Unit description
15.05.01
YAEE0013
5
3.3 Temperature indication, control and safety circuit
The unit is provided with a 2-line LCD-Display with additional symbols for indicating bath temperature and
settings as well as operating states. The setpoint is input and additional adjustments can be made using
either two or three keys.
Remote operation is possible via an isolated RS 232 interface
A Pt 100 temperature probe is used for measuring the actual temperature and for control. A second Pt
100 serves as temperature probe for the safety circuit (overtemperature protection) which is independent
of the control function
A low-level cut-out switches off the heating on both poles in order to prevent dry operation of the heater.
The pump is switched off through the electronics. The setting of the overtemperature cut-out is adjusted
with a tool on a potentiometer and is always limited to 5 °C above the operating temperature range. A
floating contact "Combination fault" is available (➾ Section 6.5.4.).
All settings and fault messages are stored in the memory on supply failure or when the mains switch is
set to OFF
The tubular heater is controlled from a modified PID controller through a triac circuit specially designed to
be unaffected by supply variations and interference.
3.4 Materials
All parts which come into contact with the bath liquid are made from high-grade materials appropriate to
the operating temperature. These are rust-free stainless steel, the plastics PPS, polycarbonate (bath
006 T, 015 T, 012 T, 020 T) and fluoride rubber.
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