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NEW: 2-Wire Addressable Gas Detectors for ATEX and Safe Area

IGD’s 750 series gas detectors are the next step in fixed gas detection technology.

IGD’s Sentinel+™ 2-Wire protocol uses a 2 core cable for both power and data communications. Not only fewer terminations, Sentinel+™ 2-Wire protocol has no polarity requirement for its connections. Cable terminations are reduced, No polarity requirements means fewer errors and faster installs.

Advantages of  2-Wire Addressable Over Analogue:


IGD’s Sentinel+ 2-Wire protocol improves reliability. With only 2 wires for power and communication, in the same fashion existing systems can be easily upgraded without replacing cabling with the option to easily add more detectors where required.

In addition, Sentinel+™ 2-Wire protocol continuously monitors data between connected detectors and the system controller ensuring maximum system availability. Not to mention  I/O points can be easily added where required for alarm and interface to other systems, distributing the logic where it is required with minimal cabling.

Why Choose IGD’s 2-Wire Gas Detector:


When you buy an IGD product you are purchasing 100 years of know how. 750 Series 2-Wire detectors monitor for over 400 hazardous gases and vapours.

Specifically approved to the latest ATEX/IECEX standards, the 750 2-Wire series gas detectors provide ultimate safety for gas detection in hazardous areas. The system is simple to deploy by CompEx trained site electricians or instrument engineers.

If you don’t have in-house install capability then IGD can help there too, use IGD’s engineers for your install. IGD’s comprehensive range provides protection for all your gas hazards.



  • 2-Wire protocol: Only 2 core cable needed for communication and power across all detector nodes and accessories, no polarity

  • Up to 70% saved on install costs: Moreover with only 2 core cables needed for operation, you can save up to 70% on wiring and installation costs

  • Upgrade Existing Systems: With only 2 core cables any existing systems are easily upgraded with 2 wire ATEX gas detectors and accessories

  • IECEX/ATEX Approved 

  • Easily add more: 2 wire ATEX gas detector nodes or accessories when required

  • Broad range of gases detected 

  • Communicate Up to 3km

  • App based service tools

  • Pre-calibrated 

  • Intelligent Diagnostics via Connected Controller, 2 models available

Why is it the “Safety Engineers Device of Choice”:

  • Pre-calibrated: ready to use and directly connected to the TOCSIN 750/650 2-wire series control panels

  • Only 2 wires: Allows communication over the power cables, No required Polarity

  • 2 core cable: Save up to 70% on installation costs

  • Easily upgrade existing systems: Using the existing power cables

  • Easily add: more detectors and accessories where required

  • Multiple I/O: as standard with each detector, solid state and relay outputs, digital and analogue inputs

  • Mixture of detectors: With 2-Wire you can utilise a mixture of safe area and ATEX/IECEx devices. In addition to this add I/O cards, illuminated signs and audible visual alarms.

  • App Controlled: IGD service apps Service decrease service time. In addition to this we also have an Event Viewer, where end users can monitor their gas detection system, through an android device.

Available Sensor types

  • Infra Red

  • Pellistor

  • Electrochemical

Gas Detected

  • Ammonia

  • Carbon Dioxide

  • Carbon Monoxide

  • Chlorine

  • Ethylene

  • Ethylene Oxide

  • Formaldehyde

  • Hydrogen

  • Hydrogen Chloride

  • Hydrogen Cyanide

  • Hydrogen Fluoride

  • Hydrogen Sulphide

  • Nitric Oxide

  • Nitrogen Dioxide

  • Oxygen

  • Ozone

  • Silane

  • Sulphur Dioxide

  • Boron Tri-Chloride

  • Flammables

  • Volatile Organic Compounds

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