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MK / MKT (E5) 08/2020 page 76/162
12.3 Over/under temperature safety device class 2 (option)
Example: MK 56
The over-/under temperature safety device (4) consists of two entry mod-
ules (4a) and (4b) located in the lateral control panel. Both modules can
be set from -50 °C / -58°F (MK) or -80 °C / -112 °F (MKT) up to 200 °C /
392°F and serve to define the maximum high and low temperature 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 band-
width, the temperature control, and herewith the heating and refrigeration,
are turned off permanently.
At the corresponding entry module, the pilot lamp “1” lights up.
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 temperature
range.
Then reset the alarm message on the controller (see chap. 11.3) to re-
activate the chamber. The pilot lamp “1” goes off as soon as the temper-
ature will again be below / above the threshold.
Setting limit temperatures at modules (4a) and (4b):
The upper line shows the actual temperature. The bottom line shows
the set-point of the limit temperature.
• Press the arrow-up or arrow-down key
The display changes to entry mode: The set-
point in the bottom
line flashes
• Enter the desired limit temperature via the arrow keys and confirm
with the “OK” button.
• Press the Back button.
The set-point in the bottom line stops flashing.
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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