Electrical cabinets, control cabinets, UPS cabinets, distribution boxes and equipment enclosures are widely used in industrial, commercial and infrastructure projects. These cabinets often contain power components, terminals, relays, controllers, communication modules and cables. When the internal environment changes abnormally, the problem may not be visible from outside the cabinet.
In many projects, the first sign of a potential fire risk is not a large open flame. It may start with overheating, cable insulation damage, smouldering components or light smoke inside the cabinet. If this early warning signal is not detected in time, the fault may develop into a serious fire event, equipment shutdown or project loss.
For this reason, cabinet-level smoke detection and environmental monitoring are becoming more important in modern fire safety and industrial monitoring systems. A compact detector that can monitor smoke, temperature and humidity at the same time can help users identify abnormal conditions earlier and connect the cabinet alarm information to a monitoring system.
A single alarm signal is often not enough for cabinet monitoring. In real electrical and industrial environments, different parameters can provide different warning information.
Smoke detection helps identify visible smoke generated by smouldering materials, cable insulation damage or early fire development. Temperature monitoring helps users understand whether the cabinet environment is becoming hotter than expected. Humidity monitoring helps users observe the environmental condition inside or around the cabinet, especially in applications where moisture, condensation or unstable ambient conditions may affect electrical equipment.
By combining smoke, temperature and humidity monitoring in one device, users can obtain more practical information from a compact cabinet-level detector. This is especially useful for small protected spaces where installation space is limited and where multiple separate sensors may increase wiring complexity.
ANWETECH AT-S232 / AT-S233 is a photoelectric smoke, temperature and humidity detector designed for cabinet and small-space monitoring applications. It combines three monitoring functions in one compact device: smoke detection, temperature measurement and humidity measurement.
The smoke detection section uses a labyrinth chamber and photoelectric signal processing technology. This design helps the detector monitor visible smoke while resisting common interference factors such as dust, insects and external light. The detector is suitable for visible smoke generated by slow smouldering fires or open flames.
This makes AT-S232 / AT-S233 suitable for applications such as electrical cabinets, control cabinets, box-type substations, energy storage environments, UPS cabinets, telecom cabinets and similar protected spaces where early smoke warning and environmental monitoring are required.
Cabinet applications usually have limited installation space. A detector used in these areas should be compact, easy to mount and suitable for close-range smoke monitoring.
AT-S232 / AT-S233 has a compact structure with a diameter of 52 mm and a height of 24 mm. The detector supports ceiling-mounted installation and is suitable for cabinets, enclosures and small protected spaces. The base is fixed by magnetic points, helping simplify installation in suitable cabinet applications.
During normal monitoring status, the red LED flashes once every 8 seconds. During smoke alarm, fault or alarm status, the red LED stays on. The built-in buzzer provides audible alarm indication during smoke alarm or test status. This allows local visual and audible indication even before the alarm data is transmitted to a host system.
One of the key advantages of AT-S232 / AT-S233 is RS485 communication. Many engineering projects require cabinet detectors to send data to a host system, monitoring panel, PLC, BMS or other industrial monitoring platform. RS485 communication helps make this integration practical.
AT-S232 / AT-S233 uses Modbus-RTU communication protocol. The default communication parameters include 9600 bps baud rate, 8 data bits, no parity and 1 stop bit. The default station address is 0x01, and the broadcast station address is 0xFE.
Through RS485 communication, temperature and humidity data can be transmitted to the user host system for further integration or secondary development. This is important for projects that require centralized monitoring, remote status display or data integration into existing automation and building management systems.
ANWETECH provides two model options for different project requirements.
AT-S232 supports smoke, temperature and humidity monitoring with RS485 communication and relay normally open / normally closed output. This model is suitable for projects that need both data communication and local relay signal output. The relay output can be useful when the detector needs to connect with a local alarm input, monitoring module or simple linkage circuit.
AT-S233 supports smoke, temperature and humidity monitoring with RS485 output. This model is suitable for projects where the user mainly needs communication-based data transmission through RS485 Modbus-RTU, without relay NO / NC output.
In simple terms, AT-S232 is suitable when the project needs RS485 plus relay output. AT-S233 is suitable when the project only needs RS485 communication output.
AT-S232 / AT-S233 can be used in many small-space monitoring applications where smoke, temperature and humidity information are important.
In electrical cabinets, the detector can help monitor early smoke conditions caused by abnormal heating, insulation damage or component failure. In control cabinets, it can provide local alarm indication and communication output for automation monitoring systems. In UPS cabinets and telecom cabinets, the detector can help support continuous monitoring of smoke and environmental conditions.
For box-type substations and distribution boxes, compact smoke and environmental monitoring is useful because these spaces often contain electrical equipment in a limited enclosure. For energy storage environments and battery-related cabinets, the detector can help monitor visible smoke, temperature and humidity conditions inside or near the protected space.
The product should always be selected, installed and integrated according to the final project design, local codes and confirmed product documentation.
Correct installation is important for reliable detector performance. For cabinet and small protected space applications, the detector should preferably be installed horizontally. If inclined installation is necessary, the tilt angle should not be greater than 45 degrees.
There should be no obstruction within 0.5 m around the detector. The horizontal distance from the detector to the air-conditioning supply outlet should not be less than 1.5 m. These installation points help reduce airflow influence and obstruction around the smoke inlet.
The detector includes a test button. Short-pressing the test button can test the audible and visual alarm function. During the test, the red LED flashes quickly and the buzzer gives an alarm sound. It is recommended to perform a simulated fire alarm test every six months to verify that the detector works properly.
In cabinet applications, space, wiring and integration are always important considerations. Using separate smoke, temperature and humidity sensors may require more installation space and more wiring. It may also increase the complexity of system integration.
A 3-in-1 detector provides a more compact and practical solution. It allows smoke, temperature and humidity monitoring through one device. For projects using RS485 communication, the detector can also support data transmission to the host system through Modbus-RTU.
This type of solution is especially suitable for system integrators, electrical contractors, cabinet manufacturers, BMS contractors, industrial automation companies and fire safety solution providers who need cabinet-level monitoring with engineering-friendly communication output.
