49
Handling Precautions
CAUTION!
Furnace may be cracked
Though the furnace may be cracked when it is used with high temperature, this does not affect
the use or performance of this unit.
Open/close door in high temperature affects the device
Do not open/close the door as possible at the in-furnace temperature of 500
℃
or more, which
affects the lives of sensor, oven and heater. Quickly open/close it after operation if necessary.
Do not leave door open for a long time at high temperature
Leaving the door open for long time at high temperature may cause a radiation heat, which could
result in breakdown on the operation panel or controller.
Fine powder may fly
This unit uses an iron chrome heater. Fine powder from its protective film (oxide film) is
possible to be flown during operation. Protect the sample with a cover if needed.
Make protective film on heater
The heater used on this unit forms a protective film on its surface under high temperature.
Make the film by operating this unit for ten hours at the temperature of 1050
℃
when using it
under the temperature of 700
℃
or less.
Heater corrosion
The heater used on this unit can be corroded with halogen elements such as chlorine, fluorinate
or alkali metals such as sodium or potassium. Do not contact these materials to the heater.
Sensor deterioration
The sensor on this unit (R thermocouple) is very sensitive. Do not contact it to samples when
loading or unloading them. Do not touch the sensor with bare hands, which may cause the
degradation.
Sensor corrosion
The sensor used on this unit can be corroded at high temperature with reducing substances such
as alkali metal, metal steam, metal oxide, carbon monoxide, carbon, phosphorus, selenium or
arsenicum or other reducing ambiences. Do not use these materials.
When using N2 gas…
Under the Atmosphere of N2 gas, high temperature nitrides the surface of heater, which prevents
the formation of protective film on it. Upper limit temperature for use is, therefore, lower than
that under atmospheric air. Use the temperature within the range of 100 to 900
℃
when
operating this unit under N2 gas.
Notes for the independent overheating prevention device
In case there is a small difference between the set values of temperature for the independent
overheating prevention device and that of controller, the overheating prevention device may be
activated with displaying
Er.07
when the temperature reaches to the set value of controller. Set
the temperature of overheating prevention device so it be at least 100
℃
or more higher than that
of controller. (When the setting temperature is lower, there is a case that overshoot occurs
because this unit is high temperature type furnace. This overheating prevention device should be
used for protect the unit.)
・
The default value of the overheating prevention device at factory
shipment is 1200
℃
.
