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Temperature Switches

Barksdale was the first manufacturer to offer effective ambient compensation in electromechanical switches revolutionizing temperature switch accuracy through extreme temperature changes. In a liquid-filled bulb and capillary system, ambient temperature changes affect the expansion of the fluid resulting in テ「彷alseテ「 temperature sensing. An extreme ambient change from -65テつーF to + 165テつーF will decrease the accuracy of most switches by 20% or more. Or, if the temperature changes only 70テつー, accuracy can be decreased by 15%. テつア1% Accuracy From Barksdale Bulb and capillary configurations overcome ambient temperature swings through stacking of precision, concave bimetal washers. An ambient temperature change causes the liquid fill in the bulb, capillary and bellows to expand or contract, an equal and opposite reaction occurs between the washers. This compensates for ambient temperature change assuring high repeatable accuracy even under wide ambient temperature swings. By reacting to ambient temperature changes as extreme as - 65テつーF to + 165テつーF, the accuracy of the mid-60% of the adjustable range is still within テつア1% of full-scale. Accuracy at constant ambient is テつア0.5% full scale. Local mount temperature switches are not affected by ambient temperature changes in the same way as bulb and capillary types. All of the filling fluid is exposed to the media temperature the bulb is sensing. Therefore, there is no ambient temperature influence on the filling fluid.

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