MLD-3500H Rilevatore Tracer Gas

The Gastech MLD-3500H Tracer Gas Detector is a portable hydrogen (H2) leak detection instrument built around a solid-state semiconductor sensor with selective hydrogen response. The measurement range spans 1 ppm to 5% VOL, covering the full spectrum from trace-level leak detection through to significant concentration identification in a single instrument. The unit features a large graphic display, a simplified menu structure, and a compact rectangular body — identifiable in the image by the white panel with large graphic LCD and six direct-access function buttons. The standard supply includes the multi-function probe kit with filter (Art. EA.0010.8050), which covers multiple sampling configurations from a single probe set. Optional accessories include a bell probe, road-surface carpet probe, and flexible telescopic indoor probe. Product code: EC.0020.0010. The instrument applies across the Gas Metano e GPL, Acqua, and Gestione Fogna & Spurghisti product families.

The hydrogen-selective semiconductor sensor detects H2 with high sensitivity from 1 ppm, making the instrument capable of identifying very small leaks that fall below the detection threshold of conventional pressure-decay hydraulic or pneumatic testing methods. Because hydrogen is used as a tracer gas — typically a 5% H2 / 95% N2 mixture injected into an empty pipe under test — the instrument can locate the specific point of leakage along a pipeline without requiring the pipe to be filled with water or pressurized to high test pressures. This makes it particularly suitable for polyethylene water pipelines where acoustic leak detection methods produce no useful signal, and for any new pipeline that repeatedly fails hydraulic or pneumatic commissioning tests without an identifiable source.

The Gastech MLD-3500H Tracer Gas Detector is deployed by water network operators, gas network installers, sewer contractors, and drainage maintenance teams whenever a standard hydraulic or pneumatic pressure test fails and the leak position cannot be located by conventional methods. It is used on new polyethylene water pipe installations, new gas pipeline sections, and sewer pipe systems — wherever injecting a hydrogen tracer gas mixture allows surface-level detection of a leak exit point that pressure measurement alone cannot locate.

Leader Infra supplies this hydrogen-selective tracer gas leak detector for gas, water, and sewer network operators — delivering surface-level leak point identification on empty pipes across all pipeline materials and diameters where conventional acoustic or pressure-based methods cannot be applied.

FAQ — Why is a 5% hydrogen / 95% nitrogen mixture used as the tracer gas instead of pure hydrogen? Pure hydrogen at concentrations above 4% in air is flammable. The 5% H2 / 95% N2 mixture keeps the hydrogen concentration within the inert nitrogen carrier below its lower flammable limit in any realistic leakage scenario at the pipe surface, making the tracer gas itself non-flammable during injection and surface sampling — while still providing a hydrogen concentration in the escaping gas that the MLD-3500H sensor can detect at 1 ppm sensitivity.