An Open Path Gas Detector is employed for detecting gas leaks over a particular distance rather than a point. It operates by sending a beam of infrared or laser light between a transmitter and a receiver. If there is the presence of gas in the open path, the gas absorbs some of the light, and the measurement of the reduced light is taken to determine the gas concentration. It is normally indicated in ppm-meters.
This type of detection is best used in open spaces or large industrial areas where gases can be distributed quickly. As opposed to point detectors, where detection is possible when gases reach a point, this system monitors gases over its entire beam length. This gives a higher chance of detecting gases early, even when they are distributed by air currents.
Open Path Gas Detectors are widely used in the oil and gas industries, chemical industries, refineries, and storage terminals. In such industries, there are areas like pipelines and open spaces where the detectors may not be able to provide full protection. With the detectors having the ability to detect gases over a range of up to several hundred meters, fewer detectors are needed.
Installation is vital for the correct performance of the device. It is necessary that the transmitter and receiver are correctly aligned with each other and that the beam is not blocked in any way. While weather conditions like fog, dust, and rain may interfere with the intensity of the signal, there are usually provisions made in the device to accommodate such conditions.
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In selecting an Open Path Gas Detector, it is important that the range is appropriate to the layout of the site. A longer range can detect over a wider area but must be precisely aligned. It is also important that the gas detector is suitable for the type of gas being detected, as this gas will absorb different wavelengths of light.
Sensitivity is a critical factor in ensuring detection accuracy. It is important that the system is able to detect even low concentrations of gases and at the same time not produce false alarms. It is also important that adjustable alarm thresholds are provided to meet safety requirements.
Another factor that has to be taken into consideration is the durability of the equipment. In this case, the equipment has to be able to withstand temperature fluctuations and moisture. In some instances, they are made to be explosion-proof to meet certain requirements.
The maintenance requirements of the equipment are also another factor that has to be taken into consideration. Although it is evident that open path detectors require little maintenance in terms of recalibration compared to point detectors, proper maintenance is still a requirement to ensure that proper alignment is achieved and that all surfaces are clean.
The equipment has to be able to connect well with existing safety systems to ensure that proper response is achieved in case of a gas leak.
