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Gas monitoring for tunnels and underground

Road and railroad tunnels are considered as closed or partially closed structures. They feature same risks and hazards than interventions in confined spaces, such as oxygen deficiency and potential presence of combustible or toxic gas or vapor.

détecteur gaz et masque auto sauveteur pour travaux en tunnels

A confined space is a closed or partially closed structure and most of severe or lethal accidents that occur while entering these areas are linked to combustible, toxic or asphyxiating (lack of oxygen) gases. Ce seront donc les premiers risques à évaluer dans le cadre de l’élaboration d’une procédure de travail avec des appareils de détection de gaz dans les tunnels.

GAS EXPOSURE IN TUNNELS

Chronic exposure to exhaust gases can cause severe neurological disorders (headaches, dizziness, irritability, drowsiness, convulsions), bronchial irritations or even lungs cancer in some cases. It is thus essential to permanently measure and control TWA (time weighted average) and STEL (short term exposure limit) exposure values in road and railroad tunnels for:

  • Carbon monoxide
  • Carbon dioxide
  • Nitrogen oxides (nitric oxide and nitrogen dioxide)
  • Sulphur dioxide
  • Volatile organic compounds (VOC) including benzene
  • Oxygen defficiency

GAS DETECTION FOR TUNNELS

Multigas detector and area gas monitor

Concerning personal protection, a multigas detector remains essential and indispensable. In addition, a gas area monitor will secure the working area. For very long tunnels, it will be advisable to use units with communication solutions as explained below…

LENS Wireless technology

Particularly suitable for tunnels, the LENS™ Wireless technology is a new way to approach safety. With this technology, once a detector or an area gas monitor enters in alarm following a gas hazard, a « man in distress » alarm or a panic situation, every paired detector will get instant alert.

Go to « LENS Wireless technology » page

respiratory protection and self-rescuer mask

Self-rescuer masks a respiratory protective devices especially designed for emergency evacuation in non-breathable atmosphere – poorly oxygenated, smoky or extremmely toxic areas – for use when an air purifying respirator would be unefficient or hazardous. They originally have been designed for emergency evacuations from mines or long tunnels.

GAS DETECTION AND RESPIRATORY PROTECTION FOR TUNNELS

The most commonly used and the most cost-effective unit for confined space applications is the 4 gas detector (combustible gases, O2, CO and H2S). Yet for tunnels it advisable to use a multigas detector with CO-CO2-NO-NO2-O2 sensors. For emergency evacuation, a self-rescuer respirator remains indispensable!

The Radius BZ1 is a high performance area gas monitor. As it is made with rough materials, it suits in the most demanding ATEX standards and the harshest environments.

  • Industrial scientific area gas monitor Radius BZ1 for workers safety

Area gas monitor – RADIUS BZ1

The Radius BZ1 is a high performance area gas monitor. As it is made with rough materials, it suits in the most demanding ATEX standards and the harshest environments.

Industrial scientific area gas monitor Radius BZ1 for workers safety
  • Detection of combustible gases, Cl2, CO, H2, H2S, HCN, NH3, NO2, O2, SO2 and VOC.
  • Duplicate 108 dB audible alarm and red & blue LED visual alarm
  • Runtime: 168 hours without pump (7 days) and 84 hours with pump
  • Dimensions: 29 x 29 x 55 cm – weight 7.5 kg – 11.2 cm LCD display
  • Available with optional LENS wireless technology
Additional information

Designed in an impact and weather-resistant polycarbonate alloys housing, the Radius BZ1 area gas monitor is an extremely flexible solution to monitor a clearly defined area or a confined space. Moreover, the Radius BZ1 area gas monitor is equipped with the DualSense technology and is available with optional LENS Wireless technology.

 

DualSense technology uses two sensors of the same type to determine the concentration of a target gas in the atmosphere and reduce the risk of instrument failure while improving gas reading accuracy.

 

LENS is the first wireless gas detection solution that allows personal monitors and area monitors to communicate gas readings and alarms with one another. Thanks to the 360-degree gas path and all-weather sensor use, the Radius BZ1 area monitor can accurately detect gases regardless of environmental conditions and avoid false alarms.

 

The special nature of this gas detection area monitoring device lies in its SafeCore® module. This unit concentrates every critical technology pieces such as software, pumps and sensors. this module can be easily removed to be placed in any base in order to have a smaller fleet of instruments, easily dock it on a socking station – to download data logs and alarm events, bump test, calibrate and change settings – or to adapt each configuration to changin environment.

 

In case of anormal concentrations, powerful audible (108 dB at 1 m) and visual (ultra-bright blue and red lights) alarms will alert any operator working in the area, even in high-noise and dark environments. Custom alarm action messages like “EVACUATE” or “VENTILATE” can furthermore be configured in case of emergency situations in order to quickly and safely take corrective actions.

 

Lastly, the Radius BZ1 area gas monitor is equipped with a long-duration battery with 7 days (1168 hours) or typical runtime. An optional external extended battery can extend it over one month.

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VENTIS-MX4 portable gas detector that complies with ATEX standards. This detector can detect from 1 to 4 gases with a large range of sensor combinations (Explo 0-100% LEL, O2, CO, H2S, NO2, SO2).

Portable 4 gas detector – VENTIS-MX4 – EXLO, O2, CO, H2S

VENTIS-MX4 portable gas detector that complies with ATEX standards. This detector can detect from 1 to 4 gases with a large range of sensor combinations (Explo 0-100% LEL, O2, CO, H2S, NO2, SO2).

Portable gas detector MX4-Ventis
  • Detection of Explo (0-100% LEL), O2, CO, H2S, NO2, SO2
  • Robust, shock-resistant and waterproof device (IP66 and IP67)
  • Enhanced visibility with safety orange overmold
  • Compact and lightweight: first multigas detector with a single-gas detector size
  • Optional slide-on sampling pump (up to 30 meters)
Additional information

The Ventis-MX4 is a portable multigas detector. Contrary to single-gas detectors, it can detect up to 4 gases. Thanks to its rechargeable Li-ion battery, it can continuously operate during around 12 hours at 20°C ambient temperature. This battery can be replaced by an optional extended battery for up to 20 hours of autonomy without pump.

The Ventis-MX4 portable gas detector can detect up to 4 gases amongst explosive gases, oxygen (O2), carbon monoxide (CO), hydrogen sulfide (H2S), sulfur dioxide (SO2) and nitrogen dioxide (NO2). A specific location is dedicated to the explo sensor (catalytic sensor) and the oxygen sensor (electrochemical sensor). A 4 gas unit will basically include oxygen and explo sensors.

The Ventis-MX4 features 3 different alarms. The first one is a powerful 95 dB at 30 cm audible alarm to alert in noisy environmets. A high visibility red LED visual alarm and an ultra- vibrating alarm are added to improve safety. Two alarm levels are configures: low and high alarms – which are basically calibrated under occupational safety at work data.

The Ventis-MX4 portable gas detector also features the same physical properties – dimension and weight – than a single-gas detector. It can be wore close to the breathing tracts thanks to its crocodile clip without disturbing the user. This multigas detector shock-resistant and waterproof thanks to its high visibility polycarbonate-made overmold.

As this device can detect explosive gases, it meets current EU ATEX standards (explosive atmosphere). A sampling pump – VSP for Ventis-MX4 – is available to draw remote samples (up to 30 meters) before interventions – e.g. in confined space.

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The Ventis Pro5 detector is equipped with new features such as a panic button to improve safety of workers evolving in hazardous areas.

Detection of the combustible gases, NH3, CO, CO/H2S, H2S, HCN, NO2, O2, SO2, CO2, HC.

Portable multi gas detector – VENTIS PRO5 – up to 5 gases

The Ventis Pro5 detector is equipped with new features such as a panic button to improve safety of workers evolving in hazardous areas.

Detection of the combustible gases, NH3, CO, CO/H2S, H2S, HCN, NO2, O2, SO2, CO2, HC.

  • Dimensions: 104 x 58 x 36 mm – weight: 200 grams without pump
  • Audible (95 dB), LED visual (2 red and 2 blue) and vibrating alarms
  • Rechargeable lithium-ion battery with optional extended battery
  • Polycarbonate housing with waterproof rubber overmold (IP68)
  • Datalogging over 3 months with 10 seconds interval
Additional information

The Ventis Pro5 multi gas detector was especially designed to silmutaneously detect up to 5 gases among the combustible gases, NH3, CO, CO/H2S, H2S HCN, NO2, O2, SO2, CO2 and HC.

 

This flexible detector features a panic button to alert nearby teams when user is in distress. It also features a mandown alert function which is set to activate after a defined period of time without motion.

 

In case of anormal concentrations, powerful audible (95 dB à 10 cm) and visual (ultra-bright blue and red lights) alarms will alert any operator working in the area, even in high-noise and dark environments.

Custom alarm action messages like “EVACUATE” or “VENTILATE” can furthermore be configured in case of emergency situations in order to safely and quickly take corrective actions.

 

Made of polycarbonate with protective rubber overmold, this gas detector is available either in black or high-visibility safety orange versions and can be combined with the VSP slide-on pump. Its integrated data logger can record up to 3 months of events. Water and dust-resistant (IP68), the Ventis Pro5 can be used in pumped version for use in confined spaces or without pump as a personal protective equipment.

 

The Ventis Pro5 portable multi gas detector also features the LENS Wireless technology. LENS is the first wireless gas detection solution that allows personal monitors and area monitors to communicate gas readings and alarms with one another. This way, panic and mandown alarms will be communicated to other Ventos Pro detectors operating in the same area in order to alert everyone on the hazardous situations.

 

Lastly, the Ventis Pro5 benefits from the iAssign® technology for site and user follow-up. Thanks to this enhanced technology, every data recorded by the device will be assigned to the user ID. This process allows amongst other things users to wear several gas detectors within the same working day.

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ATEX modular explosimeter to monitor combustible gases (natural gas, butane, propane, hydrocarbons, solvents…) with the opprtunity to add additional O2, CO, H2S sensors.

MX4-EXPLO combustible gases detector (explosimeter)

ATEX modular explosimeter to monitor combustible gases (natural gas, butane, propane, hydrocarbons, solvents…) with the opprtunity to add additional O2, CO, H2S sensors.

Portable gas detector MX4-Explo
  • Gas detection: combustible gases from 0 to 100 % LEL
  • Polycarbonate materials with robust and waterproof overmold.
  • Audible (95 dB at 30 cm), visual and vibrating alarm.
  • Longlenght battery, 12 hours continuous.
  • Optional slide on pump to draw samples.
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Well-suited for emergency evacuation from confined spaces, the OXY 3000/6000 is a SCSR self-contained self-rescue device that chemically produces breathable air. Different versions offer from 30 up to 60 minutes autonomy.

  • drager SCSR oxy 3000 6000 oxygen self rescuer for emergency escape

Self-rescuer SCSR OXY 3000/6000

Well-suited for emergency evacuation from confined spaces, the OXY 3000/6000 is a SCSR self-contained self-rescue device that chemically produces breathable air. Different versions offer from 30 up to 60 minutes autonomy.

drager SCSR oxy 3000 6000 oxygen self rescuer for emergency escape
  • Up to 60 minutes autonomy.
  • Shock absorbent shell to protect the device.
  • Safety Eye for easy visual safety check.
  • Dimensions: 265 x 217 x 125 mm for less than 4 kg.
  • Approved in compliance with SA 89/686/CEE DIN EN 13794 standards and Australian coal mining.
  • Storage shelf life up to 10 years.
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