Memmert ONE 7 - 45 Oilbath (Generation 2003) - Manual (Page 19)

EXCELLENT page 19
7 Temperature monitor and protection devices
The monitor temperature is measured with a separate Pt100 temperature sensor inside the chamber. The
monitor unit provides protection for the bath load as well as protection for bath and its surroundings.
The bath is provided with duplicate overtemperature protection (mechanical / electronic) according to DIN
12880.
7.1 Mechanical temperature monitor: temperature limiter
All water- and oilbaths are fitted with a mechanical temperature limiter (TB) Protection Class 1 to DIN
12880.
If the electronic monitor system 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 fault indication.
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.
Fault rectification after the TB cut-out has been activated:
1.
Switch off the bath and allow it to cool down
2. Rectify the fault (e.g. top up the liquid, replace temperature probe) and where appropriate contact
customer service
3. The bath is again ready for operation only after it has cooled down and after the fault has been
rectified
7.2 Electronic temperature monitor
Note:
The monitor temperature must always be set sufficiently high above the maximum
working temperature.
The manually selected monitor temperature of the electronic overtemperature protection is monitored in
the case of waterbaths either by an adjustable temperature monitor (TWW) Protection Class 3.1 to DIN
12880 or by an adjustable temperature limiter (TWB) Protection Class 2 to DIN 12880, and in oilbaths by
an adjustable temperature limiter (TWB).
On waterbaths the temperature monitor can be selected in the setup menu (see section 4.3.8 or 4.3.8.2).
For details of temperature monitor and protection class see rating label.
Monitor temperature
Adjustment range: up to 10°C max
above nominal temperature (for
nominal temperature see rating
label)
°C
Using the push/turn control select the
monitor temperature.
With the SET key depressed, use the push/turn
control to set the monitor temperature.