STANDARDS FOR TEMPERATURE
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There are numerous standards around the world and
the goal of this part of the site is to eventually catalog most, if not all, of
them. This is a start with links to many of the organizations involved, if they
are on the Web. The ones we know the best are those published by
ASTM and those standards that deal with radiation thermometers. We shall be
searching the Web and the Net for more details. If you can add to this page, just
email your information and we will include
it as we are able to verify and edit the page.
- Temperature Scales
Temperature Scale of 1990 (ITS-90) is the de facto standard used in the industrialized
world by international convention. This page gives a bit more explanation of this
plus previous scales and their relationships to each other.
Standards Related to Temperature and Calibration in General
special calibration apparatus and related issues.
Related to Clinical Thermometers
The standards for clinical thermometers
are scattered around, at least within the ASTM Temperature Committee, because
the committee is organized around sensor device types and not around sensor uses.
- Standards Related to Thermocouples
The ASTM Standard E 230 for emf vs. temperature is an American National Standard
for thermocouples. But there are many more standards for thermocouples, in fact
a large group just among the ASTM standards. If you seek copies of the thermocouple
tables or information on them visit our thermocouple tables
- Standards Related to Resistance
Resistance Temperature Detectors, also known
as RTDs, PRTs (Platimum Resistance Thermometers) and SPRTs (Standard Platimum
Resistance Thermometers) come in more than Platinum, as you will know if you have
been to the RTDs page on this site.
Related to Radiation Thermometers and Thermal Imagers
Optical Pyrometers and Thermal Imagers all are based on the same physical phenomena
of nature but have different standards associated with them. Most of the Thermal
Imager standards have little to do with temperature measurement (they are mostly
about imaging properties) but that situation appears to be due for some changes
- Standards Related to Thermistors
Most of the Thermistor standards are related to clinical uses of thermistor-based
thermometers to measure human temperatures.
Related to Liquid-In-Glass Thermometers
Liquid-in Glass thermometers
are undergoing some serious changes as the"War on Mercury" heats up (pun intended).
But seriously there are many standards for "Glass Thermometers" that are based
on the properties of them where mercury is the liquid in the capillary. It will
be some time before all the standards are rewritten, but non-mercury devices are
on the market already from more than one company. Suffice it to say, it appears
that there are quite a few tradition-bound standards that cannot accept that more
accurate and cost effective temperature measurement devices are already on the
market, e.g. RTDs and Thermistors, that have already surpassed fragile glass thermometers.
Just witness what is available in your local Pharmacy (Chemist) at very competitive
prices for use in taking fever temperatures.
Related to Phase-Change and Liquid Crystal Thermometers
Related to Electronic Thermometers and Other Devices
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