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ISC MG140 VS Crowcon's Tetra

Compare Industrial Scientific Corporation MG140 gas monitor with Crowcon Tetra, a higher quality multiple gas detector at a better cost.

The ISC MG140 portable gas monitor is a decent product, but we've done our homework and found the best.  Shopping by price can often yield misleading assumptions about quality of gas detection products.  A comparison between ISC MG140 gas detector and the Crowcon Tetra multigas monitor illustrates there are considerable differences in operation and features independent of cost.

ISC MG140 portable gas detector


Benefits of the Crowcon Tetra vs ISC MG140...

The Industrial Scientific Corporation MG140's design requires 2 buttons and a front display while the Crowcon Tetra features simple 1 button operation and easy to read top display.  The top display allows the user hands free readings while the unit is attached to a shirt pocket or belt.  This is especially beneficial in confined spaces where maneuverability is an issue.

ISC MG140 visual alarm consists only of red LED's (light emitting diodes) while the Tetra features a highly visible red-blue flashing alarm.  Blue light uses a higher frequency and more powerful light photons which have a higher visibility than red.  Yet the color red communicates danger.  This is why police cars use predominantly blue flashing lights with some red.

Industrial Scientific MG140 design features an enamel coated stainless steel case.  This housing has no Ingress Protection specification.  The Crowcon Tetra is protected to IP65 standards, meaning the unit is sealed against intrusion from dust and foreign objects and protected from water projected from a nozzle.  Tetra can also float if accidentally dropped in water, making recovery simple.  Tetra inner circuitry and sensors are held in place with a flexible suspension structure for further shock absorption.

Industrial Scientific MG140 is available for 4 gases only.  Tetra comes with full sensor interchange ability allowing for flexible combinations of any and all gas sensors.

MG140 lasts for 9 hours on full charge using dated Nicad battery technology.  Tetra offers 12 hours or more of continuous operating time on full charge using Li-ion battery.

MG140 is available in Diffusion/Hand Aspirator versions only.  A costly separate pump is offered requiring its own power, adding bulk, weight and extra cost.  Tetra has a pumped version available making it more suitable for applications requiring regular sampling.

Features of Crowcon Tetra...

Tetra is a durable, innovative personal multi-gas monitor available with a built-in internal pump.  Tetra's rugged casing contains a flexible internal assembly which protects the boards and sensors if the device is dropped.  Tetra's rugged design and ability to float help save costs on repairs and replacements.  Although it weighs only about 1 pound, Tetra is one of the most versatile gas detectors on the market.  If your application is in harsh environments such as steel mills, foundries or hot outdoor climates, Tetra is the instrument for you because it is certified valid for use in temperatures up to 131F.

Get the most value for your money...

Equipment costs can have a major impact in operating budgets.  Don't you prefer products that offer the highest quality, best variety of features and lowest price?  If reliability, durability, personal safety and cost effectiveness are important concerns; then Tetra is the portable multi-gas detector for you.


Compare Features of Tetra with ISC MG140...
  Crowcon Tetra ISC MG140
Number of Sensors 1-4 1-4
Sensor Types Fl, OX, Toxics FL/OX/HS/CO
Max number toxic gases 4 from total of 12  
Intelligent Sensors Yes, fully pre-calibrated  
Size 124x128x57 mm 121x70x42 mm
Weight 500g 680g
Ingress Protection IP65 Not Specified
Instantaneous Alarms 2 ??
TWA Alarms 8hr and 15min ??
Alarm Tones Selectable from 5 ??
Sounder Output 85dBA @ 1ft 90dBA
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 ??
TWA Toxic Display On Demand ??
Auto zero on Start Up Configurable ??
Computer Interface IR ??
Data Logging Event Logging ??
Flammable Gas Factors Yes ??
Rechargeable Battery Li-ion Nicad
Operating Time 12hrs hrs
Recharge Time 5 hours Not specified
Dry Cell Batteries AA cells Alkaline
Operating Time 15 hours 11 hours
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 degC -20 to +50 degC
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.

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BPA is an authorized dealer of Crowcon.  BPA is not an authorized dealer of BW, ISC, Zellweger, MSA, or Draeger products.  Information about products and prices are to be used for comparisons, educational and informational purposes only.  The views and statements expressed on this page represent the opinions of the authors and should not be considered scientific conclusions. BPA assumes no liability for the information contained herein.