Memmert VO49 - Page 39

D39374 | Date 08/2018 39
Operation and control
5.4.2 Automatic temperature monitor ( ASF)
ASF is a monitoring device that automatically follows the set temperature setpoint within
an adjustable tolerance band (Fig. 29).
The ASF – if switched on – is automatically activated as soon as the actual temperature
value reaches 50 % of the set tolerance band of the setpoint (in the example: 180 °C -
1.5 K) for the first time (section A).
When the temperature violates the set tolerance band around the setpoint (in the exam-
ple in Fig. 29:
180 °C ± 3 K) – e.g. if the door is opened during operation (section B of illustration) –
the alarm is set off. The ASF alarm is automatically terminated as soon as 50 % of the
set tolerance band of the setpoint (in the example: 180 °C ± 1.5 K) are reached again
(section C).
If the temperature setpoint is altered, the ASF is automatically disabled temporarily (in
this example: The setpoint is changed from 180 °C to 173 °C, section D), until it reaches
the tolerance range of the new temperature setpoint (section E).
183 °C
177 °C
ASF active
183 °C
177 °C
ASF alarm
ASF active ASF active
176 °C
170 °C
180 °C
t
ABCDE
AUTO AUTO AUTO
Fig. 29 Schematic diagram of how the ASF temperature monitoring works
5.4.3 Mechanical temperature monitoring: Temperature limiter ( TB)
The appliance is equipped with a mechanical temperature limiter (TB) of protection class
1 in accordance with DIN 12 880.
If the electronic monitoring unit should fail during operation and the factory-set maxi-
mum temperature is exceeded by approx. 20 °C, the temperature limiter, as the final
protective measure, switches off the heating permanently.
5.4.4 Adjusting temperature monitoring
1. Press the activation key to the left of the
ALARM display. The temperature set-
ting is automatically highlighted.
min
000°C
ALARM
max
000°C
auto off
99K
-
+
ALARM
max
auto
K
min
+
-
120.0°C
0.0
100.0°C