BPA: gas detectors
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 Tetra 3 Multi-gas Monitor

Ultra-rugged and water proof, the Tetra 3 is the easiest to use gas detector on the market...

Designed for use in industrial environments, Tetra 3 is easy to use and highly successful.  At only 269g, it is small in size and weight, yet extremely effective with one button operation. It is also easy to use even with a gloved hand. 

Tetra 3's design has been based on the dependable Tetra instrument.  The simple indication of operating status and 30 day countdown warning of calibration due date add to the reliability and efficiency of the Tetra 3.  Along with a tough plastic construction, it has added protection with over-moulded rubber. 

The lithium-ion battery provides the Tetra 3 with over 16 hours of continuous operation.  It is rapid and effective with an instantaneous 95 dBa audible alarm, red and blue visual alarm, as well as an internal vibrating alarm.


  • Design based on the tried and tested Tetra instrument
  • Large, top mounted, 4 gas display
  • Durable construction with over molded rubber resists vibration and shock
  • Ultra rugged and waterproof
  • Dust and water resistant to IP65 and IP67
  • Tetra 3 operates with a single button and an easy to read graphic LCD display with backlight
  • Rechargeable lithium-ion battery provides 16 hours of continuous operation
  • 30 day countdown warning of calibration due date
  • Features audible, visual, and vibrating alarms
  • Crowcon, producer of Tetra 3,  has provided quality gas detection equipment for over 35 years

Crowcon Tetra 3 Personal Multi-gas Monitor.

Crowcon Tetra 3
Personal Multi-Gas Monitor

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* Readily absorbed gases (NO2, CL2,  PH3, O3, F2 and HF) WILL NOT be detected if an aspirator or hose is used and should not be used in pumped instruments with the pump operating.

Crowcon Tetra gas detector confined space entry


  • Tetra 3 personal gas monitor is intended for use in demanding industrial environments.


Product Information...

  • Lightweight - at just 269g - quality construction makes Tetra 3 durable and intrinsically safe
  • Easy to read red/blue visual alarm, 95dBa audible alarm, and internal vibrating alarm
  • Operating status can be easily viewed
  • Internal vibrating alarm - two levels of immediate alarm - audible alarm 94dBA (@30cm)
  • Dust and water resistant to IP65 and IP67 - (IP) Ingress Protection is the standard system used for classifying the degree of protection provided by the enclosures of electrical equipment

Gas Test Kit

The Gas Test Kit provides the customer a simple way to verify that Tetra 3 is performing within its acceptable limits.  This kit allows the customer a method to evaluate the Tetra 3 response and determine if it is functioning within its defined applications and if calibration is accurate. All Tetra 3 instruments are pre-programmed for use with the gas test kit

Relevance of Personal Gas Detectors

Thousands of lives are lost and millions of dollars in property damage occur each year throughout the world due to gas explosions.  A gas explosion is defined as a process where combustion of a premixed gas-air cloud causes a rapid increase of pressure.  Typically, natural gas is flammable in 4 to 14 percent natural gas to air mixture.  In a confined space, that mixture can be not only flammable, but explosive.  There are over 60 million gas service lines in the United States alone.  Using a personal gas monitor and focusing on leak survey procedures, pinpointing and recognition of potential hazards, this potentially dangerous problem can be greatly reduced.  Crowcon's highly regarded reputation for providing solutions to fire and gas detection ensures customers of high quality and competitive prices.


Tetra 3 Specifications
Weight 269 Grams (9.6oz)
Dimensions 112x72x49 (tapers to 20mm)
4.4x2.8x1.9 inches
Typical Measuring Ranges and Alarm Settings Gas Range Alarm (UK-ROW) Alarm (US)
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. Flammable 0-100% LEL 20% LEL 10% LEL
Hydrogen Sulfide 0-50 PPM 5 PPM 10 PPM
Carbon Monoxide 0-500 PPM 30 PPM 35 PPM
Oxygen 0-25% 19% & 23.5% 19.5% & 23.5%
Typical Alarm Response Time Flammable 20 Seconds
Oxygen 10 Seconds
Typical Toxic Gas 30 Seconds
Audible Alarm 95dBa
Multiple alarm sounds allow selection of distinctive tones for different alarm levels
Visible Alarm Dual color Red/Blue flashing LED pair in gas hazard
Vibrating Alarm 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 within 30 days, calibration overdue, or service required.
Display Mode Normal display for real time gas concentration levels. Display recall for Peak readings and TWA
Datalogging Timed datalogging: 50 hours at 1 minute data rate (3000 records)
Threshold logging (starts after adjustable preset level) Event logging: >1500 events
Battery Type Rechargable Li-ion battery
Operating temp. range -20C to +55C (-4F to +131F)
Humidity 0-99% RH
Approval Codes USA Class I Division 1 Groups A, B, C, D. pending
  Europe ATEX II 2G EEx iad IIC T4 (Tamb -20oC to +55oC)
Standards USA & Canada UL913, CSA22.2, 152
  Europe EN50014, EN50020, EN50018, 94/9/EC
Ingress Protection IP65 and IP67


See our entire line of Portable Gas Monitors or read about all Gas Monitors.

If you have any questions, call us toll free, we'll be glad to help!


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