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Ventis® MX4 Four-Gas Monitor

Get the simple, reliable gas detection you need with the Ventis MX4, a four-gas monitor designed to be rugged yet lightweight and easy to wear. The Ventis MX4 eliminates the need for extra monitors by transitioning seamlessly from personal monitoring to confined space entry with a slide-on pump.

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Flexibility to Fit Your Needs

Customize the Ventis MX4 to fit your needs with up to four sensors, multiple runtime options, alarm thresholds, and more. Whether you’re performing daily confined space entries, wearing the instrument for personal gas detection, or anywhere in between, there’s a Ventis MX4 configuration that’s right for you.


Monitor up to four of these gases: LEL (methane), LEL (pentane), CO, H2S, O2, CO/H2 low, SO2, NO2.


Enjoy uninterrupted runtime with optional batteries that run for 20-hours on a single charge. 


Personalize the monitor to your needs by selecting alarm thresholds and setting latch alarms.

How the Ventis MX4 Multi-Gas Monitor Works

Ventis MX4

Integral pump or slide-on pump available for confined space entries.

Dock overdue and maintenance reminders.

Compatibility with DSX Docking Station and iNet Exchange.

Easy to read display.

Save time with the Ventis MX4.

Automate Basic Maintenance

Keep your Ventis MX4 monitors up and running with a compatible DSXi Docking Station, which automatically bump tests, calibrates, charges, and uploads gas detector data each time you dock a monitor.

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iNet Exchange Advantage

iNet Exchange eliminates maintenance and repairs by reviewing the performance of the monitor, sensors, circuit board, microprocessors, and pump every time you dock a monitor. You’ll know if a monitor needs attention before it fails, and we will automatically replace it.

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Build Your Ventis MX4

Choose a range of monitor capabilities to best suit your needs, including certifications, sensors, languages, and more.

Build Your Gas Detector

Like the Ventis MX4? You'll Love the Ventis Pro5

Take your gas detection program to the next level by adding connectivity. Improve site safety with the Ventis Pro5: a flexible, multi-gas monitor with wireless connectivity and real-time alerts that show who needs help, why they need help, and where they are located.

Check out the Ventis Pro5

Comprehensive Training

Make the most of your Ventis MX4 with informative gas detection courses.

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Supporting Documents

Comparison Guide

Compare Multi-Gas Monitors

Compare Monitors
Declaration of Conformity

Ventis MX4 Declaration of Conformity

Spec Sheet

Ventis MX4 Spec Sheet

Product Manual

Ventis MX4 Product Manual

Frequently Asked Questions

What sensors does the Ventis MX4 support?

The Ventis MX4 offers sensor and configuration options for a number of industries and applications, making it an efficient choice for both personal gas detection and confined space entries. The Ventis MX4 supports the following gas sensors: LEL (methane), LEL (pentane), CO, H2S, O2, CO/H2 low, SO2, and NO2.

How can I use the Ventis MX4 for confined space pre-entry sampling?

If you need both pumped and non-pumped functionality, buying one monitor that can do both is often more cost effective and reduces the number of monitors your workers carry. 

The Ventis MX4 is available in both pumped and non-pumped versions, or can be used with the Ventis Slide-on Pump for pre-entry sampling. With the Ventis Slide-on Pump, you can eliminate the need for extra monitors and transition seamlessly from personal monitoring to confined space entry use. The Ventis Slide-on Pump is ideal for operators who wear their gas monitors primarily for personal protection, but occasionally require a pump for confined space entries.

With the Ventis Slide-on Pump, you can:

  • Conveniently sample from up to 50 feet away.
  • Easily attach the pump with no tools.
  • Simplify charging by using the same batteries as Ventis monitors.

What is the warranty on the Ventis MX4?

Not all gas detectors are created equal, and warranty coverage reflects that. Shorter warranties indicate that the monitor might have a shorter lifespan. The Ventis MX4 comes with a four-year warranty for the monitor and standard four-gas sensors.

What is the lifespan of the Ventis MX4?

If an inexpensive or “disposable” monitor will need to be replaced every year or two, think of the long-term cost when replacing these monitors. With the Ventis MX4, you can upgrade firmware, replace batteries and sensors, and access other service features that extend the monitor’s lifespan.

Are sensors interchangeable?

The sensors are interchangeable. If a user switches a sensor, the monitor will immediately begin detecting the new configuration.

Ventis MX4 Technical Specifications


The monitor, pump (if applicable), CO, H2S, O2, and LEL sensors have a four-year warranty. All other sensors and batteries are warranted for two years.

Power Source and Run Time

Rechargeable slim-extended lithium-ion battery

  • (18 hours typical @ 20°C) without pump

Rechargeable lithium-ion battery

  • (12 hours typical @ 20°C) without pump

Rechargeable extended-range lithium-ion battery

  • (20 hours typical @ 20°C) without pump
  • (12 hours typical @ 20°C) with pump

Replaceable AAA alkaline battery

  • (8 hours typical @ 20°C) without pump
  • (4 hours typical @ 20°C) with pump

Temperature Range

-20 °C to 50 °C (-4 °F to 122 °F) **

Humidity Range

15-95% non-condensing (continuous)

Sensors and Measuring Ranges

  • Combustible gases: 0-100% LEL in 1% increments
  • Methane (CH4): 0-5% of vol in 0.01% increments
  • Oxygen (O2): 0-30% of vol in 0.1% increments
  • Carbon monoxide (CO): 0-1,000 ppm in 1 ppm increments
  • Hydrogen sulfide (H2S): 0-500 ppm in 0.1 ppm increments
  • Nitrogen dioxide (NO2): 0-150 ppm in 0.1 ppm increments
  • Sulfur dioxide (SO2): 0-150 ppm in 0.1 ppm increments