Measuring insert for temperature measurement

US9074945B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER WETZER GMBH+CO. KG · DE

Inventors

• Wilfried Meissner · Pfronten, DE
• Helmut Kalteis · Marktoberdorf, DE
• Peter Seefeld · Bad Wimpfen, DE

Key dates

• Filing date: Nov 9, 2010
• Grant date: Jul 7, 2015
• Expiry date: Oct 6, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01K1/10
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

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.