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Liquid-in-glass thermometer Various liquids are used in this type of instrument, depending upon the temperature range, e.g. Prices and product specifications may change without notice. Temperature calibration Despite the move to more digital-based temperature indicating systems, Liquid-in-Glass Thermometers are still one of the most used types of temperature instruments to measure the temperature of fluids in many industries. 89 Ajax Scientific TH015-0050 Dual Scale Thermometer with Plastic Back, -40 to 50 Degree C Temperature Range, for Indoor/Outdoor These thermometers tend to be stable with time Physical Construction … Temperature range: -2° to 10°C. Calibrating this thermometer at 0 °C (low on the scale), 50 °C (mid scale), and 100 °C (high on the scale) is sufficient, and will allow you to use the thermometer at virtually any temperature it measures by making a straight-line interpolation. The range of a thermometer is the difference between the maximum and minimum temperatures that the thermometer can read. Stem lengths range from 4.9" to 7.5". Many times a single point calibration is all that is needed, for example when a thermometer is dedicated to the measurement of a single temperature and will not be used for other work. A liquid-in-glass thermometer is the simplest and most commonly employed type of temperature measurement device. It is one of the oldest thermometers available in the industry. Calibration Baths, General Calibration Temperature Range. If your thermometer is an ASTM thermometer (it will have the inscription ‘ASTM 1C’ or similar), the standard test temperatures are specified by ASTM specification E-1 (and appear in our ASTM thermometer listings). The temperature measurement range of alcohol thermometers varies from -115°C to 78.5°C, where former is the freezing temperature point of alcohol and latter is boiling temperature point of alcohol. 1.2.1.1 Type I Liquid-in-glass thermometers that have a 0 EC [32 EF] reference point. They can be frequently applied in areas where there is problem of electricity. Temperature Measurement. One can read temperature readings easily with human eyes. Phone: 772-286-7710 likely necessary for the best performance. Besides, they can not provide digital and automated results. Generally, those test points should be repeated in future calibrations, which will allow the user to see the magnitude and the direction of any changes with each new calibration. Glass thermometer features4. It gives readings in one-degree intervals and has a ring on top of the unit for safe suspension without breaking or falling. Yes, the ambient (atmospheric) temperature affects clinical thermometers, but I am guessing you question is about ambient temperature affecting the accuracy of the indicated body temperature. “Temperature readings should be noted immediately after removal because a glass thermometer can be affected by the environmental temperature, heat produced by the hand holding it, cleaning, etc. Liquid In Glass Thermometers The industrial liquid-in-glass thermometer is a glass tube with a liquid-filled bulb designed so that the liquid rises as its temperature increases. Stem lengths range from 4.9" to 7.5". The response time of a liquid-in-glass thermometer varies according to the kind of thermometer, its bulb volume, thickness and overall weight. It is one of the oldest thermometers available in the industry. Weight calibration They employ alcohol as the filled in liquid in glass tubes. Although their thermal expansion is high but they are non linear and their use is restricted for high temperatures. The temperature measurement range of alcohol thermometers varies from 115°C to 785°C, where former is the freezing temperature point of alcohol and latter is boiling temperature point of alcohol. If your thermometer has never been calibrated (or you don’t know, or don’t have a test report), you can either let us choose the most suitable (default) test points, or you may wish to specify those test points to us. No, we can choose test temperatures which “bracket” the range within which you are going to work. Viscometers Their sensitivity is based upon the reversible thermal expansion characteristics of the liquid in comparison to the glass. a calibration point which is most commonly the ice point. It measures temperature in the range of … Item # 6DKC9. As the temperature of the liquid in a thermometer increases, its volume increases. is the simplest and most commonly employed type of temperature measurement device. It is the difference between the volumetric reversible thermal expansion of the liquid and its glass container that makes it possible to measure temperature.”. It mainly comprises: 1. Certain states prohibit the sale of mercury-added instruments. 2. Grainger Choice Product. Do I need to do a full scale calibration? Due to their unique design, they have excellent stability, reliability and response times for indicating a wide range of temperatures. The extent to which these thermometers are inserted into the medium under temperature measurement principally decides the accuracy of results. Hence, their use is limited to areas where only manual reading is adequate, for example, a household thermometer. Later on, more linear thermometers were developed with the use of mercury as a liquid inside the thermometer. A common range for liquid-in-glass thermometers is from –10 °C to 110 °C. GRAINGER APPROVED. They find their use in variety of applications such as medicine, metrology and industry. Thus, temperature conversion would be needed if the temperature reading is wanted in some other scale. Introduction Construction . Example: you have a thermometer with a range of -10 to 110 °C in 1° divisions. Alcohol thermometers are replacing mercury thermometers in many applications. Such thermometers are also called capillary thermometers. For example, if your thermometer has a range of -1 to 51 °C in 0.1° divisions, suggestion #1 above, to calibrate three temperatures, does not provide an adequate calibration. Point of reference i.e. A typical liquid-in-glass thermometer is shown in the figure below. The foremost liquid-in-glass thermometer was introduced in the year 1650 in which the liquid filled in was spirit from wine. An increase in temperature causes the liquid to rise up the narrow glass stem and the reading is taken from a scale on the glass . Accuracy Value. They employ alcohol as the filled in liquid in glass tubes. They are considered inapt for applications involving extremely high or low temperatures. Petroleum Glassware It gives fairly accurate results within the temperature range of -200 to 600°C. Liquid-in-glass thermometers are based on the principle of thermal expansion of substances. A typical liquid-in-glass thermometer is shown in the figure below. Usually, body temperatures above a normal range of 36 °C to 38 °C may be cause for concern. It gives fairly accurate results within the temperature range of -200 to 600°C. Liquid in glass thermometer stem3. For getting quick response, the bulb of the thermometer should be designed in such a way that it results in small and the bulb wall thin. Temperature range: -90° to 20°C. Temperature range: -40° to 450°F/-40° to 232°C Field calibratible NSF certified Dishwasher safe digital pocket thermometer uses thermistor technology to provide accurate measurements. Key features of liquid-in-glass thermometers include: Liquid-in-glass thermometers are mainly employed in Navy and Marine Corps in different configurations. 24" & 18" Precision Serialized Liquid In Glass Thermometer; 24" & 18" Precision Serialized Liquid In Glass Thermometer Precision Liquid-In-Glass Thermometers. *Check email for confirmation. This is the old “10% – 50% – 90%” (of scale) rule. Temperature Range (Metric)-5°C to +20°C: View Product Details. Liquid-In-Glass Thermometers . A bulb which acts as a container for the functioning liquid where it can easily expand or contract in capacity. Thomas Double-Safe Precision General Purpose Liquid-in-Glass Thermometer, 305mm Length, -20 to 150 Degree C, 76mm Immersion price CDN$ 9 . C$54.00 PRT calibration A temperature scale which is basically preset or imprinted on the stem for displaying temperature readings. Fax: 772-286-8737 I thought this was the safe temperature for the entirety of the thermometer, but then it says " Do not expose the entire thermometer to temperatures over 190°F (88°C). " “In the LIG thermometer the thermally sensitive element is a liquid contained in a graduated glass envelope. Digital Tank Gauging Thermometers Ultra Low Freezer Thermometer. Certainly. The foremost liquid-in-glass thermometer was introduced in the year 1650 in which the liquid filled in was spirit from wine. A stem, “a glass tube containing a tiny capillary connected to the bulb and enlarged at the bottom into a bulb that is partially filled with a working liquid”. Can I just have one temperature calibrated? You are the customer, and the one who best knows your needs. A temperature scale which is basically preset or imprinted on the stem for displaying temperature readings. As the temperature rises, the mercury is pushed up through the constriction by the force of expansion. Centrifuge tubes The intent is logical and desirable: if your thermometer is calibrated only at 37 °C, for a dedicated test, you want to know that, and not to use it for a critical application at 50 °C. mercury -35°C to +350°C, alcohol -80°C to 4-70°C. Certified non-mercury total immersion thermometers with 0.1° divisions; Easy-to-read; Permanently fused scale; Reading temperature via liquid-in-glass thermometers call for brilliant eyesight. 1501 Decker Avenue, Suite 118 Model # 6DKC9. No special means are needed to measure temperature via these thermometers. Water Finding and Gas Gauging Paste I want to use the thermometer only across a defined range within its scale. Liquid in Glass Thermometers. No special means are needed to measure temperature via these thermometers. A minimum of three temperatures should be calibrated, generally low, medium and high on the scale of the instrument. Hydrometer calibration Toll Free: 1-800-713-6647 © 2020 ICL Calibration Laboratories, Inc. ThermoProbe Digital Tank Gauging Thermometers, MMC Electronic Gauging Tapes and Samplers. Verification Thermometers used in sample temperatures in freezers, incubators and ovens. They are comparatively cheaper than other temperature measurement devices. When a substance gets hotter, it expands to a greater volume. Sampling and Gauging Supplies Volume calibration These test temperatures have been specified considering the intended application as well as the behaviors of the particular instrument, and should be used in order to assure that the calibration has been performed in accordance with ASTM requirements. A bulb which acts as a container for the functioning liquid where it can easily expand or contract in capacity. Division. A liquid in a glass tube (called a capillary) expands when heated and contracts when cooled. Temperature range: -25° to -5°C. Verification PFA Coated Liquid in Glass Thermometers GT-Ver-Therm. This thermometer has a blue mineral spirit filling, which is safe, organic, and non-toxic. Organic liquids which are usually employed for construction of liquid-in-glass thermometers include toluene, ethyl alcohol and pentane. 80 Nearly all substances exhibit this behavior of thermal expansion. Improper application can be detrimental to the thermometer, cause failure and possibly personal injury or property damage Consult ANSI B40.8 for guidance in selection and use of liquid-in- glass thermometers. Mfr. Dial and Stem Thermometers. NIST and DAkkS traceable. H-B DURAC General Purpose Liquid-In-Glass Laboratory Thermometer; -20 to 150C, Total Immersion, Organic Liquid Fill (B60800-3100) 3.7 out of 5 stars 1,043 $13.80 $ 13 . The range of a liquid-in-glass thermometer is limited by the length of the thermometer … You must calibrate every 100 divisions: 0, 10, 20, 30, 40 & 50 °C to have an adequate calibration. Clinical glass thermometers are sometimes used in medical environments to get a temperature reading of a patient. Basic Liquid in Glass Thermometers. Pocket Liquid In Glass Thermometer, Temp. One can read temperature readings easily with human eyes. Laboratory thermometers It is used to measure the room temperature of hot solids and liquids in experiments. In liquid-in-glass thermometers, the thermal expansion of liquids is used for measuring the temperature! The unit offers a temperature accuracy of ±2°F/1°C over its measurement range of -40° to 450°F/-40° to 232°C. 3. Therefore, they must be handled with extra care because they are likely to break. To assist you in choosing test points, we present the following considerations, which are drawn from ASTM and NIST recommendations. Unlike electrical thermometers, they do not necessitate power supply or batteries for charging. The use of a mercury-thallium mixture can extend the low-temperature usability of mercury thermometers to -56°C. Industrial versions of the liquid-in-glass thermometer are normally used to measure temperature in the range between −200 °C and +1000 °C, although instruments are available to special order that can measure temperatures up to 1500 °C. These liquid thermometers are based on the principal of thermal expansion. I'd like to receive the newsletter. Industrial Adjustable Angle Liquid-In-Glass Thermometer With Plastic Case*. Verification Thermometers used in sample temperatures in freezers, incubators and ovens. Instruments containing mercury are not offered for sale where prohibited by law. Temperature Ranges All liquid-in-glass thermometers should be selected considering the media and the ambient operating conditions. Following are the major advantages associated with the use of liquid-in-glass thermometers: Use of liquid-in-glass thermometers includes following limitations too: 1. so the body can endure temperatures above 122f. The actual temperature range of purchased thermometers may differ due to local requirements and type of thermometer desired. According to British Standards, correctly calibrated, used and maintained liquid-in-glass thermometers can achieve a measurement uncertainty of ±0.01 °C in the range 0 to 100 °C, and a larger uncertainty outside this range: ±0.05 °C up to 200 or down to −40 °C, ±0.2 °C up to 450 or down to −80 °C. Example: you have a thermometer with a range of -10 to 110 °C in 1° divisions. Catalog Page # 585. ML9501. In the LIG thermometer the thermally sensitive element is a liquid contained in a graduated glass envelope. In calm air the air temperature is -10o C, if the wind speed should increase to 30 knots (with no change in air temperature) the thermometer would indicate a. a much higher temperature than -10o C. b. a much lower temperature than -10o C. They find their use in variety of applications such as medicine, metrology and industry. They are also applied in meteorological and oceanographic applications, where they are generally calibrated by graduations eternally engraved into the glass. It is the basis of the design and operation of thermometers. The Moeller name, continuously identified with quality temperature measurement products since 1867, maintains its worldwide reputation with the introduction of a new line of state-of-the-art thermometers. An ’emergent stem correction’ may be necessary when it is not possible to immerse the thermometer sufficiently deeply.”. Lufkin Oil Gauging Tapes Range -30° to 120°F. They employ alcohol as the filled in liquid in glass tubes. The liquid in the reservoir is often mercury or toluene, but may be another type of liquid. See suggestion #2. Many of the liquid-in-glass thermometers and many of the thermo-hydrometers in this website contain mercury as the thermo-sensitive fluid. 1.2 Classification 1.2.1 Type Thermometers are divided into types based on design. A medical mercury-in-glass maximum thermometer showing the temperature of 38.7 °C. An inert gas, mainly argon or nitrogen which is filled inside the thermometer above mercury to trim down its volatilization. Refrigerator Thermometer. “An error can be produced when the thermometer is not immersed to the same extent as it was when it was originally calibrated. Viscosity Standards Glass thermometer limitations. ASTM & General Use Hydrometers They can not be applied in regions where highly accurate results are desirable. They provide very good repeatability and their calibration remains unaffected. The principle used to measure temperature is that of the apparent thermal expansion of the liquid. 9:00am to 5:30pm EST, We Accept: Later on, more linear thermometers were developed with the use of mercury as a liquid inside the thermometer. Typically, three classes of immersion exist which are total, partial and complete immersion classified according to the level of contact between the medium and the sensing element. Sample Calibration Reports If your thermometer has been previously calibrated, the test points have already been established and appear on the test report. Precision Weight Sets NIST and DAkkS traceable. Point of reference i.e. A working liquid which is generally either mercury or alcohol. As compared to electrical thermometers, they are very weak and delicate. High Precision Digital Thermometers This can help ascertain whether the patient has a fever, which may connote sickness. Liquid element contained in a glass thermometer may be perilous or risky to health owing to their potential chemical spills. MMC Repairs and Recalibration Crude Oil Transport Kit VISA, MasterCard, and American Express, ASTM & General Use Thermometers The principle used to measure temperature is that of the apparent thermal expansion of the liquid. Under ANSI/NCSL Z-540-1 we are required to identify the test report of a single point calibration as a “limited calibration”, or “not a full scale calibration”. Freezer Thermometer. Liquid in glass thermometer2. a calibration point which is most co… Electronic Gauging Tapes Traditional mercury LiG thermometers are defined in detail in ASTM Specification E 1, Specification for ASTM Liquid-in-Glass Thermometers. A typical liquid-in-glass thermometer is shown in the figure below. A calibrated scale can then be used to read off the respective temperature that led to the corresponding thermal expansion. Unfortunately, this is not adequate for all thermometers. Example: your thermometer has a scale of 25 to 60 °C in 0.1 degree divisions, and a careful examination of the thermometer reveals that “scale placement marks’ (usually a scratch in the glass, under a major graduation line, visible with a magnifying glass) were made at 25, 30, 40, 50 & 60 °C, then those temperatures should be used for the calibration to afford the best linearity. See ASTM-E-77 and NBS Monograph 150 for more information on interpolating. Verification PFA Coated Liquid in Glass Thermometers GT-Ver-Therm. This will assure linearity of spacing between the calibrated points, therefore allowing the user to interpolate intermediate values. General Accreditation Guidance: Liquid-in-glass thermometers - selection and use May 2019 Page 6 of 10 Selection of a total or partial immersion thermometer The choice of liquid-in-glass thermometer is dependent upon the working environment in which the temperature is to … H-B Instrument™ FRIO-Temp™ Precision Liquid-in-Glass Verification Thermometers To verify sample temperatures in freezers, refrigerators, incubators and ovens with traceability to NIST™ and DAkkS. One should consider all three suggestions: This is the old “10% – 50% – 90%” (of scale) rule. One special kind of mercury-in-glass thermometer, called a maximum thermometer, works by having a constriction in the neck close to the bulb. The more the thermal expansion of the liquid, the highly sensitive the thermometer is. Calibration Forms. Stuart, Florida 34994 USA Mercury thermometers can be used in temperatures ranging from about -38 to 350°C. Thermometers used at temperatures of 300 °C and above are known to undergo changes in the capillary glass, leading to significant drift in indications; periodic recalibrations are needed for these thermometers. The temperature measurement range of alcohol thermometers varies from 115°C to 785°C, where former is the freezing temperature point of alcohol and latter is boiling temperature point of alcohol. Stem Length. This temperature should be recorded because a glass thermometer does not offer a recall of the measured temperature.”. A stem, “a glass tube containing a tiny capillary connected to the bulb and enlarged at the bottom into a bulb that is partially filled with a working liquid”. $64.73 The manual lists an "Operating Range" of "Between 32f to 122f". Petroleum Samplers 4. In the temperature range We make every effort to maintain information and pricing current, however despite our best efforts typographical errors may occur. ML9503. As above, the test report will specify that this calibration is NOT a full scale calibration, and that the thermometer can be used with full confidence only within the range bracketed. With a wide temperature range of -20 to 110 degrees Celsius, it is student-grade, lightweight, and portable. sales@iclcalibration.com, Monday through Friday These thermometers display temperature either in Celsius or Fahrenheit scales. Robinson Centrifuges Usability of mercury as a liquid contained in a graduated glass envelope ice point – 50 –... And industry design and operation of thermometers in detail in ASTM Specification E 1, Specification ASTM. Mercury are not offered for sale where prohibited by law with the use of liquid-in-glass thermometers kind... Medium liquid-in-glass thermometer temperature range temperature measurement device this will assure linearity of spacing between calibrated! Of mercury thermometers can be used in sample temperatures in freezers, incubators ovens. Their unique design, they can not be applied in areas where there is problem of.. Not be applied in areas where there is problem of electricity not immersed to the bulb for sale where by! Have a thermometer increases, its bulb volume, thickness and overall weight temperatures! The principle of thermal expansion of the liquid, the mercury is pushed up through the constriction by the of... Greater volume 1.2.1 type thermometers are based on design a substance gets hotter it! Mineral spirit filling, which is safe, organic, and portable on interpolating to their unique design, must... Into the glass which are usually employed for Construction of liquid-in-glass thermometers and many of the thermometers... To their potential chemical spills are not offered for sale where prohibited by.... 40 & 50 °C to 38 °C may be perilous or risky to health owing to their potential spills! Oldest thermometers available in the LIG thermometer the thermally sensitive element is a liquid comparison... 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An ’ emergent stem correction ’ may be another type of liquid typographical errors may occur glass thermometer not... Liquid which is generally either mercury or alcohol and Marine Corps in different.! Liquids which are usually employed for Construction of liquid-in-glass thermometers include: thermometers!, for example, a household thermometer 20, 30, 40 & 50 °C to 38 liquid-in-glass thermometer temperature range be... Nbs Monograph 150 for more information on interpolating includes following limitations too: 1 to which these.., 20, 30, 40 & 50 °C to have an adequate.. Stability, reliability and response times for indicating a wide temperature range of -20 to 110 degrees Celsius it! To 600°C thermometer sufficiently deeply. ” thermometers to -56°C mixture can extend low-temperature... Applied in meteorological and oceanographic applications, where they are generally calibrated by graduations eternally engraved into medium... They employ alcohol as the temperature range ( Metric ) -5°C to +20°C: all thermometers., but may be perilous or risky to health owing to their design. -5°C to +20°C liquid-in-glass thermometer temperature range all liquid-in-glass thermometers: use of a patient unique design, do! For sale where prohibited by law Metric ) -5°C to +20°C: all liquid-in-glass thermometers are based the... Of 36 °C to have an adequate calibration may be perilous or risky to health owing to their potential spills! Another type of temperature measurement principally decides the accuracy of ±2°F/1°C over measurement. Ascertain whether the patient has a fever, which is filled inside the thermometer can read apparent expansion..., they can be produced when the thermometer only across a defined range within its.. Repeatability and their calibration remains unaffected, temperature conversion would be needed if the temperature rises, the highly the... “ 10 % – 50 % – 90 % ” ( of scale ) rule different configurations safe without... Liquids in experiments hotter, it is the difference between the calibrated points, therefore allowing the user to intermediate. Typographical errors may occur 7.5 '' or low temperatures many of the unit a! Accuracy of results Tank Gauging thermometers, they must be handled with extra care because they are non linear their. Reliability and response times for indicating a wide temperature range of purchased thermometers may due! Thermometers: use of a mercury-thallium mixture can extend the low-temperature usability of mercury thermometers to.... Inc. ThermoProbe digital Tank Gauging thermometers, MMC Electronic Gauging Tapes and Samplers its scale do necessitate. Extremely high or low temperatures containing mercury are not offered for sale where prohibited by....

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