Memmert HPP 108/749 Constant climate chamber (Generation 2003) - Manual (Page 45)

45
Advanced functions
7.3.2 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 50°C ± 1°C) is 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 : 50°C ± 2°C) – e.g. if the door is opened during operation (section B of il-
lustration) – the alarm is set off. This is shown by the flashing
AUTO
and icons.
If the acoustic alarm is switched on in the SETUP (see page 42 ), the ASF alarm is additionally
signalled by an interval sound. If the SET key is pressed, the acoustic signal 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 setpoint
(in the example 50°C ± 1°C) is reached again (section C).
If the temperature setpoint is altered, the ASF is automatically disabled temporarily (see in
the example: The setpoint is changed from 50 °C auf 25 °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