Platinum Temperature Sensors0 pages

Platinum Temperature Sensors
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General Information
In many sectors, temperature measurement is one of the most important physically defined parameter to
determine product quality, security and reliability. Temperature sensors are produced with different
technologies to fit specific application requirements. To this end, IST has concentrated the development,
manufacturing processes and materials to produce high-end thin-film temperature sensors. This know-how,
partially derived from the semiconductor industry, allowing IST to manufacture sensors in very small
dimensions. Thin-film temperature sensors exhibit a very short response time due to their low thermal mass.
The technologies and processes of IST thin-film sensors combines the positive attributes of traditional wirewound platinum sensors - accuracy, long-term stability, repeatability and interchangeability within a wide
temperature range. The advantages of thin-film mass-production creates an optimal price/performance ratio.

Construction
The temperature sensor consists of a high-purity platinum meander, photolithographically structured on a
ceramic substrate. The resistivity is laser-trimmed and precisely adjusted to the final value. The resistive
structure is covered with a glass passivation layer protecting the sensor against mechanical and chemical
damages. The welded leadwires are covered with an additional fixation layer.

Special Features
– Fast response time
– Excellent long-term stability
– Low self-heating
– Optimal price/performance ratio

– Small dimensions
– Vibration and temperature shock resistant
– Simple interchangeability

Long-Term Stability
For all sensor types up to 7W (750°C), the change in ohmic value after 1000 hrs is less than 0.04% at
maximum operating temperatures.

Nominal Value and Temperature Coefficent
The nominal value of the sensor is the defined value of the sensor resistance at 0° C. The temperature
coefficient (TCR) is defined as
=

R100 - R0
100 · R0

-1

-1

[K ] according to the DIN IEC 751 numerical value of 0.00385 K .

Generally, the value is defined in ppm/K.
This example defines 3850ppm/K.