APM 1000

The PM₁₀ Analyser automatically measures and records airborne particulate concentration levels of PM₁₀ (in milligrams or micrograms per cubic meter) using the principle of beta ray attenuation. Each hour, a small ¹⁴C (Carbon-14 or Krypton 85) element emits a constant source of high-energy electrons (known as beta rays) through a spot of clean filter tape. These beta rays are detected and counted by a sensitive scintillation detector to determine a zero reading. The Monitor automatically advances this spot of tape to the sample nozzle, where a vacuum pump then pulls a measured and controlled amount of dust-laden air through the filter tape, loading it with ambient dust. At the end of the hour 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 and the volumetric concentration of particulate matter (PM₁₀) in ambient air. 

Special features:

• Design of gas path keeps filter paper, radioactive source and detector immovable during enrichment and measurement ensuring good lower detection limit
• Cutter, based on simulation verification of aerodynamics, will provide various selection of accurate particle sizes: PM1, PM₁₀,  PM_2.5, TSP
• Use ¹⁴C source which is of low-density , low activity and long half-life to realize stable measurement. No special protection is needed. Reliable and safe. No radioactive contamination will be caused
• Pipeline heating system is used to eliminate interference from ambient humidity and make the detector fit into sudden change of the weather
• Various external ports, such as RS232 / RS485, 4-20 mA and etc.
• USEPA standard beta ray attenuation method, which spares the complicated operations of TEOM, Such as manually replace filter paper and weight. Compared to light scattering method, it has higher measurement accuracy.
• Sampling flow is measured by mass flow sensor and corrected with collected ambient temperature and pressure to get the sampling flow of the field condition.
• Flexible paper-pressing structure. Mechanical driving design is simple and reliable; greatly reduce paper breaking and paper lam and avoid the error sensed by the moving of filter paper.
• Flow control system with precise closed loop feedback; stable sampling flow and small error.
• Low maintenance frequency, once a year.