HJ 653-2013Specifications and Test Procedures for Ambient Air Quality Continuous Automated Monitoring System for PM10 and PM2 - 5 (English PDF)

3.1 Aerodynamic diameter

It refers to the diameter of which the sphere with the unit density (rho0=1g/cm3) reaches the final

settling velocity as actual particle, when it travels with low Reynolds movement in still air.

3.2 Cutter

It refers to the device which has function of separating particles of different diameters.

3.3 50% cut particle-diameter

It refers to the equivalent aerodynamic particle diameter when the trapping efficiency of the cutter

[Translator. the device which cuts particle] to the particulate matter reaches 50%.

3.4 Particulate matter (diameter of particles <=10µm) particulate-matter (PM10)

It refers to the particulate matter with the aerodynamic equivalent diameter in the ambient air less

than or equal to 10µm, which is also known as inhalable particulate matter.

3.5 Particulate matter (diameter of particles <=2.5µm) particulate-matter (PM2.5)

It refers to the particulate matter with the aerodynamic equivalent diameter in the ambient air less

than or equal to 2.5µm, which is also known as fine particulate matter.

3.6 Standard state

The state when the temperature is 273K and pressure is 101.325kPa. Pollutant concentration in this

Standard refers to the concentration under this standard state.

3.7 Reference method

Standard methods issued by the State.

3.8 Geometric standard deviation of trapping efficiency (deltag)

Trapping efficiency of cutter to particulate matter includes the following two statements.

(1) The ratio OF the corresponding particle aerodynamic equivalent diameter Da16 when the

trapping efficiency is 16% WITH the corresponding particle aerodynamic equivalent diameter Da50

when the trapping efficiency is 50%;

(2) The ratio OF the corresponding particle aerodynamic equivalent diameter Da50 when the

trapping efficiency is 50% WITH the corresponding particle aerodynamic equivalent diameter Da80

when the trapping efficiency is 80%.

Both of above two ratios shall meet the requirements of deltag = 1.5 ± 0.1 (PM10) continuous monitoring

system), and deltag = 1.2 ± 0.1 (PM2.5 continuous monitoring system). Calculation refers to Formula (1)

and (2).

Where. deltag -- Geometric standard deviation of trapping efficiency, %;

Da16 -- The equivalent aerodynamic particle diameter when the trapping efficiency of the cutter to the

particulate matter reaches 16%, µm;

Da50 -- The equivalent aerodynamic particle diameter when the trapping efficiency of the cutter to the

particulate matter reaches 50%, µm;

shall meet the requirements of 6.1.2.

7.1.1.2 Static box test method

The tested cutter is mounted in a static box; GENERATE a single size, uniform and stable aerosol;

USE the aerosol detecting instrument to measure the concentration and uniformity of the aerosol;

ENSURE stable aerosol concentration and uniform distribution in the box. USE aerosol detecting

instrument to measure aerosol concentration after being cut by cutter under test. Calculate the

trapping efficiency of particles with different particle-diameters; MATCH the relation between the

trapping efficiency and the particle-diameter to obtain the geometric standard deviation of the

trapping eff...

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