Memmert IPP 110, Operating Instructions Manual

Page: 23 / 44

23
Operation and control
5.5 Temperature monitoring
The appliance is equipped with a double overtemperature protection (mechanical/elec-
tronic) in accordance with DIN 12 880. This serves to avoid damage to the chamber load
and/or appliance in case of a malfunction:
►
Electronic temperature monitoring
►
Mechanical temperature limiter (TB)
5.5.1 Electronic temperature monitoring
The monitoring temperature of the electronic
temperature monitoring is measured via the Pt100 temperature sensor in the interior.
The monitoring temperature (
Alarm Temp
) is set in menu mode in the
Setup
display
(see page 31). The setting made applies to all operating modes.
If the manually set monitoring temperature is exceeded, temperature monitoring takes
over temperature control and begins to regulate the monitoring temperature (Fig. 14).
t
°C
Setting
Alarm Temp
Set
temperature
Controller error
Emergency operation
Fig. 14 Schematic diagram of how the electronic temperature monitoring system works
5.5.2 Mechanical temperature monitoring: Temperature limiter ( TB)
The appliance is equipped with a mechanical temperature limiter (TB) of protection class
1 in accordance with DIN 12 880.
If the electronic monitoring unit should fail during operation and the factory-set maxi-
mum temperature is exceeded by approx. 20 °C, the temperature limiter, as the final
protective measure, switches off the heating permanently.