PERFECT page 28
The manually set monitor temperature and the electronic overtemperature protection are monitored on
IPP/ICP-incubators by an adjustable temperature monitor (TWW) Protection Class 3.1 to DIN 12 880, or
by an adjustable temperature limiter (TWB) Protection Class 2 to DIN 12 880. The choice of temperature
monitor is selected in SETUP (see the menu item Tolerance margin ASF in Section “Basic oven settings”)
Adjustable temperature monitor (TWW) Protection Class 3.1 to DIN 12 880
If the manually set monitor temperatur
MAX
is exceeded, the TWW takes over the control of the temperature
and starts to control at the monitor temperature. As a warning the alarm symbol is flashing.
TB approx. 20°C above Tmax
TWW set manually
setpoint temperature
220°C
150°C
20°C
t
°C
controller fault
emergency operation
Adjustable temperature limiter (TWB) Protection Class 2 to DIN 12 880
If the manually set monitor temperature
MAX
is exceeded, the TWB switches off the heating permanently
and can only be reset by pressing the SET key. As a warning the alarm signal is flashing.
TB approx. 20°C above Tmax
TWB set manually
setpoint temperature
220°C
150°C
20°C
t
°C
controller fault
heating switched off by TWB
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