19
4.Operating Procedures
Setting of the overheat preventive device
The safety device to prevent overheat has the power supply, the display, and the key entry assembly
common with the controller in addition to the automatic overheat preventive function (automatic
recovery) of the controller. In addition to them the device has an overheat preven6ti device (manual
recovery) consisting of an independent temperature detection circuit, a CPU, sensors, and an output
circuit creating a two-fold safety mechanism.
Set temperature range and related functions
The unit has dual overheat preventive functions. One is integrated in the controller, which has been
set to activate automatically at a temperature of 12
℃
+ set temperature on the temperature controller
at the time of factory shipping (the heater repeats ON/OFF at 12
℃
+ the set temperature).
The other is integrated with the controller and is set with key operation on the controller.
This setting adds the second overheat preventive function.
The set temperature range for the overheat preventive device integrated with the controller is
“0
℃～
highest set temperature of the unit +50
℃
”.
If in-bath temperature should keep rising exceeding the controller set temperature and reach the set
temperature of the overheat preventive device, the circuit will be shut off, Er19 will flash on the
controller screen, and the buzzer keeps sounding.
When this overheat preventive device has activated, Er19 will be held without being released until you
turn power on again.
How to set a temperature
1.Turn power on (Turn ELB ON
）
When you turn power on, the initial values will be displayed for
about four seconds and the screen will change to the initial
setting screen, and each of indicators displays the current
in-bath temperature, operation mode characters, and overheat
prevention set temperature.
MEASURED TEMP.
℃
HEATER
ENTER
SET
TEMP.
OVER TEMP .
RUN
STOP
SUB
MENU
TIMER
FIXED
TEMP.
PROGRAM
PROTECTOR
ALARM
AUTO STOP
AUTO START
FIXED TEMP.
PROGRAM
MEASURED TEMP.
℃
HEATER
ENTER
SET
TEMP.
OVER TEMP .
RUN
STOP
SUB
MENU
TIMER
FIXED
TEMP.
PROGRAM
PROTECTOR
ALARM
AUTO STOP
AUTO START
FIXED TEMP.
PROGRAM
2.Set an overheat preventive temperature
①
Press
SUB MENU
key.
②
Press
▽
and
△
keys to select the overheat preventive
temperature setting character oH
on the
measured temperature indicator.
③
Pressing
ENTER
key will flash the current set temperature
on the set temperature indicator.
Caution
：
Usually, set this temperature at least 30
℃
higher
than the controller set temperature to prevent a
wrong operation.
④
When the temperature you want is set with
▽
and
△
keys, press
ENTER
key to complete setting.
Caution
①
Use
”the highest temperature possible for this unit
＋
30
℃
” or “Set temperature
＋
30
℃
” as a
rough standard
” for set temperature and if a malfunction occurs at such settings, add about
5
℃
.
②
Be sure to set temperature for overheat preventive function correctly. Otherwise, the device
may not operate correctly, the overheat preventive device may erroneously activate while
in-bath temperature is increasing, or a fire or other unexpected accidents may result.
The temperature has been set at 290
℃
at the time of factory shipping.
③
The overheat preventive device does not aim to protect specimens but to prevent overheat of
devices. It is not able to prevent accidents caused by use of explosive or flammable materials.
Summary of Contents for DKG610
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