Sensitron SMART 3G-GR1

The Sensitron SMART 3G GR1 is a fixed gas detector certified for ATEX Group 1 - equipment classified for use in underground mining environments and areas susceptible to firedamp. It detects methane (CH₄), carbon monoxide (CO), and oxygen (O₂) using catalytic, infrared, or electrochemical sensors, and carries SIL2 (hardware) / SIL3 (software) certification.

The GR1 is available with or without a 4-digit illuminated display and outputs a standard 4–20 mA signal, with optional relay outputs and RS485 / Modbus communication.

Key Advantages:

ATEX Group 1 certified for underground mining and firedamp-susceptible areas
Detects methane (CH₄), carbon monoxide (CO), and oxygen (O₂)
Available with or without 4-digit illuminated display
SIL2 / SIL3 rated for functional safety requirements
Standard 4–20 mA output with optional 3-relay output card
Optional RS485 / Modbus communication
Continuous self-diagnostics with zero follower drift compensation

Request a quote for the Sensitron SMART 3G C3

Detectable gases

The SMART 3G GR1 is available in sensor-specific variants matched to the target gas. The gas type and sensor must be confirmed at time of order.

Catalytic sensor: Methane (CH₄) and other flammable gases

Infrared (IR): Methane (CH₄)

Electrochemical cell: Carbon monoxide (CO), oxygen (O₂)

ATEX Group 1 Gas Detection - What It Means and Where It Applies

ATEX equipment classification distinguishes between Group 1 and Group 2 products. Group 2 - which covers the majority of surface industry detectors including the SMART 3G D2, C2 LD, and C3 - is for surface installations where flammable gas, vapour, or dust may be present. Group 1 is a separate and more specific classification covering equipment intended for use in underground mines and installations susceptible to firedamp.

Firedamp is the term for methane gas that accumulates naturally in coal and other mining environments. It is highly flammable and, in combination with oxygen, poses a significant explosion risk. Carbon monoxide is also a mining hazard, produced by incomplete combustion and oxidation of coal. Oxygen monitoring is required to detect both depletion and enrichment conditions.

The SMART 3G GR1 is designed and certified specifically for these conditions. It is not a direct substitute for Group 2 surface detectors and should only be specified for Group 1 classified environments.

Group 1 vs Group 2 - Selecting the Correct ATEX Classification

A common source of confusion in hazardous area gas detection is the distinction between ATEX Group 1 and Group 2. Here is a plain summary:

Group 1 - equipment for underground mines and firedamp-susceptible areas. The SMART 3G GR1 is certified Group 1.

Group 2 - equipment for surface industry hazardous areas, subdivided into Zone 1 (Category 2) and Zone 2 (Category 3). The SMART 3G D2 and C2 LD cover Zone 1; the SMART 3G C3 covers Zone 2.

Group 1 and Group 2 certifications are not interchangeable. The correct classification must be confirmed by the hazardous area assessment for the specific installation before equipment is specified.

If you are unsure which product applies to your application, contact our technical team and we will advise based on your installation type and site classification documentation.

Have a question about the Sensitron SMART 3G GR1?

Our technical team can help you confirm whether the GR1 is the correct product for your installation, advise on sensor configuration, and provide pricing and availability.

For technical questions

Martin Søvind Jensen

Tel: +45 2761 4502

Email: Marine@insatech.com

Write to Martin

For commercial inquiries

Our team of Sales Specialists

Tel.: +45 5537 2095

Email: quotes@insatech.com

Worldwide delivery from Insatech

Insatech delivers products to customers worldwide, supporting both individual product orders and ongoing supply needs for businesses, resellers, and agents.

We regularly supply customers across Europe, North America, the Middle East, and Asia-Pacific, including Germany, Spain, Italy, the USA, Canada, the UAE, Singapore, the Netherlands, the United Kingdom, Greece, India, Hong Kong, France, Norway, Sweden, Poland, Latvia, Japan, Portugal, Cyprus, Belgium, and Australia.

With reliable international delivery and experience handling global orders, we help ensure that the products you need can reach you wherever your business is located.

See how we deliver worldwide

We Deliver Directly to End Customers, Resellers, and Agents – Globally

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Technical Specifications
ATEX classification	Group 1 (underground mining / firedamp)
Gas types detected	Methane (CH₄), carbon monoxide (CO), oxygen (O₂)
Sensor technologies	Catalytic bead, infrared (IR), electrochemical cell
Output signal	Standard 4–20 mA (3-wire)
Relay outputs	Optional 3-relay output card
Communication	Optional RS485 / Modbus protocol
Display	Optional 4-digit illuminated display + 5 status LEDs
Calibration	Standard calibration procedure
Self-diagnostics	Continuous
Drift compensation	Zero follower function
ATEX standard	EN IEC 60079-0:2018, EN 60079-1:2014
ATEX directive	2014/34/EU
SIL rating	SIL2 hardware / SIL3 software

Datasheets

SMART3GD-GRI - Per mines and tunnels
English | pdf

Download
SMART3GC-GRI - For Mines and Tunnels
English | pdf

Download

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