ASTM E1061-01(2007)
(Specification)Standard Specification for Direct-Reading Liquid Crystal Forehead Thermometers
Standard Specification for Direct-Reading Liquid Crystal Forehead Thermometers
ABSTRACT
This specification covers the requirements and test methods for direct-reading liquid crystal forehead thermometers, in either the continuous or intermittent reading modes, designed to monitor trends or measure human forehead surface temperatures, or both. When examined by test methods recommended herein, each thermometer shall comply with thermal profile, temperature range, tolerance, sequencing, operating and storage environment, and labeling requirements.
SCOPE
1.1 This specification covers direct-reading liquid crystal forehead thermometers designed to monitor trends or measure human forehead surface temperatures, or both.
1.2 Thermometers covered by this specification are generally available in continuous or intermittent reading modes. Thermometers meeting the requirements specified herein shall be considered as complying with this specification.
The following precautionary caveat pertains only to the test method portion, Section 5, of this specification. 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 consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E1061 −01(Reapproved 2007)
Standard Specification for
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Direct-Reading Liquid Crystal Forehead Thermometers
This standard is issued under the fixed designation E1061; 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 3.2.2 color play, n—the predictable sequence of colors
exhibitedbyaliquidcrystalformulationasitpassesthroughits
1.1 This specification covers direct-reading liquid crystal
active temperature range. For example, as temperature
forehead thermometers designed to monitor trends or measure
increases,aformulationexhibitssuccessivetan,red,green,and
human forehead surface temperatures, or both.
blue colors.
1.2 Thermometers covered by this specification are gener-
3.2.3 manufacturing lot, n—(1) in the case of continuous
ally available in continuous or intermittent reading modes.
manufacturing processes, a lot is a specifically identified
Thermometers meeting the requirements specified herein shall
amount produced in a unit of time or quantity in a manner that
be considered as complying with this specification.
assumes its having uniform characteristics and quality within
1.3 The following precautionary caveat pertains only to the
specified limits.
test method portion, Section 5, of this specification. This
(2) In the case of batch processes, a lot means a batch or
standard does not purport to address all of the safety concerns,
specifically identified portion of a batch assumed to have
if any, associated with its use. It is the responsibility of the user
uniform characteristics and quality within specified limits.
of this standard to consult and establish appropriate safety and
health practices and determine the applicability of regulatory
3.2.4 sequencing, n—a characteristic whereby the thermal
limitations prior to use.
profiles of the liquid crystal formulations of a given thermom-
eter follow each other in an orderly predetermined manner.
2. Referenced Documents
3.2.5 specific color phenomena, n (using instrumental meth-
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2.1 ASTM Standards:
ods of evaluation):
E344 Terminology Relating to Thermometry and Hydrom-
3.2.5.1 blue—that temperature at which the intensity of 470
etry
nm light reflected by the liquid crystal is maximum, symbol-
ized as T°470.
3. Terminology
3.2.5.2 green—that temperature at which the intensity of
3.1 Definitions—For definitions of terms used in this
520 nm light reflected by the liquid crystal is maximum,
specification, refer to Terminology E344.
symbolized as T°520.
3.2 Definitions of Terms Specific to This Standard:
3.2.5.3 red—that temperature at which the intensity of 650
3.2.1 center green (CG) or mid green (MG), n—that tem-
nm light reflected by the liquid crystal is maximum, symbol-
perature which unifies the visual and instrumental evaluation
ized as T°650.
methods and is defined by the equation:
3.2.6 start of blue (SB), n—that temperature at which the
SG1SB
liquid crystal first begins to reflect blue light, which is defined
CG 5 MG 5 5 T°520
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as light having a wavelength of 491 nm.
See 3.2.5.2 for description of T°520.
3.2.7 start of green (SG), n—that temperature at which the
liquid crystal first begins to reflect green light, which is defined
as light having a wavelength of 575 nm.
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This specification is under the jurisdiction of ASTM Committee F04 on
3.2.8 start of red (SR), n—that temperature at which the
Medical and Surgical Materials and Devices and is the direct responsibility of
liquidcrystalfirstbeginstoreflectredlight,whichisdefinedas
Subcommittee F04.33 on Medical/Surgical Instruments.
light having a wavelength of 675 nm.
Current edition approved May 1, 2007. Published June 2007. Originally
approved in 1985. Last previous edition approved in 2001 as E1061 – 01. DOI:
3.2.9 thermal profile, n—temperatures at which specific
10.1520/E1061-01R07.
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color phenomena occur in a liquid crystal thermometer.
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
3.2.10 visible start (VS), n—that temperature at which the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. liquid crystal first begins to reflect visible light.
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E1061 − 01 (2007)
4. Requirements statement is suggested when sufficient space is available: “This
thermometer conforms to all of the requirements established in
4.1 General—Thermometers represented as complying with
this specification. Full re
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