30
Handling Precautions
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 at in-oven temperatures of 500
℃
or more, this affects the lifespan 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) may be
discharged into the air 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
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 N
2
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 N
2
gas.
Notes for overheating prevention device
In case there is a small difference between the set values of temperature for overheating
prevention device and that of controller, the overheating prevention device may be activated with
displaying
Er.19
when the temperature reaches to the set value of controller. Set the temperature
of overheating prevention device so it be at least 100
℃
or 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 to protect the unit.)
·
The default value of the overheating prevention device at factory shipment is 1200
℃
.