General Monitors’ Gassonic Observer-H ultrasonic gas leak detector (Fig. 1) is suitable for use in pressurized systems and is ATEX, IECEx, FM, and CSA hazardous area certified. It senses the airborne ultrasound emitted by gas leaking at high pressure. Since the detector responds to the source of a gas release rather than the dispersed gas, it is unaffected by changing wind directions, gas dilution, and the direction of the leak. It detects leaks at a frequency range from 25 to 70 kHz at a dynamic range from 58 to 104 dB. Detection coverage varies from 13 to 20 m in radius in very low noise areas (<58 dB), from 9 to 12 m in radius in low noise areas (<68 dB), and from 5 to 8 m in radius in high noise areas (<78 dB). The distances are defined for a methane gas leak of 0.1 kg/s. The detector operates at a temperature range from −40°F to 140°F and at a range of relative humidity from 10% to 95%.
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