Glossary of Terms

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

E

EasyUse Operation

In the LAUDA Proline, this comprises: drain taps - for cooling thermostats even at the front, rollers and handles for increased mobility, double pump connection for the parallel connection of two external systems, and switching of the circulation (bypass). Further features include the detachable console (Command version) for use as a remote control and the quick-change of the required interface. This facilitates comfortable work.

Emulsion

A disperse system consisting of two immiscible liquids, such as water or an aqueous solution and an organic. The dispersed or inner phase is present in form of small droplets, surrounded by the dontinuous or matrix phase.

Environmental temperature range

This is the admissible temperature range in which the unit can be operated in accordance with the regulations.

Evaporator

See refrigerant.

Expansion volume / Expansion tank

When heating up the heat transfer medium to the desired operating temperature, the heat transfer medium expands. This expansion volume results from the expansion coefficient, the temperature change and the contents of the unit. The expansion tank installed in the temperature control unit has to collect the expansion volume safely. The assessment of the dimensions of the expansion tank for thermal oils depends on DIN 4754. The following applies for hot water: about 0.8 % per T = 10 K., for mineral oils: about 1 % per T = 10 K. and for silicone oils: about 2 % per T = 10 K.

External control

If the outflow temperature is not the controlled and a temperature measured outside the temperature control unit is used, then the outflow temperature of the heat transfer fluid is tracked in such a way that the setpoint is reached at the external point. In practice this is achieved via a so-called cascade control (see cascade control). The so-called 'master controller' produces in its capacity as the control variable (see control variable) the setpoint for the post-connected slave controller (see slave controller), the slave controller controls the outflow temperature of the heat transfer medium liquid.

External control

A temperature control by which the thermostat is controlled from a connected external system. Temperature probe is therefore required in the external system that is connected to the thermostat. The set value entered at the thermostat is compared with the actual value in the external consumer and applies temperature control to the thermostat in the sense of a cascade controller. Depending on the operating temperature, insulation losses and exothermia, the bath temperature and thus the inlet temperature of the consumer can be considerably above or below the set value.

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