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The Tetra 3 multi-gas monitor is a compact, robust and easy-to-use diffusion based detector. Single button operation, small size and clear top-mounted display make it a favourite in the market amongst those working in demanding industrial environments, such as those in the water, telecoms, food, brewing or hydrocarbons sectors.


The Tetra 3 portable multi gas monitor can detect and monitor the four most common gases (carbon monoxide, methane, oxygen and hydrogen sulphide), but also an expanded range: ammonia, ozone, sulphur dioxide, H2 filtered CO (for steel plants) and IR carbon dioxide (for safe area use only).


  • Rugged And Impact-Resistant Design Provides Extra Shock And Vibration Protection – provides protection in the harshest environment
  • Water and Dust Resistant to IP65 and IP67
  • Can Be Submerged In Water

Effective warning:

  • 95dB Audible Alarm – ensures clear warning facilitating prompt evacuations from hazard zones
  • Vivid Red/Blue Visual Alarm
  • Vibrating Alarm


  • Proven Sensor Technology And Software Operation – Provides reliability you can trust and has the power to cover you for an extended shift
  • Clear “Calibration Due” Warning
  • Lithium-Ion Battery Provides Over 14 Hours Continuous Operation From A Single Charge With No Memory Effects

User friendly:

  • Single Button Operation For All Functions – can be operated with gloved hands
  • Top Mounted, Backlit Display Of All Gas Readings, Diagnostics And Battery Life – ‘at a glance’ operating status

Gases and Ranges:
Ranges and alarms vary by country and application; these can be configured as required. Each channel can have two instantaneous alarms. Toxic channels also have TWA alarms. Flammable gas calibration is available for methane, propane, butane, pentane, hydrogen and ethylene as standard.

Selectable Gases Range Typical Alarms
Flammable (LEL) 0-100% LEL 20% LEL
Oxygen (O2) 0-25% 19/23.5% Vol.
Hydrogen Sulphide (H2S) 0-100ppm 5ppm
Carbon Monoxide (CO) 1-500ppm 30ppm
Sulphur Dioxide (SO2) 0-20ppm 1ppm
Ozone (O3) 0-1ppm 0.1ppm
Ammonia (NH2) 0-100ppm 25ppm
*Carbon Dioxide (CO2) 0-5% 0.5 % volume
Carbon Monoxide (CO) H2 compensated 0-500ppm 30ppm
Hydrogen Cyanide (HCN) 0-30ppm 10ppm


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