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Universal Five-in-One Sensor - A54

Suitable for residential, commercial, office, consumer, and a wide range of environmental monitoring applications, this sensor integrates PM2.5 detection, CO? monitoring, temperature and humidity sensing, and TVOC detection to enable multi-parameter indoor air quality monitoring and intelligent control. With a plug-and-play design, it is easy to install, simple to operate, and can be quickly integrated into different systems and application scenarios.

  • Highly integrated multi-parameter design reduces system cost and wiring complexity
  • Supports intelligent linkage with HVAC, fresh-air, and purification systems
  • Fast response with long-term stable operation
  • Suitable for multiple applications and quick system integration
Universal Five-in-One Sensor
Sensor Technology Principle
All-in-One Sensor Principle Diagram
All-in-One Sensor Principle Diagram
Technical Specifications
A54-20 5-in-1 Air Quality Sensor
Product Name
A54-20 5-in-1 Air Quality Sensor
Model
A5420
Functions
PM2.5 + CO2 + Temperature + Humidity + TVOC
Communication
RS485
Dimensions
66.4 × 51.4 × 19 mm
Housing Material
PC+ABS, V0 flame-retardant
Operating Voltage
DC12-DC24V
Operating Current
Average: 35 ± 5 mA @ 12.0 VDC; Peak: <150 mA (10 ms), at room temperature
Standby Power Consumption
≤ 1 W
Power Consumption
≤ 3 W
PM2.5 Sensing Principle
Laser scattering technology
PM2.5 Measuring Range
0-999 µg/m³
PM2.5 Resolution
1 µg/m³
PM2.5 Accuracy
≤100 µg/m³: ±15 µg/m³; >100 µg/m³: ±15%
CO2 Sensing Principle
NDIR infrared technology
CO2 Measuring Range
400-9999 ppm
CO2 Resolution
1 ppm
CO2 Accuracy
±(50 ppm + 5% of reading)
TVOC Sensing Principle
Semiconductor conductivity
TVOC Measuring Range
1-30000 ppb
TVOC Resolution
1 ppb
Temperature Sensing
Principle
CMOSens®
Temperature Measuring Range
-20°C to 85°C
Temperature Resolution
0.1°C
Temperature Accuracy
±2°C
Humidity Sensing
Principle
CMOSens®
Humidity Measuring Range
1-99%RH
Humidity Resolution
0.1%RH
Humidity Accuracy
±5%RH
Interface
4-pin socket
Communication Interface
RS485 protocol, 4-pin (+ / A+ / B- / GND)
Physical Connector
GH1.25-4P locking connector
Operating Environment
-10°C to 50°C, 0-95%RH, non-condensing
Storage Environment
-20°C to 65°C, 0-99%RH, non-condensing
Applications
Residential/Central Air Conditioning

Residential/Central Air Conditioning

Designed for residential and central air conditioning systems, it simultaneously monitors temperature, humidity, PM2.5, CO?, and TVOC to comprehensively detect indoor air quality changes and support more precise intelligent linkage of HVAC, fresh-air, and purification systems.

Fresh Air System

Fresh Air System

Suitable for residential and commercial fresh-air systems, it monitors temperature, humidity, PM2.5, CO?, and TVOC in real time to support airflow regulation, air exchange, and indoor air quality management. The module offers fast response and high stability for long-term continuous operation.

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