platinum resistance thermometer temperature range
Also, because of the shallow slope, the readout used for the resistance measurement need not have a large range. The different resistance values and different sheath materials are intended for different temperature ranges. Additionally, since these instruments are actually part of the definition of the ITS-90, they are standardized. The platinum resistance thermometer is a versatile instrument for temperature measurement in the range from - 200" to 1000°C. Standard Platinum Resistance Thermometers (SPRTs), Standard Platinum Resistance Thermometers, Automated Pressure Controller / Calibrators, Pneumatic Pressure Controllers / Calibrators, High Pressure Pneumatic Controller / Calibrators, High-Pressure Hydraulic Deadweight Testers, Mechanical / Dimensional Calibration Software, Thermocouple Voltage to Temperature Calculator, DH Instruments Pressure and Flow Calibration, Wide temperature Range (–260°C to 1000°C), Electrical resistance is typically between 0W and 400W and depends on temperature, Shallow slope (i.e. Not all designs perform to the level required for use as a reference. As PRT’s are not completely linear polynomial approximation is required. PT-100 platinum resistance thermometers (PRTs) are an excellent choice for use as cryogenic temperature sensing and control elements in the range from 30 K to 873 K (-243 °C to 600 °C). δ = constant δ lies between 1.488 to 1.498. In calibration, the electrical resistance is measured at several temperature points and fitted to a mathematical expression. How to Calibrate an RTD or Platinum Resistance Thermometer (PRT) (App Note), How to do a temperature sensor comparison calibration (Blog), Annealing a PRT: Why, When and How (Webinar), Speak with a calibration product expert about your probe and equipment needs. Platinum Resistance Thermometer Thermocouple Thermistor Sensor Platinum-wire wound or flat- film resistor Thermoelement, two dissimilar metals/alloys Ceramic (metal oxides) Accuracy (typical values) 0.1 to 1.0°C 0.5 to 5.0°C 0.1 to 1.5°C Long term Stability Excellent Variable, Prone to ageing Good Temperature range-200 to 650°C -200 to1750°C -100 to 300°C That is, there are minimum requirements for the purity of the platinum wire and the type of construction used. As mentioned, PRTs are available in many configurations, however PRTs which are suitable for use as calibration standards are generally available as 100W stainless steel sheathed probes. It is used both for precision measurements of the … This will result in inconsistent self-heating and additional calibration errors. They are the instruments specified in the International Temperature Scale of 1990 (the ITS-90) for performing measurements within the range -259.3467 °C (the triple point of hydrogen) to 961.78 °C (the freezing point of silver). ITS-90 is designed to represent the thermodynamic (absolute) temperature scale (referencing absolute zero) as closely as possible throughout its range.Many different thermometer designs are required to cover the entire range. Immersion depth is also an issue. Calibration is performed by measurement of the resistance of the unit under test (UUT) while it is exposed to a temperature. Historically, they have been limited to a temperature range of –200°C to 420°C but a new type has been introduced which has extended the upper limit to 1000°C. We must solve these problems satisfactorily to provide a proper calibration. Changing ranges can cause discontinuities in the math fit (the equations are intended to fit platinum, not DMM range offsets or gain errors). Support requests for items purchased from, or serviced directly by Fluke and general Metrology questions can be submitted via our online Support Request form and a Fluke representative will be in contact with you. The number of calibration points depends on the range and accuracy desired but, because the temperature response of platinum is relatively linear and very well known, fewer calibration points are required for a given range compared to other sensor types. RTD - or Resistance Temperature Detectors - is a temperature sensor that contain a resistor that changes resistance value as its temperature changes. Advantages: Measures high temperatures. Most certainly, these values of current are not reproduced during calibration of the reference or use of the UUT. These instruments are not as accurate as SPRTs but they are generally more rugged and easier to work with. Platinum is usually used due to its stability with temperature. This is a concern particularly with dry-wells and furnaces at temperatures above 400°C and with calibration baths that use liquid salt as the bath fluid. This is true, but actual design and construction will differ in instruments intended for different ranges. The dominant standard adopted internationally is the Pt100 which has a resistance value of 100.0 Ohms at 0°C and a change of 38.50 Ohms between 0 a nd 100°C (the fundamental interval). Many modern thermometer readouts are designed to cover this span on a single range. Platinum Resistance Thermometer Extension Cable – Silicone Rubber Insulated • Silicone rubber insulated cable for extending Platinum Resistance Thermometers • Can be used to extend up to 4 wire RTD configurations • Commonly used with Pt100Ω thermometers but suitable with other types Pt130/500/1000Ω etc. In the clinical temperature range the thermistor undergoes greater resistance change than the platinum resistance thermometer and, as with the latter, it is often used in a Wheatstone bridge circuit. Platinum is the most reliable metal due to its linear resistance to temperature relationship over a large temperature range. Over the range of –200 to 660°C, a 25W SPRT will vary in resistance from approximately 4.6W to 84.4W, a 100W PRT from approximately 18W to 338W. Standard sensors are are available from many manufacturers with various accuracy specifications and numerous packaging options to suit most applications. Additionally, some DMMs use unconventional values of source current such as decades of 2 or 3 rather than 1 (2 mA or 3 mA, not 1 mA). Common RTD sensing elements constructed of platinum, copper or nickel have a repeatable resistance versus temperature relationship (R vs T) and operating temperature range. Even an excellent instrument may not perform adequately in a specific application if it is not matched to that application. This results in less confusion as to the suitability of the instrument for a particular application and almost guaranteed good performance if calibrated and used correctly. By far the most common devices used in industry have a nominal resistance of 100 ohms at 0°C, and are called Pt100 sensors ('Pt' is the symbol for platinum). If you purchased an item from a Fluke authorized distributor, please contact them directly with questions regarding Certificates of Calibration or other documentation. Best results will be obtained with readouts designed specifically for thermometer calibration. The thermistor has the added advantage that the metal oxide bead can be made very small and that it can be manufactured more cheaply than the platinum resistance thermometer. Fundamentally, four instruments are required as follows: Since the temperature is determined by this instrument for our calibration, its accuracy and stability are of paramount importance. ĞÏࡱá > şÿ 1 3 şÿÿÿ 0 ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿì¥Á 7 ğ¿ : bjbjUU “ 7| 7| ¹ ÿÿ ÿÿ ÿÿ l ´ ´ ´ ´ L L L ` ` ,' ¶ : : : : : ½# ½# ½# Ÿ&. 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