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A set of switches controls two meters

2016-11-22View Original

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Inside the analysis cabin, two oxygen meters are connected to an explosion-proof purging unit; this unit has a set of pressure switch signals, and it is these pressure switch signals that control the power supply for the two oxygen meters. To save costs, contactors or relays are currently being used to control the power supply for the two meters. Do anyone have any other better ideas? Add an explosion-proof junction box to the contactor section; are there any other potential hazards? Control as shown in the figure below

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