Fixed gas detectorsare safety systems that continuously monitor flammable and toxic gases, oxygen levels or specialised process gases in industrial areas. New Cosmos, CETCI, Det-Tronics and Sensidyne solutions address diverse requirements across petrochemicals, industrial estate infrastructure, power generation plants, chemicals, refrigeration, semiconductor manufacturing and process automation.
Product selection must be made based on target gas, measurement range, sampling type, sensor positioning, 4–20 mA / Modbus communication and ATEX/IECEx application classification.
New Cosmos KD-12 – ATEX Fixed Flammable and Toxic Gas Detector with Display
Operation and technical details
Current product description
Fixed Gas Detector for All Gases, with Display and Stainless Steel Enclosure. The New Cosmos KD-12 Series is a robust solution engineered for professional field operations, delivering reliable measurement, rapid risk assessment and more effective safety management.
Application areas
Fixed-point hazardous gas monitoring in petrochemical plants, industrial estate gas networks, boiler rooms and manufacturing facilities.
Key advantages and selection
Local concentration/alarm display, ease of maintenance at the measurement point and automation integration options.
Important technical note: NOVEL product migration note: For new projects involving the legacy KD-2A/3A and KD-5A/5B series, the KD-12 family is evaluated. Procurement/production status of legacy instruments as well as compatibility with existing mounting, electrical interfaces, target gas and certifications must be confirmed with NOVEL.
Legacy series product information: KD-2A/3A legacy product page · KD-5A/5B legacy product page
Diffusion-type fixed gas monitoring platform with display, designed for industrial field installations; target gas and sensor options are specified on a project basis.
New Cosmos PD-12 – Fixed Gas Detector with Built-in Suction Pump
Operation and technical details
Current product description
Fixed Gas Detector for All Gases, with Display and Stainless Steel Enclosure, Built-in Suction Pump (Extractive Type). Delivers a high-performance solution for professional field teams, accelerating the measurement process whilst enhancing operational safety and operational efficiency.
Application areas
Used at furnaces, processes, containment enclosures or remote gas sampling points requiring a sampling line.
Key advantages and selection
Can be adapted to process and plant automation depending on the built-in suction pump and sensor/measurement configuration.
Important technical note: NOVEL product migration note: The PD-12 series is evaluated for new projects in place of the legacy PE-2DC series. Alignment of new ATEX/CE documentation with the ordered gas, sensor and variant, as well as the compatibility of pump flow rate, sampling lines and electrical interfaces, must be verified on a project-specific basis.
Fixed pumped gas detection solution with display, taking measurements by drawing gas through a sampling line.
New Cosmos PS-7 – Speciality/Toxic Gas Detector for Semiconductor Manufacturing
Operation and technical details
Current product description
Ultra-High Sensitivity Fixed Gas Detector for Toxic and Speciality Gases. The New Cosmos PS-7 is a powerful solution engineered for professional field operations, delivering reliable measurement, rapid risk assessment and more effective safety management.
Application areas
Semiconductor fabrication facilities, speciality gas cabinets and high-precision manufacturing processes.
Key advantages and selection
The pre-calibrated replaceable sensor unit approach helps streamline sensor maintenance and field servicing procedures.
Fixed detection system with sensor unit for speciality and toxic gases used in semiconductor fabrication.
New Cosmos KS-7O – Oxygen Deficiency and Enrichment Alarm Detector
Operation and technical details
Application areas
Laboratories, gas storage areas, process areas and industrial plant zones with oxygen deficiency risks.
Key advantages and selection
Integrated detection and alarm, straightforward on-site status monitoring; power supply option must be confirmed according to the model variant.
Important technical note: Hazardous area (ATEX) compliance must not be assumed for the KS-7 family; certification and installation classification must be verified separately for each application.
Fixed O₂ alarm instrument monitoring ambient oxygen levels, combining indicator and audible/visual alarm functions in a single unit.
New Cosmos KS-7D – Carbon Monoxide (CO) Fixed Detection and Alarm Instrument
Operation and technical details
Application areas
Single-point monitoring in boiler houses, manufacturing workshops and building utility areas where CO risks exist.
Key advantages and selection
Electrochemical CO detection, local audible/visual alarm and selectable power supply configurations.
Important technical note: The official model code is KS-7D; the KD-7D designation seen in some search results is not a technical product code.
Integrated fixed gas alarm monitoring carbon monoxide (CO) concentration, complete with display and audible/visual alerts.
New Cosmos KS-7R – Carbon Dioxide (CO₂) Fixed Monitoring and Alarm Detector
Operation and technical details
Current product description
Fixed Gas Detector for Carbon Dioxide, with Display. The New Cosmos KS-7R Carbon Dioxide Detector is a powerful solution engineered for professional field operations, delivering reliable measurement, rapid risk assessment and more effective safety management.
Application areas
CO₂ cylinder and storage areas, fermentation/production rooms, laboratories and indoor process safety.
Key advantages and selection
Compact architecture combining detection head and alarm; rapid local alerting at a single point.
Single-point monitoring solution displaying CO₂ levels on a large LCD, equipped with visual and audible alarms.
CETCI cGAS – Refrigerant and Chemical Gas Detector with Modbus Output
Operation and technical details
Current product description
Fixed Gas Detector with Digital Modbus Connectivity and Plug & Play Sensor Option. CETCI cGAS is a powerful solution engineered for professional field operations, delivering reliable measurement, rapid risk assessment and more effective safety management.
Application areas
Refrigeration plants, mechanical plant rooms, laboratories and commercial/industrial HVAC applications.
Key advantages and selection
Digital communication, control panel or BMS integration depending on the target gas cartridge and model variant.
Fixed detector for refrigerants and selected chemical gas applications, featuring Modbus communication and a replaceable sensor architecture.
CETCI LPT – Economical Fixed Gas Monitoring Transmitter and Sensor Platform
Operation and technical details
Current product description
Fixed Gas Detector with Wide Sensor and Infrastructure Options, with or without Display. The CETCI LPT Series is a powerful solution engineered for professional field operations, delivering reliable measurement, rapid risk assessment and more effective safety management.
Application areas
Car parks, mechanical spaces and building automation points requiring continuous gas measurement.
Key advantages and selection
Project-tailored balance of cost and integration via display/blind and communication variants.
Fixed gas detection transmitter with sensor options selectable according to the target gas and building infrastructure.
Det-Tronics FlexSonic – Ultrasonic Pressurised Gas Leak Detector
Operation and technical details
Application areas
High-pressure leak alarming in open outdoor natural gas/chemical plants, compressor stations and windy process areas.
Key advantages and selection
Analyses 24 ultrasonic bands to discriminate against nuisance noise; supports 4–20 mA/HART and SIL 2 capable applications in suitable configurations.
Important technical note: FlexSonic does not measure gas concentration (ppm or %LEL); it detects the acoustic signature of high-pressure leaks. It serves as a complement to point gas detection.
Acoustic safety detector that listens for the ultrasonic sound profile generated by pressurised gas leaks, raising alerts without requiring contact with the gas.
Sensidyne SensAlarm FLEX – Integrated Fixed Gas Detector and Alarm System
Operation and technical details
Application areas
Chemicals, industrial manufacturing, wastewater, laboratories and hazardous area gas safety projects.
Key advantages and selection
Local/remote sensor, Modbus, 4–20 mA, alarm relays, Plus Series smart sensors and hazardous area application certification in selected configurations.
Important technical note: Hazardous area ratings differ between the sensor interface and main display enclosure; model and installation zone must be verified against current certification.
Configurable fixed gas monitoring system offering sensor, display, audible/visual alarm and control outputs within an integrated platform.
Sensidyne SensFlex – Dual Sensor Head and PID/VOC Fixed Gas Detector
Operation and technical details
Application areas
Chemical processes, solvent handling and industrial locations where multiple gases are monitored simultaneously.
Key advantages and selection
Modbus TCP, web interface and model-dependent PID/dual-sensor options facilitate monitoring and ease of maintenance.
Flexible platform for monitoring process gases and volatile organic compounds with dual sensing heads or fixed PID/VOC variants.
Sensidyne SensAir – ATEX/IECEx Industrial Fixed Flammable, Toxic and O₂ Gas Detector
Operation and technical details
Current product description
Fixed Flammable - Toxic - Oxygen Gas Detector (toxic gas-resistant, cast aluminium enclosure, with display model options). Delivers a high-performance solution for professional field teams, accelerating the measurement process whilst enhancing operational safety and operational efficiency.
Application areas
Process safety in petrochemical, steel, refinery, chemical and heavy manufacturing facilities.
Key advantages and selection
Electrochemical/catalytic sensor options, 4–20 mA signal, multiple enclosure and display configurations; ATEX/IECEx scope is variant-dependent.
Rugged industrial fixed detector with selectable sensor types for monitoring flammable gases, toxic gases or oxygen.
Sensidyne SensAlert ASI – SIL 2 Toxic, Flammable and Oxygen Fixed Gas Detector
Operation and technical details
Current product description
Fixed Toxic and Flammable Gas Detector for Harsh Field Conditions, with Display and Configurable Architecture, Infrared-Electrochemical-Catalytic Gas Sensor Options, Cast Aluminium. Delivers a high-performance solution for professional field teams, accelerating the measurement process whilst enhancing operational safety and operational efficiency.
Application areas
SIL-targeted gas protection architectures, chemical, oil, refinery and critical process monitoring.
Key advantages and selection
SIL 2 certified functions, sensor life indication and Test-on-Demand capability on selected toxic gas sensors.
Fixed gas detection system for critical safety applications, featuring smart sensor and functional safety capabilities.
How to Select a Fixed Gas Detection System?
A gas detection project in an industrial plant is not merely purchasing sensors: physical gas properties, layout, leak sources, automation/ESD strategy, certification scope and maintenance regimes must be evaluated together.
Gas and sensor selection
Correct sensing principles differ for flammable gas (LEL), toxic gas (ppm), oxygen (% vol), CO₂ and semiconductor speciality gases. Sampling location and process environment must be assessed in tandem.
Diffusion or pumped sampling?
Fixed-point diffusion measurement like the KD-12 is not the same as pumped measurement via a sample line like the PD-12. Criteria such as tubing delay, condensation and sample line loss form an integral part of safety design.
Control and maintenance architecture
4–20 mA, Modbus, HART, relays and sensor communications for PLC/DCS and fire-and-gas panels are selected per product. Calibration access, proof testing, logging and spare parts plans must be established.
Certification and area classification
ATEX/IECEx, performance and SIL/IEC 61508 documentation must be verified for the relevant product revision. Instruments must not be selected for explosive atmospheres without valid certification.
Frequently Asked Questions About Fixed Gas Detectors
What is the difference between a fixed gas detector and a portable gas detector?
A fixed detector continuously measures in situ to feed control systems and plant alarms. A portable detector meets personal monitoring requirements. Depending on the site risk assessment, both technologies can be deployed together.
What is the difference between the KD-12 and PD-12?
The KD-12 is evaluated for diffusion-based fixed-point monitoring, whereas the PD-12 is intended for applications requiring gas extraction via an internal pump. Target gas, pump/sampling line, signal outputs and certification scope are determined by configuration.
What is recommended to replace the legacy KD-2A/3A, KD-5A/5B and PE-2DC models?
In new fixed-installation projects, NOVEL evaluates the KD-12 as an alternative to legacy KD families, and the PD-12 series as an alternative to pumped sampling applications previously using the PE-2DC. Drop-in compatibility with legacy mounting or process connections cannot be guaranteed; a technical migration assessment is required.
Which gases do the KS-7O, KS-7D and KS-7R measure?
The KS-7O is designed to monitor oxygen (O₂), the KS-7D carbon monoxide (CO), and the KS-7R carbon dioxide (CO₂). Sensor technologies and alarm targets differ; they must not be assumed to monitor other gases within the same instrument.
Do all fixed gas detectors feature ATEX/IECEx and SIL 2?
No. ATEX/IECEx indicates suitability for hazardous area installation, whereas SIL denotes functional safety performance. Each certification must be verified specifically for the model, sensor and application configuration. Models such as the KS-7 must not be assumed suitable for hazardous areas.
Can the FlexSonic measure ppm or %LEL gas concentration?
No. FlexSonic detects the ultrasonic sound produced by pressurised gas leaks and provides an acoustic leak alarm. Where gas concentration is required, it should be paired with point gas detectors.
How do SensAlarm FLEX, SensFlex, SensAir and SensAlert ASI differ?
SensAlarm FLEX is an integrated local audible/visual alarm and control solution; SensFlex is geared towards dual-sensor/PID-VOC monitoring; SensAir is a single-point sensor focused on durability and cost-efficiency; SensAlert ASI is evaluated for applications requiring high-integrity features such as SIL 2.
Where should gas detectors be installed and via which outputs should they be monitored?
Detector height and placement are determined by gas density, airflow patterns, potential leak sources and indoor/outdoor conditions. 4–20 mA, Modbus, HART or relay outputs for the control system are selected according to the model and project safety philosophy.
Sensor Technology and Long-Term Reliability
In gas safety, the distinction lies in the technology behind the instrument. New Cosmos Electric is an original technology manufacturer with dedicated gas detection R&D and manufacturing infrastructure. Stated in the company's publicly available 2025 financial report, its 67% subsidiary stake in Figaro Engineering, one of the world's largest gas sensor manufacturers, unites gas detector design and sensor technology through the R&D capabilities of a single group.
In industrial gas detection, robust hardware derives its true value from sustained, long-term performance. Sensidyne underpins this approach with intelligent, replaceable sensor architectures, proven sensor performance and dedicated servicing infrastructure. Sensor lifetime and performance depend on sensor chemistry, target gas and operating environment. Choosing the appropriate technology for the application is therefore just as critical as selecting the right brand. New Cosmos, Sensidyne and Det-Tronicsprovide compelling options for industrial projects with stringent quality requirements.
NOVEL delivers this technological capability to the field across Türkiye. It provides comprehensive technical support ranging from instrument selection and process/application appraisal to commissioning, maintenance and calibration scheduling. Grounded in current manufacturer documentation and your project specifications, NOVEL guides your investment to the appropriate solution. Do not leave gas safety to chance. Determine the right solution for your application with NOVEL.
