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7 Temperature monitor and protection devices
7.1 Mechanical temperature monitor: temperature limiter
All waterbaths are fitted with a mechanical temperature limiter (TB) Protection Class 1 to DIN 12880.
If the electronic control unit should fail during operation and the fixed factory-set maximum temperature is
exceeded by approx. 30°C the temperature limiter switches off the heating permanently as a final protective
measure. The symbol lights up continuously as warning.
7.2 Low-level protection
In addition to its function as overtemperature protection the TB also operates as low-level protection,
i.e. the heating is switched off permanently if the liquid drops below a certain level. As a warning the
symbol lights up continuously.
Fault rectification after the TB cut-out has been activated:
Switch off the bath and allow it to cool down
Rectify the fault (e.g. top up the liquid, replace temperature probe) and where appropriate contact
customer
service
The bath is again ready for operation only after it has cooled down and after the fault has been
rectified
7.3 Monitor relay
In addition the bath is equipped with an electronic monitor relay.
If a fault occurs during operation or if the selected setpoint temperature is exceeded by 10°C, then the
monitor relay continues control of the heating at this temperature in emergency operation.
The symbol flashes as warning.
Fault rectification after the monitor relay may been activated:
Check the controller for error messages (see section 12) and where appropriate contact customer service.
Example:
With a setpoint temperature of 80°C, if a fault occurs in the power unit (faulty triac) the bath continues to
operate in emergency operation at approx. 90°C.
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BASIC
