Glossary of Terms

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

• A
• B
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• D
• E
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• I
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• T
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• W

B

Bath depth

The overall dimension from the upper edge to the bottom of the bath. Since the liquid may generally be filled to a maximum of 20 mm below the upper edge, the usable depth is stated as a value that is 20 mm less than the bath depth.

Bath opening

The usable surface that is available for direct thermostating, as a rule over the entire usable depth. Exceptions are the Ecoline thermostats with baths 003, 011, 019, 025 and 006 T, in which the usable area is reduced due to the conical shape of the bath as it narrows towards the bottom.

Bath thermostat

A thermostat which is equipped with a bath that also holds the object to be thermostated. The built-in circulating pump is preferably used to mix the bath liquid, but can also be used if necessary to convey the liquid through an externally connected circuit, e.g. connection of a through-flow cooler to allow the cooling of heating thermostats.

Bath volume (also filling volume)

The volume of the bath liquid that is required for appropriate operation of the thermostat, but without considering the volume of the bath liquid in the external liquid circuits. If two values are given, the lower value indicates the minimum required amount, the upper value the permissible maximum amount. The difference is the so-called expansion volume. Especially in the case of circulating applications, a large expansion volume is advantageous, since the circulation thermostat must also take up the expansion of the liquid in the external circuit. This expansion volume is especially large with process thermostats.

Bath/circulating thermostats

Thermostats with an adequate bath opening to hold objects for direct thermostating in the bath or a circulating pump for closed or open external circuits.

Billmeyer formula (IV value according to Billmeyer)

Serves the purpose of the approximate calculation of the intrinsic viscosity of polyesters and others. No additional polymer characteristic data required.

Boiling point

The boiling point identifies the temperature at which a liquid begins to boil. This temperature is dependent on atmospheric pressure, and the boiling point is therefore specified at a standard pressure of 1013 mbar.

Bubble pressure tensiometer

Used to determine the surface tension of liquids from the pressure in gas or air bubbles that are generated in the measuring liquid with a capillary of known dimensions. This method is not suitable for determining interfacial tensions between liquid phases.

Bus system

See interface.

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