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Overview / Design Principle:
This recording temperature controller incorporates two switches which operate in fixed relationship to the temperature setting. Differential between switches can be adjustable up to 5% of scale range. Like other RF series recorders, this unit has a 10" chart, may be flush or surface mounted. Unit is shipped with brackets for surface mounting operation. UL and CSA listed.
Operation:
This unit incorporates two snap-setting switches mounted on a common setting arm (red pointer) and actuated by the same temperature response mechanism which moves the recording pen.
First to be actuated on a temperature rise is the leaf-type switch. The second, a pin type switch, is actuated only when the recorded temperature exceeds the operation of the first switch.
Switches are mounted one behind the other, each having its own circuit. Temperature actuation points between the two switches (differential) is adjustable from 0 to 5 percent of scale range with tolerance on switch settings ± 1/2%. Adjustment is made by set screws inside the instrument case.
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