Overview / Design Principle:
This unit is used to cut off a heat supply at any pre-determined temperature within the overall range of -30°F to 1100°F. It operates in conjunction with a separate temperature control to provide positive safety shutdown of industrial heating appliances. Reset button and safety light on front cover, trip free switch, fully tamperproof. UL and FM listed. Agency recognition is void if instrument is modified from factory standard.
Operation:
The high limit switch is manually reset to reactuate the equipment after shutdown. It can be reset only after temperature has returned below the high-limit setting. The switch is of a trip-free design, i.e. it will not function in the event the reset button is tied or welded down, providing protection from tampering.
It is designed primarily for user applications where high temperature limitations can be specified in advance of ordering , the OL63X is always factory preset to customer requirements and the setting adjustment is factory sealed to prevent unauthorized changing. Note: The element must be purchased with instrument to have switch set correctly. Preset limit temperature is stamped on the rating plate affixed to the side of the control case.
A cover-mounted red signal light remains “on” during normal operation. Light is de-energized the instant the high limit switch is activated. The instrument also is equipped with capstan cover screws through which a wire may be threaded and secured with a lead seal.
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