Gas detection: critical for building and industrial safety to prevent risks to people, equipment, and operations.
In many commercial and industrial environments, hazardous gases present a serious yet often invisible threat. Unlike other workplace hazards, dangerous gases cannot always be seen, smelled, or heard, making early detection critical for maintaining a safe facility. Even a minor undetected gas leak can lead to operational disruptions, equipment damage, regulatory concerns, and risks to occupant health and safety. Gas detection systems play a vital role in mitigating these dangers by continuously monitoring indoor air quality and identifying unsafe gas concentrations before they escalate into critical incidents. When gas levels exceed established safety thresholds, these systems can immediately trigger alarms, notify building personnel, and automatically activate HVAC or ventilation systems to help reduce gas accumulation. By providing real-time monitoring and rapid response capabilities, gas detection solutions help create safer, more compliant, and more reliable building environments.
Greystone Energy Systems – Gas Detection
Greystone Energy Systems is dedicated to safeguarding building occupants and property by leading the way in manufacturing toxic and combustible gas detection equipment. Our extensive range of products ensures we can meet the needs of both commercial and industrial applications for toxic and combustible gas detection. The gas detection solution mainly consists of controllers and detectors.
4C-II, M-Controller2 and Q-Controller Controllers
The Q4C-II, M-Controller2, and Q-Controller are part of a scalable Greystone Energy Systems gas detection control platform designed to support applications ranging from small installations to large, fully integrated facilities. The Q4C-II is a multi-channel controller and alarm unit that monitors up to four remote transmitter/sensors, offering RS-485 daisy-chain communication, configurable alarm setpoints, multiple relay outputs, and 24 VDC horn and strobe support, along with Modbus RTU and BACnet/IP connectivity for integration into building automation systems.
Q4C-II
M-Controller2
Q-Controller
For small to mid-sized systems, the M-Controller2 provides expanded capacity, supporting up to 32 digital and 8 analog sensors with flexible relay and alarm configuration for reliable, straightforward operation. For large-scale applications, the Q-Controller delivers advanced system intelligence and scalability, supporting up to 128 channels along with analog and binary I/O, enabling centralized monitoring and high-level automation. Together, these controllers provide flexible and scalable gas detection solutions, all supporting Modbus and BACnet integration for seamless communication across a wide range of industrial and commercial environments.
Toxic, Combustible and Refrigerant Gas Detectors
Greystone Energy Systems offers a range of products that help detect gases such as Carbon Monoxide, Nitrogen Dioxide, Toxic and Combustible Gases and Refrigerants.
Q5/B5 Series: Toxic and Combustible Gas Detectors
Q5 and B5
The Greystone Q5 and B5 Series are versatile smart gas detection platforms designed for monitoring a wide range of toxic and combustible gases using different sensing technologies to cover a broader range of commercial applications. Both series share the same rugged NEMA 4X enclosure, menu-selectable screens and fully assignable analog and Modbus outputs for Q5, whereas B5 series support BACnet output only, making them functional as standalone units and easy to integrate into building automation and gas monitoring systems.
Q5C/B5C: UL2075 approved CO Gas detectors
Greystone Q5C and B5C Series are a simplified version of the Q5 and B5 platforms dedicated specifically to carbon monoxide (CO) detection. Both series are UL2075 approved and share the same rugged NEMA 4X enclosure, menu-selectable screens and fully assignable analog and Modbus output for Q5C, whereas B5C series support BACnet output only, making them functional as standalone units and easy to integrate into building automation and gas monitoring systems. The Q5C and B5C are intended for a variety of applications such as parking garages and vehicle-emission monitoring where only CO sensing is required.
Q6/B6 and Q7 Series: CO & NO2 combination Gas detectors
Q6/B6
The Q6/B6 and Q7 Series gas sensor/transmitters are designed for the detection of carbon monoxide (CO) and nitrogen dioxide (NO₂) using electrochemical sensing technology. The units are housed in a NEMA 4X enclosure and include an integral buzzer for local audible indication. The Q6/B6 main unit and Q7 features an LCD display, LED relay indicators, and supports RS-485 communication with Modbus or BACnet protocols.
Q7
The Q6/B6 combo configuration consists of a main unit and a remote sensor unit that can be installed at different elevations to improve gas detection response times depending on the characteristics of the target gas, whereas CO and NO2 sensors in the Q7 series are housed in a single enclosure.
The above listed series: Q5/B5, Q5C/B5C2, Q6/B6 and Q7 use field-replaceable pre-calibrated sensors boards to help minimize maintenance time and reduce calibration-related downtime. Multiple display screens provide access to operating and sensor information, with password protection available for configuration settings. The units can operate as stand-alone devices or integrate with QEL and third-party control systems.
Q8/B8 Series: Toxic and Combustible Explosion Proof Gas Detectors
Q8/B8
The Q8 and B8 Series Explosion-Proof Gas Detectors are designed for hazardous industrial applications that require a rugged enclosure and compliance with Class 1 Division 2 standards. Both series feature an integrated digital display with menu-accessible information including real-time gas concentration, relay status, STEL, TWA, and peak daily gas values, along with a three-color flashing backlight for clear visual alarm indication and enhanced operator safety. All units support non-intrusive setup and calibration, allowing full programming of operating parameters without opening the enclosure. The Q8 and B8 Series support electrochemical, catalytic bead, PID, and infrared sensing technologies to meet the performance requirements of a wide range of industrial gas detection applications, with remote explosion-proof sensing available for all gas types. The Q8 Series supports Optomux and Modbus RS-485 communication protocols, analog outputs, and three user-programmable relay contacts, while the B8 Series supports BACnet communication and three user-programmable relay contacts, making both series suitable for integration into industrial control, automation, building management, and gas monitoring systems.
QIRF2 and QVRF Series: Refrigerant Gas Detectors
QVRF
The QIRF2 and QVRF Series Refrigerant Gas Detectors are advanced infrared-based monitoring solutions designed to meet key industry standards including ASHRAE 15, B52, the International Mechanical Code, and IEC 60335-2-40 for HVAC and refrigeration safety applications. Both series utilize infrared sensing technology to deliver accurate and reliable refrigerant gas detection without cross-sensitivity or false alarms, while offering long sensor life expectancy exceeding ten years under normal operating conditions. The detectors are designed for a wide range of refrigerant monitoring applications, including Variable Refrigerant Flow (VRF) systems, heat pumps, air conditioners, fan coil units, and refrigeration equipment using A2L and other refrigerants. Features include integrated status indication, configurable relays, horn and strobe support, and simplified non-intrusive calibration for easy setup and maintenance.
QIRF
The QIRF2 Series is housed in a rugged NEMA 4X enclosure and supports RS-485, 4–20 mA, Modbus, and BACnet communication for seamless integration into building automation and gas monitoring systems, while the QVRF Series offers flexible installation options with RS-485 communication and controller integration capabilities. Together, the QIRF2 and QVRF Series provide reliable refrigerant leak detection solutions for commercial, industrial, and HVAC safety applications.
In summary, gas detection is a critical component of building and industrial safety, helping to identify hazardous gases early and prevent risks to people, equipment, and operations.
Greystone Energy Systems provides a complete and scalable gas detection ecosystem that includes advanced controllers and a wide range of gas detectors for toxic, combustible, and refrigerant applications.
From flexible control platforms like the Q4C-II, M-Controller2, and Q-Controller to application-specific detectors such as the Q5/B5, Q6/B6, Q7, Q8/B8, and QIRF2/QVRF series, each solution is designed for reliable performance, easy integration, and compliance with industry standards. Together, these products deliver dependable monitoring across commercial, industrial, and HVAC environments, ensuring safer and more efficient facility operation.
