We have a lube oil unit for a fan. We have a temperature switch in the tank to inhibit the start when the temp is below 20'c, so this is one switch point correct? We also have another temperature switch that controls the heaters in the tank by turning them on when the temp is below 20 'c and turns them off when another temp is reached. Would this be a switch with two switch points or one switch with adequate hysteresis.
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