Introduction:

Ultrasonic technology has been around since early 1930's. For many years, detecting combustible gas leaks has been accomplished through the use of catalytic bead and infrared point detectors along with open path infrared perimeter detectors In past 20 years, ultrasonic sensing has become the leading standard in many different industries, including gas measurement for custody transfer and, of course, leak detection.

Advantages to using ultrasonic leak detectors:

  • ƒ. It Detects gas leak before a hazardous concentration is present

  • ƒ. Suitable for all weather conditions

  • ƒ. The gas cloud no contact with the sensor during Operation.

  • ƒ. Detection is instantaneous for all types of gas leak (toxic or combustible)

  • ƒ. Not affected by wind direction and noisy environments (audible noise is not an issue)

  • ƒ. Wide area coverage with a single unit (up to 40 meter radius)

  • PMS - Uncoated

Challenges

  • ƒ. Not suited for low pressure application (below 30 psi).

  • ƒ. Cannot distinguish gas types leaking, e.g. air/nitrogen/methane

  • ƒ. Time delays need pre configured for press releases, etc

There are only two types of ultrasonic leak detectors on the market today. The first utilizes traditional ultrasonic sensing technology through the use of a moving metal diaphragm (microphone) that requires frequent calibration and periodic replacement. Because of its design, mounting orientation is also limited and it can be affected by temperature changes. This unit also has a single sensor element that covers a max range of a 12 meter radius with medium background noise

The latest ultrasonic sensing technologies uses a resonant sensor. The active element is a piezo-electric material(which converts mechanical deformation into electrical voltage) embedded in a ceramic medium. These sensors have an extremely high chemical resistance and a wide frequency range response band. The unit can be mounted in any orientation required for the application. Its sensor design has no moving parts so wear and tear is completely eliminated. Detector design come with four sensors, which covers a max range of 40 meters radius. After Factory Calibration, It will be Lifetime usage and there is no zeroing or calibration required.

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