Calculation of thermowells in temperature measurement

In temperature measuring devices, thermowells form the interface between the sensing element and the process. They protect the actual probe while they themselves are exposed to thermal, chemical and mechanical stresses.

For the safe operation of temperature measurements with thermowells, the following must be observed:

Thermowells are placed in a state of spatial stress by static pressure. Bending and shear stresses are added when flow is applied.

Behind flow-loaded thermowells, vortices are periodically detached. However, this effect, which is required for vortex flow meters, also leads to undesired oscillations of the thermowell and thus to its destruction if the frequency of the vortices does not deviate significantly from the resonant frequency of the thermowell.

For strength calculations, all stresses are combined into one equivalent stress, which should have a safety factor > 1.7 with respect to the hot yield strength or the creep strength of the material.

The risk of a thermowell failure can be significantly reduced by calculating the stresses prior to design.

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71 products
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OPTITEMP TRA-H61

Resistance (RTD) temperature assembly for hygienic applications

OPTITEMP TRA-H65

Resistance (RTD) temperature assembly for hygienic applications

OPTITEMP TRA-F13

Resistance (RTD) temperature assembly for standard applications

OPTITEMP TRA-F23

Resistance (RTD) temperature assembly for standard applications

OPTITEMP TRA-F42

Resistance (RTD) temperature assembly for standard applications

OPTITEMP TRA-G10

Resistance (RTD) temperature assembly for surface temperature measurement in industrial applications

OPTITEMP TRA-G20

Resistance (RTD) temperature assembly for surface temperature measurement on double-walled pipes or similar applications

OPTITEMP TRA-H10

Resistance (RTD) temperature assembly for hygienic applications

OPTITEMP TRA-H20

Resistance (RTD) temperature assembly for hygienic applications

OPTITEMP TRA-H30

Resistance (RTD) temperature assembly for hygienic applications

OPTITEMP TRA-P10

Resistance (RTD) temperature assembly for standard applications

OPTITEMP TRA-P14

Resistance (RTD) temperature assembly for standard applications or use in existing thermowells

OPTITEMP TRA-P20

Resistance (RTD) temperature assembly for standard applications

OPTITEMP TRA-P40

Resistance (RTD) temperature assembly for standard applications

OPTITEMP TRA-S11

Resistance (RTD) temperature assembly for lower temperature applications

OPTITEMP TRA-S12

Resistance (RTD) temperature assembly for standard applications

OPTITEMP TRA-S21

Resistance (RTD) temperature assembly for lower temperature applications

OPTITEMP TRA-S22

Resistance (RTD) temperature assembly for standard applications

OPTITEMP TRA-S34

Resistance (RTD) temperature assembly for use in existing thermowells or machinery

OPTITEMP TRA-S41

Resistance (RTD) temperature assembly for standard applications

OPTITEMP TRA-S50

Resistance (RTD) temperature assembly for use in existing thermowells or machinery

OPTITEMP TRA-T30

Resistance (RTD) temperature assembly for higher flow velocities and pressures

OPTITEMP TRA-TF31

Resistance (RTD) temperature assembly for higher flow velocities and pressures

OPTITEMP TRA-TF33

Resistance (RTD) temperature assembly for higher flow velocities and pressures


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