MK / MKT (E5) 03/2019 page 73/158
12.3 Over/under temperature safety device class 2 (option)
Example: MK 56
The over-/under temperature safety device (4) consists of two entry
modules (4a) and (4b) located in the lateral control panel. Both mod-
ules can be set from -50 °C / -58°F (MK) or -80 °C / -112 °F (MKT)
to 200 °C / 392°F and serve to define the maximum high and low tem-
perature limits.
With this option, the safety controller (chap. 12.2) must be
set to maximum temperature.
(4a) Upper module: Entry of the higher limit temperature.
(4b) Lower module: Entry of the lower limit temperature.
When the temperature inside the chamber leaves this tolerance
bandwidth, the temperature control, and herewith the heating and re-
frigeration, are turned off permanently.
At the corresponding entry module, the red pilot lamp K1 lights up (K2
is without function).
The controller displays the alarm message “Temp. safety device
(chap. 11.1.2
). Additionally there is an audible alert, provided that the
buzzer has not been deactivated (chap. 11.4).
Let the chamber heat up or cool down to the defined safety tempera-
ture range.
Then reset the alarm message on the controller (see chap. 11.3) to re-
activate the chamber. The red pilot lamp K1 goes off.
Setting limit temperatures at modules (4a) and (4b):
• Press down button P
• The display changes to entry mode
• Enter the desired limit temperature via the arrow keys
•
The entered temperature value is adopted after a few seconds.
The display shows the actual temperature again.
Function check:
Check the over/under temperature safety device class 2 at appropriate intervals for its functionality. It is
recommended that the authorized operating personnel should perform such a check, e.g., before starting
a longer work procedure.
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