Portable 4-gas detectors (% LEL, O2, CO & H2S)

Widely used in industry and the service sector, 4-gas detectors simultaneously detect flammable gases (Lower Explosive Limit in %LEL), carbon monoxide (CO), hydrogen sulfide (H2S), and lack of oxygen (O2) in ambient air. These are the most versatile portable gas detectors on the market and are recommended (even required) as part of CATEC training (certificate of competence to work in confined spaces in the water and sanitation sector) in the gas and oil industries, and in public works.

4-gas detectors (% LEL, O2, CO & H2S)
  1. The Ventis MX4 portable 4-gas detector is very popular with confined space workers (see CATEC training). It detects explosive gases (0-100% LEL), lack of oxygen (O2), carbon monoxide (CO), and hydrogen sulfide (H2S). It can be used in diffusion mode or remote gas sampling mode with the optional VSP clip-on pump.

    • ATEX 4-gas detector: Explosive gases (0-100% LEL), O2, CO, H2S, NO2 or SO2 sensors too
    • 95 dB audible, visual and vibrating alarms for two thresholds, STEL and TWA (Threshold Limit Value and Average Exposure Value)
    • Very robust, shockproof, water and dust resistant (IP66 and IP67
    • Small and compact: first multi-gas detector of the size of a single gas
    • Optional VSP clip-on pump for remote gas sampling up to 30 m
  2. The X-am 2500 portable 4-gas detector (explosive gases 0-100% LEL, O2, CO & H2S) has been designed especially for industry, sanitation, public works, or interventions in confined spaces (CATEC). It is a versatile, high-performance device with an excellent quality/price ratio guaranteeing a high level of safety with low operating costs.

    • Portable ATEX 4-gas detector for explosive gases detection (0-100% LEL), O2, CO, and H2S, can also receive NO2 or SO2 sensors
    • Large LCD: easy navigation, comfortable reading of gas concentrations
    • Ergonomic design, robust, water and dust proof (IP67)
    • Long-life T4 NiMH battery (less than 4 hours charge time)
    • Optional clip-on pump for remote gas sampling up to 30 m
  3. Small, light, and ergonomic, the portable multi gas detector X-am 5000 from Dräger can detect the presence of 1 to 5 gases simultaneously, including Explosive gases (catalytic), AsH3, B2H6, Br2, Cl2, ClO2, CO, CO2, F2, H2, H2S, HCN, NH3, NO, NO2, O2, O3, PH3, SiH4, SO2 and various organic vapors (acetylene, ethylene, ethanol, formaldehyde, methanol, styrene, propylene, etc. ).

    • Compact and lightweight with a large selection of interchangeable sensors
    • Long-life DrägerSensor XXS sensors with short response time
    • Ergonomic, robust, and water and dust tight (IP67) ATEX-certified design
    • Optional clip-on pump for remote gas sampling
    • Compatible with the Dräger X-zone 5500 area monitor
  4. The G7c from Blackline Safety is a geolocated gas detector with an integrated lone worker alarm (IWAS) device. It is the first complete gas detection system (up to 5 gases simultaneously) that integrates 2G/3G connectivity with alarm functions with geolocation, alert (SMS, email, Talkie-Walkie.), and analysis via an archiving platform hosted on the cloud.

    • Geolocated multi-gas detector with PTI - explosive gases, Cl2, ClO2, CO, CO2, H2, H2S, HCN, NH3, O2, O3, SO2 & VOC detection
    • Full DATI (lone worker alert device) with PTT (push to talk) functionality
    • Real-time monitoring with GPS geolocation & 2G/3G connection
    • Available in broadcast mode or with a gas sampling pump
    • Very detailed analysis reports (graphs, bar graphs, alarm location, etc.

4 gas detectors in confined spaces

Many industrial accidents involve interventions in confined spaces, the main risk being generated by the latent or accidental presence of a toxic, flammable or simply oxygen-depleted atmosphere.

Recommended for interventions in confined spaces as part of CATEC training, 4-gas detectors simultaneously detect explosive gases (natural gas, LPG, hydrocarbons, alcohols and solvents), oxygen (or rather the lack of oxygen), carbon monoxide (CO) and hydrogen sulfide (H2S). They control the ambient air and alert the interveners in presence of the following risks: 

  • Risk of asphyxia, anoxia or hypoxia: transient or permanent absence of oxygen;
  • Risk of intoxication: inhalation or absorption of toxic gases such as hydrogen sulfide (H2S), carbon monoxide (CO) or carbon dioxide (CO2);
  • Explosion and fire: presence of flammable gases (methane in this case) that can cause fire and explosion risks.

4-gas detectors and CATEC® Training

With nearly 35,000 workers in the water treatment and sanitation sector, the CATEC® has become a necessity for safety at work. It is based on the elements of the recommendations R447 of June 25, 2009 and R472 of November 19, 2012. These recommendations suggest a common training base for workers and supervisors in the sanitation and water treatment sector. 

 In order to ensure the safety and health of the worker required to intervene in a confined space, this device defines at least the methods, the instructions to be respected and the safety equipment essential for all interventions such as a 4 gas detector for measurement and the control of the ambient air, a self-rescue mask for the emergency evacuations, a fall protection equipment and a device of ventilation and air extraction.

Maintenance and calibration of 4 gas detectors

4-gas detectors are safety devices that require periodic maintenance and verification, such as calibration with standard gases. This operation involves exposing the device to a known gas concentration for a given time and validating it as a reference point for future measurements.

GazDetect's "Included Maintenance" solution is a simple, cost-effective concept that includes maintenance and periodic checks for two or three years, depending on the model at the time of purchase. It's an "all-inclusive" version for gas detection, where EVERYTHING is included, even return transport.