Lauda Hydro H 16, Operating Instructions Manual

Page: 21 / 34

09/2020 Hydro Water Baths 21 / 34
Low water cut-off 10.2
Code001
The heating element of the Water Bath is protected against destruction
through running dry by a low water cut-off (thermostatic over-temperature
limiter). In case of low water, the ongoing process is aborted and power supply
to the heating element is cut off. The display of the temperature controller
shows error code 001. Before restarting the unit, the Water Bath's tank must
be filled with water, as described in chapter 6 filling water into the Water Bath,
and the triggered low water cut-off must be reset.
To do so, loosen the black cap nut at the back of the Water Bath. Within the thread, a white plastic pin will now be visible
which must be gently pushed inside (e. g. with a pen) until a soft clicking sound can be heard. Error code 001 could also be
displayed alternating with the under-temperature alarm error code 002.
The efficiency of the low water cut-off can be checked by a temperature-controlled heat-up of the capillary tube sensor,
e. g. with a hot air fan (after loosening the clamps from the heating element) exceeding the switch-off temperature of
135 °C. The contact position of the fuse can be checked by a resistance measurement, after pulling off the cables. If the
fuse was triggered, the safety switch F3 (see chapter 13) will be open.
This examination must be carried out by a trained electrician.
Under-temperature alarm 10.3
Code002
If the actual temperature falls below the alarm set point, the current process is aborted. The display of the temperature
controller shows error code 002. Check the set trigger point of the alarm (see chapter 8.2.2) and set it to -9.0 K. Re-
start and observe the process in order to determine a possibly visible cause for the drop of the actual temperature,
for example
·
heavy under- or overshooting of the temperature in the tank during the regulation process
·
inserting samples into the water that are too cold
·
this alarm might also be shown alternating with error code 001 in connection with the low water cut-off being
triggered