Proline Kryomats
18
Unit description
YAUE0007 / 2/26/2009
The VarioFlex pump operates short-term up to viscosities of 150 mm²/s. In the closed-loop control
mode 50 mm²/s should not be exceeded. The temperature control is the best with 30 mm²/s and lower
viscosity.
For operation as a circulating thermostat with an external load, the highest possible power level is
practicable to maintain the temperature difference low, among other things also with higher
temperatures in conjunction with oils as heat transfer liquid.
Pump characteristics
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4.4
Materials
All parts being exposed to the heat transfer liquid are made of high quality material appropriate to the
operating temperature. Non-rusting stainless steel and high quality temperature-resistant, primarily
solvent-resistant plastics are used.
4.5
Temperature display, control and safety circuit
The Master control element is equipped with a 5-character green LED display, which is used for the
display of the measurements and settings, as well as the operating status. The entry of setpoints and
other settings occurs under menu guidance via four keys.
The more comfortable and removable Command control element includes a backlit graphical display.
The entry of the setpoint and other settings occurs under menu guidance via situation-dependent cursor
keys and soft keys.
A Pt100 temperature probe acquires the current temperature in the bath. A high-resolution A/D converter
processes the measurement. Further measurement conditioning occurs using a special control algorithm
for controlling the heater actuator, which has a low reactive effect on the mains, and the SmartCool
refrigeration equipment together with further transducers.
An external Pt100 temperature probe can be connected via a socket (10S) for the acquisition of an
external temperature. This value can be displayed and, if required, used as the controlled variable with
external control (Master) switched on. In this way, the system controls the external measurement and
not the internal bath temperature (
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The safety system conforms to DIN EN 61010-2-010. The SelfCheck Assistant monitors about 50 unit
parameters. A dual-channel system is used in which two microcontrollers monitor one another. Along
with the bath temperature measurement and control probes, there are also two safety temperature
probes (Pt100) for the safety circuit for the overtemperature cut-off and for monitoring the bath
temperature probe.
The overtemperature cut-off point is displayed on pressing the key
on the Master.
Changing the overtemperature cut-off point: (
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The bath level is acquired by the SelfCheck Assistant in 8 stages. If the minimum level is undercut, the
pump, heater and the SmartCool System refrigerating machine are switched off. The reaction of the
thermostat in case of overfill can be set to simply display a warning, to display a warning and switch off
the heater or to switch off the unit completely with pump, heater and SmartCool System refrigerating
machine.
