Integral XT
YAWE0028 / 24/06/2016
Device description
23
4.3
Hydraulic circuit and Vario pump
The hydraulic circuit in the unit partly consists of a pipe system through which the temperature stabi-
lizing liquid flows under pressure.
The main components are:
pipe system,
equalizing tank (with no flow),
pump,
heater and
heat exchanger.
All devices are equipped with an eight-level, hermetically sealed (magnetically coupled) pump. The
pump power can therefore be optimally matched to the respective task: High pump pressure when, for
example, long hoses lead to external loads.
Alternative to eight power levels, operation with closed loop pressure control is available for supplying
processes (loads) with a maximum permissible pressure rating e.g. pressure sensitive glass reactors.
On the right side of the device outflow and return connection pieces are fitted for external loads.
In the heating range the pump operates up to cinematic viscosities of 200°mm²/s. In normal operation
50°mm²/s should not be exceeded. From 30°mm²/s the temperature control is optimum.
The device pump connections are fitted with threaded connections M30 x 1.5 or M38 x 1.5 according
to DIN 3863.
Pump characteristics
(
þ
4.4
Substances / materials
All parts coming into contact with the media liquid are made of high quality material suitable for the
operating temperature. Non-rusting stainless steel is used almost exclusively. To a slight extent
brass/copper is used where the media temperature is 200 °C maximum. Sealing materials: Graphite,
copper, PTFE, FKM, polymer seals.
4.5
Temperature display, control and safety circuit
The devices are fitted with a removable command operating console with back-lit graphical display
which is used for displaying the measurements and setting values as well as the operating states. The
entry of the set value and other settings occurs using menu guidance via context sensitive cursor and
"soft" keys.
A Pt100 temperature probe measures the outflow temperature in the device. A high resolving A/D
converter processes the measurement. Further measurement processing occurs via a special control
algorithm for driving the heating power actuator and the special cooling system with further measure-
ment transducers.
An external Pt100 can be connected via a socket (10S) for measuring an external temperature. This
value can be displayed and if required, used as the controlled variable when the external controller
(master) is switched on. In this way the system control is based on the external measurement and not
on the outflow temperature.
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