A54-22 3-in-1 Air Quality Sensor

MAXMAC A54-22 is a compact 3-in-1 air quality sensor designed for HVAC systems, ventilation systems and indoor air quality monitoring. It integrates PM2.5, temperature and humidity detection to provide reliable multi-parameter data for air handling units and fresh air control.

With laser scattering PM2.5 detection, CMOSens temperature and humidity measurement and RS485 communication, A54-22 supports long-term integration in HVAC controllers, BMS platforms and indoor environmental monitoring systems.

Integrated PM2.5, temperature and humidity monitoring
PM2.5 measuring range: 0-999 µg/m³, resolution 1 µg/m³
Temperature measuring range: -20°C to 85°C, resolution 0.1°C
Humidity measuring range: 1-99%RH, resolution 0.1%RH
RS485 communication for HVAC, fresh air and BMS system integration

Sensor Technology Principle

All-in-One Sensor Principle Diagram

Technical Specifications

A54-22 3-in-1 Air Quality Sensor

Product Name

A54-22 3-in-1 Air Quality Sensor

Model

A5422

Functions

PM2.5 + Temperature + Humidity

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%

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

The matching GH1.25-4P locking terminal cable should be prepared by the user for connection.

Applicable Systems

HVAC Systems
Fresh Air Systems
Air Handling Units (AHUs)
Ventilation Control Systems
Smart Building Air Quality Monitoring
Commercial Indoor Environmental Monitoring
Air Purification Systems
Public Building Air Quality Management

Application Areas

Residential and central air conditioning indoor air quality monitoring

Residential / Central Air Conditioning

Designed for residential and central air conditioning systems, this A54 configuration provides indoor air quality data to help HVAC, ventilation and purification systems respond more accurately to changing room conditions.

Fresh air and ventilation system monitoring

Ventilation Systems

Suitable for residential and commercial ventilation systems, the sensor provides stable data for airflow regulation, air exchange and indoor air quality management in long-running systems.