Glossary of Terms

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

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F

FDA

Abbreviation for the Food and Drug Administration, United States. Prescribes binding guidelines for the development and production of pharmaceutical products: is internationally valid.

Feed pressure

Feed pressure is the manometric pressure measured at the outlet nozzle of a pump or a compressor. As far as pumps are concerned, the feed pressure also results from the pump characteristics and is the product of delivery head (see pump characteristic) and the density of the flow medium.

Fill volume

In connection with a LAUDA unit, the recommended filling amount of the system (volume) which is required in order to guarantee a trouble-free operation, and to allow for expansion or contraction of the system throughout its operating temperature range.

Film temperature

The maximum film temperature, which the manufacturer indicates with reference to organic heat transfer mediums, describes the temperature at which the heat transfer mediums begin to decompose. Especially when organic heat transfer mediums are heated up with the help of electric heaters, attention must be paid to the heat flux values because otherwise the heat transfer medium is destroyed by a high surface or film temperature. In this connection it has to be proven through a flow or a heat technological layout according to DIN 4754 that the admissible film temperature cannot be reached with an adequate safety distance.

Fire point

The fire point according to the EN 61010 standard is the most important criterion for the upper limit of a bath liquid. According to ISO 2592 it is the temperature at which a liquid in an open vessel burns for at least 5 seconds. The fire point of a bath liquid is decisive for its maximum permitted temperature that must be not higher than 25 °C below the fire point.

Flash point

The flash point of a flammable liquid indicates the lowest temperature at which the vapour produced can ignite for a short time, i.e. for less than 5 seconds. The temperature limits of LAUDA bath liquids are mostly considerably below the corresponding flash point in order to avoid any danger.

Flow rate

The volume of liquid delivered per time unit by the circulating pump measured with water. If only one value is given in the table, this is the maximum flow rate at counterpressure zero. In the diagrams the flow rate is given depending on the discharge pressure (counterpressure).

Flow rate

Volume flow of a pump or a compressor. The flow rate depends on the respective operating point and the characteristics (see pump characteristic) of each component.

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