Memmert INB 200 - 500 Incubators (Generation 2003) - Manual (Page 14)

BASIC page 14
9 Temperature monitor and protection devices
9.1 Temperature limiter (TB)
All ovens of the BASIC series are equipped with a mechanical temperature limiter (TB) Protection Class 1
to DIN 12 880.
If the electronic monitor system should fail during operation and the fixed factory-set maximum temperature
is exceeded by approx. 20°C the temperature limiter switches off the heating permanently as a final
protective measure. The alarm symbol lights up as warning.
Fault rectification after the TB cut-out has been activated:
1.
Switch off the oven and allow it to cool down
2. Rectify the fault (e.g. replace temperature probe) and where appropriate contact customer service
3. The oven is again ready for operation only after it has cooled down and after the fault has been
rectified.
9.2 Monitor relay
In addition to mechanical temperature protection the oven is provided with an electronic monitor relay.
If a fault occurs during operation or if the selected setpoint temperature is exceeded (by 3°C on ovens Series
INB, by 10°C on ovens UNB/UFB/SNB/SFB) the monitor relay switches over the heating to this temperature
in emergency mode. The alarm symbol is flashing as warning.
Fault rectification after the monitor relay may been activated:
Check the controller for error messages
(see Section „Error messages“) and where appropriate contact
customer service.
TB approx. 20°C above
monitor relay approx. 10°C above setpoint
setpoint
220°C
150°C
20°C
t
°C
control fault
emergency mode
Example: UFB500:
With a setpoint temperature of 150°C, if a
fault occurs in the power unit (faulty triac)
the oven continues to operate in emergency
operation at approx. 160°C.