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                                       A     G R E AT E R   M E A S U R E   O F   C O N F I D E N C E




How to Select the
Right Temperature
Sensor
By: Dale Cigoy
Title: Senior Applications Engineer
Keithley Instruments, Inc.
Cleveland, OH


                                                                                                        can handle this temperature range, and
Introduction                                           interfaces. Due to the scope of this article,
                                                                                                        the type K is the most general purpose
The most widely measured physical                      such sensors will not be covered in detail.
                                                                                                        thermocouple for such applications. On
parameter is temperature. Whether                                                                       the other hand, a ceramic firing kiln can
in process industry applications or in                 Selecting a Temperature Sensor                   be many hundreds of degrees C. A type N
laboratory settings, accurate temperature              There are several considerations                 would be good for the higher temperature,
measurements are a critical part of success.           when selecting a temperature                     because of their stability and resistance
Accurate temperature measurements are                  sensor. First, consider                          to high temperature oxidation. On the
needed in medical applications, materials              the type of application. What is the             other end of the scale, superconducting
research in labs, electrical/electronic                device to be measured? Is it ambient air         devices achieve superconductivity at
component studies, biology research,                   temperature in a room or enclosure? An           very low temperatures, around several
geological studies, and electrical product             electronic component with plastic or metal       Kelvin (or just above absolute zero or
device thermal characterization.                       packaging that may or may not have high          

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