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ISC TMX412 VS Crowcon's Tetra

Research the values of Industrial Scientific Corporation TMX412 against Crowcon's Tetra portable gas detector...

Even though there is a wide selection of portable multi-gas monitors available today, they are not all built the same.  There are big differences in ease of operation, standard features and pricing.  Compare ISC TMX412 against what we feel is the industry standard personal gas monitor, Crowcon Tetra.  We hope this can help you see where the ISC TMX412 stacks up against other portable gas detectors.

ISC TMX412 portable gas monitor


Benefits of ISC TMX412 vs. Crowcon Tetra...

ISC TMX412 offers 2 button operation and for a visual alarm has red LED's (light emitting diodes).  Tetra features simple 1 button operation and has a startling red-blue alarm LED combination that provides additional safety.  We prefer the a blue and red combination because blue light photons have higher energy than red, making blue light much more visible.  Plus you communicate the danger associated with the color red.

Industrial Scientific Corporation TMX412's internal software offers no conformity standards.  Tetra comes equipped with internal software that conforms to IEC 61508, guaranteeing software that provides functional safety.

TMX412 offers data logging only as an expensive option requiring additional expense for a PC software/cable kit.  Tetra features a PC interface by IR link to portable PC software.  This allows for easy access for configuration changes and event log transfer via a physically sealed light, as opposed to a hole where a plug fits.  Tetra also allows printing of formatted configuration reports and calibration certificates.

ISC TMX412 is available only with a  Diffusion/Hand Aspirator requiring a separate pump that needs its own power, adding bulk, weight and extra cost.  Tetra offers a pumped version that is less expensive and better suited for applications requiring regular sampling.

Industrial Scientific TMX412 lasts for 10 hours on full charge and uses dated Nicad battery technology.  Tetra offers at least 12 hours of power on full charge with Li-ion batteries, making it better suited for shift changes.

Features of Tetra...

Tetra is the most rugged, reliable and reasonably priced portable multi-gas detector on the market today.  Tetra's tough casing is dust proof and resistant to water projected from a nozzle meeting Ingress Protection standard of IP65 making it perfect for outdoor use.  TMX412 offers no IP specification.  Tetra's top display makes it simple for the operator to read while clipped to his shirt or belt.  TMX412 has the display on the front, requiring the operator to handle the unit, making readings more difficult, especially in confined spaces.

Tetra provides more value than TMX412...

Unlike TMX412, Crowcon's Tetra offers simple 1 button operation that works like a computer mouse; either a single or double click.  Tetra's rugged housing and ability to float will save your budget from expensive repair and replacement costs.  Give yourself and your employees piece of mind with the finest gas detection instrument available at a reasonable price.  Increase safety and control costs with the innovative and reliable Tetra.

Compare Features of Tetra with ISC TMX412...
  Crowcon Tetra ISC TMX412
Number of Sensors 1-4 1-4
Sensor Types Fl, OX, Toxics FL/OX/Toxics
Max number toxic gases 4 from total of 12 2 from a list of 6
Intelligent Sensors Yes, fully pre-calibrated Yes
Size 124x128x57 mm 121x70x51 mm
Weight 500g 738g
Ingress Protection IP65 Not Specified
Instantaneous Alarms 2 ??
TWA Alarms 8hr and 15min ??
Alarm Tones Selectable from 5 ??
Sounder Output 85dBA @ 1ft ??
Visual Alarm Red and Blue LEDs on top ??
Vibrating Alarm Yes ??
Confidence Flash Flashing Icon ??
Confidence Sound Every 10 seconds ??
Low Battery Alarm Yes ??
Display Simultaneous Simultaneous
Display Type Graphic LCD LCD
Peak Display Capability On Demand Yes
TWA Toxic Display On Demand ??
Auto zero on Start Up Configurable ??
Computer Interface IR ??
Data Logging Event Logging Optional, extra cost
Flammable Gas Factors Yes ??
Rechargeable Battery Li-ion Nicad
Operating Time 12hrs 10hrs
Recharge Time 5 hours Not specified
Dry Cell Batteries AA cells Alkaline or Lithium
Operating Time 15 hours 11 hours alkaline, 18 hours Lithium
Sampling Diffusion/Aspirator/Pumped Diffusion
Electric Pump Internal, optional External option
Certification Code Rechargeable (Europe) EEx iad IIC T4 (Tamb +55degC) ??
Certification Code Dry Cell (Europe) EEX iad IIC T3 (Tamb +55degC) ??
Temperature Rating -20 to +55 C -20 to +50 C
Certification Code Rechargeable (US) Class I Division 1 Groups A,B,C,D Class I Division 1 Groups A,B,C,D
Certification Code Dry Cell (US) Class I Division 1 Groups A,B,C,D Class I Division 1 Groups A,B,C,D
Rubber Boot Over molded ??
Carry case Yes ??
Chest Harness Yes ??
Shoulder Strap Yes ??


See the Crowcon Tetra Gas Monitor or read about all Portable Gas Detectors.

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


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