Carbon Monoxide Monitor

For Your Needs in Air Quality Monitoring

The APMA-380 is an analyzer for measuring carbon monoxide in ambient air and other background gases, for air quality control as well as for variety of industrial applications. HORIBA's state-of-the-art NDIR technology enables high sensitivity and stable real-time continuous measurement.

Division: Ambient
Manufacturing Company: HORIBA, Ltd.

 Ultimate Performance

  • Cross-modulation NDIR technology provides excellent sensitivity, stability and robustness
  • Real-time continuous measurement
  • Wide measurement range with up to 6 ranges selectable, minimum 0-5 ppm and maximum 0-300 ppm
  • Compensation detector adopted for elimination of interference by coexisting gases
  • Enhanced Lower Detection Limit and response time


User-Friendly Interface & Functionality

  • Durable 7-inch wide color touch screen LCD with intuitive interface and trend graph
  • Selectable metrics (ppb, μg/m3, ppm, mg/m3), response time (moving average value), and calculation method
  • Programmable dilution ratio
  • Dust filter accessible from the front panel for easy daily maintenance


       Trend Graph Screen    Dust Filter


Reduced Operational Expense & Maximum Uptime

  • Remote diagnostics allow fast and effective maintenance
  • Internal parts timer with alarm facilitates timely parts replacement, optimizing parts stock
  • Module design enables easy and fast replacement at field
  • High-quality, long lifetime parts for maximum uptime


 Connected & Intelligent

  • Remote operation from various devices: PC, tablet or smartphone
  • Modbus® TCP and RTU communication
  • USB flash drive for data storage

* Standard specification is wired LAN connection. For wireless connection, separate device is required.

Connected & Intelligent


Module Design for Various Needs & Customizations

  • Each standalone module, powered by DC 24 V, is capable of providing measurement results
  • Customizable for stationary, wall mount, mobile or portable installations
  • Easy integration of multiple AP-380 measurement modules into air quality monitoring station or dilution continuous emission monitoring station (CEMS)


Environment-Friendly Design

  • Remote operation reduces emission from transportation, contributing to the reduction of carbon footprint
  • Approx. 15%* reduction in power consumption
  • Long life parts reduce environmental load

      * In-house comparison with previous model.


Related products

Ozone Monitor

Sulfur Dioxide Monitor

Hydrocarbon Monitor

Nitrogen Oxides Monitor


■ APMA-380 Specifications

ComponentCarbon monoxide (CO)
Measuring principleCross-Modulation Non-Dispersive Infrared Absorption (NDIR)
Measurement range0-5/10/20/50/100/300 ppm (up to 6 ranges selectable, auto-range)
Lower Detection Limit (2σ)< 0.02 ppm*1
Measurement unitppb, μg/m3, ppm, mg/m3
Sample gas flow rateApprox. 1.5 L/min
Repeatability±1.0% of full scale
Linearity±1.0% of full scale
Zero drift< 0.02 ppm (24 h)
Span drift< 0.5% of full scale (24 h)
Response time (T95)< 30 s from the inlet*1
Display7-inch color LCD with touch panel
CommunicationEthernet × 2 (Modbus® TCP), RS-232C × 1 (Modbus® RTU) , USB flash drive × 1
Analog output (option)Maximum : 3 channels (insulated)
DC 4-20 mA, DC 0-0.1 V, DC 0-1 V, DC 0-5 V or DC 0-10 V
Digital output (option)Relay contact output for range 3 channels, relay contact output for other 6 channels
Digital input (option)Maximum : 4 channels, non-isolated input
Installation environmentOperation temperature : 0-40°C (32°F - 104°F), relative humidity : 85% or less
Temperature and pressure compensationWith
Sampling pump and filterInternal
Power requirementsAC 100-240 V±10% (max. voltage: AC 250 V), 50/60 Hz, consumption 90 W
Dimensions, weight430 (W) x 568 (D) x 221 (H) mm, Approx. 16 kg
ComplianceCE, UKCA, KC, FCC, China RoHS

*1 : Digital filter
・If there is other measurement range requirement than shown above, please consult HORIBA
・Modbus is a trademark of Schneider Electric USA Inc.


■ Dimensional Outline (Unit: mm)


■ Rear Panel Configuration

1. Zero calibration gas inlet(option)                 6. AC power connector
2. Span calibration gas inlet(option)                7. I/O terminal block
3. Exhaust                                                    8. USB flash drive connector
4. Sample gas inlet                                       9. Ethernet connector
5. Guide label                                             10. RS-232C connector


■ Flow Sheet


■ Options

▪ I/O terminal block (Analog input/output, digital input/output)
▪ Pressurized calibration unit  ▪ Flow sensor  ▪ USB flash drive
▪ Mounting parts (rubber feet, brackets and slide rails, brackets for slide rails)

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