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Resistance thermometer with welding thermowell form 4 (former D-sleeve) according to DIN 43772
Resistance thermometers with welding thermowell (53-WHD) are used for temperature measurement in gaseous and liquid media such as air, steam, water, oil, etc. with high current velocities and pressures. The material of the thermowell defines the operation temperature. Specialised thermowells are suitable up to 700 bar of pressure. The instruments of this product line are fitted with exchangeable mineral-insulated measuring inserts.
The main construction component is a thermowell of high-grade or pressure-vessel steel, which is used to weld the thermometer into the respective machine.
Selection of the thermowell is dependent on spatial proportions at the point of installation, as well as demands as dictated by tem- perature, pressure, current flow and chemical attack.
Standard values for stress capacity can be found in the diagrams of DIN 43772.
In particular the question of chemical stress capacity must be ex- amined carefully for each individual scenario. Often times, only field testing will yield authoritative information, as even minor impurities in the ambient media can have significant impact on the perfor- mance of the thermowell within the application environment.
For specialised applications (precision, long-term stability, etc.) we recommend the application of precision resistors with narrowed tolerance.
Resistance values and tolerances of our resistance thermometers are according to DIN EN 60751.
Application examples for resistance thermometers with welding thermowell
Waste recycling / waste incineration
Plant and machine construction
Automobile industry
Chemical industry
Laboratories
Energy production
