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What produces ultrasound in a leak? When a gas passes through a restricted orifice under pressure, it is going from a pressurized laminar flow to low pressure turbulent flow. The turbulence generates a broad spectrum of sound. There are ultrasonic components in the sound and since the ultrasound will be the loudest by the leak site, the detection of these signals is usually quite simpe.
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Construction: Hand held ABS pistol type ultrasonic processor, stainless steel sensor enclosuresCircuitry: SMT/Solid state hybrid heterodyne receiverFrequency response: 20-100 kHz (centered at 28-42 kHz)Indicator: 10 segment leak indication LED barSensitivity selection: 8 sensitive positionsPower: 9 volt alkaline batteryLow battery indicator: LEDHeadset: - Noise isolating type: double headset wired monophonic- Impendance 16 ohms- Over 23db noise attenuation- Meets or exceed ANSI specifications and OSHA standardsTransmitter: Warble tone transmissionResponse time: 300 mille secondsAmbient operating temp: 0 -50 degrees C (32-120 degrees F)Relative humidity: 10 - 95 %