Glossary of Terms

Here you will find a glossary of specialised terms commonly used in thermostating and metrology.

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O

Oil Cooling Units

Self-contained units, supplied with an oil to air heat exchanger, circulating pump, fan and control gear. They are designed to remove heat from a process in which the coolant temperature can be above the ambient temperature (this is typically 10°C above the ambient i.e. 25°C ambient equals 35°C onto process).

Operating temperature range

The temperature range that is limited by the permissible lowest and highest operating temperatures. As a rule, this is only given for heating thermostats whose working temperature range can be extended to lower temperatures by means of auxiliary equipment, and the maximum to which it can be extended is the lower limit of the operating temperature range.

Operating temperature range

The temperature range that can be run in the heat transfer medium flow line to the process equipment (outflow).

Overlay pressure/Inert gas covering

Through an inert gas covering (nitrogen) on the expansion tank, oxidation of the heat transfer medium and seeping of water vapour from the air can be prevented. If the heat transfer medium is operated below its evaporation point, overlay pressure should be as low as possible (about 0.1 bar), so that when heating up through the reduction of the gamma space the pressure increase is not too high. If the heat transfer medium operated above its evaporation point and atmospheric pressure (1.013 bar), an overlay pressure of at least the respective vapour pressure is necessary in order to safely prevent cavitations. In both cases a safety valve has to be installed on the expansion tank.

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