"TE Temperature Glass Thermometers Glass Thermometers Glass thermometers are"
TE Temperature Glass Thermometers Glass Thermometers Glass thermometers are accurate, economical instruments Definitions that measure temperatures of liquids or gas. All of our glass Accuracy vs Precision. Accuracy is the difference between the thermometers conform to the International Temperature Scale measured value and the true value of a tested material. Precision of 1990 (ITS-90). All Ertco® brand thermometers have individual is the repeatability of successive measurements under the same serial numbers. ASTM thermometers vary from 5.5- to 8-mm conditions. diameter; most other thermometers have a 6- to 7-mm diameter. For PTFE-coated or tapered thermometers, call our Application ASTM (American Society for Testing and Materials). A not-for- Specialists for ordering information. profit organization that has developed standards for materials, systems, products, and services. The ASTM number refers to a Types of Glass Thermometers thermometer’s specific application. Choose your thermometer by the length that will be immersed in NIST (National Institute of Standards and Technology). the liquid or gas. U.S. government agency that provides standard l Partial Immersion Thermometers are immersed in the fluid to reference materials and calibration services. NIST- the specified immersion depth. The remaining (emergent) calibrated thermometers are calibrated at NIST. NIST-traceable portion of the stem is exposed to the air. with data thermometers are factory calibrated to NIST-calibrated standards and include a certificate with the calibration data. l Total Immersion Thermometers need to be immersed to the liquid temperature mark on the thermometer. If you are SAMA (Scientific Apparatus Makers Association). Precision glass unable to immerse properly, see “Definitions—Emergent Stem thermometers approved by ASTM subcommittee E20-05 and the Corrections” below. Since the thermometer column is fully American National Standards Institute (ANSI) as a national and immersed, these thermometers are the most accurate. international standard. Manufactured with guidance from NIST. Accuracy Emergent Stem Corrections The accuracy of a typical glass thermometer is approximately Avoid inaccurate readings when a total ±1 scale division. Precision ASTM- and SAMA-designated immersion thermometer cannot be properly thermometers are manufactured according to strict performance immersed. Determine the approximate stem correction with these formulas: Emergent specifications set by ASTM and SAMA. For accuracy ensured stem in writing, our ASTM and SAMA thermometers are available l For mercury Fahrenheit thermometers: t corrections with NIST-traceable certificates; see page 2002 for ordering °Correction = 0.00009°F x n x (T-t) information. l For mercury Celsius thermometers: Care of Glass Thermometers °Correction = 0.00016°C x n x (T-t) T Treat glass thermometers with proper care. Never tap against l For spirit-filled Fahrenheit thermometers: hard surfaces—small fractures may result, affecting accuracy. °Correction = 0.0006°F x n x (T-t) n Do not subject a glass thermometer to extreme temperature l For spirit-filled Celsius thermometers: changes—the thermometer may break or the liquid column may °Correction = 0.001°C x n x (T-t) separate. where T is the bath temperature (the Reuniting Separated Liquid Columns temperature indicated on the thermometer), t is the average temperature of the emergent Thermometer liquid columns can become separated during stem, and n is the number of emergent shipment. This means that some gas has gotten below the top of thermometer degrees. Hold an auxiliary the mercury or spirit liquid-fill. Inspect thermometers for bubbles thermometer next to emergent stem to in bulb or liquid separation before using. For more information determine t. on reunification methods, visit the technical section of the ColeParmer.com web site. Certificate of Accuracy This certificate of accuracy states that the thermometer tested meets tolerance specifications. Glass thermometers are tested at an arbitrary single point. No test data provided. Not NIST-traceable. Calibration Certificates for Catalog number EG-17006-10 Number of points One (arbitrary) Price your Glass Thermometers NIST-Traceable Certificates* Document the accuracy of your glass thermometer! NIST-traceable certificates Calibration to a NIST-Traceable standard helps meet ISO, FDA, are available with single or USDA, and EPA guidelines. Our ISO 17025-accredited metrology laboratory will pretest multiple points. The test points are and calibrate your glass thermometer. Service includes NIST-Traceable calibration measured across range of thermometer. certificate with before and after data at test point(s). Test data included. Catalog number Number of points Price InnoCal can certify glass thermometers of any length, partial- and total-immersion, EG-17006-02 Two in a range of –80 to 300°C. Each certificate includes the model number, serial number, EG-17006-03 Three test fixture, environmental conditions of laboratory, and signature of service technician. EG-17006-04 Four Select from certificate options that allow you to specify two to five different test points. EG-17006-05 Five *ISO/IEC 17025:1999 accredited calibration available with a 20% premium. 1972 l U.S. 800-323-4340 toll-free, 847-549-7600 (outside the U.S.), www.coleparmer.com Canada 800-363-5900 l India 91-22-6716-2222 l UK 0500-345-300