Five-in-One Air Quality Sensor Module - A54

MAXMAC A54 is a five-in-one air quality sensor module designed for HVAC systems, ventilation systems and building air quality monitoring. It integrates PM2.5, CO₂, TVOC, temperature and humidity detection to provide multi-parameter air quality data for ventilation, air handling units, fresh air control and indoor environmental management systems.

Featuring laser scattering PM2.5 detection, NDIR CO₂ sensing, semiconductor TVOC detection and CMOSens temperature & humidity measurement technology, A54 supports RS485 communication for easy integration with HVAC controllers, BMS building automation systems and environmental monitoring platforms.

Five-in-one air quality monitoring covering PM2.5, CO₂, TVOC, temperature and humidity
CO₂ measuring range: 400–9,999 ppm, resolution 1 ppm
PM2.5 measuring range: 0–999 μg/m³, resolution 1 μg/m³
RS485 communication for HVAC, fresh air and BMS system integration
Flame-retardant PC+ABS housing for long-term integration in HVAC equipment

Five-in-One Air Quality Sensor Module A54 for HVAC and BMS

Sensor Technology Principle

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

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

Applicable Systems

HVAC Systems
Ventilation Systems
Air Handling Units (AHUs)
Ventilation Control Systems
Building Management Systems (BMS)
Indoor Air Quality Monitoring
Commercial Building IAQ Monitoring
Air Purification Systems

Application Areas

Residential and central air conditioning indoor air quality monitoring

Residential / Central Air Conditioning

Designed for residential and central air conditioning systems, A54 continuously monitors temperature, humidity, PM2.5, CO₂ and TVOC to help HVAC, ventilation and purification systems respond more accurately to changes in indoor air quality.

Fresh air system temperature PM2.5 CO2 and TVOC monitoring

Ventilation Systems

Suitable for residential and commercial ventilation systems, the sensor tracks temperature, humidity, PM2.5, CO₂ and TVOC in real time, providing reliable data for airflow regulation, air exchange and indoor air quality management in long-running systems.