Description
The PMFT 1000 F tests respiratory protection particle filters better than the standards EN 143, ISO 16900-3 and NIOSH 42 CFR 84 with additional accurate analysis of filter mask efficiency for SARS-CoV-2 (size approximately 120 nm to 160 nm). In addition, the testing of face masks based on the EN 149/ISO 13274-7 standards is possible. Both total photometric penetration and fractional efficiency are tested e.g., the efficiency in the whole size range respectively the particle size-dependent penetration.
The PMFT 1000 F is equipped with aerosol generators for measuring penetration with oil and salt. Measurement procedures for quick quality control (short test) or for testing according to standard (exposure test) are supplied. Corona discharge with CD 2000 A is integrated.
Operation and automatic printout of the measurement results are therefore easy even for inexperienced users.
The measurement of total penetration and penetration via particle size is carried out with the high-precision aerosol photometer Promo LED 2300. An automatic switch allows efficiency measurements without dilution up to 99.9995 %.
The size distribution of the test aerosol according to the standard is as follows:
EN 143
Oil: Media diameter ca. 160 nm | Geom. standard deviation ~ 2
Salt: Media diameter ca. 60 nm | Geom. standard deviation ~ 1.9
ISO 16900-3
Oil: Media diameter 190 nm | Geom. standard deviation 1.4 – 1.8
Salt: Media diameter 80 nm | Geom. standard deviation 1.4 – 1.8
42 CFR 84
Oil: Media diameter 200 nm | Geom. standard deviation <1.6
Salt: Media diameter 55 nm | Geom. standard deviation <1.86
Based on the measurement of the particle penetration via the particle size, the PMFT can also be used to consider the tolerances in the particle size distribution according to EN 13274-7 as min. / max. penetration value.
Overview of standards for filter testing of personal protection masks
|
EN 143
|
EN 143
|
ISO 16900-3
|
ISO 16900-3
|
42 CFR 84
|
42 CFR 84
|
|
|---|---|---|---|---|---|---|
|
Aerosol
|
NaCl
|
PaO
|
NaCl
|
PaO
|
NaCl
|
DOP
|
|
Mean diameter
|
approx. 0.06 µm
|
approx. 0.16 µm
|
0.06 – 0.1 µm
|
0.16 – 0.21 µm
|
0.055 – 0.095 µm
|
0.165 – 0.205 µm
|
|
Standard deviation
|
approx. 1.9
|
approx. 2
|
1.4 – 1.8
|
1.4 – 1.8
|
< 1.86 (by additional software module)
|
< 1.6 (by additional software module)
|
|
Concentration
|
4 –12 mg/m³
|
15 – 35 mg/m³
|
8 – 35 mg/m³
|
15 – 35 mg/m³
|
< 200 mg/m³
|
< 200 mg/m³
|
|
Discharge
|
required
|
–
|
required
|
–
|
required
|
required
|
|
Air flow
|
95 l/min
|
95 l/min
|
to be defined
|
to be defined
|
85 ± 4 l/min
|
85 ± 4 l/min
|
|
Temperature
|
22 ± 3 °C
|
24 ± 8 °C
|
22 ± 3 °C
|
24 ± 8 °C
|
25 ± 5 °C
|
25 ± 5 °C
|
|
Rel. humidity< 40 %
|
< 40 %
|
20 – 80 %
|
< 40 %
|
20 – 80 % |
20 – 40 % (by compressed air) |
20 – 40 % (by compressed air) |
|
Measurement device
|
Sodium flame photometer
|
Light scattering photometer |
Sodium flame photometer |
Light scattering photometer |
Light scattering photometer |
Light scattering photometer |
|
Measuring time
|
30 s
|
30 s
|
30 s
|
30 s |
lowest eff. during loading |
lowest eff. during loading |
|
Pause time
|
180 s
|
180 s
|
180 s
|
180 s |
lowest eff. during loading |
lowest eff. during loading |
|
Exposition
|
120 mg
|
120 mg
|
150 mg
|
150 mg |
200 ± 5 mg |
200 ± 5 mg |
|
PMFT remarks
|
O.K. |
O.K. |
O.K. |
O.K. |
O.K. |
O.K. |
