EPA 608 Core · Leak Detection · Medium
When searching for a leak with an electronic detector, how should the probe be moved?
Answer: D. Slowly, just below each joint.
- AQuickly, above each joint.
- BOnly around the compressor.
- CHeld still in the middle of the room.
- DSlowly, just below each joint.✓ Correct
Why D is right
Most refrigerant vapor is heavier than air, so it sinks from a leak. Moving the probe slowly just below each joint gives the sensor time to react.
More Core questions
- What gas should be used for safely pressurizing a system to leak test?
- Which leak detection method is best for pinpointing an exact leak location?
- What is a 'trace gas' used in leak detection?
- What is the most effective way to detect a massive system leak quickly?
- How does an ultrasonic leak detector find a leak?
Go deeper with the study guide AIM Act 2026: The HFC Leak Repair Rules for HVAC Techs, try the free 10-question test or browse all EPA 608 practice questions.
A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.