Yamato Scientific DVS602 Constant Temperature Drying Oven - Manual (Page 18)

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4. Operating procedures
Settings for overheat prevention device
The safety device for preventing overheat has the automatic overheat prevention function for the
controller (automatic recovery) and has the power supply, the display and the key input assembly in
common with the controller as well as it has an overheat prevention device (manual recovery) as a
secondary safety measures that consists of separate temperature measurement circuit, the CPU,
the sensor and the output circuit.
Temperature setting range and functions
The device has overheat prevention function in double. One is the function integrated in the
controller, which is designed to be activated automatically at a temperature 12℃ above the set
temperature of the temperature controller (the heater repeats ON/OFF at +12℃) at the time of
shipping from the factory.
Another is integrated with the controller and is set with the keys on the controller.
The secondary overheat prevention function is added by this setting.
The temperature range settable for the overheat prevention device integrated with the controller is
“0℃ to the 50℃ + the highest set temperature for the device.”
When the temperature in the bath keeps rising beyond the controller set temperature and reaches
the set temperature of the overheat prevention device, the circuit trips, Er19 flashes on the controller
screen, and the buzzer continues to sounds.
When the overheat prevention device is activated, it will not be released until power is turned on and
Er19 will not be released.
How to set temperature 1. Turn power ON. (Turn the ELB to ON.)
When power is turned ON, the initial values will be displayed
for about four seconds, then the initial screen will appear and
the current bath temperature, operation mode character and
the overheat prevention set temperature are displayed on
each of the displays.
MEASURED TEMP.
℃
HEATER
ALARM
AUTO STOP
AUTO START
ENTER
SET
TEMP.
OVER TEMP.
PROTECTOR
FIXED TEMP.
RUN
STOP
SUB
MENU TIMER FIXED
TEMP. PROGRAM
PROGRAM
MEASURED TEMP.
℃
HEATER
ALARM
AUTO STOP
AUTO START
ENTER
SET
TEMP.
OVER TEMP.
PROTECTOR
FIXED TEMP.
RUN
STOP
SUB
MENU TIMER FIXED
TEMP. PROGRAM
PROGRAM
2. Setting the overheat prevention temperature
① Press the SUB MENU key.
② Press the ▼▲ keys to select the overheat prevention
temperature setting character oH for the
MEASURED TEMP. display.
③ Pressing the ENTER key displays the current set
temperature flashing on the SET TEMP. display.
Caution: In general, set to a temperature at least 10℃
higher than the controller set temperature to
prevent the device from malfunctioning.
④ When the temperature you want is obtained with the ▼▲
keys, press the ENTER key to complete setting.
Caution
① Set temperature as “highest operation temperature for the unit +20℃” or “set temperature
+20℃” as a rough standard and add 5℃ to the setting if the device functions improperly.
② Be sure to set the overheat prevention activation temperature correctly otherwise the device
may not start, the overheat prevention device is activated before temperature in the bath
increases completely, or a fire or other unexpected accidents may result.
The temperature is set at 290℃ on shipping from the factory.
③ The overheat prevention device has been designed to prevent overheating of devices not to
protect samples. The device does not prevent accidents caused from use of explosive or
flammable materials.
①
②
③
④ ④