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LEL Monitor List Canada, LEL Gas Detectors

Lower Explosive Limit (LEL): An LEL Monitor detects the lowest amount of a gas or vapour in air that can ignite and cause an explosion (flash), when present with an ignition source (arc, flame, heat etc).

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    • Temperature Sensor with Integrated Transmitter
Combustible Gas Detector (LEL) – A12-17, 3 Wire Combustible Gas Transmitter

Combustible Gas Detector system eliminates the need for frequent response checks with ATi’s pioneering AutoTest. This transmitter performs an automatic test using self-generated gas on the sensing element every 24 hours with the world’s only self-testing AutoTest gas module for complete peace of mind, allowing for safer and more confident monitoring. The A12-17 combustible gas sensors are made up of two matched sensing elements, one active and one passive. Both are electrically heated and form two legs of a Wheatstone…

IR Infrared Gas Transmitter, Combustible Gas LEL or CO2 Detection

Detection of combustible levels of methane or other hydrocarbons % LEL. It may also be used for monitoring CO2 levels, either in ppm or percent levels. D12Ex-IR infrared gas transmitters provide analog signals for remote interface and optional relays for local alarming functions. Two digital communication options, Modbus™ and Hart™, are also available. Certified for use in explosion hazard areas, the unit provides rapid and reliable detection of hazardous conditions so that protective measures can be activated. The D12Ex-IR is…

Wet H2S Gas Detector | Continuous H2S Monitoring in Wet Conditions

Wet H2S gas monitor is a new type of gas sensor technology that allows continuous monitoring of hydrogen sulfide in both inlet and discharge air, where condensing humidity conditions are normal. Measurements may be either at the inlet to scrubber systems where gas concentrations can run as high as 200 PPM or at the outlet, where gas concentrations are ideally down below 0.5 PPM. Special gas sensor configurations are available for either duct insertion or flowcell use. As Q45S Wet…

High Level Ammonia Gas Detector | IR Infrared

ATi’s E12-15 IR Infrared High Level Ammonia Gas Detector is a rugged, reliable, microprocessor-based, intelligent gas detector. The E12-15 IR can be used to monitor from PPM levels to explosive levels of ammonia gas. The E12-15 IR is ideally suited for use in harsh environments where electrochemical sensor life can be short. Areas such as engine rooms, emergency vents, or other high level NH3 areas are excellent applications. The E12-15 IR Infrared Gas Detector will perform reliably in the presence…

Modular Gas Detector

A14/A11 Modular Gas Detector is a flexible component system providing a variety of options to meet individual gas detection and alarm requirements. From chemical and petrochemical plants to food processors, this economical and low maintenance system can be applied to the simplest or most complex gas detection application and is the best choice for reliable gas leak detection. The A14/A11 GasSens gas detection systems consist of individual modules that can be located where required. Sensor transmitters, located in the area…

Portable Gas Leak Detector, Hand-Held PortaSens Battery Powered Detector

Locating the source of gas leaks can be a challenge, especially in plant areas with multiple potential leak sources. Ammonia refrigeration piping, ozone generator skids, and hazardous gas piping systems are just a few of the applications where identifying exact leak sites is difficult ATI’s new PortaSens III portable leak detector (Model D16) is ideal for locating leak sources or simply for measuring gas concentrations in the workplace. With a built-in sampling pump and inlet wand, sample is drawn from…

Wet Gas Detector – Accurate Gas Measurement in Wet Gas Streams

B12 Wet Gas System was developed to meet the need for reliable measurements in wet scrubber outlets for other gas streams that might be saturated with water vapor. Systems have been developed for monitoring strong oxidants (chlorine, bromine, chlorine dioxide, or ozone), acid gases (HCl or HF), and hydrogen. The basic B12 Wet Gas System consists of a loop-powered 2-wire transmitter and a corrosion resistant sensor specifically engineered to operate at 100% RH.

Toxic Gas Detector Measure More than 60 Toxic Gases

ATI’s Series F12/D provides a high level of confidence that your system is functional at all times. Our Auto-Test feature provides an actual gas “bump test” every 24 hours, verifying system integrity. Not an electronic test of some kind but a true test of sensor response to gas. ATi’s F12D Toxic Gas Detector is designed to measure more than 60 toxic gases, featuring the exclusive AutoTest* function that provides daily, reliable response checks to ensure system integrity. The F12D is…

4 Gas Calibration Gas

4 Gas Calibration Gas Available in multiple variations to meet your needs. H2S, Methane or Pentane, CO, O2 The best pricing in the industry with fast delivery Call Contact Home  >  Calibration Gas  > 4 Gas Calibration Gas Description Specification Accessories Downloads The Best Pricing in the Industry & Fast Delivery for 4 Gas Calibration […]

H2S Calibration Gas – Hydrogen Sulfide Cal Gas

H2S Calibration Gas – Hydrogen Sulfide Cal Gas Calibration Gases The best pricing in the industry with fast delivery Call Contact Home  >  Calibration Gas  > H2S Calibration Gas – Hydrogen Sulfide Cal Gas Description Specification Application Accessories Downloads The Best Pricing in the Industry & Fast Delivery for H2S Calibration Gas from Canada. Available […]

Bump Test Gas – 4-Gas Monitor Calibration Gas

Bump Test Gas – 4-Gas Monitor Testing. Bump Test Gases The best pricing in the industry with fast delivery Call Contact Home  >  Calibration Gas  > Bump Test Gas Description Specification Accessories Downloads The Best Pricing in the Industry & Fast Delivery for Bump Test Gas from Canada. Bump Test Gas for 4-Gas monitors includes; […]

Carbon Monoxide Calibration Gas – CO Cal Gas

Carbon Monoxide Calibration Gas – CO Cal Gas Carbon Monoxide Calibration Gases The best pricing in the industry with fast delivery Call Contact Home  >  Calibration Gas  > Carbon Monoxide Calibration Gas – CO Cal Gas Description Specification Accessories Downloads The Best Pricing in the Industry & Fast Delivery for Carbon Monoxide Calibration Gas from […]

Methane Calibration Gas – Methane Cal Gas

Methane Calibration Gas – Methane Cal Gas Methane Calibration Gases The best pricing in the industry with fast delivery Call Contact Home  >  Calibration Gas  > Methane Calibration Gas – Methane Cal Gas Description Specification Application Accessories Downloads The Best Pricing in the Industry & Fast Delivery for Methane Calibration Gas from Canada. Available in […]

Meridian Universal Gas Detector

Meridian Universal Gas Detector Teledyne The Meridian Universal Gas Detector is one detector with global approvals and a plug-and-play design, for toxic and combustible gases including; Chlorine, ClO2, Methane & 57 other gases. Call Contact Description Specification Application Options F.A.Q Meridian Universal Gas Detector – Multiple Sensors The Meridian universal gas detector allows up to […]

Understanding LEL Detection

Gas mixtures are considered “too lean” to burn when present in air at a concentration below the Lower Explosive Limit (LEL). In theory the LEL of methane gas is 4.4% of atmospheric air. Even in the presence of an ignition source, an explosion cannot happen below the LEL of 4.4% of methane in air. However, if an LEL monitor detects levels above the 4.4% threshold, it will trigger an over limit condition which in turn may trigger other actions such as alarms, visual beacons and automatic ventilation systems. Workers will be instructed to leave the area immediately upon hearing any alarms.

Which Industries Use LEL Monitors

The primary users of an LEL Monitor, are the Oil and Gas industries, but they are used in any situation where explosive gases can concentrate to dangerous levels. To keep workers safe over the course of their shift, it is essential to be able to detect potentially explosive gases and alert workers of the danger.
The use of  Lower Explosive Limits monitors, or LEL monitors, to do this is essential.

These gas detectors are essential components of any industrial safety plan, because they are made to detect flammable gas levels before they rise to dangerous levels that might cause fires or explosions.

They are used in a number of contexts, including offshore oil drilling platforms, gas pipelines, and in refineries or industrial plants.

Different types of LEL Gas Detection

LEL monitor (s) can be divided into systems and detection methods. The main systems are fixed gas detectors and a personal (portable) gas monitor. Other systems include inline gas detection and portable leak “sniffers”.

The two main detection methods are IR (infrared) LEL Sensors and catalytic ‘Wheatstone bridge’ (sometimes call Catalytic-bead or Cat-bead sensors). First impressions would suggest that IR sensors are the best options as they  are more reliable, cheaper and lower powered, but further investigation will show that each type has it’s advantages and disadvantages.

Catalytic-bead Sensors: LEL Gas detection by catalytically oxidizing the gas on an active bead located within the sensor which is registered by the instrument as a change in electrical resistance.

The temperature of the active bead must be high enough for the gas to be oxidized which leads to higher power consumption to heat the bead area. Catalytic LEL sensors also require the presence of oxygen. Typically, LEL sensors cannot be used if the concentration of oxygen O2 is less than 10%. Therefore this is one limitation to their use and where an IR sensor will be required.

Catalytic-bead sensors respond to a wide range of flammable gases and vapors. However, they can be “poisoned” by the presence of sulfur, phosphorus, or vapors that contain silicones.

IR (infrared): The three main benefits of an IR sensor are, lower power consumption, operation in low oxygen environments and the inability to be poisoned. IR sensors can also differentiate between different target gases.

A disadvantage is they cannot detect some combustible gasses like Hydrogen.

Regardless of the sensor chosen, it is important to understand which target gasses can potentially be present and ensure that your detector is able to monitor them safely.

Looking at a broad comparison, a catalytic bead sensor is usually calibrated to detect methane and sometimes propane. It can then be “corrected” to detect other types of gases. Generally speaking a catalytic bead sensor will react to a wide range of combustible gasses. An IR sensor is calibrated (usually at the factory) to detect a narrow range of specific gas types, so does not “see” other gases. It cannot see some gasses like Hydrogen or acetylene.

Correct selection will depend on the environment where the sensor will be located.

How to Calibrate an LEL Gas Detector

Each LEL meter, LEL monitor, LEL sensor and  LEL gas detector will have different menu systems to facilitate calibration. Refer to each instruments manual and ensure the correct procedure is followed. However, each process will follow the same basic goal. The calibrate the most common target calibration gas used is Methane. A calibration gas bottle will be used with a regulator and tubing to deliver a known amount of methane to the instrument. A test is then performed to establish if the instrument “sees” the target gas and responds correctly. Adjustments, replacements or maintenance is then performed as required.