ASTM F649-01

Standard Practice for Secondary Calibration of Airborne Particle Counter Using Comparison Procedures (Withdrawn 2007)

SCOPE
1.1 This practice covers procedures for adjusting the size ranges of an airborne discrete particle counter (DPC) to match size/concentration data from a reference DPC that has been calibrated for counting and sizing accuracy in accordance with Practice F 328 and is kept in good working order. The practice is applied in situations where time, capabilities, or both, required for carrying out procedures in Practice F 328 are not available. It is particularly useful where more than one DPC may be required to observe an environment where the particulate material being counted and sized is different in composition from the precision spherical particulate materials used for calibration in Practice F 328 and/or all of the DPCs in use are not similar in optical or electronic design.
1.2 Procedures covered here include those to measure sampled and observed air volume or flow rate, zero count level, particle sizing and counting accuracy, particle sizing resolution, particle counting efficiency, and particle concentration limit.
WITHDRAWN RATIONALE
This practice covers procedures for adjusting the size ranges of an airborne discrete particle counter (DPC) to match size/concentration data from a reference DPC that has been calibrated for counting and sizing accuracy in accordance with Practice F 328 and is kept in good working order. The practice is applied in situations where time, capabilities, or both, required for carrying out procedures in Practice F 328 are not available. It is particularly useful where more than one DPC may be required to observe an environment where the particulate material being counted and sized is different in composition from the precision spherical particulate materials used for calibration in Practice F 328 or all of the DPCs in use or both are not similar in optical or electronic design.
Formerly under the jurisdiction of Committee E29 on Particle and Spray Characterization, this practice was withdrawn without replacement in May 2007 due to its limited use by the industry.

General Information

• Status: Withdrawn
• Publication Date: 09-May-2001
• Withdrawal Date: 31-Mar-2007
• ICS: 17.020 - Metrology and measurement in general
• Technical Committee: E29 - Particle and Spray Characterization
• Drafting Committee: E29.02 - Non-Sieving Methods

Relations

• Replaces: ASTM F649-80(1999) - Standard Practice for Secondary Calibration of Airborne Particle Counter Using Comparison Procedures
• Effective Date: 10-May-2001
• Referred By: ASTM F50-21 - Standard Practice for Continuous Sizing and Counting of Airborne Particles in Dust-Controlled Areas and Clean Rooms Using Instruments Capable of Detecting Single Sub-Micrometre and Larger Particles
• Effective Date: 10-May-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F649–01
Standard Practice for
Secondary Calibration of Airborne Particle Counter Using
1
Comparison Procedures
This standard is issued under the fixed designation F 649; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Summary of Practice
1.1 This practice covers procedures for adjusting the size 3.1 The DPC under test is used to sample from an environ-
ranges of an airborne discrete particle counter (DPC) to match ment containing polydisperse aerosol whose nature is that
size/concentration data from a reference DPC that has been anticipated where the DPC will be used.At the same time, the
calibrated for counting and sizing accuracy in accordance with reference DPC that has been calibrated in accordance with
Practice F 328 and is kept in good working order. The practice Practice F 328, and maintained in good working order, is used
is applied in situations where time, capabilities, or both, to sample from the same environment. The size range settings
required for carrying out procedures in Practice F 328 are not of the DPC(s) under test are adjusted so that the reported
available. It is particularly useful where more than one DPC concentration data are in good agreement with the data
may be required to observe an environment where the particu- produced by the reference DPC.
late material being counted and sized is different in composi-
4. Significance
tion from the precision spherical particulate materials used for
4.1 In some measurements, two or more DPCs must be
calibration in Practice F 328 and/or all of the DPCs in use are
not similar in optical or electronic design. used. Operators have noted that differing results may be
obtained by two DPCs sampling the same air parcel, even
1.2 Procedures covered here include those to measure
sampledandobservedairvolumeorflowrate,zerocountlevel, when the DPCs have been recently been placed in good
operating order and are operating within their design specifi-
particle sizing and counting accuracy, particle sizing resolu-
tion, particle counting efficiency, and particle concentration cations.
4.2 Identicalorcloselysimilardataarenotdevelopedbythe
limit.
DPCsasaresultofseveralpossiblecauses.Themostimportant
2. Referenced Documents
is the difference between the ambient aerosol and the calibra-
2.1 ASTM Standards: tion aerosol in terms of both composition and particle size
F 328 Practice for Calibration of an Airborne Particle distribution. Another cause is variation in design and perfor-
2
Counter Using Monodisperse Spherical Particles mance between the two DPCs. Still another cause is normal
E 20 Practice for Particle Size Analysis of Particulate Sub- samplevarianceandtheeffectsofpossibledifferenceinsample
stances in the Range of 0.2µm to 75 µm by Optical size. Thus, even with good sample handling procedure, these
3
Microscopy causes may result in differences of up to an order of magnitude
2.2 IEST Standard: in concentrations reported by two or more DPCs.
4
IEST RP-CC001.3 HEPA and ULPA Filters
NOTE 1—A more detailed discussion of these factors is given in
Appendix X1.
1
This practice is under the jurisdiction ofASTM Committee E29 on Particle and 5. Interferences
Spray Characterizationand is the direct responsibility of Subcommittee E29.02on
5.1 Since the DPC is typically a high-sensitivity device,
Non-Sieving Methods.
radio frequency or electromagnetic interference may affect it.
Current edition approved May 10, 2001. Published June 2001. Originally
published as F 649 - 80. Last previous edition F 649 - 80 (1999)
Precautions should be taken to ensure that the test area
2
Annual Book of ASTM Standards, Vol 14.02.
environment does not exceed the RFE-EMI capabilities of the
3
Discontinued; see 1993 Annual Book of ASTM Standards, Vol 14.02.
4 DPC. Electronic or operational verification can be made, such
Available from Institute of Environmental Sciences and Technology, 940 E.
Northwest Hwy., Mt. Prospect, IL 60056–3444. as indication of acceptable background level data reported.
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F649
6. Apparatus 8. Calibration and Standardization
8.1 The DPC under test should be in good operating order.
6.1 ReferenceDPC—This DPC should have been calibrated
Reference to the manufacturer’s primary calibration data and
within the last 6-month period in accordance with Practice
standardize the operating levels of the instrument in accor-
F 328 and maintained in good operating order. It is r
...