ASTM E1061-01
(Specification)Standard Specification for Direct-Reading Liquid Crystal Forehead Thermometers
Standard Specification for Direct-Reading Liquid Crystal Forehead Thermometers
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.
1.3 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: E 1061 – 01
Standard Specification for
1
Direct-Reading Liquid Crystal Forehead Thermometers
This standard is issued under the fixed designation E 1061; 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 See 3.2.5.2 for description of T°520.
3.2.2 color play, n—the predictable sequence of colors
1.1 This specification covers direct-reading liquid crystal
exhibitedbyaliquidcrystalformulationasitpassesthroughits
forehead thermometers designed to monitor trends or measure
active temperature range. For example, as temperature in-
human forehead surface temperatures, or both.
creases, a formulation exhibits successive tan, red, green, and
1.2 Thermometers covered by this specification are gener-
blue colors.
ally available in continuous or intermittent reading modes.
3.2.3 manufacturing lot, n—(1) in the case of continuous
Thermometers meeting the requirements specified herein shall
manufacturing processes, a lot is a specifically identified
be considered as complying with this specification.
amount produced in a unit of time or quantity in a manner that
1.3 The following precautionary caveat pertains only to the
assumes its having uniform characteristics and quality within
test method portion, Section 5, of this specification. This
specified limits.
standard does not purport to address all of the safety concerns,
(2) In the case of batch processes, a lot means a batch or
if any, associated with its use. It is the responsibility of the user
specifically identified portion of a batch assumed to have
of this standard to consult and establish appropriate safety and
uniform characteristics and quality within specified limits.
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-
2. Referenced Documents
eter follow each other in an orderly predetermined manner.
3.2.5 specific color phenomena, n (using instrumental
2.1 ASTM Standards:
methods of evaluation):
E 344 Terminology Relating to Thermometry and Hydrom-
2
3.2.5.1 blue—that temperature at which the intensity of 470
etry
nm light reflected by the liquid crystal is maximum, symbol-
3. Terminology
ized as T°470.
3.2.5.2 green—that temperature at which the intensity of
3.1 Definitions—For definitions of terms used in this speci-
520 nm light reflected by the liquid crystal is maximum,
fication, refer to Terminology E 344.
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
SG 1 SB
CG 5 MG 5 5 T°520 liquid crystal first begins to reflect blue light, which is defined
2
as light having a wavelength of 491 nm.
3.2.7 start of green (SG), n—that temperature at which the
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liquid crystal first begins to reflect green light, which is defined
This specification is under the jurisdiction of ASTM Committee E20 on
Temperature Measurement and is the direct responsibility of Subcommittee E20.08
as light having a wavelength of 575 nm.
on Medical Thermometry.
3.2.8 start of red (SR), n—that temperature at which the
Current edition approved May 10, 2001. Published May 2001. Originally
liquidcrystalfirstbeginstoreflectredlight,whichisdefinedas
published as E 1061–85. Last previous edition E 1061–94(2000).
2
Annual Book of ASTM Standards, Vol 14.03. light having a wavelength of 675 nm.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E1061–01
3.2.9 thermal profile, n—temperatures at which specific labels, invoices, sales literature and the like. The following
color phenomena occur in a liquid crystal thermometer. statement is suggested when sufficient space is available:“This
3.2.10 visible start (VS), n—that temperature at which the thermometer conforms to all of the requirements established in
liquid crystal first begins to reflect visible light. this specification. Full responsibility for the conformance of
this product to the specification is assumed by (name and
4. Requirements
address of producer or distributor).”The following abbreviated
4.1 General—Thermometersrepresentedascomplyingwith statement is suggested when available space is insufficient
...
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