Ambient Dust Monitor

Particulate matter contaminates our atmosphere in various ways. It can for instance be generated by different industrial production processes,waste combustion, coal mining or automobile exhausts. The APDA-371 automatically measures and records airborne particulate concentration levels (in milligrams or micrograms per cubic meter), using the industry-proven principle of beta ray attenuation. Each hour, a small carbon-14 element emits a constant source of high-energy electrons (known as beta rays) through a spot of clean fillter tape. These beta rays are detected and counted by a sensitive scintillation detector to determine a zero reading. The APDA-371 automatically advances this spot of tape to the sample nozzle, where a vacuum pump then pulls a measured and controlled amount of dust-loaded air through the filter tape. Hourly this dirty spot is placed back between the beta source and the detector thereby causing an attenuation of the beta ray signal which is used to determine the mass of the particulate matter on the filter tape.

The APDA-371 Air Pollution Dust Analyzer for Suspended Particulate Matter (SPM) ensures long term stability and self-diagnostic capabilities as well as efficient collection of fluorine resin tape. The measurement principle operates according to EU and EPA regulations and is also type approved by TueV.



Abteilung: Ambient
Produktionsfirma: HORIBA, Ltd.
Base product: AP-370 series
  • Type Approval according EN 12341 (PM 10)
  • Type Approval according EN 14907 (PM 2.5)
  • 2 months automatic operation without maintenance
  • Low operating costs
  • Hourly check of Zero point, Span point (foil) and drift
  • No annual calibration necessary
  • High accuracy and reliability
  • Hourly filter change reduces the loss of volatile particles
  • No geographical or seasonal corrections necessary
  • Sophisticated heating technology controls relative humidity in the sampling phase
  • Internal memory stores digital data up to 182 days
  • Data retrieval via RS232 or LAN using a PC, modem, printer or data acquisition system


Measurement Principle

Particulate Concentration by Beta Ray Attenuation


PM10 or PM2,5 or TSP Measurement


0-1,000mg/m3(standard), 0-1.000µg/m3

0-100, 200, 250, 500, 2000, 5000, 10.000µg/m3(special application)

Lowest Detection Limit (1h)

< 4,8µg/m3 

Lowest Detection Limit (24h)

< 1,0µg/m3

Measurement cycle time

1 hour

Flow Rate

16,70 liters/minute

Filter Tape

Glass fiber filter

Span Check

Nominally 800µg/cm2

Beta Source

C-14 (carbon-14), 60 μCi ±15 μCi (< 2.22 X 106 Beq), Half-Life 5730 years.

Beta Detector Type

Photomultiplier tube with scintillator

Operation Temperature

0° to +50°C

Ambient Temperature   

-40° to +55°C standard. Optional -50 °C temperature sensors available

Ambient Humidity

0 to 90% RH, non-condensing

Data Interface  

RS-232, LAN connecting terminal(TCP/IP), Analog (0-10V, 4-20mA, 0-16mA)


AC100 - 230 VAC± 10V, 50/60 Hz, approx. 0,4kW


310(H) x 430(W) x 400(D) mm


24.5 kg without Accessories

Air Quality Monitoring
Air Quality Monitoring
During the period of rapid economic growth, Japan was burdened with various types of pollution such as water contamination and air pollution. The first step to regain the glow of the sky and the purity of water was analysis. HORIBA's measuring instruments play an active part in various fields to determine, for example, whether established regulations are complied with or whether the air and water are purified properly. The beautiful environment is the world's asset. Going forward, HORIBA will continue contributing to preserving the global environment through measurement.


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