure, & environmental conditions


  • RFID Reader: Used by MSA id Tags for digital device assignment & DOCK communication
  • Cellular: LTE-M / 2G Fallback
  • Cellular Carriers: AT&T Global Partner Network, Verizon (USA Only)
  • Bluetooth: v4.1 Bluetooth Low-Energy (BLE)

Sensor Life

Gas Type Typical Sensor Life* Range Resolution
Combustible Catalytic 5 Years 0-100% LEL or Varying Vol % 1% LEL or 0.05 Vol %
O2 Electrochemical 7 Years 0 – 30 Vol % 0.1 Vol %
CO Electrochemical 7 Years 0 – 1,999 ppm 1 ppm
H2S Electrochemical 7 Years 0 – 199 ppm 1 ppm
H2S Low Concentration Electrochemical 7 Years 0 – 99.9 ppm 0.1 ppm
SO2 (Coming Soon) Electrochemical 7 Years 0 – 20 ppm 0.1 ppm
NO2 (Coming Soon) Electrochemical 7 Years 0 – 50 ppm 0.1 ppm
CO – Hydrogen Resistant Electrochemical 7 Years 0 – 1,999 ppm 1 ppm
* Typical sensor life can vary due to environmental conditions and / or combustible sensor poisoning


Confined Space Solutions

MSA Connected Work Platform

MSA+ AutoFill for Calibration Gas 

ALTAIR io 4 Gas Detection Wearable Standards Compliance Certifications