– 3 –
“Any control system design should take into account that any part of the system has the potential to fail”.
“For temperature control systems, continued heating should be considered the most dangerous condition,
and the machine should be designed to automatically stop heating if unregulated due to the failure of the
control unit or for any other reason”.
The following are the most likely causes of unwanted continued heating:
1) Controller failure with heating output constantly on
2) Disengagement of the temperature sensor from the system
3) A short circuit in the thermocouple wiring
4) A valve or switch contact point outside the system is locked to keep the heat switched on.
In any application where physical injury or destruction of equipment might occur, we recommend the instal-
lation of independent safety equipment, with a separate temperature sensor, to disable the heating circuit in
case of overheating.
The controller alarm signal is not designed to function as a protective measure in case of controller failure.
Safety Precautions
WARNING
Over-temperature Protection
Before using this product, the user is requested to read the following precautions carefully to ensure the
safety. Safety precautions must be taken by every user to prevent accidents.
The safety requirements are classified into “Warning” and “Caution” according to the following interpreta-
tions :
Warning
Suggesting that the user's mishandling can
result in personal death or serious injury.
Caution
Suggesting that the user's mishandling can result
in personal injury or damage to the property.
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