30
Safety Device and Error codes
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
～
399
℃
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
and TROUBLE lamp flashes. When the
independent overheat prevention is active while the heater is in the
temperature rising process, etc., and flash alternately
and
on the display.
Activation/Setting Method
1. Set the independent overheating prevention 15
℃
higher than the set temperature of the main unit.
2. The purpose of overheating prevention device is to protect the unit from overheating. It does not
intend to protect the sample, or to protect them from the accident caused by the use of explose or
inflammability.The temperature is set to 280
℃
DE410/610,to 220
℃
DE410U/610U,to 375
℃
DT410/610 at factory shipment.
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
with setting the unit at too low temperature, 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 page29.
Precautions
1. Only 0 to 3 can be see 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.
