Resistance thermometers with tapered tip are intended for measuring temperature of liquid and gaseous media, at low and medium pressures, primarily in inaccessible and complicated containers and pipelines.

Resistance thermometer is mounted directly in the medium in which the temperature is measured with or without process connection.

Basic parts of thermoelement are as follows:
-connection head – rotating,
-external protection tube with tapered tip,
-measuring insert,
-process connection.

Connection head (rotating) of thermoelement is defined via the configurator.

External protection tube, flat part tapered tip are made of material W.Nr. 1.4404, (equivalent to W.Nr. 1.4571). Tapered tip is made of solid material.

Measuring insert in mantel design with different types of resistance sensor (Pt 100, Pt 500, Pt 1000, Ni 100, Ni 120, Ni 500,) which are defined via the configurator.

Process structure is achieved by means of connections of different shapes and dimensions.

Advantages of structure with tapered tip of protection tube

Fast response:
Measuring insert is inserted into tapered tip to allow for very fast response without weakening the structure. (Response time is a square function of the measuring insert diameter. Response speed is proportional to the square of diameter of the measuring insert: if diameter is reduced by half, response time is reduced by 4 times, i.e. response speed increases four times. Response time is almost independent of the larger pipe diameter, which can be standard: 6, 8, 12 mm).

Choice of diameter of the tip of external protection tube depends on the length of immersion part and total length Ln, and not on response time.

Connection head – rotating:
Rotating head allows the thermoelement to be easily screwed into process, because while screwing, the head does not turn, even though process connection is welded to external protection tube. After finishing the screwing, head can be turned to the desired position and fixed in that position.
From structure point of view:

Mineral-insulated mantel measuring insert guarantees greater resistance to vibrations and is used for higher operating temperatures (Tmax=500°) even with small diameters of measuring insert in order to reduce response time.

Replaceable measuring insert, through connection head, without dismantling the complete thermoelement.

Terminal block of measuring insert, for electrical connection, with metal parts made of stainless steel and blocks made of plastic resistant to high temperature: Unlike ceramics, this solution provides excellent insulation and there is no oxidation even in case of high humidity.

Tapered tip is made of solid material, not welded. This design makes it much stronger and more resistant to pressure, fluid flow and corrosion.

Built-in length of resistance thermometer can be:
-constant (achieved by means of process connection which is welded to protection tube),
-adjustable (achieved by means of a compression connection, which is movable along protection tube).

Technical characteristics are specified in the configurator.
By filling in the configurator, an order code is generated, which defines the product.

Use
– chemical industry,
– petroleum industry
– thermal power plants and hydroelectric power plants,
– food industry,
– pharmaceutical industry,
– construction machines, plants, containers…

More information

CONFIGURATOR >>