Glass thermometers

Glass laboratory thermometers for precise measurements

Glass laboratory thermometers are the foundation for precise measurements in modern research units. By taking advantage of the phenomenon of liquid expansion, instruments from the KWT or Ludwig Schneider brands offer the reliability necessary for the most demanding chemical and physical processes.

The main advantages of professional tube thermometers:

• perfect integration with the equipment thanks to WS grinding,
• ensuring full tightness of reactors and process stability,
• possibility of using mercury filling up to 350°C,
• use of toluene for operation at temperatures as low as -80°C,
• protection of the capillary with an inert gas against oxidation,
• High reading precision thanks to 0.1 degree increments.

High-quality glass guarantees excellent dimensional stability, which directly translates into repeatability of results. However, it is important to remember to maintain proper working technique and properly immerse the device. The final confirmation of the reliability of the readings are calibration certificates, documenting the precision of the device in the entire measuring range.

Tubular and interchangeable ground thermometers WS

The precision tubular thermometers and WS ground models from KWT are distinguished by their exceptional measuring sensitivity. Thanks to the use of a thin capillary, the liquid column reacts almost immediately to temperature fluctuations. This is crucial in processes such as distillation or chemical synthesis, where precision determines the success of the research.

These devices are perfect for demanding industrial environments, effectively supervising the operation of machines and installations. Their unique design guarantees users a number of significant benefits:

• exceptional sensitivity to temperature changes thanks to the capillary,
• instant integration with the apparatus by standard cuts,
• high resistance to aggressive chemicals,
• maintaining the highest accuracy after many years of operation,
• clear scale for fast and error-free reading of data,
• ensuring process safety and obtaining reproducible results.

Thermometers for refrigerators and sample storage

Thermometers that support the -50°C range are the foundation for safety in places where compliance with HACCP standards and the protection of biological material are a priority. In laboratories, these devices constantly monitor the condition of drugs and vaccines, guaranteeing their full effectiveness. The KWT brand offers extremely precise instruments in this area, which are perfect for any professional diagnostic point.

Maintaining stable thermal conditions is the key to reliable results, which is why home replacements simply fail in professional use. Specialized models ensure the highest measurement accuracy, which directly translates into the durability of sensitive substances. Thanks to the manufacturer's wide range of products, you can easily choose a variant perfectly suited to a specific refrigerator or laboratory freezer, being sure that the stored resources are safe.

Professional solutions guarantee:

• constant monitoring of the status of medicines and vaccines,
• strict adherence to HACCP standards,
• effective protection of biological material,
• the highest accuracy of parameter measurement,
• perfect fit for laboratory refrigerators,
• full safety at diagnostic points.

Thermometric liquids: mercury and toluene

The choice of liquid filling the thermometer determines not only the measuring range, but above all the safety of the user. Although mercury used to be the standard, valued for its stability at high temperatures, an EU directive from 2009 eliminated it from widespread use due to its high toxicity. Modern devices use modern substances that guarantee the precision of tests and are environmentally friendly:

• safe and non-toxic galinstan,
• liquid alloy of gallium, indium and tin,
• alcohols dedicated to low temperatures,
• brightly colored, red toluene,
• substances compliant with environmental protection standards.

The characteristic red or blue color of these substances is not accidental. The bright color makes the narrow bar in the capillary much more visible, which makes it easier to read quickly. The use of chemically pure reagents allows manufacturers to maintain the highest quality, while ensuring ecological production standards and full functionality of measuring instruments.

Measuring range from -80 to +360°C and accuracy of 0.1°C

The KWT brand pushes the boundaries of measurement up to 600°C. The use of precise capillaries and legible milk scales guarantees exceptional reading accuracy. The equipment is fully compliant with the international ITS-90 scale, which ensures consistency of test results. The main advantages of the equipment are:

• high resistance of specialized glass to temperature jumps,
• low hysteresis, effectively preventing capillary deformation,
• elimination of errors resulting from the natural aging of the raw material,
• availability of specialized meteorological models,
• Consistent repeatability and certainty of each result obtained.

The depth of immersion is crucial for the reliability of the measurement. In the TOGO series, the correction for the protruding liquid column must be taken into account, especially when the operating conditions differ from those adopted during calibration. This approach allows you to maintain the highest standards and avoid errors in documentation.

Thermometric glass with invariable metrological properties

Specialized thermometric glass guarantees reliability and precise measurements. The material is waterproof and hygienic, and the lack of nickel or PVC makes it safe for allergy sufferers. The high tightness and resistance of the raw material allow for regular sterilization, which is necessary in laboratory work. The unique profile of the case acts as a magnifying glass, making it easy to read the results in an instant. In models that require shaking off liquids, protective cases and "butterfly" shakers help.

By choosing these professional instruments, you gain:

• maximum hygiene without the risk of allergies,
• the possibility of safe disinfection,
• excellent scale visibility,
• permanent capillary structure,
• full chemical resistance.

Partial Immersion Calibration and Indication Corrections

Calibration is the foundation of professional quality control, allowing you to precisely verify the accuracy of glass thermometers. PCA-accredited laboratories issue official certificates that provide formal proof of measurement consistency with international standards. For partial immersion instruments, it is crucial to take into account the ambient temperature around the capillary, which requires an appropriate correction to be applied to the protruding liquid column.

In demanding industries such as winemaking or biotechnology, temperature stability directly affects the quality of the final product. To avoid measurement errors due to sudden fluctuations in air temperature, professionals use thermal buffers, for example with propylene glycol.

Investing in reliable metrology provides a number of significant benefits:

• reliable documents from accredited PCA units,
• precise calculations for immersion thermometers,
• stabilization of readings thanks to the use of buffer liquids,
• safety and repeatability of biotechnological processes,
• full compliance with stringent quality management systems.

We invite you to check the full range of glass thermometers on our website!