Thermometer Manufactory
Handcrafted Precision Thermometers
Our eXacal precision thermometers are handcrafted in our manufactory in Fulda/Germany – and can even be custom-made to your specifications upon request. We can individually implement your desired modifications regarding the handle, connector, or even the length of the sensor and connection cable.
The thermometers are optimized for precise temperature measurement. Depending on the model, they are used in the temperature range from -200°C to 1200°C.
In addition to thermometer design, another focus is on developing our own tools and production processes. During design, production, and final accredited calibration according to DIN EN ISO/IEC 17025 (DAkkS), no external suppliers are needed besides raw materials. This independence ensures the high quality of the thermometers.
See a tour of the Thermometer Manufactory in the video:
Manufacturing Process Overview
Mechanical Production
Required components, such as handles or prototypes for further development, are produced through machining.
Precious Metal Welding Process
Thermowires and connection cables are precisely welded by hand. The required fuel gases, hydrogen and oxygen, are not stored in bottles but are generated in a 2:1 mixing ratio from water using electrolysis. This guarantees the purity of the fuel gas.
Laser Welding
Particularly delicate connections, such as the connecting wires of temperature sensors, are welded under a microscope with precision lasers.
Thermal Treatment of Thermomaterial
One of our core competencies is the targeted thermal treatment of thermowires. Our aging processes ensure a metallurgically stable and thermoelectrically homogeneous state of the eXacal thermocouples.
Aging of Resistance Thermometers
Resistance thermometers are fully aged according to our adapted aging cycles in a specially constructed aging oven with oxygen purging.
Wire Coil Winding
For our SPRT temperature sensors, high-purity, ultra-thin platinum wire is wound into a fine wire coil using a specially designed winding machine.
Cleaning of Ceramic Components in a Tube Furnace
All ceramic components installed in our precision thermometers are cleaned at high heat in a tube furnace before use.
In-house Manufactured Temperature Sensors
The production of temperature sensors is a complex craft requiring a very precise process, which we carry out ourselves in our manufactory. Our experienced employees thread ultra-thin platinum wire onto a ceramic or quartz carrier body by hand under a microscope. Before this step, the platinum wire passes through the winding machine to be formed into a fine coil. In our thermometer manufactory, we further process these extremely sensitive temperature sensors into precision thermometers.
3D Printing Process
Insulation elements and complex plastic parts inside the handles, such as strain reliefs, are produced using a modern 3D printing process. This offers us many advantages. Complex designs are manufactured without manual detours and expensive tools, saving a lot of time and money. Through 3D printing, eXacal thermometers can be custom-made as a modular system.
Inhomogeneity Scanner
Potential inhomogeneities of the eXacal thermocouples are investigated using an inhomogeneity scanner. A movable heat source tests the entire thermomaterial of the measuring point for local inhomogeneities.
The inhomogeneity scanner is an in-house development by Klasmeier. It significantly improves the thermocouples from the eXacal Manufactory:
more realistic consideration of measurement uncertainties
verification of thermal treatment
improvement of quality and manufacturing processes
