GMI GS700

The GMI GS700 portable infrared gas leak detector is designed around gas utility and network operator requirements. Its core infrared sensing delivers rapid response for both LEL and volume measurements of flammable gas, supporting tasks from trace leak localisation through to high-concentration purging work. Hydrogen-ready variants provide simultaneous methane and hydrogen measurement together with Pipeline Gas Test (PGT), helping operators manage current natural gas networks while preparing for hydrogen blends and future decarbonised grids.

Optional electrochemical sensors for oxygen, carbon monoxide and hydrogen sulphide, plus an internal PPM flammable semiconductor sensor, extend the GS700 into toxic gas monitoring and high-sensitivity leak pinpointing. This flexibility allows standardisation on a single detector platform across routine survey work, incident investigation and safety checks.

The GS700 incorporates multiple dedicated operating modes, including Gas Leak Outdoors, Purge, Search, Barhole and Confined Space. Each mode configures alarms, ranges and behaviour to suit the task, helping reduce key presses and support consistent practice across teams. A configurable Barhole Mode is specifically optimised for locating underground leaks, supporting barholing workflows with targeted measurement and structured logging.

Natural gas discrimination enables the GS700 to distinguish pipeline natural gas from naturally occurring biogas, supporting clearer decision-making in complex field environments. Combined with the PGT function, this assists in classifying gas sources and documenting investigations to regulatory standards.

An antistatic polycarbonate ABS housing with conductive TPE over-moulding gives the GS700 a robust yet lightweight construction suitable for daily use in demanding conditions. Ingress protection up to IP55 resists dust and water jets, and the detector operates across a wide temperature and humidity range, supporting year-round outdoor deployment.

The integral pump with flow-fail sensor maintains a reliable sample draw and provides clear indication of sampling issues. Hydrophobic and cotton filters protect the sample path from moisture and dust, supporting sensor stability and reducing contamination-related downtime, particularly during barholing and work on contaminated ground.

The GS700 is engineered for visibility in challenging sites such as roadside works, compressor compounds and confined spaces. A 360° LED alarm system provides all-round visual warning, supported by a loud audible alarm to cut through background noise. The monochrome LCD with automatic backlighting maintains legibility in low light, at night and in enclosed spaces, helping ensure readings and alarms remain easy to interpret.

A simple four-button soft-key interface supports straightforward operation and short familiarisation time for new users. Predefined configurations, such as PPM/LEL/Volume combinations with common toxic gas options, simplify fleet specification and reduce configuration errors. First Responder feature sets are available for emergency teams requiring rapid deployment and broad coverage in unplanned scenarios.

The GS700 can be supplied with either alkaline or rechargeable battery packs to match site preferences. Typical runtimes support full-day shifts, and rechargeable variants offer a fast turnaround between deployments with a short recharge time, helping to keep shared pool instruments available.

Comprehensive intelligent data logging with capacity for 500 session logs turns each GS700 into a detailed record of field activity. Logs can include user identification, time and date, gas readings, alarms, calibration and bump records, barhole data and PGT results, providing a structured audit trail for leak surveys and incidents.

Optional GPS mapping adds location and timestamp information to measurements and alarms for clearer investigation mapping. Data can be extracted via infrared (IrDA) and, where fitted, Bluetooth wireless transfer. Integration with a cloud-based Instrument Management System (IMS / GDCloud) provides central access to usage history, calibration status, investigation records and compliance reporting, supporting fleet oversight and audit readiness.

The GMI GS700 holds hazardous area approvals including ATEX, IECEx and CSA for Class I Division 1 locations, together with CE marking for EU regulatory compliance. This approvals portfolio enables use in potentially explosive atmospheres across multiple regions and supports organisations in demonstrating adherence to relevant gas safety and environmental requirements when combined with the instrument’s detailed logging capabilities.

A broad range of probes, filters and accessories enables the GS700 to support different survey and investigation techniques using a standard detector platform. Complete kits can include carry case, probes, filters, tubing, harness and charger, simplifying roll-out for new teams and projects while reducing the need to manage multiple instrument types.

Each GS700 is configured to order to match specified sensors, feature sets and accessories, reflecting its role as a tailored fleet instrument; as a result, units are not eligible for cancellation or return once built. Purchase and hire options support both long-term capital deployment and short-term project or outage needs, while multi-language support and user-specific settings make the platform suitable for international fleets. A 2-year warranty underpins lifecycle planning, and collaboration with UK gas utilities during development ensures the GS700 aligns closely with established field practice.