ENDRESS+HAUSER  TST90-1U1S31S2E

Resistance thermometer and insert for thermal energy measurement

High-precision measurement of temperature differences with matched sensor pairs

The Liquiport 2010 CSP44 is a portable sampler designed for the fully automated sampling and defined distribution of liquid media.

• Universally usable for thermal energy measurements
• Measuring range: –200 to 600 °C (–328 to 1 112 °F)
• Sensors in matched pairs within the range:
  0 to 120 °C (±0.05 K)
  –40 to 0 °C (±0.1 K)
• Protection class: up to IP68

• Fast replaceability of the insert
• High degree of insert compatibility and design as per DIN 43772
• Fast response time with reduced tip

These resistance thermometers use a Pt100 temperature sensor according to IEC 60751. The temperature sensor is a temperature-sensitive platinum resistor with a resistance of 100 Ω at 0 °C (32 °F) and a temperature coefficient α = 0.003851 °C -1 .

There are generally two different kinds of platinum resistance thermometers:

Wire wound (WW): Here, a double coil of fine, high-purity platinum wire is located in a ceramic support. This is then sealed top and bottom with a ceramic protective layer. Such resistance thermometers not only facilitate very reproducible measurements but also offer good long-term stability of the resistance/temperature characteristic within temperature ranges up to 600 °C (1 112 °F). This type of sensor is relatively large in size and it is comparatively sensitive to vibrations.

Thin film platinum resistance thermometers (TF): A very thin, ultrapure platinum layer, approx. 1 μm thick, is vaporized in a vacuum on a ceramic substrate and then structured photolithographically. The platinum conductor paths formed in this way create the measuring resistance. Additional covering and passivation layers are applied and reliably protect the thin platinum layer from contamination and oxidation, even at high temperatures.

The primary advantages of thin film temperature sensors over wire wound versions are their smaller sizes and better vibration resistance. A relatively low principle-based deviation of the resistance/ temperature characteristic from the standard characteristic of IEC 60751 can frequently be observed among TF sensors at high temperatures. As a result, the tight limit values of tolerance category A as per IEC 60751 can only be observed with TF sensors at temperatures up to approx. 300 °C (572 °F). For this reason, thin-film sensors are generally only used for temperature measurements in ranges below 400 °C (932 °F).