MLD-4500 Gas Leak Detector

The Gastech MLD-4500 BT-EX is a professional ATEX-certified portable gas leak detector covering a full three-range measurement scale — PPM, LEL (Lower Explosive Limit percentage), and VOL (percentage by volume) — from a single instrument. The unit carries ATEX marking II 2G Ex db ib IIB T4 Gb, rated for ambient temperatures from 0°C to +50°C, making it approved for use in classified explosive atmosphere zones including live gas network environments. Calibration is available in Methane (CH4) and/or Propane (C3H8) to match the operator’s gas type. The instrument features high-sensitivity, high-repeatability solid-state sensors, automatic scale switching across measurement ranges, a large graphic display, and Bluetooth Low Energy 4.2 (BLE) for real-time wireless data transfer. Product code: EA.0055.0001. The system ships in a rugged orange carry case with foam insert, and a separate shoulder-strap yellow data logger unit is included for field recording.

The automatic scale switching function transitions the readout from PPM to %LEL to %VOL as gas concentration rises during a leak investigation — with no manual range intervention required by the operator. This is critical in emergency response conditions where operator attention must remain on locating the source rather than managing the instrument. The BLE 4.2 wireless data link transmits concentration readings in real time to a companion device or data logger without a physical cable connection. Five optional probe types are available — road surface carpet probe, borehole point probe, bell probe, rigid telescopic indoor probe, and flexible telescopic indoor probe — plus a multi-function kit probe with filter, covering every application from road-surface pre-location to indoor installation tracing.

The Gastech MLD-4500 BT-EX is deployed by gas network emergency response technicians, on-call intervention crews, and utility field operators for pre-location, location, and classification of gas leaks on both above-ground and buried pipelines. It covers the full response workflow from initial road-surface survey through borehole confirmation sampling and indoor installation tracing in a single instrument. Its ATEX certification allows deployment directly in live gas leak zones without instrument substitution during the investigation.

Leader Infra supplies this ATEX-certified, three-range gas leak detector for gas network operators and emergency response teams — delivering continuous auto-ranging detection from trace PPM levels through explosive concentration to full volume percentage in a single Bluetooth-enabled field instrument.

FAQ — What does automatic scale switching mean in practical terms for a gas leak investigation? When a technician approaches a leak source, gas concentration in the sample point rises rapidly from trace PPM levels to potentially explosive LEL percentages and above. Automatic scale switching changes the displayed measurement range without any operator action — the instrument handles the transition from PPM to %LEL to %VOL automatically, allowing the technician to focus entirely on tracing and classifying the leak source without interrupting the investigation to manually adjust the instrument range.