Description
Crowcon Smart 3G-C2-LD is a multi-gas fixed detector for Zone 1 hazardous areas, combining explosion-proof design with SIL-certified safety.
The Crowcon Smart 3G-C2-LD is a fixed gas detector for industrial sites where flammable, toxic, VOC, refrigerant gases and CO2 may be present in hazardous areas. It combines explosion-proof protection with wide gas coverage, multiple sensor technologies and high-integrity functional safety. Flexible outputs, including analogue, relay and digital communications, support straightforward integration into control and safety systems. Fast response, continuous self-diagnostics and efficient one-person calibration help operators maintain compliant, long-term gas monitoring with reduced maintenance burden and downtime.
AT A GLANCE
- Wide gas and sensor platform: Detects flammable, toxic, VOC, CO2, SF6 and refrigerant gases using catalytic, IR, electrochemical and PID sensors.
- Hazardous area protection: Explosion-proof enclosure with options for gas and dust zones, supported by global hazardous area approvals.
- Easy system integration: Standard 4–20 mA, three relays and optional Modbus over RS485 simplify connection to plant-wide control and safety systems.
- Low-overhead operation: Fast response, continuous self-diagnostics and one-person keypad calibration support reliable performance with reduced service time.
For detailed technical data, consult the Specifications tab.
Overview of Crowcon Smart 3G-C2-LD
Engineered for Hazardous Area Gas Detection
The Crowcon Smart 3G-C2-LD is designed for fixed gas detection in classified hazardous areas where flammable gases, vapours or combustible dusts create an explosion risk. Its explosion-proof enclosure supports installation in gas zones, while an optional dust adapter extends protection to dust-classified areas. This enables continuous monitoring of flammable, toxic, VOC, refrigerant gases and CO2 in locations where process safety, environmental protection and regulatory compliance are critical.
A robust aluminium pressure die-cast housing with an epoxy, chemically resistant finish and a stainless steel sensor head withstands harsh industrial conditions. Ingress protection to IP65 resists dust and water, helping the detector maintain stable operation in exposed, contaminated or washdown-prone areas.
Wide Gas Coverage and Platform Flexibility
The Smart 3G-C2-LD supports multiple sensor technologies on a single platform. Catalytic sensors address flammable gas risks, infrared sensors suit flammable, refrigerant and CO2 monitoring, electrochemical cells cover a range of toxic gases and oxygen, and PID sensors target VOCs. This breadth of options allows standardisation on one detector family across varied applications, simplifying engineering, training and spare parts management.
Infrared sensing options offer poison-free operation, high accuracy and extended predicted lifetimes, reducing sensor replacement frequency and associated site visits. The detector measures flammable compounds in % LFL, toxic and refrigerant gases in ppm, and oxygen and CO2 in % by volume, supporting appropriate alarm set points for process and safety requirements.
High-Integrity Safety and Approvals
The Smart 3G-C2-LD is supported by ATEX and IECEx approvals for use in explosive atmospheres, with variants suitable for both gas and dust classified locations. A version with intrinsically safe detector heads enables additional flexibility where wiring or local regulations require intrinsic safety at the sensing point.
Functional safety certification up to SIL2 for hardware and SIL3 for software, with certain hardware references capable of SIL3, underpins use within safety instrumented systems. Redundant architecture and continuous self-diagnostics help ensure predictable, fail-safe behaviour, supporting risk reduction targets in safety analyses.
Simple Integration with Control and Safety Systems
The detector integrates easily into new or existing safety architectures. A standard 4–20 mA 3-wire analogue output connects to DCS, PLC and gas control panels, while three relay outputs can directly drive local alarms, ventilation or shutdown circuits. This allows both centralised monitoring and decentralised, hardwired safety responses without additional interface hardware.
An optional RS485 interface with Modbus protocol supports digital communication, enabling multiple detectors to be networked for central supervision, configuration and data collection. Modular relay boards provide further flexibility for tailoring alarm and control logic to changing plant layouts or evolving risk assessments.
Three cable entries in the compact enclosure facilitate daisy-chaining and looping between devices, helping to streamline cabling on multi-point installations and reducing installation time and material costs.
Performance, Diagnostics and Visual Status Indication
Fast response times support early detection of leaks and hazardous gas build-up, allowing timely activation of protective measures. Continuous self-diagnosis monitors sensor condition and internal electronics to flag potential faults before they compromise safety performance.
A multi-colour, high-brightness LED crown provides immediate visual feedback on detector status and alarms, aiding operators and maintenance personnel during normal operation, commissioning and fault finding, especially in noisy or low-visibility environments.
Efficient Operation, Calibration and Maintenance
The Smart 3G-C2-LD is designed to minimise lifecycle costs. A zero tracking function automatically maintains a stable zero point, compensating for gradual drift and environmental changes. This reduces the frequency of manual adjustments and supports consistent measurement accuracy across long service intervals.
One-person calibration using dedicated STS/CKD+ and STS/CKD-OLED keypads allows adjustment of zero, span and 4–20 mA values either in situ or in the workshop, reducing labour and time required for scheduled maintenance. Graphical visualisation of instantaneous gas concentrations during calibration on the OLED keypad simplifies fine-tuning and verification.
Sensor replacement is straightforward, limiting downtime when gas types or ranges change or when sensors reach end of life. A gas test kit supports routine bump testing to verify detector response in line with site procedures and standards.
Advanced Configuration, Logging and Asset Management
PC-based calibration and configuration software, used with a USB/RS485 converter, enables centralised adjustment of alarm thresholds, configuration parameters and detector settings. Integrated data logging captures historical readings and events, which can be exported via the keypad or software to support incident investigation, regulatory reporting and trend analysis.
This depth of configuration and diagnostic information supports proactive maintenance strategies, helping site teams identify emerging issues early and plan interventions without disrupting production.
Flexible Installation and Long-Term Deployment
Remote sensor head kits allow the sensing element to be mounted at the optimal sampling point while the main transmitter remains accessible, simplifying monitoring of confined spaces, ducts, pits and other hard-to-reach areas. ATEX-approved cable glands, sensor-head adapters and a choice of accessories support compliant, mechanically robust installations.
An optional stainless steel Ex d enclosure version is available for particularly corrosive or aggressive environments, further extending service life where chemical attack or extreme conditions are expected. Low power consumption supports energy-efficient continuous operation.
A wide range of factory-configured variants is offered for specific gases and ranges, reducing on-site configuration effort. Combined with comprehensive documentation and digital tools such as 3D viewers and augmented reality visualisation, the Crowcon Smart 3G-C2-LD provides a scalable platform for fixed gas detection across diverse industrial sectors.
Documentation
Crowcon Smart 3G-C2-LD is a multi-gas fixed detector for Zone 1 hazardous areas, combining explosion-proof design with SIL-certified safety.
The Crowcon Smart 3G-C2-LD is a fixed gas detector for industrial sites where flammable, toxic, VOC, refrigerant gases and CO2 may be present in hazardous areas. It combines explosion-proof protection with wide gas coverage, multiple sensor technologies and high-integrity functional safety. Flexible outputs, including analogue, relay and digital communications, support straightforward integration into control and safety systems. Fast response, continuous self-diagnostics and efficient one-person calibration help operators maintain compliant, long-term gas monitoring with reduced maintenance burden and downtime.
AT A GLANCE
- Wide gas and sensor platform: Detects flammable, toxic, VOC, CO2, SF6 and refrigerant gases using catalytic, IR, electrochemical and PID sensors.
- Hazardous area protection: Explosion-proof enclosure with options for gas and dust zones, supported by global hazardous area approvals.
- Easy system integration: Standard 4–20 mA, three relays and optional Modbus over RS485 simplify connection to plant-wide control and safety systems.
- Low-overhead operation: Fast response, continuous self-diagnostics and one-person keypad calibration support reliable performance with reduced service time.
For detailed technical data, consult the Specifications tab.
Overview of Crowcon Smart 3G-C2-LD
Engineered for Hazardous Area Gas Detection
The Crowcon Smart 3G-C2-LD is designed for fixed gas detection in classified hazardous areas where flammable gases, vapours or combustible dusts create an explosion risk. Its explosion-proof enclosure supports installation in gas zones, while an optional dust adapter extends protection to dust-classified areas. This enables continuous monitoring of flammable, toxic, VOC, refrigerant gases and CO2 in locations where process safety, environmental protection and regulatory compliance are critical.
A robust aluminium pressure die-cast housing with an epoxy, chemically resistant finish and a stainless steel sensor head withstands harsh industrial conditions. Ingress protection to IP65 resists dust and water, helping the detector maintain stable operation in exposed, contaminated or washdown-prone areas.
Wide Gas Coverage and Platform Flexibility
The Smart 3G-C2-LD supports multiple sensor technologies on a single platform. Catalytic sensors address flammable gas risks, infrared sensors suit flammable, refrigerant and CO2 monitoring, electrochemical cells cover a range of toxic gases and oxygen, and PID sensors target VOCs. This breadth of options allows standardisation on one detector family across varied applications, simplifying engineering, training and spare parts management.
Infrared sensing options offer poison-free operation, high accuracy and extended predicted lifetimes, reducing sensor replacement frequency and associated site visits. The detector measures flammable compounds in % LFL, toxic and refrigerant gases in ppm, and oxygen and CO2 in % by volume, supporting appropriate alarm set points for process and safety requirements.
High-Integrity Safety and Approvals
The Smart 3G-C2-LD is supported by ATEX and IECEx approvals for use in explosive atmospheres, with variants suitable for both gas and dust classified locations. A version with intrinsically safe detector heads enables additional flexibility where wiring or local regulations require intrinsic safety at the sensing point.
Functional safety certification up to SIL2 for hardware and SIL3 for software, with certain hardware references capable of SIL3, underpins use within safety instrumented systems. Redundant architecture and continuous self-diagnostics help ensure predictable, fail-safe behaviour, supporting risk reduction targets in safety analyses.
Simple Integration with Control and Safety Systems
The detector integrates easily into new or existing safety architectures. A standard 4–20 mA 3-wire analogue output connects to DCS, PLC and gas control panels, while three relay outputs can directly drive local alarms, ventilation or shutdown circuits. This allows both centralised monitoring and decentralised, hardwired safety responses without additional interface hardware.
An optional RS485 interface with Modbus protocol supports digital communication, enabling multiple detectors to be networked for central supervision, configuration and data collection. Modular relay boards provide further flexibility for tailoring alarm and control logic to changing plant layouts or evolving risk assessments.
Three cable entries in the compact enclosure facilitate daisy-chaining and looping between devices, helping to streamline cabling on multi-point installations and reducing installation time and material costs.
Performance, Diagnostics and Visual Status Indication
Fast response times support early detection of leaks and hazardous gas build-up, allowing timely activation of protective measures. Continuous self-diagnosis monitors sensor condition and internal electronics to flag potential faults before they compromise safety performance.
A multi-colour, high-brightness LED crown provides immediate visual feedback on detector status and alarms, aiding operators and maintenance personnel during normal operation, commissioning and fault finding, especially in noisy or low-visibility environments.
Efficient Operation, Calibration and Maintenance
The Smart 3G-C2-LD is designed to minimise lifecycle costs. A zero tracking function automatically maintains a stable zero point, compensating for gradual drift and environmental changes. This reduces the frequency of manual adjustments and supports consistent measurement accuracy across long service intervals.
One-person calibration using dedicated STS/CKD+ and STS/CKD-OLED keypads allows adjustment of zero, span and 4–20 mA values either in situ or in the workshop, reducing labour and time required for scheduled maintenance. Graphical visualisation of instantaneous gas concentrations during calibration on the OLED keypad simplifies fine-tuning and verification.
Sensor replacement is straightforward, limiting downtime when gas types or ranges change or when sensors reach end of life. A gas test kit supports routine bump testing to verify detector response in line with site procedures and standards.
Advanced Configuration, Logging and Asset Management
PC-based calibration and configuration software, used with a USB/RS485 converter, enables centralised adjustment of alarm thresholds, configuration parameters and detector settings. Integrated data logging captures historical readings and events, which can be exported via the keypad or software to support incident investigation, regulatory reporting and trend analysis.
This depth of configuration and diagnostic information supports proactive maintenance strategies, helping site teams identify emerging issues early and plan interventions without disrupting production.
Flexible Installation and Long-Term Deployment
Remote sensor head kits allow the sensing element to be mounted at the optimal sampling point while the main transmitter remains accessible, simplifying monitoring of confined spaces, ducts, pits and other hard-to-reach areas. ATEX-approved cable glands, sensor-head adapters and a choice of accessories support compliant, mechanically robust installations.
An optional stainless steel Ex d enclosure version is available for particularly corrosive or aggressive environments, further extending service life where chemical attack or extreme conditions are expected. Low power consumption supports energy-efficient continuous operation.
A wide range of factory-configured variants is offered for specific gases and ranges, reducing on-site configuration effort. Combined with comprehensive documentation and digital tools such as 3D viewers and augmented reality visualisation, the Crowcon Smart 3G-C2-LD provides a scalable platform for fixed gas detection across diverse industrial sectors.
