ASTM F888-06(2018)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F888 − 06 (Reapproved 2018)
Standard Test Method for
Measuring Maximum Function Volume of the Primary Dirt
Receptacle in a Vacuum Cleaner
This standard is issued under the fixed designation F888; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.2 Voltage Regulator System, to control the input voltage to
the vacuum cleaner. The regulator system shall be capable of
1.1 This test method covers household types of upright,
maintaining the vacuum cleaners rated voltage of 61 % and
canister, and combination vacuum cleaners.
rated frequency 61 Hz having a wave form that is essentially
1.2 This test method provides a measurement in dry quarts
sinusoidal with 3 % maximum harmonic distortion for the
or litres of the maximum functional volume of the primary dirt
duration of the test.
receptacle when installed in the vacuum cleaner.
4.3 Temperature Measuring Equipment, to provide mea-
1.3 This standard does not purport to address all of the
surements accurate to within 61°F (0.5°C).
safety concerns, if any, associated with its use. It is the
4.4 Humidity Measuring Equipment, to provide measure-
responsibility of the user of this standard to establish appro-
ments accurate to within 62 % relative humidity.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4.5 Adapter, to be attached to the cleaning nozzle of upright
For specific hazards statements see 7.2 and 8.5.
cleaners for use in directing granulated cork into the nozzle.
1.4 This international standard was developed in accor-
See Fig. 1.
dance with internationally recognized principles on standard-
4.6 Volume Measuring Container, to measure volume of
ization established in the Decision on Principles for the
granulated cork. This shall have a capacity of one dry quart.
Development of International Standards, Guides and Recom-
See Fig. 2. The container shall be made of transparent material
mendations issued by the World Trade Organization Technical
to ensure no voids when filled with granulated cork. As an
Barriers to Trade (TBT) Committee.
option, a 1-L container can be used.
2. Referenced Documents
4.7 Weighing Scale—The scale shall be accurate to 0.035 oz
(1 g) and have a weighing capacity of at least 15 lb (6.82 kg).
2.1 SAE Standard:
SAE J726b Air Cleaner Test Code
5. Materials
3. Significance and Use
5.1 New Granulated Cork—Premium Grade 2 mm to 4 mm
3.1 This test method covers a procedure to determine the
size.
maximum functional volume of the primary dirt receptacle
5.2 Coarse-Grade Air Cleaner Test Dust, see Table 1. As an
when installed in the vacuum cleaner.
option, talc may be used. See Table 2.
3.2 This test method provides the maximum amount of test
media that the primary dirt receptacle will hold and may be
6. Sampling
more than the volume obtained when filled to the manufactur-
6.1 Determination of Sample Size—A sample of sufficient
er’s recommended fill line.
size of each model shall be tested until a 90 % confidence level
4. Apparatus is established within 65 % of the mean value. A minimum of
three samples shall be tested. All samples shall be selected at
4.1 Voltmeter, to measure input voltage to the cleaner, to
random in accordance with good statistical practices.
provide measurements accurate to within 61 %.
This test method is under the jurisdiction of ASTM Committee F11 on Vacuum
Cleaners and is the direct responsibility of Subcommittee F11.23 on Filtration. The sole source of supply of the test material known to the committee at this
Current edition approved Oct. 1, 2018. Published November 2018. Originally time is Jelinek Cork Corp., 4500 Witmer Industrial Estates, PMB 167, Niagara Falls,
approved in 2004. Last previous edition approved in 2011 as F888 – 06 (2011). NY 14305–1386. If you are aware of alternative suppliers, please provide this
DOI: 10.1520/F0888-06R18. information to ASTM International Headquarters. Your comments will receive
2 1
Available from Society of Automotive Engineers (SAE), 400 Commonwealth careful consideration at a meeting of the responsible technical committee, which
Dr., Warrendale, PA 15096-0001. you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F888 − 06 (2018)
FIG. 1 Adapter Plate for Uprights
FIG. 2 Volume Measuring Container
A
TABLE 1 Analysis of Coarse Grade Air Cleaner F11 Test Dust TABLE 2 Analysis of Unscented Commercial Grade Talcum
Particle Size Distribution by Volume
Particle Size Distribution
by Weight, %
Size, µm Coarse Grade (% less than)
0.5 % 44µ
5.5 13 ± 3
12.5 % 20–43.9µ
11 24 ± 3
27.0 % 10–19.9µ
22 37 ± 3
23.0 % 5–9.9µ
44 56 ± 3
20.0 % 2–4.9µ
88 84 ± 3
8.0 % 1–1.9µ
176 100
9.0 % 0.9µ
A
The information in Table 1 is contained in “Air Cleaner Test Code,” SAE Technical
Report J726b.
7. Conditioning
7.1 Maintain the test room at 70 6 5°F (216 3°C) and 45
6.2 Determination of Maximum Functional Volume for Each
to 55 % relative humidity.
Unit—The maximum functional volume for each unit shall be
an average of three runs with a spread meeting the repeatability 7.2 Expose all components involved in the test to the
statement in 9.2. (See Appendix X1 for example.) controlled environment for at least 16 h prior to the start of the
F888 − 06 (2018)
FIG. 3 Filling Container for Average Weight
test. (Warning—Store sufficient 100 qt or 100-L increments of 8.2 Prepare the test cleaner as follows:
granulated cork in such a manner that when used they are in a
8.2.1 Install new or clean primary and secondary filters.
state of constant mass/unit volume.)
8.2.2 Prepare the primary dirt receptacle prior to conducting
the measurement test run.
8. Procedure
8.2.2.1 For cleaners using disposable primary filters, use a
8.1 Establish density of granulated cork in grams per dry
new manufacturer’s recommended bag, weigh the filter bag to
quarts or grams per litres as follows:
the nearest 0.035 oz (1.0 g) and install in accordance with the
8.1.1 Weigh the empty container.
manufacturer’s recommended procedure. Repeat this process
8.1.2 Withdraw 100 qt or 100 L from the bulk quantity.
for each test. Preform the filter bag prior to installation to
8.1.3 From the quantity withdrawn in 8.1.2, fill the con-
ensure full installation.
tainer with granulated cork by gently pouring the granulated
8.2.2.2 For cleaners using cloth filter bags or other types of
cork through the funnel shown in Fig. 3. Move the funnel
nondisposable dirt receptacles, empty them in accordance with
around in a horizontal plane to ensure even filling of the
the manufacturer’s instructions after each test run, and clean
container. Do not shake or disturb the container during this
the receptacle until its weight is within 0.14 oz (4 g) of the
operation. Introduce the granulated cork at a uniform rate of 1
previous weight.
qt/min or 1 L/min 610 s.
8.3 Energize the vacuum cleaner for 5 min at its rated
8.1.4 Weigh the filled container.
voltage 61 % and rated frequency 61 Hz. For vacuum
8.1.5 Subtract the results of 8.1.1 from the results of 8.1.4
cleaners with dual nameplate voltage ratings, conduct the
for the weight of 1 qt or 1 L of granulated cork.
testing at the highest voltage.
8.1.6 Set the measured quantity of granulated cork aside.
8.3.1 Place an upright cleaner so that the moving bristles
8.1.7 Repeat 8.1.3 – 8.1.6 ten times. Calculate the mean
clear the supporting surface and no loose dirt is picked up.
weight.
8.3.2 For a straight air canister or combination cleaner,
8.1.8 Return the 10-qt or 10-L samples to the withdrawn
operate with hose only, unrestricted and positioned such that no
quantity of 8.1.2.
loose dirt is picked up.
8.1.9 If testing is completed in the same day by the same
technician, use the mean result of 8.1.7 in subsequent calcula-
8.4 If the test vacuum cleaner contains a disposable or
tions until the quantity withdrawn is depleted. Otherwise,
reusable primary inflatable filter bag, precondition the primary
recalculate the 10-qt mean.
filter bag as follows:
8.1.10 When quantity withdrawn is depleted, select another
8.4.1 Measure and calculate the total primary filtering area
100-qt or 100-L sample in accordance with 8.1.2 – 8.1.9.
excluding seams, joints, treated seal area, mounting means, and
multiple thickness of media. Measure multiple thicknesses that
4 are intended for a specific filtering purpose as a single ply.
A 10 ⁄2-in. diameter utility funnel, Stock No. 78026, has been found suitable for
this purpose. The sole source of supply of the apparatus known to the committee at Open, measure, and take a mean measurement from three bags
this time is U.S. Plastic Corp., 1390 Newbrecht Rd., Lima, OH 45801. If you are
from the same sample as the bags to be tested.
aware of alternative suppliers, please provide this information to ASTM Interna-
8.4.2 Prepare 0.0023 oz of test dust per square inch of
tional Headquarters. Your comments will receive careful consideration at a meeting
of the responsible technical committee, which you may attend. primary filter area (0.010 g/cm ) (see Table 1 and Table 2).
F888 − 06 (2018)
FIG. 4 Test Set-up
Feed the test dust at the rate of 0.7 6 0.07 oz/min (20 6 2 8.6.3 For canister and combination cleaners, feed the granu-
g/min) into the intake port to inflate the bag. lated cork through the hose accompanying the model being
8.4.3 If the test vacuum cleaner does not contain a dispos- tested. The hose and cleaner must be placed in such a manner
able or reusable primary inflatable filter bag, the primary filter that their position will allow a uniform pickup from the
does not need to be preconditioned as in 8.4.1 and 8.4.2. container (see Fig. 4).
8.5 Testing has shown that the test media, granulated cork,
8.7 De-energize the cleaner after it will accept no more
can be reused a maximum of ten times without affecting the granulated cork.
maximum functional volume measurement. (Warning—If
8.7.1 For bagless or hard dirt receptacle cleaners, de-
granulated cork is reused, the density in grams per dry quarts
energize the cleaner after the granulated cork reaches the
or grams per litres must be reestablished (see 8.1 – 8.1.10).)
receptacle “full line.” If the receptacle has no “full line,”
continue the test until the cleaner will accept no more granu-
8.6 Introduce the granulated cork at a uniform rate of 1
lated cork. Do not include any granulated cork remaining
qt/min or 1 L/min 610 s into the vacuum cleaner in accordance
outside the dirt receptacle in the maximum functional volume
with 8.6.1, 8.6.2, or 8.6.3.
measurement.
8.6.1 For an upright cleaner, without attached hose or
attachment port, feed the granulated cork through the adapter
8.8 Carefully remove the primary dirt receptacle containing
on the nozzle. Use only adapter shown in Fig. 1 or equivalent.
the collected granulated cork. Do not include any granulated
The handle of the upright cleaner should be placed in the
cork remaining outside the primary dirt receptacle system,
position specified in the instruction book for above-the-floor
including the delivery tube, in the maximum functional volume
cleaning.
measurement.
8.6.2 For an upright cleaner with attached hose or attach-
8.9 Weigh the primary dirt receptacle and collected granu-
ment port, feed the granulated cork through hose attached or
lated cork.
the hose provided for the attachment port. The handle of the
upright cleaner should be placed in the position specified in the 8.10 Calculate the weight of granulated cork collected in the
instruction book for above-the-floor cleaning. primary dirt receptacle by subtracting the dirt receptacle and
F888 − 06 (2018)
TABLE 3 Repeatability and Reproducibility
Type Standard Deviation Repeatability, Standard Deviation Reproducibility
Cleaner of Repeatability, S r of Reproducibility, S Limit, R
r R
Bagless Upright Vacuum 0.07 0.21 0.19 0.52
Bagged Vacuum 0.10 0.28 0.47 1.32
test dust weight (if added) as described in 8.2.2 and 8.4.2 from 9.2.1 The 95 % repeatability limit within a laboratory, r, has
the full dirt receptacle weight (see 8.9). Calculate the maxi- been found to be the respective values listed in Table 1, where
mum functional volume by dividing the total weight of r = 2.8(S ).
r
collected granulated cork by the average weight of granulated 9.2.2 With 95 % confidence, it can be stated that within a
cork per quart or litre in accordance with 8.1. laboratory, a set of measured results derived from testing a unit
should be considered suspect if the difference between any two
8.11 Record the maximum functional volume in dry quarts
of the three values is greater than the respective values of the
or litres to the nearest tenth.
repeatability limit, r, listed in Table 3.
8.12 The maximum functional volume for a single test is the
9.3 Reproducibility (multi-laboratory)—The expected stan-
number of quarts or litres of granulated cork collected by the
dard deviation of reproducibility of the average of a set of
primary dirt receptacle. The maximum functional volume of a
measured results between multiple laboratories, S , has been
R
given vacuum cleaner is the mean value of three tests meeting
found to be the respective values listed in Table 3.
the repeatability statements specified in 9.2. (See Appendix X1
9.3.1 The 95 % reproducibility limit within a laboratory, R,
for example.)
has been found to be the respective values listed in Table 3,
9. Precision and Bias where R = 2.8(S ).
R
9.3.2 With 95 % confidence, it can be stated that the average
9.1 Precision—For bagged vacuums, these statements are
of the measured results from a set of three test runs performed
based on an interlaboratory test involving twelve laboratories
in one laboratory, as compared to a second laboratory, should
and four units. The range of maximum functional volume of
5 be considered suspect if the difference between those two
the units was from 0.90 to 9.4 dry quarts. For bagless upright
values is greater than the respective values of the reproducibil-
vacuums only, these statements are based on an interlaboratory
ity limit, R, listed in Table 3.
test involving twelve laboratories and four units. The range of
9.3.3 If the absolute value of the difference between the
maximum functional volume of the units was from 1.12 to 2.23
5,6 average of the
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F888 − 06 (Reapproved 2011) F888 − 06 (Reapproved 2018)An American National Standard
Standard Test Method for
Measuring Maximum Function Volume of the Primary Dirt
Receptacle in a Vacuum Cleaner
This standard is issued under the fixed designation F888; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers household types of upright, canister, and combination vacuum cleaners.
1.2 This test method provides a measurement in dry quarts or litres of the maximum functional volume of the primary dirt
receptacle when installed in the vacuum cleaner.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. For specific hazards statements see 7.2 and 8.5.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 SAE Standard:
SAE J726b Air Cleaner Test Code
3. Significance and Use
3.1 This test method covers a procedure to determine the maximum functional volume of the primary dirt receptacle when
installed in the vacuum cleaner.
3.2 This test method provides the maximum amount of test media that the primary dirt receptacle will hold and may be more
than the volume obtained when filled to the manufacturer’s recommended fill line.
4. Apparatus
4.1 Voltmeter, to measure input voltage to the cleaner, to provide measurements accurate to within 61 %.
4.2 Voltage Regulator System, to control the input voltage to the vacuum cleaner. The regulator system shall be capable of
maintaining the vacuum cleaners rated voltage of 61 % and rated frequency 61 Hz having a wave form that is essentially
sinusoidal with 3 % maximum harmonic distortion for the duration of the test.
4.3 Temperature Measuring Equipment, to provide measurements accurate to within 61°F (0.5°C).
4.4 Humidity Measuring Equipment, to provide measurements accurate to within 62 % relative humidity.
4.5 Adapter, to be attached to the cleaning nozzle of upright cleaners for use in directing granulated cork into the nozzle. See
Fig. 1.
4.6 Volume Measuring Container, to measure volume of granulated cork. This shall have a capacity of one dry quart. See Fig.
2. The container shall be made of transparent material to ensure no voids when filled with granulated cork. As an option, a 1-L
container can be used.
4.7 Weighing Scale—The scale shall be accurate to 0.035 oz (1 g) and have a weighing capacity of at least 15 lb (6.82 kg).
This test method is under the jurisdiction of ASTM Committee F11 on Vacuum Cleaners and is the direct responsibility of Subcommittee F11.23 on Filtration.
Current edition approved Nov. 1, 2011Oct. 1, 2018. Published March 2012November 2018. Originally approved in 2004. Last previous edition approved in 20062011 as
F888 – 06.F888 – 06 (2011). DOI: 10.1520/F0888-06R11.10.1520/F0888-06R18.
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F888 − 06 (2018)
FIG. 1 Adapter Plate for Uprights
FIG. 2 Volume Measuring Container
5. Materials
5.1 New Granulated Cork—Premium Grade 2 mm to 4 mm size.
5.2 Coarse-Grade Air Cleaner Test Dust, see Table 1. As an option, talc may be used. See Table 2.
6. Sampling
6.1 Determination of Sample Size—A sample of sufficient size of each model shall be tested until a 90 % confidence level is
established within 65 % of the mean value. A minimum of three samples shall be tested. All samples shall be selected at random
in accordance with good statistical practices.
6.2 Determination of Maximum Functional Volume for Each Unit—The maximum functional volume for each unit shall be an
average of three runs with a spread meeting the repeatability statement in 9.2. (See Appendix X1 for example.)
The sole source of supply of the test material known to the committee at this time is Jelinek Cork Corp., 4500 Witmer Industrial Estates, PMB 167, Niagara Falls, NY
14305–1386. If you are aware of alternative suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration
at a meeting of the responsible technical committee, which you may attend.
F888 − 06 (2018)
A
TABLE 1 Analysis of Coarse Grade Air Cleaner F11 Test Dust
Particle Size Distribution by Volume
Size, μm Coarse Grade (% less than)
5.5 13 ± 3
11 24 ± 3
22 37 ± 3
44 56 ± 3
88 84 ± 3
176 100
A
The information in Table 1 is contained in “Air Cleaner Test Code,” SAE Technical
Report J726b.
TABLE 2 Analysis of Unscented Commercial Grade Talcum
Particle Size Distribution
by Weight, %
0.5 % 44μ
12.5 % 20–43.9μ
27.0 % 10–19.9μ
23.0 % 5–9.9μ
20.0 % 2–4.9μ
8.0 % 1–1.9μ
9.0 % 0.9μ
7. Conditioning
7.1 Maintain the test room at 70 6 5°F (216 3°C) and 45 to 55 % relative humidity.
7.2 Expose all components involved in the test to the controlled environment for at least 16 h prior to the start of the test.
(Warning—Store sufficient 100 qt or 100-L increments of granulated cork in such a manner that when used they are in a state of
constant mass/unit volume.)
8. Procedure
8.1 Establish density of granulated cork in grams per dry quarts or grams per litres as follows:
8.1.1 Weigh the empty container.
8.1.2 Withdraw 100 qt or 100 L from the bulk quantity.
8.1.3 From the quantity withdrawn in 8.1.2, fill the container with granulated cork by gently pouring the granulated cork through
the funnel shown in Fig. 3. Move the funnel around in a horizontal plane to ensure even filling of the container. Do not shake
or disturb the container during this operation. Introduce the granulated cork at a uniform rate of 1 qt/min or 1 L/min 610 s.
8.1.4 Weigh the filled container.
8.1.5 Subtract the results of 8.1.1 from the results of 8.1.4 for the weight of 1 qt or 1 L of granulated cork.
8.1.6 Set the measured quantity of granulated cork aside.
8.1.7 Repeat 8.1.3 – 8.1.6 ten times. Calculate the mean weight.
8.1.8 Return the 10-qt or 10-L samples to the withdrawn quantity of 8.1.2.
8.1.9 If testing is completed in the same day by the same technician, use the mean result of 8.1.7 in subsequent calculations until
the quantity withdrawn is depleted. Otherwise, recalculate the 10-qt mean.
8.1.10 When quantity withdrawn is depleted, select another 100-qt or 100-L sample in accordance with 8.1.2 – 8.1.9.
8.2 Prepare the test cleaner as follows:
8.2.1 Install new or clean primary and secondary filters.
8.2.2 Prepare the primary dirt receptacle prior to conducting the measurement test run.
8.2.2.1 For cleaners using disposable primary filters, use a new manufacturer’s recommended bag, weigh the filter bag to the
nearest 0.035 oz (1.0 g) and install in accordance with the manufacturer’s recommended procedure. Repeat this process for each
test. Preform the filter bag prior to installation to ensure full installation.
8.2.2.2 For cleaners using cloth filter bags or other types of nondisposable dirt receptacles, empty them in accordance with the
manufacturer’s instructions after each test run, and clean the receptacle until its weight is within 0.14 oz (4 g) of the previous
weight.
8.3 Energize the vacuum cleaner for 5 min at it’sits rated voltage 61 % and rated frequency 61 Hz. For vacuum cleaners with
dual nameplate voltage ratings, conduct the testing at the highest voltage.
4 1
A10A 10 ⁄2-in. diameter utility funnel, Stock No. 78026, has been found suitable for this purpose. The sole source of supply of the apparatus known to the committee
at this time is U.S. Plastic Corp., 1390 Newbrecht Rd., Lima, OH 45801. If you are aware of alternative suppliers, please provide this information to ASTM International
Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
F888 − 06 (2018)
FIG. 3 Filling Container for Average Weight
FIG. 4 Test Set-up
8.3.1 Place an upright cleaner so that the moving bristles clear the supporting surface and no loose dirt is picked up.
8.3.2 For a straight air canister or combination cleaner, operate with hose only, unrestricted and positioned such that no loose
dirt is picked up.
F888 − 06 (2018)
8.4 If the test vacuum cleaner contains a disposable or reusable primary inflatable filter bag, precondition the primary filter bag
as follows:
8.4.1 Measure and calculate the total primary filtering area excluding seams, joints, treated seal area, mounting means, and
multiple thickness of media. Measure multiple thicknesses that are intended for a specific filtering purpose as a single ply. Open,
measure, and take a mean measurement from three bags from the same sample as the bags to be tested.
8.4.2 Prepare 0.0023 oz of test dust per square inch of primary filter area (0.010 g/cm ) (see Table 1 and Table 2). Feed the test
dust at the rate of 0.7 6 0.07 oz/min (20 6 2 g/min) into the intake port to inflate the bag.
8.4.3 If the test vacuum cleaner does not contain a disposable or reusable primary inflatable filter bag, the primary filter does
not need to be preconditioned as in 8.4.1 and 8.4.2.
8.5 Testing has shown that the test media, granulated cork, can be reused a maximum of ten times without affecting the
maximum functional volume measurement. (Warning—If granulated cork is reused, the density in grams per dry quarts or grams
per litres must be reestablished (see 8.1 – 8.1.10).)
8.6 Introduce the granulated cork at a uniform rate of 1 qt/min or 1 L/min 610 s into the vacuum cleaner in accordance with
8.6.1, 8.6.2, or 8.6.3.
8.6.1 For an upright cleaner, without attached hose or attachment port, feed the granulated cork through the adapter on the
nozzle. Use only adapter shown in Fig. 1 or equivalent. The handle of the upright cleaner should be placed in the position specified
in the instruction book for above-the-floor cleaning.
8.6.2 For an upright cleaner with attached hose or attachment port, feed the granulated cork through hose attached or the hose
provided for the attachment port. The handle of the upright cleaner should be placed in the position specified in the instruction book
for above-the-floor cleaning.
8.6.3 For canister and combination cleaners, feed the granulated cork through the hose accompanying the model being tested.
The hose and cleaner must be placed in such a manner that their position will allow a uniform pickup from the container (see Fig.
4).
8.7 De-energize the cleaner after it will accept no more granulated cork.
8.7.1 For bagless or hard dirt receptacle cleaners, de-energize the cleaner after the granulated cork reaches the receptacle “full
line.” If the receptacle has no “full line,” continue the test until the cleaner will accept no more granulated cork. Do not include
any granulated cork remaining outside the dirt receptacle in the maximum functional volume measurement.
8.8 Carefully remove the primary dirt receptacle containing the collected granulated cork. Do not include any granulated cork
remaining outside the primary dirt receptacle system, including the delivery tube, in the maximum functional volume
measurement.
8.9 Weigh the primary dirt receptacle and collected granulated cork.
8.10 Calculate the weight of granulated cork collected in the primary dirt receptacle by subtracting the dirt receptacle and test
dust weight (if added) as described in 8.2.2 and 8.4.2 from the full dirt receptacle weight (see 8.9). Calculate the maximum
functional volume by dividing the total weight of collected granulated cork by the average weight of granulated cork per quart or
litre in accordance with 8.1.
8.11 Record the maximum functional volume in dry quarts or litres to the nearest tenth.
8.12 The maximum functional volume for a single test is the number of quarts or litres of granulated cork collected by the
primary dirt receptacle. The maximum functional volume of a given vacuum cleaner is the mean value of three tests meeting the
repeatability statements specified in 9.2. (See Appendix X1 for example.)
9. Precision and Bias
9.1 Precision—For bagged vacuums, these statements are based on an interlaboratory test involving twelve laboratories and four
units. The range of maximum functional volume of the units was from 0.90 to 9.4 dry quarts. For bagless upright vacuums only,
these statements are based on an interlaboratory test involving twelve laboratories and four units. The range of maximum
5,6
functional volume of the units was from 1.12 to 2.23 dry quarts. No data is currently available to make statements concerning
the precision of other types of bagless vacuums.
9.2 Repeatability (single-operator-laboratory)—The expected standard deviation of repeatability of the measured results within
a laboratory, S , has been found to be the respective values listed in Table 3.
r
9.2.1 The 95 % repeatability limit within a laboratory, r, has been found to be the respective values listed in Table 1, where
r = 2.8(S ).
r
9.2.2 With 95 % confidence, it can be stated that within a laboratory, a set of measured results derived from testing a unit should
be considered suspect if the difference between any two of the three values is greater than the respective values of the repeatability
limit, r, listed in Table 3.
Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:F11-1004.
Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:F11-1016.
F888 − 06 (2018)
TABLE 3 Repeatability and Reproducibilit
...