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4. Operating procedures
Operating sequence (Overheat protector settings)
The stand-alone overheat protector consists of a temperature measurement circuit, CPU, sensors,
and the output circuit separate from the controller. When the protector is activated, the unit will stop
and will not recover until the earth leakage breaker is turned on again. (Manual recovery)
Temperature setting for the stand-alone
overheat protector
70
℃
①
Set the temperature with the
▼▲
keys.
About the stand-alone overheat protector
When the difference in the set temperatures between the stand-alone overheat
protector and the controller is small, the protector may be activated and operation
may be stopped. Set the temperature for the protector at least 5
℃
higher than that
for the controller. Note that the protector is not available for the purpose of
protecting specimens.
The temperature is set at 70
℃
at the time of shipping.
If you want to operate the stand-alone overheat protector at a temperature you want,
first operate the unit with the temperature in the bath at that setting until operation
becomes stable, then gradually lower the protector setting and make sure that it
operates reliably at the temperature setting you want. It takes about five seconds
before it starts operation for which time you have to wait before checking. When the
protector is triggered, it displays Er07 and operation stops. Since the activation
temperature for the sensor of the protector differs depending on overshoot at the
time of heating or specimen status, set it at as high temperature as possible.
Also, when the protector set temperature has been changed, wait for about five
seconds until that temperature is recorded before turning power off.