Open Path Gas Detectors

About Open Path Gas Detection Technology

How to determine the right products for your toxic and hydrocarbon gas monitoring needs.

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Principles of Open Path Gas Detection

Open path gas detectors rely on the unique spectral fingerprint of each chemical substance. In an open path gas detection system, a source unit emits a high energy beam of a specific wavelength. The target gas will absorb some of the irrigated energy and emit the rest. The detector unit detects the emitted energy at specific spectral bands, according to the target gas. This enables rapid gas leak detection for hydrocarbon or toxic gases.

How It Works

Gas Detection Uses

Gas detectors have many uses. They are used to protect people from harm, through early warnings about dangerous levels of toxic and hydrocarbon gases. These warnings allow action to be taken before the levels become harmful. Gas detectors also prevent damage to assets or explosions, by allowing processes to be shut down when hydrocarbon gas levels are rising. In addition, gas detectors often assist in meeting insurance requirements, as many insurance companies require gas detectors to be installed in order to operate a facility.

Toxic Gas Detection

Toxic gas detectors detect toxic gases, including Ammonia and Hydrogen Sulfide. These gases have an absorption in the UV spectral band of 0.2u or 0.3u.

The detector’s source unit emits UV radiation and the detector unit receives radiation signals, which are then processed by a microprocessor.  When the open path detector detects the presence of a toxic gas in the atmosphere, a warning or alarm is initiated. Action can then be taken to shut down equipment before the atmosphere contains a harmful level of gas. This protects personnel from harm.

Hydrocarbon Gas Detection

A combustible gas detection unit is sensitive to hydrocarbon gases. These gases have an absorption in the IR spectral band of 2.3µ or 3.4µ.

The detector’s source unit emits IR radiation. The detector unit receives these signals, which are then amplified and processed. The absorption of radiation is analyzed and compared a reference level. If a combustible gas is detected, a warning or alarm occurs.

Combustion requires a source of ignition, oxygen, and fuel in the form of a combustible gas. Detecting combustible gases at an early stage provides effective fire prevention.

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