Memmert ICH 256 Climate Chambers (Generation 2003) - Manual (Page 56)

56
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 violates 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
AUTO
and icons flashing.
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 acoustic alarm can be temporarily switched off
until the next alarm event occurs.
The ASF alarm is automatically triggered as soon as 50 % of the set tolerance band of the
setpoint (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 this
example: The setpoint is changed from 37 °C to 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 works
Switching on the automatic temperature monitor: Switching on the automatic temperature monitor:
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: Switching off the automatic temperature monitor:
Select the AUTO icon with the push-turn control.
Hold down the SET key and set to off with the push-turn control.
off off
The tolerance band for the ASF can be set in the SETUP
in the range 0.5 ... 5 °C (see page 53 ).
MIN
MAX
AUTO
°C