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MSA Altair 4 Multi-Gas Detector

This product is now obsolete and has been replaced by the Altair 4x Multigas Detector.

The ALTAIR 4 is a reliable multi-gas detector that measures O2, H2S, CO and combustible gas. Besides being one of the most compact multi-gas detectors available, it has an extremly durable rubberized housing and is very easy to use.

The ALTAIR 4 is available with the option of MotionAlert - a unique feature in the world of portable gas detection. The detector's alarm is triggered if the user remains motionless, alerting those nearby. The InstantAlert alarm allows the user to manually activate the detector's alarm system. It is a standard feature across the ALTAIR 4 range.

  MotionAlert & InstantAlert alarm features for additional safety
  IP 67 and designed to pass 3m droptest
  Triple Alarm System: super-bright LEDs on the detector's top and bottom, audible alarm of 95 dB at 30 cm and strong vibrating alarm as a standard.
  Large rubberized buttons for easy operation
  16-hour battery run time
  Simple bump check with checkmark for 24 hours
  Easy to read display
  Robust, easy to grip design
  Durable suspension clip
  MSA Link ready


  Combustible Atmosphere
  Oxygen Deficiency
  Toxic Atmosphere (IDLH)
  Toxic Atmosphere (Non-IDLH)

Approvals & Standards


ATEX II 2 G EEx ia d IIC T4, Tamb = -20 °C to +50 °C

USA & Canada:

UL, Class I, Div. 1, Groups A B, C, D, Class II, Div. 1 Groups F & G. T4, Tamb = -20 °C to +50 °C CSA, Class I, Div. 1, Groups A B, C, D

Australia & New Zealand:

IEC Ex ia d I/IIC T4, ANZEx ia s I/IIC T4 [Zone 0]


  CO-monitoring in iron and steel production
  Fire Fighting
  Food Processes
  Foundries & Metal Production
  Hazardous material storage
  Hazardous Materials
  Oil & Gas
  Paper & Pulp
  Waste & Water Treatment

Ordering Codes

10092018 - ALTAIR 4 Met [LEL 5.0% Vol]-O2-CO-H2S with MotionAlert
10092020 - ALTAIR 4 Met [LEL 5.0% Vol]-O2-CO-H2S
10092071 - ALTAIR 4 Met [LEL 4.4% Vol]-O2-CO-H2S with MotionAlert
10092019 - ALTAIR 4 Met [LEL 4.4% Vol]-O2-CO-H2S
10092072 - ALTAIR 4 Met [LEL 4.4% Vol]-O2-CO-H2S [mg/m3] with MotionAlert
10092073 - ALTAIR 4 Met [LEL 4.4% Vol]-O2-CO-H2S [mg/m3]
10089100 - ALTAIR 4 Pen-O2-CO-H2S with MotionAlert
10089097 - ALTAIR 4 Pen-O2-CO-H2S
10089101 - ALTAIR 4 Pen-O2-CO with MotionAlert
10089098 - ALTAIR 4 Pen-O2-CO
10091474 - ALTAIR 4 Pen-O2-H2S with MotionAlert
10091473 - ALTAIR 4 Pen-O2-H2S

Data Sheet

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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