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YSI Precision Thermistors & Probes - advindsys.com

IntroductionThermistor ComponentsSpecial Test ServicesConfigure to Order ProbesYSI 400 and 700 Series Reusable ProbesYSI 4600 Precision ThermometersTechnical InformationYSI Precision Thermistors & ProbesThermistors at YSIYSI developed the first interchangeable thermistorprobes in 1955 and the first line of precisioninterchangeable Thermistors in 1961. In 1982, weintroduced the first Precision interchangeable glass-encapsulated Thermistors . We have improved theseproducts and expanded them into a full line ofprecision Are Thermistors ?The name is derived from the device s major charac-teristic it s a thermally sensitive resistor.

Thermistors at YSI YSI developed the first interchangeable thermistor probes in 1955 and the first line of precision interchangeable thermistors in 1961.

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Transcription of YSI Precision Thermistors & Probes - advindsys.com

1 IntroductionThermistor ComponentsSpecial Test ServicesConfigure to Order ProbesYSI 400 and 700 Series Reusable ProbesYSI 4600 Precision ThermometersTechnical InformationYSI Precision Thermistors & ProbesThermistors at YSIYSI developed the first interchangeable thermistorprobes in 1955 and the first line of precisioninterchangeable Thermistors in 1961. In 1982, weintroduced the first Precision interchangeable glass-encapsulated Thermistors . We have improved theseproducts and expanded them into a full line ofprecision Are Thermistors ?The name is derived from the device s major charac-teristic it s a thermally sensitive resistor.

2 There aretwo major types: NTC, with a negative temperaturecoefficient of resistance; and PTC, with a positivetemperature coefficient. YSI manufactures NTC ther-mistors, which exhibit a steep drop in resistance astemperature increases, providing high sensitivity totemperature changes. The resistance changes approxi-mately three orders of magnitude in a 100 C provides a means to measure very small tempera-ture variations very We Manufacture ThermistorsManufacturing Precision Thermistors involves ceram-ics technology, solid state chemistry, electronics andprecision temperature are mixed metal oxide semiconduc-tors.

3 We prepare them by intimately mixing fine pow-ders of transition metal oxides, pressing them intodisks under high pressure, and firing the disks at hightemperature. In the high-temperature firing process,called sintering, the metal oxides undergo a solid statechemical reaction, forming an electrically activematerial called a spinel. Spinels of transition metaloxides, such as nickel, manganese and iron, exhibitlarge changes in resistance with small changes sintering, we apply electrical contacts andattach leads. To protect Thermistors from environmen-tal damage, we encapsulate them in epoxy or electrical properties are controlled by compo-sition, sintering temperature and oxygen partial pres-sure.

4 The material constant beta (or slope) and theresistivity (ohm-cm) are established by the manufac-turing process. To achieve interchangeability over anextended temperature range, the material constantbeta must be tightly controlled. YSI maintains vari-ability in beta of less than resistance (ohm) is a function of the resistiv-ity and the physical dimensions of the the slope and resistivity are fixed by com-position and firing temperature, the resistance can beadjusted by varying the dimensions. YSI uses thisproperty in a patented process to manufacture preci-sion interchangeable Advantages of Thermistors Sensitivity A thermistor is much more sensitive totemperature change than other sensors.

5 A typicalthermistor changes 1,290 ohms per degree at 25 C. Interchangeability YSI Thermistors are availablewith interchangeabilities to C, not just at asingle point but over a temperature range from 0 to70 C. This is a result of precise process control andextreme attention to quality. Two-Wire Connection No reference junctioncompensation necessary as with thermocouples. Thethermistor s inherent higher resistance allows forlonger lead length without introducing significanterrors compared to platinum RTDs, which mustoperate in a 3-wire or 4-wire mode.

6 Ruggedness The NASA qualification programincludes numerous tests of ruggedness, which YSIthermistors continue to pass. NASA has deemed YSIthermistors worthy of qualification for extendedspace flight. Hermetic Seal YSI glass-encapsulated thermistorsachieve a hermetic seal between the environment andthe thermistor disk. This permits measurement insevere moisture environments without concern forsilver migration. Flexibility YSI Thermistors come in a great varietyof resistances, slope characteristics, lead configura-tions and encapsulation materials.

7 The charts thatfollow will help you determine which thermistor willperform best in your ContactElectrical ContactSpinelLeadLeadLeadYSI CapabilitiesThis catalog describes YSI Thermistors , Probes andassemblies for laboratory, medical, industrial andprocess temperature measurement, control, indicationand compensation. You may purchase YSIthermistors unmounted or as complete temperaturesensing manufactures Thermistors and thermistorprobe assemblies for use in diverse fields of tempera-ture sensing: from neonatal infant monitoring totracking the temperature of astronauts in space; frommeasurement of temperature in the ocean to main-taining critical temperature parameters of satellites.

8 From one-time use in a disposable medical probe todecades in buried telecommunications can provide you with the proper thermistorfor the job as well as help you design the appropriateprobe configuration for your critical temperatureapplications. Custom Profiles When standard Thermistors orprobes just do not meet your requirements, YSI canhelp. We have 45 years of experience helpingengineers develop temperature measurementsolutions. Put our applications engineering staff towork for internal construction of a YSI thermistor Special Testing We have a special test section forthermistors requiring extraordinary or specificverification of characteristics.

9 Our NASA qualifica-tion process includes long-term age testing, burn-in,vibration, impact, humidity, high-temperature andlow-temperature Precision temperature measurement capabili-ties extend past the millikelvin range. The constant-temperature baths we use for verifying thermistorcalibration have stabilities and accuracies better than 5 millikelvin ( C). NIST Traceability Our thermistor temperaturemeasurements are directly traceable to the NationalInstitute of Standards and Technology (NIST). Wemaintain a world-class temperature calibrationlaboratory for thermistor reference Probes andstandard platinum resistance thermometers.

10 It s theonly laboratory outside Germany with DKD(Deutscher Kalibrierdienst) accreditation from thePTB, Germany s equivalent of our NIST. SPRTs YSI also manufactures the world s workingstandard of temperature, the traditional standard plati-num resistance thermometer (SPRT).For more information,contact us at 800 747-5367 or937 427-1231 Fax 93 7 Sensor TableWe specialize in thermistor -based temperature mea-surement. The chart tells you how Thermistors com-pare with other temperature measurement accuracy and sensitivity are important, Thermistors are the best rated100 ohms to 1B, R, S, E, T, J, K100, 200, 500, 1,000 Circuitmegohms at 25 Cohms at 0 CTemperatureSensorSensitivity to 53K7 to 62 V/ and 1 A/ Cohms/ C at 25 Cohms/ohm/ CStandard Accuracy ( C) Interchangeability to C to C C to C Stability at 100 C/ month (epoxy)Depends C/year (film) C/year (glass) C/year (wire)


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