{"id":3855,"date":"2014-05-22T10:00:16","date_gmt":"2014-05-22T15:00:16","guid":{"rendered":"https:\/\/www.coleparmer.com\/blog\/?p=3855"},"modified":"2022-11-28T13:02:52","modified_gmt":"2022-11-28T19:02:52","slug":"measuring-temperature-accurately-what-are-the-costs-part-ii","status":"publish","type":"post","link":"https:\/\/www.coleparmer.com\/blog\/measuring-temperature-accurately-what-are-the-costs-part-ii\/","title":{"rendered":"Measuring Temperature Accurately: What Are the Costs? (Part II)"},"content":{"rendered":"<p><a href=\"https:\/\/www.coleparmer.com\/blog\/wp-content\/uploads\/2014\/05\/digi-sense-economical-thermometer.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-thumbnail wp-image-3852\" src=\"https:\/\/www.coleparmer.com\/blog\/wp-content\/uploads\/2014\/05\/digi-sense-economical-thermometer.gif?w=77\" alt=\"Digi-Sense-Economical-Thermometer\" width=\"77\" height=\"150\"><\/a>In part one, we covered the move from mercury-in-glass thermometers to alternatives. Below, we discuss how these alternatives perform in terms of accuracy, functionality, and limitations.<\/p>\n<p><strong>Digital and Analog Options<\/strong><\/p>\n<p><em>Digital alternatives <\/em><\/p>\n<p><strong>Thermistors or Themistor Meters and Probes<\/strong> have exceptional accuracy over ambient and biological temperature ranges, especially when compared to the next two options (RTDs and thermocouples). Outside the biological range, however, they can get damaged. They operate through a decrease in resistance as the temperature increases. This difference is converted and displayed as temperature. Thermistor probes are highly sensitive to small temperature changes and can be fragile. Their use is very limited in the industrial marketplace.<\/p>\n<p><strong>Resistance Temperature Detectors (RTDs) or Platinum Resistance Thermometers (PRTs)<\/strong> offer excellent accuracy, stability, and repeatability over a wide temperature range but are sensitive to mechanical shock. These instruments measure temperature by measuring the change in electrical resistance across a metal wire. Some sources indicate RTDs are the most accurate sensors for use in industrial applications.<\/p>\n<p><strong>Thermocouple Systems (Meters and Probes)<\/strong> use a sensor composed of two dissimilar metals for measuring temperature. This different pairing of multiple metals (such as iron or copper) makes them operable for many different applications and highly versatile. Thermocouples are durable and immune to shock and vibration, although they are less accurate than thermistors or RTDs. Because thermocouples work with a wide range of temperatures at both temperature extremes, they can take readings in applications that thermistors or RTDs cannot handle. Thermocouples are often used in furnaces, ovens, and other spaces in which temperatures tend to rise to 250\u00b0C or above.<\/p>\n<p><strong>Infrared Thermometers <\/strong>read infrared energy as emitted from an object, convert it into an electrical signal, and display it as a temperature reading. They provide a fast response time for surface temperatures and also read a wide range of temperatures. Because they are a noncontact technology, they do not contaminate objects from one reading to the next. They are an excellent choice for reading temperatures on moving, vibrating, or rotating parts, high-temperature or too-hot-to-touch objects, electrically active items, or hard-to-reach objects.<\/p>\n<p><strong>Digital Indicator Thermometers<\/strong> are used for general purposes such as monitoring the temperature of freezers, water baths, and incubators. They are also a good option for displaying ambient temperatures for food service purposes. Their accuracy varies by model but they are easy to read and may be battery operated, wireless, solar powered and\/or wall mounted.<\/p>\n<p><em>Analog options <\/em><\/p>\n<p><strong>Organic-Liquid-Filled Glass Thermometers <\/strong>contain nonhazardous liquid in a graduated scale tube which closely resembles their mercury predecessors. The accuracy of a typical glass thermometer is \u00b11 scale division. These are available in partial immersion or total immersion types and typically have to be considerably longer to achieve the same specifications as a mercury thermometer.<\/p>\n<p><strong>Bimetal Thermometers <\/strong>do not require power and are an economical option. A bimetal element moves the pointer on an analog dial as the temperature changes. They are available in standard, dampened movement, and silicone-filled types. Generally, these thermometers offer \u00b11% full-scale accuracy.<\/p>\n<p><strong><em>Check our Friday blog to continue reading part III.<\/em><\/strong><\/p>\n<p>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In part one, we covered the move from mercury-in-glass thermometers to alternatives. Below, we discuss how these alternatives perform in terms of accuracy, functionality, and limitations. Digital and Analog Options Digital alternatives Thermistors or Themistor&#8230;<\/p>\n","protected":false},"author":20,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[],"class_list":["post-3855","post","type-post","status-publish","format-standard","hentry","category-temperaturehumidity"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Measuring Temperature Accurately: What Are the Costs? 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