17
4.
Operation Method
Setting of Overheating Prevention Device
The unit has the overheating prevention device (manual reset) that consists of independent
temperature measurement circuit, CPU, sensor and output circuit (it shares power source, display,
and key input with the controller) in addition to the automatic overheating prevention function (auto
reset) in the controller.
Setting range/function
The unit has failsafe functions against overheating. One of them is built in the controller and
previously set at factory shipment so to be automatically activated when the temperature exceeds the
setting temperature of temperature controller by 12
℃
, where the heater repeats on and off.
The other is united with the controller, which can be set by operating the keys on the controller.
The setting range of latter is from 0
℃
to max set temperature of main cont 50
℃
.
In case the temperature in furnace exceeds the setting temperature of controller to reach to that of
overheating prevention device, the circuit is shut off and "Er19" is displayed with blinking on the
screen of controller with buzzer sound. If the device is once activated,"Er19"continues to be displayed
until the power is newly turned on.
Temperature setting procedure
1. Turn on the power (turn on the ELB)
The default value is displayed for about 4 seconds after
turning on the power. The screen then displays the initial
setting. The current temperature in furnace, operation mode
character and setting temperature of overheating prevention
device are displayed on respective screens.
2. Set the temperature for overheating prevention
①
Press the SUBMENU key.
②
Press the "▼▲" several times to select the setting
character
of
overheating
prevention
temperature
"OH"
.
③
Press the ENTER key. The current setting temperature is
displayed with blinking on the setting temperature screen.
Note:
To prevent improper operation, set the value 20
℃
or more over the setting temperature of controller.
④
Select the value using the "▼▲"and then press the
ENTER key. This completes the setting.
Caution
①
The standard setting temperature of device is "the maximum setting temperature of unit + 20
℃
" or "setting tempe 20
℃
". If the unit performs improper operation, increase it 5
℃
more.
②
Improper setting of temperature may cause inoperative of unit, malfunction of device, e.g. it is
activated during increasing in temperature in furnace, or unexpected accidents such as fire
disaster. To prevent such matters, set a proper value.
The temperature of DP83C/104C is set to 220
℃
at factory shipment.
③
The purpose of overheating prevention device is to protect the unit from overheating. It does
not intend to protect the samples, or to protect them from the accident caused by the use of
explosive or inflammability.
测 定 温 度
℃
加热器
确 定
设定温度
过升防止
开始
停止
定 值
故障
自动停止
自动开始
定值运转
程序运转
时 间
功 能
程 序
③
②
确 定
测 定 温 度
℃
加热器
设定温度
过升防止
开始
停止
定 值
故障
自动停止
自动开始
定值运转
程序运转
时 间
功 能
程 序
④
④
①
