Binder MKF 115, Operating Manual

Page: 63 / 115

MKF+ MKFT (E3.2) 07/2017 page 63/115
12. Temperature safety devices
12.1 Over temperature protective device (class 1)
The chamber is equipped with an internal temperature safety device, class 1 acc. to DIN 12880:2007. It
serves to protect the chamber and prevents dangerous conditions caused by major defects.
If the actual temperature exceeds the nominal temperature by approx. 20 °C, the over temperature pro-
tective device permanently turns off the chamber. The user cannot restart the device again. The protec-
tive cut-off device is located internally. Only a service specialist can replace it. Therefore, please contact
an authorized service provider or BINDER service.
12.2 Safety controller (over-temperature safety device class 2)
The chamber is equipped with an over temperature safety device class 2 acc. to DIN 12880:2007. It is
designated as the “safety controller”. This second, electrically independent temperature controller takes
over at a selectable set-point in case of fault. It serves to protect the charging material against extremely
high temperatures.
With the option over-/under temperature safety device class 2 (chap. 12.3), the safety control-
ler must be set to maximum temperature.
The safety controller only activates after the set-point has been reached once.
The message “TEMPERATURE LIMIT” on the controller display indicates safety controller activity. The
safety controller controls the chamber to the entered safety controller set-point until the temperature in-
side the chamber returns below this temperature and until you then reset the alarm message by button
RESET.
Regularly check the safety controller setting for set-point type “Limit” or “Offset”
•
in Manual Mode according to the entered set-point temperature value
•
in Program Mode according to the highest temperature value of the selected temperature
program
Set the safety controller set-point by approx. 10 °C above the highest temperature set-point.
Safety controller set-point types:
Limit Absolute maximum permitted temperature value.
Example:
Temperature set-point 100 °C/ 212 °F
Limit value (safety controller set-point) set to 110 °C.
Offset
Maximum over temperature above the active temperature set point. The maximum tem-
perature changes internally and automatically with every set-point change it.
Example:
Temperature set-point 100 °C / 212 °F
Offset value (safety controller set-point) set to 10 °C.
Do NOT change the temperature unit from °C to °F.