Dry spring-type pressure gauge contact with anti-vibration environment, and the pulse of media properties such as impact load, the general electrical contacts instrument applies only to the copper or copper alloy no corrosive effect of liquids, gases and other media pressure measurement, dry spring-type contact Instruments also has the advantage of high temperature acid. General contact-damping device submerged in liquid, their contact attachment Film, increased contact resistance, so that contact can not work effectively, dry reed instrument of the contacts vacuum packaging signal switch is reliable, long life, particularly applicable to （24V, 12V） DC voltage control signal for the user to switch, it's obvious advantages to fill the electrical contacts in the low-voltage pressure gauges on the application of the gaps and meet the needs of the inligent control.