Questions & AnswersSign in to Start a DiscussionStart a DiscussionActive Leak Detectors Topics1RepliesWed Jul 14 2021 Random helium detections (real or instrument drift?) in the atmosphere using the PHD-4Leak Detectors Forums1 ResultSort ByPost DateLast Reply Wed Jul 14 2021Updated byluisgonzalez4286 Random helium detections (real or instrument drift?) in the atmosphere using the PHD-4 Page 1 of 1 1Ask a Question Equipment you are asking about (if applicable)SubjectEnter a question about troubleshooting, PM, buying advice and moreā¦Sign in to Submit your DiscussionSubmit your Discussion×About