Platinum (Pt) resistance elements are temperature sensors based upon the property that the electrical resistance of platinum (Pt) increases with a rise in temperature. Generally, Pt elements are not designed for use in their discrete element form. Some type of housing or assembly is usually required to provide protection from the environment.
Heraeus Nexensos supplies three basic types of platinum (Pt) resistance elements:
Thin Film Platinum (Pt) Elements are constructed by depositing a sensing layer of platinum on a ceramic substrate. Thin Film Elements offer the advantages of small size and a wide choice of resistance values ranging from 1 to 10.000 ohms. Thin Film Elements are available in both leaded and SMD versions.
Standard and customer-specific designs are available for a variety of applications .
Several factors need to be considered when using Platinum Resistance Elements in assemblies.
Values for response times in water and air are stated in the tables on each product data sheet. Thin Film Platinum (Pt) Resistance Elements have exceptionally short response times.
Like all resistive elements through which a current flows, Platinum (Pt) Resistance Elements are slightly heated by the current. The magnitude of this "self-heating error" is dependent upon on the electrical energy input (N=I2 x R), the volume of heat being dissipated, and a component constant. The self-heating constant for each resistance element when used in water or air is shown in the tables on each product page
Standard types of elements are available in stock and at competitive prices.
For special applications, non-standard versions are available with the following options:
