Crowcon Tetra 3 Multi Gas Detector

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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


Size 114 x 71 x 48mm (tapers to 20mm) (4.5 x 2.8 x 1.9ins)
Weight 295g (10.4oz)
Alarms 95dB multiple alarm sounds allow selection of distinctive tones for different alarm levels
Internal vibrating alarm
Display Graphic LCD with backlight, giving simultaneous display for all gas channels. Graphic symbols for battery (with proportional indication of remaining operation time), healthy operation or fault warning. Start up indication when calibration is due, overdue, or service required.
Normal display: Real time gas concentration levels
Display recall: Peak readings and TWA
Data logging Timed: 50 hours at 1-minute data rate (>12,000 data logs of 4 channels)
Threshold: Starts after adjustable pre-set level
Event: >5,000 events
Event logging Alarm, over range, calibration, bump, on/off, TWA, 1000 events
Battery Rechargeable Li-ion battery
Operating time Based on four-gas instrument fitted with flammable sensor: A 5-hour charge from flat provides at least 12 hours of continuous use.A 12-hour charge provides at least 14 hours of continuous use
Sampling Diffusion or hand aspirator
Operating temperature -20°C to +55°C (-4°F to +131°F)
Storage -25°C to +65°C (-13°F to +149°F)
Humidity 15-95% RH@ 40°C non-condensing
Ingress protection IP65 and IP67
Approvals ATEX II 2G Ex ia db IIC T4 Gb (-20°C ≤ Ta ≤ +55°C)
IECEx Ex db ia IIC T4 Gb (-20°C ≤ Ta ≤ +55°C) BAS05.0059
CSA Class I Division 1 Groups A, B, C and D
Safety standards EN60079-0, EN60079-11, EN60079-1
CSA22.2, 152
EN50270, EN50271, EN50104, EN45544, EN60079, IEC61508
PC Interface RS232 connection from interface module in charger
RS232/USB converter available
Calibration Can be routinely calibrated using Portables PC software or Crowcon Checkbox IMH
Accessories Integral alligator clip 

Optional accessories:

Universal harness plate, shoulder strap, chest harness, aspirator assembly (flow plate, bulb and 2m/6ft tubing), fixed and telescopic sample probes, and an in-line water trap

Charging Single way drop-in charger with UK, EU or US plug or in-line 110V/220V supply
Single way drop-in charger with options as above including PC interface
5 way multi-charger with universal power supply
Vehicle adapter for in-vehicle charging
Universal charger for vehicle, wall and desk mounting with a multi-region plug (supplied with EU/UK/US/Australian inserts) and status indication
Crowcon Connect Compatible? Yes


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.

Gas Range Typical Alarms
Flammable  0-100% LEL  20% LEL
Oxygen (O2)  0-25% 19/23.5% volume
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

* T3 is available in a safe area CO2 version offering 0-5% carbon dioxide measurement.

The CO2 sensor replaces the flammable option and can be supplied with oxygen and toxic sensors.

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