48
Advanced functions
7.3.3 Automatic temperature monitor (ASF)
ASF is a monitoring device that automatically follows the set temperature setpoint within an
adjustable tolerance band ( Fig. 25 ).
The ASF is activated – if switched on – automatically if the actual temperature value reaches
50 % of the set tolerance band of the setpoint (in the example: 37 °C – 1.5 °C) reached for the
first time (section A). The activation of the ASF is shown by the brightly lit
AUTO
icon.
When the temperature moves outside the set tolerance band around the setpoint (in the
example in Fig. 25: 37 °C ± 3 °C) – e. g. if the door is opened during operation (section B of
illustration) – the alarm is set off. This is shown by the flashing
AUTO
and icons.
If the acoustic alarm is switched on in the SETUP, the ASF alarm is additionally signalled by an
intermittent tone. If the SET key is pressed, the horn can be temporarily switched off until the
next alarm event occurs.
The ASF alarm goes off automatically as soon as 50 % of the set tolerance band of the set-
point (in the example: 37 °C ± 1.5 °C) are reached again (section C).
If the temperature setpoint is altered, the ASF is automatically disabled temporarily (in the
example: The setpoint is changed from 37 °C auf 30 °C, section D), until it has reached the
tolerance range of the new temperature setpoint (section E).
40 °C
34 °C
ASF active
40 °C
34 °C
ASF alarm
ASF active
ASF active
33 °C
27 °C
°C
37 °C
t
A
B
C
D
E
AUTO
AUTO
AUTO
Fig. 25
Schematic diagram of how the ASF temperature monitoring functions
Switching on the automatic temperature monitor:
g
p
Select the AUTO icon with the push-turn control.
Hold down the SET key and set to
on
with the push-turn control.
MIN
MAX
AUTO
°C
Switching off the automatic temperature monitor:
g
p
Select the AUTO icon with the push-turn control.
Hold down the SET key and set to
off
with the push-turn control.
f
The tolerance band for the ASF can be set in the SETUP in the
range
0.5
...
5
°C (see page 44 ).
MIN
MAX
AUTO
°C
