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In industrial safety, detection of toxic gases such as carbon monoxide (CO), hydrogen sulphide (H₂S), nitrogen dioxide (NO₂), and ammonia (NH₃) is driven by the need to protect personnel from acute and chronic exposure, in line with workplace exposure limits and standards such as EN 62990-1. Typical applications include confined space entry, wastewater treatment, chemical processing plants, confined space entry, combustion environments and refrigeration systems , where toxic gases can accumulate rapidly. These applications require sensors with high sensitivity at low ppm levels, fast response, strong selectivity, and long term stability, ensuring reliable alarm activation and compliance with safety regulations. Within this context, Figaro Engineering Inc. offers a range of electrochemical sensors suited to these requirements:

The Figaro TGS 5042 is well suited to carbon monoxide detection in applications such as boiler rooms and combustion processes. low cross sensitivity, Its long operational life (up to 10 years) and alignment with EN 62990-1 requirements by providing the high linearity and environmental stability necessary for Type SM (Safety Monitoring) industrial applications. Its typical response time of under 60 seconds and linear output deviation of less than ±5% across a 0–500 ppm range ensure it meets the standard's core performance thresholds for reliable alarm triggering. Furthermore, its ability to maintain stable operation across a broad temperature range and its low baseline drift support the rigorous durability and environmental stress testing mandated for industrial gas detection equipment.

The Figaro FECS40-1000 is specifically designed for industrial safety CO monitoring, particularly in confined spaces and process environments where precise low-level detection is required. It provides a detection range of 0–1000 ppm with 1 ppm resolution, combined with a fast response time (<30 seconds T90), enabling rapid detection of hazardous conditions. Its high selectivity to CO and minimal cross sensitivity to gases such as CO₂, H₂S, NO₂, and NH₃ ensures accurate readings in mixed gas environments. Additional features such as low baseline drift (<5% per year) and stable output support long term reliability in demanding industrial applications.


The Figaro FECS44-series includes four sensors, each optimised for different ammonia concentration ranges, making them ideally suited to applications such as wastewater treatment, fertiliser production, and refrigeration systems. In these environments, ammonia presents both toxic and corrosive risks, requiring high sensitivity at low ppm levels, fast response, and strong selectivity. The FECS44-series delivers rapid response, linear output, and stable baseline performance, supporting reliable detection in line with occupational exposure limits. Its leak-proof design and excellent resistance to interference gases, exceeding that of many comparable electrochemical sensors, ensure dependable operation in harsh industrial conditions, where early and accurate detection is essential to protect both personnel and equipment.

The Figaro FECS42-20 is optimised for nitrogen dioxide detection in applications such as power generation, chemical processing, and manufacturing environments. As NO₂ is highly toxic even at very low concentrations, these applications require fast response and high selectivity at ppm and sub-ppm levels. The FECS42-20 is among the fastest responding sensors in its class, enabling rapid detection and timely alarm activation. Combined with its linear output and stable baseline, it delivers accurate and reliable performance. The sensor’s high accuracy for NO₂ and low susceptibility to interference make it perfect for challenging environments.

The Figaro FECS50-100 is specifically developed for hydrogen sulphide detection in demanding environments such as oil and gas facilities, wastewater treatment plants, and biogas systems, where H₂S poses an immediate toxicity risk even at low concentrations. In these applications, multiple toxic gases are often present, making it essential to measure each gas accurately and independently to ensure compliance with exposure limits and to trigger the correct safety response.
A key advantage of the FECS50-100 is its exceptionally low cross sensitivity, outperforming many comparable sensors by significantly reducing the influence of interfering gases on measurement accuracy. This ensures high confidence in H₂S readings, even in complex mixed-gas environments. Combined with its fast response, high sensitivity at low ppm levels, and stable output, the sensor enables rapid and reliable alarm activation. Its robust design also supports consistent performance in humid and contaminated conditions, where H₂S is commonly encountered.