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SIKA Thermometer – An Accurate Measuring Instrument for Life

Glass thermometers from SIKA measure reliably and without deviations over their entire product life if installed correctly. But how can life-long accuracy be guaranteed? The measuring accuracy of the thermometers corresponds to the standard DIN 16195 “Requirements and testing of industrial glass thermometers”.

The most important component of a SIKA thermometer is the actual measuring device, the glass insert. During production, all SIKA glass inserts are matched at several test points. Once in crushed ice at 0°C and once in a water bath at a second or third test point depending on the measuring range. 0°C is compared with melting ice, since it has basically this temperature and no reference thermometer is required. A calibrated glass thermometer is used as the reference thermometer for the second or third test point, for example at +70°C. When calibrating these test thermometers, the display correction is determined, taking into account the thread temperature, and the correction is taken into account during the check.

All inserts that deviate from the temperature are removed from the system, evacuated (emptied) and reworked until the error limits of +/- one to two degrees Celsius are adhered to in accordance with the DIN standard. For the field of application of an industrial thermometer, the defined error limits are sufficient in any case and were determined on the basis of the applications in the standards committee. In the end, these instruments should measure the temperature, for example in a heating system. No high-precision measurements are necessary here.

Once the glass inserts are sealed, they do not lose their accuracy. They are not subject to ageing, since they do not contain any moving parts in the same way as a dial thermometer. In addition, they function without auxiliary energy (battery). This means that industrial glass thermometers are maintenance-free and lose their function only when the glass insert is mechanically destroyed.

A further advantage of these measuring devices is that they are three-part (aluminium top, glass insert and immersion tube). They can therefore be disassembled with little effort. If the glass insert has been damaged, the upper part can be unscrewed and the glass insert replaced without having to empty the process, because the immersion tube can remain installed in the pipeline. Pointer devices do not have this advantage. In this case, the device must be installed within an additional protection tube.