Measuring insert for temperature measurement

摘要

A temperature measuring insert composed of ceramic or sintered materials of magnesium oxide or aluminum oxide accomodates, on its end facing the measured medium, temperature sensor elements, such as thermocouples and temperature measuring resistors, as a measuring tip, installable singly or with others in metal or ceramic protective tubes. The site of the measuring tip, a water adsorption behavior differing from the remaining measuring insert material is present, in order to protect the temperature sensor elements in the case of rapid process related temperature changes, in order to prevent, in the case of heating, effects due to superheated steam. A solution is provided by features including that the measuring insert has a jacketing comprising densified desiccant coatings, which have a gradient with a continuously or stepwise adapted water adsorptive behavior in the direction of the temperature sensor element, wherein, for example, a decreasing water adsorption is realized according to the invention by means of different fractions of modified and unmodified adsorbents as well as hydrophobic, super hydrophobic or hydrophobized ceramic parts.

主权项

1. A measuring insert for a thermometer having a protective jacket, said measuring insert comprising:
a temperature sensor, which serves for registering the temperature of a measured measuring material and which is at least partially embedded in the measuring insert, wherein: the measuring insert has functionalized surface areas adjoining one another, wherein: adsorptive behaviors of a liquid on said functionalized surface areas differ from one another; wherein the measuring insert has a measuring tip, which is in thermal contact with the measuring material during measurement operation; and wherein said measuring tip has a functionalized surface area, which, in comparison with at least one other surface area of the measuring insert, has the lowest affinity as regards the adsorption of liquid.