Ab c d e – Memmert ICH 256 Climate Chambers (Generation 2003) User Manual

Page 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

33 °C

27 °C

°C

37 °C

AUTO

Fig. 25

Schematic diagram of how the ASF temperature monitoring works

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:

Select the AUTO icon with the push-turn control.
Hold down the SET key and set to off with the push-turn control.

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