Which of the following leak detectors would be appropriate for use in leak detecting on a system currently pressurized with nitrogen? Illustration GS-RA-04

Correct Answer: Option D — D

Electronic leak detectors or bubble solution methods are utilized when pressure-testing with dry nitrogen. Because nitrogen is an inert gas, halogen-specific electronic sensors or ultrasonic detectors are required to locate pressure boundaries reliably during pre-charge tightness tests.