FineControl LS-20 Operation Manual page 35

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"Control High Limit" then the corresponding switches will turn on and when the
reading is below the "Control Low Limit" the
corresponding switches will turn off.
Low Limit: For the control of heater type device, it means when the reading is below the
"Control Low Limit" then the corresponding switches will turn on and when the
reading is above the "Control High Limit" the corresponding switches will turn off.
Control High Limit/Control Low Limit: Set the High/Low limits for the control of the corresponding
switches. Empty value will not activate any switches.