Tetra 3 Multi Gas Detector from Crowcon Detection

Tetra 3 personal portable gas detector from Crowcon Detection Instruments features one button operation, simple even with a gloved hand and is rugged and weather proof, suitable for today’s arduous industrial environments.

The Tetra 3 personal and portable gas detector is designed with the user in mind, the top mount display, full function data and event logs, audible, visual and vibrating alarms delivery top end performance in a small and lightweight package.


  • Proven sensor technology and software operation
  • Simple indications of operating status can be viewed at a glance
  • 30 day countdown warning of calibration due date
  • Li-ion rechargeable battery gives > 16 hours operation
  • True single button operation – the most user friendly range available
  • Easy to read backlit graphic display for gas readings and diagnostics
  • Tough plastic construction to resist even the toughest shock and vibration
  • Overmolded rubber for added protection
  • Water and dust resistant to IP65 and IP 67
  • 95 dBA audible alarm
  • Piercingly bright dual red/blue visual alarm
  • Internal vibrating alarm
  • Time weighted average alarm for 8 hours and 15 minute averages

Instrument Specifications

Audible Alarms 95 dBA, multiple alarm sounds allow selection of distinctive tones for different alarm levels
Visual Alarms Dual color red/blue flashing LED pair in gas hazard
Vibrating Alarm Internal
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.
Display Mode Normal display for continuous real time gas concentration levels, display recall for Peak readings and TWA
Datalogging, Optional Timed datalogging: 50 hours at 1 minute intervals data rate, 3,000 records, threshold logging starts after adjustable preset level, event logging > 1500 events
Battery Type Rechargeable Li-Ion battery
Operating Time Rechargeable: 16 hours minimum
Sampling Diffusion of hand aspirator
Temperature Range -4 to 131°F
Humidity 20-90% RH
PC Interface RS232 connection from interface module in charger, RS232/USB converter available
Accessories Tetra 3 is supplied with an integral alligator clip
Approvals Class I, Div I, Groups A, B, C, D, pending, ATEX II2G EEx iad IIC T4 BASEEFA 03ATEX0193
Ingress Protection IP 65 or IP 67
Weight 10.4 ounces
Dimensions Rechargeable: 4.5″ x 2.8″ x 1.9″

Sensor Specifications

Carbon Monoxide
0-500 ppm
30 ppm
0-100% LEL
20% LEL
Hydrogen Sulfide
0-100 ppm
5 ppm
0-25% Vol
19.5% (low), 23.5% (high)
Sulfur Dioxide 0-20 ppm 1 ppm
Ozone 0-1 ppm 0.1 ppm
Ammonia 0-100 ppm 25 ppm
Carbon Dioxide* 0-5% 0.5%
Dual Toxic Carbon Monoxide/Hydrogen Sulfide  CO: 0-500 ppm, H2S: 0-100 ppm  CO: 30 ppm, H2S: 5 ppm
Carbon Monoxide H2 Filtered 0-500 ppm 30 ppm
Hydrogen Cyanide 0-25 ppm 0-5 ppm

*The Tetra 3 is available in a safe area Carbon Dioxide version offering 0-5% CO2 measurement. The CO2 sensor replaces the flammable option and can be supplied with oxygen and toxic sensors. Not intrinsically safe.

Other ranges and alarm levels are available on request. Each gas channel can have two instantaneous alarm levels set, Toxic channels also have Time Weighted Average alarms. Flammable gas calibration is available for methane, propane, butane, pentane, hydrogen and ethylene as standard.

Ordering Information

The Tetra 3 multi gas detector is supplied with an integral belt/pocket clip. For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email sales@afcintl.com

Catalog No.
Tetra 3 Multi Gas Detector with LEL, O2, CO, H2S sensors, charger, power pack, tubing, clip, and confined space kit
Tetra 3 Multi Gas Detector with LEL, O2, CO, H2S sensors, charger, power pack, clip
Tetra 3 Multi Gas Detector with LEL, O2 sensors, charger, power pack, clip
Confined Space Kit includes harness plate, chest harness, strap, software, calibration gas, regulator, pc interface
Confined Space Kit includes harness plate, chest harness, strap, software, pc interface, case, charger, case
Confined Space Kit includes harness plate, chest harness, strap, software, 34 L cal gas, regulator, pc interface, case


Tetra 3 gas detection instrument literature

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