MLD-3500 Gas Leak Detector

The Gastech MLD-3500-E ATEX is a professional ATEX-certified portable gas leak detector covering a dual measurement scale — PPM and VOL (percentage by volume) — with %LEL percentage readout available during leak search operations. The instrument carries ATEX marking II 2G Ex db ib IIB T4 Gb, rated for ambient temperatures from 0°C to +50°C, approving it for direct use in classified explosive atmosphere zones across live gas network environments. The unit is calibrated to Methane (CH4) and features high-sensitivity, high-repeatability solid-state sensors, automatic scale switching across all measurement ranges, and a large graphic display with a simple, intuitive six-button menu interface. The standard supply kit (product code EA.0050.0010) includes the multi-function probe kit with filter (Art. EA.0010.8050), packed inside a rugged yellow foam-lined carry case alongside the instrument body and probe accessories.

The measurement range runs from 1 ppm to 100% VOL with automatic scale switching — the instrument transitions from PPM through %LEL to %VOL readout as gas concentration rises, without any manual range intervention from the operator. This differs from the MLD-4500 BT-EX in that the MLD-3500-E does not include a standalone explosimeter function or Bluetooth data transfer — it is purpose-optimized for gas leak pre-location, location, and classification in field conditions. The automatic scale change keeps the display readable and accurate at every concentration encountered during a leak investigation from first detection to full source identification. Five optional probe configurations are available — road-surface carpet probe, borehole point probe, bell probe, rigid telescopic indoor probe, and flexible telescopic indoor probe — covering every access requirement from road-surface surveying to confined indoor tracing.

The Gastech MLD-3500-E ATEX is deployed by gas network emergency response technicians, on-call intervention crews, fire brigade USAR teams, and civil protection units for pre-location, location, and classification of gas leaks on both above-ground and buried methane pipelines. Its ATEX certification allows deployment directly in live gas atmosphere zones, making it suitable for immediate response from the moment of arrival at an incident site — without requiring instrument substitution before entering the leak zone.

Leader Infra supplies this ATEX-certified dual-range gas leak detector for gas network operators, emergency response teams, and civil protection units — delivering auto-ranging detection from 1 ppm to full volume percentage in a single rugged field instrument approved for direct use inside classified explosive atmosphere zones.

FAQ — What is the operational difference between the MLD-3500-E and the MLD-4500 BT-EX? The MLD-3500-E is calibrated to Methane only and does not include a standalone explosimeter function or Bluetooth data transfer. The MLD-4500 BT-EX adds dual CH4/C3H8 calibration options, a dedicated explosimeter function for %LEL measurement independent of leak search mode, and BLE 4.2 wireless data transfer for real-time logging. The MLD-3500-E is the purpose-optimized, lower-complexity choice for standard methane leak search operations, while the MLD-4500 suits multi-gas environments and data-logging requirements.