12" RTD Resistance Thermometer, NR-353 Pt-100 Ω with 3 wire 36" cord

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Seller Store chiller1944
(511) 100.0%,

Location: Springfield, Oregon, United States
Ships to: US,
Item: 251644112477

Condition:Used An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. See all condition definitionsopens in a new window or tab
Seller Notes:“Like new condition.”
Country/Region of Manufacture:Japan
MPN:Does Not Apply
Unbranded:Unbranded

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 12″ Resistance Thermometer, NR-353 Pt-100 Ω
with 3 wire 36″ cord


Resistance thermometers,
also called resistance temperature detectors (RTDs), are sensors used
to measure temperature by correlating the resistance of the RTD element with
temperature. Most RTD elements consist of a length of fine coiled wire wrapped
around a ceramic or glass core. The element is usually quite fragile, so it is
often placed inside a sheathed probe to protect it. The RTD element is made
from a pure material, typically platinum, nickel or copper. The material has a
predictable change in resistance as the temperature changes and it is this
predictable change that is used to determine temperature.

R vs T relationship of
various metals

Common RTD sensing
elements constructed of platinum, copper or nickel have a repeatable resistance
versus temperature relationship (R vs T) and operating temperature range. The R
vs T relationship is defined as the amount of resistance change of the sensor
per degree of temperature change. The relative change in resistance
(temperature coefficient of resistance) varies only slightly over the useful
range of the sensor.

Platinum was proposed by
Sir William Siemens as an element for resistance temperature detector at the
Bakerian lecture in 1871: it is a noble metal and has the most stable resistance-temperature
relationship over the largest temperature range. Nickel elements have a limited
temperature range because the amount of change in resistance per degree of
change in temperature becomes very non-linear at temperatures over 572 °F (300 °C).
Copper has a very linear resistance-temperature relationship, however copper
oxidizes at moderate temperatures and cannot be used over 302 °F
(150 °C).

Platinum is the best
metal for RTDs because it follows a very linear resistance-temperature
relationship and it follows the R vs T relationship in a highly repeatable
manner over a wide temperature range. The unique properties of platinum make it
the material of choice for temperature standards over the range of
-272.5 °C to 961.78 °C, and is used in the sensors that define the
International Temperature Standard, ITS-90. Platinum is chosen also because of
its chemical inertness.

The significant
characteristic of metals used as resistive elements is the linear approximation
of the resistance versus temperature relationship between 0 and 100 °C.
This temperature coefficient of resistance is called alpha, α. The equation
below defines α; its units are ohm/ohm/°C.

Pure platinum has an
alpha of 0.003925 ohm/ohm/°C in the 0 to 100 °C range and is used in the
construction of laboratory grade RTDs. Conversely two widely recognized
standards for industrial RTDs IEC 60751 and ASTM E-1137 specify an alpha of
0.00385 ohms/ohm/°C. Before these standards were widely adopted several
different alpha values were used. It is still possible to find older probes
that are made with platinum that have alpha values of 0.003916 ohms/ohm/°C and
0.003902 ohms/ohm/°C.

These different alpha
values for platinum are achieved by doping; basically carefully introducing
impurities into the platinum. The impurities introduced during doping become
embedded in the lattice structure of the platinum and result in a different R
vs. T curve and hence alpha value


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