![Page 1: PNC and VPR Validation PMP Meeting 30 th March 2009](https://reader035.vdocuments.us/reader035/viewer/2022062322/5681464e550346895db35f91/html5/thumbnails/1.jpg)
PNC and VPR ValidationPMP Meeting 30th March 2009
Jason Southgate & Ian Marshall
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Objective
To test the practicalities of undertaking the validation of particle
number counters (PNC) and volatile particle removers (VPR), as
specified in the PMP procedures, at a user’s premises rather than
within a specialist aerosol science laboratory.
All the necessary aerosol generation and measurement equipment
was transported to a third party’s premises and the validation was
carried out within their facilities.
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PNC Validation
A local PNC (TSI model 3010D) was compared with a reference
PNC (TSI model 3010, s/n 2005) in accordance with the method
described in the PMP Particle Number Counter Calibration
Procedure (ED47382/PNC, Version 5, December 2007).
Sodium chloride test particles were used in the electrical mobility
diameter range from 70 to 100 nm and the concentration range
from ~700 to ~9,900 particles cm-3.
Particle generation was by an evaporation/condensation method.
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PNC Validation
y = 0.9283x
R2 = 0.9979
0.E+00
1.E+03
2.E+03
3.E+03
4.E+03
5.E+03
6.E+03
7.E+03
8.E+03
9.E+03
1.E+04
0.E+00 1.E+03 2.E+03 3.E+03 4.E+03 5.E+03 6.E+03 7.E+03 8.E+03 9.E+03 1.E+04 1.E+04
Reference PNC (TSI 3010 s/n 2005, # cm-3)
Te
st
PN
C (
TS
I 3
01
0D
, #
cm
-3)
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VPR Validation
A local VPR (Matter Engineering) was validated in accordance with the
method described in the PMP Volatile Particle Remover Calibration
Procedure (ED47382/VPR, Version 5, December 2007), using:
• 91 nm NaCl particles to provide a comparison with existing calibration data from
CAST generated particles (PND1 80°C, ET 300°C, PND2 DR 1).
• 100, 50 and 30 nm NaCl particles across a range of dilution settings (PND1 150°C,
ET 300°C, PND2 DR~12).
• tetracontane particles to determine the volatile particle removal efficiency (single
PNC method).
Particle generation was by an evaporation/condensation method.
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VPR Validation – NaCl/CAST @ 91 nm
0
50
100
150
200
250
300
350
400
450
500
0 20 40 60 80 100 120
Potentiometer Setting (%)
PC
RF Carbon 80°C
NaCl 80°C
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VPR Validation – NaCl/CAST @ 91 nm
y = 0.0007x
R2 = 0.9997
y = 0.0005x
R2 = 0.9998
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0 20 40 60 80 100 120
Potentiometer Setting (%)
1/(
PC
RF
)
Carbon 80°C
NaCl 80°C
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VPR Validation – NaCl @ 100, 50 & 30 nm
0
2000
4000
6000
8000
10000
12000
0 20 40 60 80 100 120
Potentiometer Setting (%)
PC
RF 100 nm
50 nm
30 nm
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VPR Validation – NaCl @100, 50 & 30 nm
y = 4E-05x
R2 = 0.9955
y = 4E-05x
R2 = 0.9957
y = 2E-05x
R2 = 0.9758
0
0.0005
0.001
0.0015
0.002
0.0025
0.003
0.0035
0.004
0.0045
0 20 40 60 80 100 120
Potentiometer Setting (%)
1/(
PC
RF
)
100 nm
50 nm
30 nm
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VPR Validation – NaCl/CAST Comparison
y = 0.0007x
R2 = 0.9997
y = 0.0006x
R2 = 0.9955
y = 0.0005x
R2 = 0.9998
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0 20 40 60 80 100 120
Potentiometer Setting (%)
1/(
PC
RF
)
Carbon 80°C 91 nm
NaCl 150°C 100 nm
NaCl 80°C 91 nm
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VPR Validation - PCRF
Particle Concentration Reduction
Factors
Potentiometer
Setting
(%) fr(100 nm) fr(50 nm) fr(30 nm)
)100(
)50(
nmf
nmf
r
r )100(
)30(
nmf
nmf
r
r
100 244 270 530 1.10 2.17
34 643 891 1234 1.38 1.92
23 923 1382 1676 1.50 1.82
12 1839 2692 3762 1.46 2.05
5 4634 6028 11416 1.30 2.46
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VPR Validation – Volatile Removal
Concentration
(cm-3)
Particles Counted
Upstream 16,256 2,709,323
Downstream
Room Temperature VPR 3,220 536,733
Downstream
Heated VPR 3 47,360
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Conclusions
The performance of the PMP validation procedures at a user’s premises is a practical proposition.
The PNC under test met the acceptance criteria when compared with a reference PNC using sodium chloride test particles.
The VPR under test met the acceptance criteria for volatile removal efficiency using tetracontane test particles.
Sodium chloride particles of 50 and 30 nm diameters did not penetrate the VPR with the expected efficiency, which resulted in particle concentration reduction factors that were significantly greater than anticipated.
Are sodium chloride particles of these diameters generated in this way stable under the temperature conditions experienced within the VPR?