Which of the following leak detectors would...

Question 1 of 292185eccef9ebacbc34ba4d46197

Which of the following leak detectors would be appropriate for use in detecting leaks on a system currently in a vacuum? See illustration RA-0004.

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Question 1 of 29218

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Which of the following leak detectors would be appropriate for use in detecting leaks on a system currently in a vacuum? See illustration RA-0004.

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🔍 Key Concepts

• System under vacuum means air is leaking in, not refrigerant leaking out • Some leak detectors need refrigerant or gas pressure to sense escaping vapor, others detect sound (ultrasound) of a leak • Compare tools that sniff gas versus tools that listen for leaks

💭 Think About

• If the system is in a vacuum, what is actually moving through a leak – refrigerant out or air in? How does that affect which detector can work? • Which pictured devices rely on sensing refrigerant or a flame reaction, and which rely on sound picked up through a microphone or headset? • Look closely at the shapes: which look like electronic “sniffers,” and which look like listening devices with cones or headsets?

✅ Before You Answer

• Verify which options are gas/refrigerant leak sniffers that need refrigerant pressure to escape • Identify which option(s) are ultrasonic/acoustic detectors that can work with air being drawn into a vacuum • Before choosing, ask: "Would this detector still work if there were no refrigerant in the line, only vacuum?"