Yamato Scientific DN410I Inert Oven - Manual (Page 75)

25
INDEPENDENT OVERHEAT PREVENTION
There are two safety devices in this unit: the auto-overheating preventive function of the
controller (automatic recovery) and the independent overheating prevention (manual recovery).
Circuits and sensors that are independent from the controller configure them. These safety
devices for the temperature overheating prevention protect the instrument in a fail-safe method.
Setting the Temperature Range and Function
Setting
Temperature:
0 to 399
o
C
Input Method: Three integer digital switch. Turn the drum of each column and set the desired
value. The first integer can only be from 0 to 3 for the hundred columns.
Function: Heater output is cut off when the measured temperature gets higher than the set
temperature of the independent overheating prevention. The function is active
when the earth leakage breaker is ON.
When the independent overheating prevention is activated, is flashing on the
main display with the TROUBLE lamp flashes. When the independent overheat
prevention is active while the heater is in the temperature rising process, etc.,
and flash alternately on the display.
Activation/Setting Method
1. Set the independent overheating prevention 15
o C higher than the set temperature of the main
unit.
2. When setting the proper value to protect the sample, be sure it is well above room temperature,
and set it at least 15
o
C higher than the maximum temperature set value of the temperature
pattern of the program.
3. When the independent overheating prevention is activated improperly by changing the setting
of the independent overheating prevention lower than the internal temperature or by continuing
operation when the setting on the unit is too low, turn off the earth leakage breaker to reset the
unit and perform the setting again. If it is activated by another reason, see chapter of Safety
Devices and Error Codes on page 24.
Precautions
1. Only 0 to 3 can be set for the column of hundreds of the digital switch by the stop mechanism;
however, if forced to change it to a value higher than 3, it will damage the unit.
2. Set temperature can change by touching the setter when cleaning. Always confirm that the
set temperature is correct after cleaning or before operation.