A CNG circuit that leaks a little today is a circuit that leaks more tomorrow \u2014 which is exactly why testing it once at end-of-line isn’t optional. CNG Vigilant is Neometrix’s flagship automated leak testing system for complete CNG vehicle circuits and critical components: regulators, cylinder valves, nozzles, and pressure lines, evaluated under high-pressure conditions up to 350 bar. It combines pressure decay and differential pressure sensing \u2014 or, in its higher-sensitivity configuration, Helium Mass Spectrometry \u2014 with a temperature compensation system and built-in nitrogen recycling, so a production line can test every vehicle rather than sampling a few and hoping.<\/p>\n
Vigilant Ver. 0.30 pairs Pressure Decay with Differential Pressure sensing and a proprietary temperature compensation system, resolving leaks down to 1\u00d710\u207b\u2079 atm cc\/sec \u2014 fast and cost-effective for full-vehicle circuit testing and line-level verification. Vigilant Ver. 0.34 adds Helium Mass Spectrometry, pushing sensitivity down to 1\u00d710\u207b\u00b9\u2070 atm cc\/sec, aimed at precision component testing (regulators, valves, injectors) where R&D and certification work demands the extra order of magnitude.<\/p>\n
High-pressure gas testing is quietly sensitive to heat. Even a 1\u00b0C shift can create a pressure error of nearly 1 bar in a 100 cc volume at 300 bar \u2014 large enough to trigger a false leak alarm or, worse, mask a real one. Neometrix addresses this with TTLIV (Temperature-Time-Logic-Integrated-Volume) technology: circuit-specific calibration across up to 5 different circuit volumes, with software-controlled fill rates that isolate genuine pressure drops from thermal drift.<\/p>\n
CNG Vigilant runs from a plug-and-play interface with remote control up to 10 meters, one-touch test initiation, and fully customizable pressure, hold-time, and leak-limit parameters. Stepwise pressurization and flow control logic catch loose fittings or open circuits early \u2014 before the circuit ever reaches full test pressure \u2014 while audio-visual alarms flag abnormal flow behaviour mid-test.<\/p>\n
Every test cycle reclaims its nitrogen, compresses it, and stores it in a dedicated reservoir for reuse. The system supports up to 4 nitrogen cylinders simultaneously with automatic switching when one depletes, which is what keeps a high-throughput line from stopping for a cylinder change \u2014 and cuts nitrogen consumption meaningfully over a production run.<\/p>\n