eXacal precision thermometer
Resistance thermometers and thermocouples
eXacal precision thermometers are used for precise temperature measurements or as calibration standards. They have been continuously optimised over many years in our thermometer manufactory to ensure the highest measurement accuracy. The range of eXacal thermometers is wide and can be used in a temperature range of -200 °C to 1200 °C. Our resistance thermometers offer a robust alternative to the extremely fragile ITS-90 standard thermometers. The eXacal thermocouples, made of platinum, are available with or without stainless steel reference junction.
SPRT (Standard Thermometers)
Robustes Sekundäres SPRT Referenzthermometer für genaueste Temperaturmessungen
Unsere SPRT (Standard-Platin-Widerstandsthermometer) dienen in der Präzisionstemperaturmessung als Kalibriernormal und zum genauen Temperaturmessen bei anspruchsvollen Anwendungen. Entwickelt, um den Bedürfnissen von Forschung, Industrie und Qualitätssicherung gerecht zu werden, bieten diese Thermometer eine hervorragende Genauigkeit und Zuverlässigkeit. Die SPRT (Standard-Platin-Widerstandsthermometer) entsprechen den Anforderungen der ITS-90.
Precision thermometer
Precision thermometer: Perfect as a temperature standard for calibrations or for precise temperature measurements. Available both as resistance thermometers (Pt100) and as noble metal thermocouples of types R/S/B, Pt/Pd and Pt/Au.
Industrial reference thermometers
Industrial reference thermometers (Pt100 and noble metal thermocouples): Perfectly designed for industrial use in traceable temperature measurements or as secondary standards in industrial calibrations, for example in a temperature dry block calibrator.
Thermometers for special applications
Special designs: We also manufacture precision thermometers to individual customer requirements, including difference thermometers, angled temperature probes and thermometers to special customer specifications.
Immersion thermometers
The eXacal immersion thermometers (platinum resistance thermometers) are temperature sensors designed for extreme environments where both the junction and leads must withstand temperatures throughout the temperature range of the temperature sensor. These immersion thermometers can be used in various applications including the calibration of sensors in laboratory coolers, autoclaves, ovens, stability test chambers and incubators. They can be fully immersed in liquids or dry media.
Modell
Questions about the eXacal manufactory?
Sprechen Sie direkt mit unserer Expertin!
Ihre Ansprechpartnerin für Präzisionsthermometer:
Elke Seewald
Leitung der eXacal Manufaktur von Klasmeier
e.seewald@klasmeier.com
+49 661 380 940-0
Thermometer Manufacture – Precision thermometers made by hand
Our eXacal precision thermometers are handmade in our manufactory in Fulda, Germany. They are specially designed for precise temperature measurements in the range from -200°C to 1200°C. Our expertise goes beyond the product: we also develop specialised tools and manufacturing processes. From design to final DAkkS calibration, we are completely independent of external suppliers, which ensures the high quality of our thermometers.
In the video you can see a tour of the thermometer factory:
An overview of the manufacturing process
Mechanical manufacturing
Required components, such as handles or prototypes for further development, are produced by machining.
Noble metal welding process
Thermocouple wires and connecting cables are welded by hand with high precision. The gases needed for burning, hydrogen and oxygen, are not stored in bottles, but are produced from water in a 2:1 mixing ratio by electrolysis. This guarantees the purity of the fuel gas.
Laser welding
Extremely delicate connections, such as the connecting wires of the temperature sensors, are welded under the microscope with precision lasers.
Thermal processing of thermo material
One area of expertise is the specific thermal processing of thermocouple wires. Our annealing processes ensure a stable metallurgical and thermoelectrically homogeneous condition of the eXacal thermocouples. Thermal processing of thermo material
Annealing of resistance thermometers
Resistance thermometers are completely annealed according to our customised annealing cycles in a specially designed annealing furnace with oxygen circulation.
Temperature detectors – Precision down the smallest detail
In the world of thermometry, the precision of the temperature detector is a crucial factor for the accuracy and reliability of a thermometer. As specialists in precision temperature measurement, our thermometer manufacturing is one of the few global producers that develop and produce temperature detectors in-house – a characteristic that sets us apart and underlines our commitment to the highest quality and customization.
3D printing process
Insulation components 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 produced without manual workarounds and without expensive tools. This saves a lot of time and money. Using 3D printing, eXacal thermometers can be customised as a modular system.
Inhomogeneity scanner
Possible inhomogeneities of the eXacal thermocouples are analysed with the use of an inhomogeneity scanner. A moving heat source tests the entire thermal material of the thermoclouple for local inhomogeneities.
The inhomogeneity scanner is an own development of Klasmeier. With this, the thermocouples of eXacal Manufaktur can be significantly improved:
More realistic analysis of the measurement uncertainties
Verification of the thermal treatment
Improving quality and manufacturing processes
eXacal technology
eXacal precision thermometers were designed from scratch. The development time took over four years. All the components used were carefully designed and coordinated with each other. The developed handle, which functions as a technology provider, is of particular importance. Thanks to its modular design, eXacal thermometers can be combined in almost any way.
The handle as a technology support
Our eXacal thermometers can be assembled as a modular system in almost any way. This is made possible by our aluminium handle, which is assembled with an individually 3D-printed insert for each thermometer. Important components such as strain reliefs, inert gas fillings or different protection tubes can thus be freely combined.
Temperature detectors
from our own manufactory
For the thermometers, we use wire-wound Pt100 ceramic resistors as the temperature detector. They are handmade and carefully stabilised. Three hand-picked types are used. They each represent the best compromise between design, stability, hysteresis and self-heating:
Thermometer wire
For the thermometer wire at the temperature detector and in the capillaries we use noble metals and no commercial sheath wires. Depending on the temperature range, these are pure silver or platinum. In this way we reduce thermoelectric effects and reduce inherent voltages in the thermometer.
Protection tubes
Protection tubes are selected with respect to thermal stress and the condition of the atmosphere. In order to optimally protect the temperature detector from mechanical and chemical influences, protection tubes made of pure ceramics, noble metals, high-temperature alloys or sapphire are used, depending on the application.
Connection wires
Connection cables for thermocouples and resistance thermometers are assembled by hand. Copper wires made of a low-stress copper alloy are used, which was specially produced for our thermometers. The insulation sheath is a strong textile sheath made of heat-treated fibreglass protection hose which is resistant to high temperatures. This protects the individual wires from mechanical stress, high temperatures and organic solvents.
High quality carrying case
All eXacal thermometers are delivered in a case, but can alternatively be ordered with a high-quality wooden carrying case. Due to the robust wooden case with the customised foam insert, the fragil thermometers are well protected during transport and storage.
Questions about the technology?
Speak directly to our expert
Your contact person at Klasmeier:
Thomas Klasmeier
kundenbetreuung@klasmeier.com
+49 661 380 940-0