Using ultrasonic probe to monitor gas inside process fluid as it passes through sealless magnetic drive pump, VapourView provides early warning of incorrect priming, venting, cavitation, or entrained process gas. Warning signal is sent to process operator when ultrasonic probe detects presence of even minute gas levels — as low as 1% per volume. Operating from -40 to 356°F, system includes non-invasive detection sensor, flameproof electronics, onboard data recording, and local visual display.