ASTM C1789-14
(Test Method)Standard Test Method for Calibration of Hand-Held Moisture Meters on Gypsum Panels
Standard Test Method for Calibration of Hand-Held Moisture Meters on Gypsum Panels
SIGNIFICANCE AND USE
5.1 This Standard Test Method is intended for use in calibrating hand-held meters to accurately read from approximately 30 to 90% ERH. Moisture content is related to the ERH or water activity of a material.
5.2 Hand-held meters provide a rapid means of sampling the moisture content of gypsum boards and panels during manufacture and for field inspection during and after building construction. However, these measurements are inferential, that is, electrical parameters are measured and compared against a calibration curve to obtain an indirect measure of moisture content. The electrical measurements are influenced by the actual moisture content, a number of other gypsum board and panel variables, environmental conditions, the geometry of the measuring probe, and the design of the meter. The maximum accuracy can only be obtained by an awareness of the effect of each parameter on the meter output and correction of readings as specified by these test methods.
5.3 Electrical conductance and dielectric meters are not necessarily equivalent in their readings under the same conditions. When this test method is referenced, the type of meter that is being used must be reported with the relevant ranges for precision and bias as specified in this standard.
5.4 Both types of meters are to be calibrated with respect to ERH as described in this standard.
SCOPE
1.1 This test method applies to the calibration of handheld moisture meters for gypsum board, glass faced gypsum panels and fiber-reinforced gypsum panels by means of electrical conductance and dielectric meters. The test uses wetted test specimens which are dried down in at least 5 steps to determine the moisture content based on the weight loss in comparison to the dry weight. The test also supplies the ERH values for each of the drying steps.
1.2 This test method has not been evaluated for the influence of paint or wall covering materials on the indicated moisture content of a gypsum board or panel substrate.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: C1789 − 14
Standard Test Method for
Calibration of Hand-Held Moisture Meters on Gypsum
1
Panels
This standard is issued under the fixed designation C1789; 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.
3
1. Scope 2.2 ASHRAE Standard:
2009 ASHRAE Handbook – Fundamentals, Chapter 1 –
1.1 This test method applies to the calibration of handheld
Psychrometrics,American Society of Heating, Refrigerat-
moisture meters for gypsum board, glass faced gypsum panels
ing and Air-conditioning Engineers
and fiber-reinforced gypsum panels by means of electrical
conductance and dielectric meters. The test uses wetted test
3. Terminology
specimenswhicharedrieddowninatleast5stepstodetermine
3.1 Definitions of Terms Specific to This Standard:
the moisture content based on the weight loss in comparison to
the dry weight. The test also supplies the ERH values for each 3.1.1 absolutehumidity,d,n—theratioofthemassofwater
v
vapor to the total volume of the moist air sample.
of the drying steps.
3.1.2 admittance, n—inverse of impedance, a measure of
1.2 This test method has not been evaluated for the influ-
how easily an electric current can flow through a material.
ence of paint or wall covering materials on the indicated
moisture content of a gypsum board or panel substrate.
3.1.3 conductance meters, n—conductance meters are those
that measure predominantly ionic conductance between points
1.3 This standard does not purport to address all of the
of applied voltage, usually dc.
safety concerns, if any, associated with its use. It is the
3.1.3.1 Discussion—Conductance meters generally have
responsibility of the user of this standard to establish appro-
pins that penetrate into the material being measured. Direct-
priate safety and health practices and determine the applica-
current conductance meters are commonly referred to as
bility of regulatory limitations prior to use.
"resistance" meters. Most commercial conductance meters are
12 4 12
2. Referenced Documents high-input impedance (about 10 Ω), wide-range (10 to 10
2 Ω) ohmmeters. Their scales are generally calibrated to read
2.1 ASTM Standards:
directly in moisture content (oven-dry mass basis) for a
C473 Test Methods for Physical Testing of Gypsum Panel
particular calibration material and at a specific reference
Products
temperature.
C1177 Specification for Glass Mat Gypsum Substrate for
3.1.4 dew-point temperature, t,n—the temperature at
Use as Sheathing
d
C1178 Specification for Coated Glass Mat Water-Resistant which a sample of moist air being cooled at constant pressure
and moisture content reaches 100 percent relative humidity.
Gypsum Backing Panel
C1278 Specification for Fiber-Reinforced Gypsum Panel 3.1.4.1 Discussion—The dew-point temperature is the tem-
perature at which water condensation begins to occur on a
C1396 Specification for Gypsum Board
cooled surface in contact with moist air.
D4442 Test Methods for Direct Moisture Content Measure-
ment of Wood and Wood-Base Materials
3.1.5 dielectric meters, n—meters that measure primarily by
D4444 Test Method for Laboratory Standardization and
admittance or power loss.
Calibration of Hand-Held Moisture Meters
3.1.5.1 Discussion—Dielectric meters generally do not have
pins that penetrate into the material being measured. There are
two general types of dielectric meters that may be arbitrarily
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC11onGypsum
categorized by their predominant mode of response – admit-
and Related Building Materials and Systems and is the direct responsibility of
tance (or capacitance) and power loss. Both have surface
Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
CurrenteditionapprovedJune1,2014.PublishedJuly2014.Originallyapproved
contactelectrodesandreadoutscalesthatareusuallymarkedin
in 2013. Last previous edition approved in 2013 as C1789 – 13. DOI: 10.1520/
C1789-14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from American Society of Heating, Refrigerating, and Air-
Standards volume information, refer to the standard’s Document Summary page on Conditioning Engineers, Inc. (ASHRAE), 1791 Tullie Circle, NE, Atlanta, GA
the ASTM website. 30329, http://www.ashrae.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C1789 − 14
arbitrary units. Most dielectric meters operate in the r-f 4.4 Due to the various cor
...
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: C1789 − 13 C1789 − 14
Standard Test Method for
Use and Calibration of Hand-Held Moisture Meters on
1
Gypsum Panels
This standard is issued under the fixed designation C1789; 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 applies to the calibration of handheld moisture meters for gypsum board, glass faced gypsum panels and
fiber-reinforced gypsum panels by means of electrical conductance and dielectric meters. The test uses wetted test specimens which
are dried down in at least 5 steps to determine the moisture content based on the weight loss in comparison to the dry weight. The
test also supplies the ERH values for each of the drying steps.
1.2 This test method applies to the field use of hand-held moisture meters at storage and distribution facilities, construction job
sites and in buildings.
1.2 This test method has not been evaluated for the influence of paint or wall covering materials on the indicated moisture
content of a gypsum board or panel substrate.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C473 Test Methods for Physical Testing of Gypsum Panel Products
C1177 Specification for Glass Mat Gypsum Substrate for Use as Sheathing
C1178 Specification for Coated Glass Mat Water-Resistant Gypsum Backing Panel
C1278 Specification for Fiber-Reinforced Gypsum Panel
C1396 Specification for Gypsum Board
D4442 Test Methods for Direct Moisture Content Measurement of Wood and Wood-Base Materials
D4444 Test Method for Laboratory Standardization and Calibration of Hand-Held Moisture Meters
3
2.2 ASHRAE Standard:
2009 ASHRAE Handbook – Fundamentals, Chapter 1 – Psychrometrics, American Society of Heating, Refrigerating and
Air-conditioning Engineers
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 absolute humidity, d —, n—the ratio of the mass of water vapor to the total volume of the moist air sample.
v
3.1.2 admittance—admittance, n—inverse of impedance, a measure of how easily an electric current can flow through a
material.
3.1.3 conductance meters—meters, n—conductance meters are those that measure predominantly ionic conductance between
points of applied voltage, usually dc.
1
This test method is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct responsibility of
Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Current edition approved Dec. 1, 2013June 1, 2014. Published January 2014July 2014. Originally approved in 2013. Last previous edition approved in 2013 as C1789
– 13. DOI: 10.1520/C1789-13.10.1520/C1789-14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. (ASHRAE), 1791 Tullie Circle, NE, Atlanta, GA 30329,
http://www.ashrae.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C1789 − 14
3.1.3.1 Discussion—
Conductance meters generally have pins that penetrate into the material being measured. Direct-current conductance meters are
12
commonly referred to as "resistance" meters. Most commercial conductance meters are high-input impedance (about 10 Ω),
4 12
wide-range (10 to 10 Ω) ohmmeters. Their scales are generally calibrated to read directly in moisture content (oven-dry mass
basis) for a particular calibration material and at a specific reference temperature.
3.1.4 dew-point temperature, t —, n—the temperature at which a sample of moist air being cooled at constant pressure and
d
moisture content reaches 100 percent relative humidity.
3.1.4.1 Discussion—
The dew-point temperature is the temperature at which water condensation begins to occur on a cooled surface in contac
...
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