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  • Response and clear times less than 15 seconds
  • 4-year sensor life, 60% longer than the industry average
  • Two-tox CO/H2S sensor
    • Removes practically all cross-channel interference
  • Large buttons & high-contrast screen
  • Unit features 95+ db alarm and ultra-bright LEDs
  • End-of-sensor warning cautions user to change sensor
  • MotionAlert option tells others that user is immobile
  • InstantAlert manual alarm to alert others of danger
  • GALAXY GX2 System compatible
  • Approval agency certified IP67 Rating
  • 60-second span calibration time
  • MSA Link Pro and MSA Link Software-ready
  • Rugged polycarbonate housing, 20ft drop tested
  • Kit options are available

What's in the Box

  • Quick-start card
  • Charger
  • Calibration cap and tubing
  • CD manual

The MSA ALTAIR 4X is an extremely durable multigas detector that simultaneously measures up to four gases while providing an additional layer of safety with MSA's MotionAlert and InstantAlert features. This advanced, versatile portable detector is a perfect match for industries ranging from firefighting to welding and everything in between.

The MSA ALTAIR 4X is compatible with a wide range of XCell sensor options including combustible gases, O₂, CO, H₂S, SO₂ and NO₂. XCell sensors surpass industry standards in several crucial areas. Their four-year sensor life is double the industry average, and they are engineered using MSA's proprietary application-specific integrated circuit (ASIC) design. By miniaturizing sensor controlling electronics and placing them inside the sensor itself, MSA XCell Sensors offer superior stability, accuracy and repeatability.

MSA XCell Sensors are a breakthrough in chemical and mechanical sensor design, enabling faster response and span calibration times. With less time spent on calibration and bump tests, you save calibration gas, maintenance costs and in turn, save money. But most importantly, in your industry, saving seconds on response time can also mean saving lives.

Exclusive safety features like MotionAlert and InstantAlert make the ALTAIR 4X Multigas Detector ideal for applications like confined space entry. The MotionAlert sensor activates when a user becomes disabled and motionless, quickly alerting others to the disabled user's location. And with a simple push of a button, the InstantAlert feature enables users to manually alert others to potentially hazardous situations.

The ALTAIR 4X Multigas Detector is as tough and functional as it looks. A rugged housing provides unsurpassed durability, including the ability to survive a 20-foot drop. And with large, glove-friendly buttons and a high-contrast display, the ALTAIR 4X Multigas Detector is easy to operate in any work environment, even low-light conditions


MSA GALAXY GX2 Test System
Automated Test System provides simple, intelligent testing and calibration of MSA ALTAIR series gas detectors
MSA Calibration Testing Gas
Certified gas mixtures for calibrating MSA gas detectors
MSA Regulators
Regulators for use with calibration gases
In Stock
MSA Calibration Tubing
Calibration tubing with quick-disconnect fitting


MSA Link Software
Software package for MSA gas detectors accommodates data logging and a host of other options


MSA XCell Gas Sensors
Replacement XCell sensors enable faster response and shorter span calibrations, saving you time and money


Please consider these optional accessories.

MSA Sample Probes
1- or 3-foot sample probes allow pinpoint placement into hard-to-reach areas
MSA Sampling Lines
Lengths of sampling lines to connect a sampling probe to your MSA gas detector
MSA Shoulder Strap
Shoulder strap for MSA gas detectors
Rugged sampling probe capable of drawing samples from up to 50ft away allowing diffusion instruments to be used in remote sampling applications