A54-24 CO2 Sensor

MAXMAC A54-24 is a compact CO2 sensor designed for HVAC systems, fresh air systems and indoor air quality monitoring. It provides reliable CO2 concentration data for demand-controlled ventilation, air handling units and BMS integration.

Using NDIR infrared CO2 sensing and RS485 communication, A54-24 supports stable data output for ventilation control, occupancy-related fresh-air adjustment and commercial building air quality management.

Dedicated NDIR CO2 concentration monitoring
CO2 measuring range: 400-9999 ppm, resolution 1 ppm
Accuracy: ±(50 ppm + 5% of reading)
RS485 communication for HVAC, AHU and BMS system integration
Compact flame-retardant PC+ABS housing for long-term equipment integration

Sensor Technology Principle

All-in-One Sensor Principle Diagram

Technical Specifications

A54-24 CO2 Sensor

Product Name

A54-24 CO2 Sensor

Model

A5424

Functions

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

CO2 Sensing Principle

NDIR infrared technology

CO2 Measuring Range

400-9999 ppm

CO2 Resolution

1 ppm

CO2 Accuracy

±(50 ppm + 5% of reading)

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 CO2 Monitoring
Commercial Indoor Air Quality Monitoring
Demand-Controlled Ventilation
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.