Overtemperature And Low Level Protection; Overtemperature And Low Level Protection Testing - Lauda Alpha A Operating Instructions Manual

7.12.2

The units are designed for operation only with non-flammable liquids to
DIN EN 61010-2-010.

Overtemperature alarm
S A F E

7.12.3 Overtemperature and low level protection testing

Every 6 month or before the unit is running unattended for longer periods this protection should be
tested.

Overtemperature alarm
S A F E
32

Overtemperature and low level protection

 The overtemperature cut-off point is activated close above 110 °C
and can not be changed.
 If the bath temperature rises above the overtemperature cut-off

point or the liquid level is too low ( 6.2):
1. Alarm sounds as dual-tone signal.
SAFE
2.
3. The red LED
 Heater switches off on all poles;
 Pump and refrigerating unit are switched off electronically.
 Rectify cause of fault.
 Wait until the bath temperature has cooled below the cut-off point.
Unlock the thermostat ( 7.12.4).
Therefore:
 Remove the heat transfer liquid of the thermostat ( 6.2).
 Turn on thermostat and set the set temperature to a value a couple
degrees above ambient temperature.
 The heater of the thermostat will now start heating. Attention the

heater will get very hot. Don't touch it at any time.
 Wait about 45 seconds until the protection device will shut off the
heater and the pump and the alarm
 If it takes more then 45 seconds for the overtemperature protection
to get triggered immediately cut out the power manually and have
the equipment checked by the LAUDA Service Constant Tempera-
ture Equipment or the local service organization.
 Refill the heat transfer liquid ( 6.2).
 Unlock (reset) the alarm ( 7.12.4).
 Shut off the control head and turn it on again. The alarm must have
disappeared now.
for overtemperature cut-off point appears in the display.
above the fault triangle
Starting up
Alpha
flashes.
SAFE
will appear.
June 20, 2018/ YACE0092