Crowcon Tetra 3, 4-gases portable gas detector

Máy đo khí Crowcon Tetra 3 
Máy đo khí Crowcon Tetra 3 

Crowcon Tetra 3 4-Gas detector is the above display type, explosive gas measurement option, O2, CO, H2S, SO2, O3, NH3 and CO2

The Crowcon Tetra 3 multi-gas monitor is a multi-gas detector that is compact, durable and easily detects diffused gases in the air. It has a single control button, compact size, clear screen, upper screen design that makes it easy to use during work when wearing it in front of the chest or belt. The machine is suitable for water, telecommunications, food, beverage and other gas monitoring areas.

Despite its compact size Tetra: 3 is extremely solid and waterproof.

Refer to the popular 4-gas detector models available on the market


  • Detects 4 gases simultaneously, compact and light
  • Infrared sensor options can be selected for CO2 measurement
  • 1 single-use button, easy to use even when wearing gloves
  • Sturdy structure, anti-slip inert, shockproof, anti-vibration
  • Stable Lithium-ion battery, allowing up to 16 hours of continuous use after each battery charge (unaffected memory)
  • Waterproof and dustproof, it is possible to dip the whole machine into the water.
  • Fast alarm with 95 dBa siren, 2-color visual bright display and vibration alarm
  • Easy-to-read screen, built-in backlight, with battery capacity indicator function

The Tetra 3 Crowcon gas detector detects 4 standard gases for gases (carbon monoxide, methane, oxygen and hydrogen sulphide), which can be expanded to gases: ammonia, ozone, sulphur dioxide, H2 filtered CO (for steel mills) and IR carbon dioxide (for safe area use only).


Size114 x 71 x 48mm (tapers to 20mm) (4.5 x 2.8 x 1.9ins)
Weight295g (10.4oz)
Alarms95dB multiple alarm sounds allow selection of distinctive tones for different alarm levels
Internal vibrating alarm
DisplayGraphic 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 loggingTimed: 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 loggingAlarm, over range, calibration, bump, on/off, TWA, 1000 events
BatteryRechargeable Li-ion battery
Operating timeBased 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
SamplingDiffusion 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)
Humidity20 to 90% RH@ 40°C non-condensing
Ingress protectionIP65 and IP67
ApprovalsATEX II 2 G Ex ia d IIC T4 Gb (-20°C ≤ Ta ≤ +55°C)
IECEx Ex ia d IIC T4 Gb (-20°C ≤ Ta ≤ +55°C) BAS05.0059
CSA Class I Division 1 Groups A, B, C and D
Safety standardsEN60079-0, EN60079-11, EN60079-1
CSA22.2, 152
EN50270, EN50271, EN50104, EN45544, EN60079, IEC61508
PC InterfaceRS232 connection from interface module in charger
RS232/USB converter available
CalibrationCan be routinely calibrated using Portables PC software or Crowcon Checkbox IMH
ChargingSingle 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


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.

GasRangeTypical Alarms
Flammable0-100% LEL20
Hydrogen sulphide (H2S)0-100ppm5ppm
Carbon monoxide (CO)1-500ppm30ppm
Sulpher dioxide (SO2)0-20ppm1ppm
Ozone (O3)0-1ppm0.1ppm
Ammonia (NH3)0-100ppm25ppm
*Carbon dioxide (CO2)0-5%0.5ppm

* 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.

Crowcon Tetra 3 Gas Meter

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