What is an LEL Gas Detector?

LEL gas detectors, also known as combustible gas or gas leak detectors, are safety equipment designed to detect the presence of flammable gases. The LEL or Lower Explosive Limit (LEL) is the threshold where a gas or gas mixture is the lowest concentration at which the gas can ignite and cause an explosion. LEL gas detectors monitor combustible gases, including natural gas, methane, propane, butane, volatile solvents, sewer gases, and other hydrocarbons.  Flammable gases and gas vapors are a significant safety hazard where these gases are used, may accumulate, or are a by-product of manufacturing processes.

LEL gas detectors such as PureAire’s Molecular Property Spectrometry (MPS) LEL Gas Detector offer real-time, reliable gas detection, alerting personnel before gas levels become dangerous and enhancing safety from fires, explosions, and asphyxiation in industrial, commercial, and residential environments, including oil and gas, wastewater treatment, chemical and solvent manufacturing facilities.

Advanced MPS Sensor Technology for Maximum Safety

The PureAire MPS LEL Detector has a state-of-the-art MPS gas sensor that accurately detects over 20 combustible gases in hazardous environments. The MPS sensor offers long-life, 15+ year maintenance-free performance, addressing the demanding safety needs of locations working with flammable gases.

Unlike traditional catalytic bead sensors, which require frequent calibration and can be affected by sensor poisoning, the PureAire MPS sensor features include:

• 15+ years of operational life without requiring replacement.
• Immune to poisoning.
• Accurate detection of over 20 combustible gases with one monitor, including hydrogen, without the need for correction factors.
• Consistent performance in varying environmental conditions, reducing false alarms and improving reliability.
• RS-485 interface for seamless communication with centralized systems
• Class l & ll, Division 1, Groups B, C, D, E, F, G

Mitigate Risks: LEL Combustible Gas Detectors

The PureAire MPS LEL Monitor continuously monitors combustible gases in challenging environmental locations where these gases pose a risk, including:

• Oil and Gas Facilities: Ensuring safety during extraction, processing, and storage operations.
• Wastewater Treatment Plants: Monitoring for gases produced during the treatment process.
• Chemical Manufacturing: Detecting potential leaks or accumulations of flammable substances.

Mitigating explosion risks at locations like these and others requires a structured approach to safety, including:

1. Prevention – This includes knowing what combustible gases are in the area, ignition sources, proper ventilation systems, and installing gas detection equipment such as PureAire’s MPS LEL Gas Monitor to detect the presence of combustible gases. The MPS Gas Monitor ensures continuous real-time monitoring to detect leaks before they reach dangerous concentrations.
2. Detection and Early Warning – LEL gas monitoring equipment provides an early warning by triggering audible and visual alarms when gas levels approach the hazardous threshold, alerting personnel to evacuate and take corrective action.
3. Mitigation and Emergency Response – Automated shutdowns and ventilation activation happen when LEL levels reach critical limits. Alarm relays from PureAire’s MPS LEL Monitor integrate seamlessly into safety systems, automatic shut-off valves, and ventilation systems when gas levels reach unsafe levels.

OSHA Safety Regulations for Combustible Gas Monitoring

The Occupational Safety and Health Administration (OSHA) provides strict guidelines for workplaces where combustible gases are present:

• OSHA 29 CFR 1910.146 (Confined Space Entry) which requires continuous atmospheric monitoring to prevent explosion hazards in confined spaces such as storage tanks and process vessels.
• OSHA 29 CFR 1910.1000 (Air Contaminants Standard) – Mandates exposure limits for hazardous gases, protecting personnel from exposure to dangerous gas concentrations.
• OSHA 29 CFR 1910.119 (Process Safety Management of Highly Hazardous Chemicals) – Enforces rigorous controls for facilities handling combustible gases to prevent catastrophic accidents.
• NFPA 70 (National Electrical Code – NEC) – Outlines electrical installation requirements for hazardous locations.

PureAire MPS LEL Monitors: Enhancing Workplace Safety

By complying with OSHA standards and implementing advanced gas monitoring technology, businesses can:

✔ Reduce explosion risks by detecting gas leaks at early stages.

✔ Ensure regulatory compliance, avoiding fines and penalties.

✔ Protect workers and facilities through continuous real-time monitoring.

The PureAire MPS LEL Monitor, with its long-life MPS sensor, rugged NEMA 4 enclosure, and seamless integration into safety systems, is essential for facilities working with or exposed to combustible gases. Prioritize safety, compliance, and reliability by investing in PureAire’s MPS state-of-the-art gas detection technology and moving toward a safer work environment.