APCA-370

Ambient Carbon Dioxide Monitor

The APCA-370 is a high-precision analyzer for ambient carbon dioxide monitoring, featuring HORIBA’s cross-flow modulation NDIR (non-dispersive infrared) technology. Its integrated self-regenerating CO₂ purifier ensures long-term, stable, and low-maintenance operation—ideal for continuous environmental monitoring, climate research, or CO₂ leak detection.

Why Choose APCA-370

Continuous, High-Stability Measurement – Ideal for long-term CO₂ monitoring without frequent calibration.
Cross-Flow Modulation Technology – Alternates sample and reference gas for interference-resistant precision.
Built-In Regenerative CO₂ Purifier – Eliminates need for external calibration gas, simplifying maintenance.
Robust Connectivity – Equipped with touchscreen display, internal memory, and both digital and analog output options.

Key Advantages of APCA-370

1.
Long-Term Stability & Accuracy

NDIR + Purifier

Combines infrared detection with self-cleaning features for dependable, drift-resistant CO₂ monitoring.

2.
Interference-Resistant Measurement

Cross-Flow Modulation

Uses alternating sample/reference cells to ensure accurate readings even in challenging environments.

3.
Low Maintenance Operation

Self-Regenerating Purifier

Zero-gas generation built-in—no need for external reference sources or frequent servicing.

4.
Smart Connectivity & Control

Touchscreen + Data Outputs

Facilitates easy configuration, remote access, and reliable data logging through multiple interface options.

Technical Specifications of APCA-370

Model	Ambient CO₂ Monitor
Measurement target	Carbon dioxide (CO₂) in ambient air
Measuring principle	Cross modulation type non-dispersive infrared absorption method
Range	0 ppm to 500/1000 ppm
Minimum detection sensitivity	0.5 ppm (2σ)
Reproducibility (repeating accuracy)	±1.0% of the full scale
Linearity (readout error)	±2.0%
Zero drift*	±0.1 ppm/day ±2.0 ppm/week
Span drift*	±2.0% of the full scale/day ±3.0% of the full scale/week
Response rate	60 sec or shorter (T₉₀ from the inlet)
Sample collection rate	Approximately 0.7 L/min
Display	Measured value, alarm, time, alarm history, calibration history, etc.
Alarms	Zero calibration, span calibration, etc.