Bath, Pump; Materials; Refrigeration Unit - Lauda Integral T 1200 Operating Instructions Manual

4.4

Bath, pump

The relatively small bath contains the functional elements such as tubular heater, pump for external
circulation, evaporator or pump for internal circulation on units from T 4600, temperature probe and
low-level sensor.
In addition there is a larger expansion volume which is only partially thermally active. The front of
the equipment carries a level indicator.
The connections and sizes for the external thermostating circuit are selected to be suitable for the
pump output.
All pumps are immersion pumps. An adjustable bypass between liquid outlet and bath allows the
pressure to be reduced ( pump characteristics, Section 9).
A pressure sensor at the pump outlet measures the actual discharge pressure which can be
indicated on the display for monitoring purposes.
4.5

Materials

All components in contact with the heat transfer liquid are made from materials suitable for the
recommended liquids ( Section 6.3) and temperature. The materials used are rust free stainless
steel, copper, brass, NBR, plastics.
4.6

Refrigeration unit

The refrigeration unit consists essentially of a fully sealed compressor. The heat transfer liquid is
cooled through a heat exchanger located inside the bath, or on the more powerful units (from
T 4600) via a separate circuit with its own pump using a plate heat exchanger. Heat of
condensation and motor heat are dissipated on air-cooled units through a fan-cooled ribbed
condenser on water-cooled units through a counter-flow heat exchanger with the water flow
controlled by the condenser pressure.
The refrigerant used throughout is HFKW R-404A. The refrigeration unit is protected against
overpressure and compressor overload. With insufficient ventilation of the condenser (e.g. dirt
deposits) or in the absence of cooling water (e.g. water tap not opened) the equipment is switched
off.
16
Integral T process thermostats
Equipment description
YAWE 0026 / 21/01/2019