Type 341 and 347 dial thermometers operate on the expansion principle. The non-toxic gas (primarily nitrogen) in the measuring system expands with rising temperature. This causes an increase in pressure, which deforms the bourdon tube. This deformation is converted into pointer rotation by mechanical components and an instrument mechanism. The resulting pointer deflection is proportional to the temperature change.
Dial thermometer types 341 and 347 are the tried and tested industrial solution for in situ, local temperature measurement of fluids and gases in the industrial sector. They are ideal for installation in pipelines, containers, machines and plants, have a long service life and do not require any external power.
Diesel engine thermometer types 6312 to 1372 are the ideal solution for local temperature measurement of fluids and gases on large diesel engines, e.g. for marine propulsion or in the diesel electric power generation area. Depending on the display range, they are useful for measuring exhaust gas, cooling water, lubricating oil and charge air temperatures.
All models of our dial thermometers conform to EN 13190 Class 1.