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Option No.1General 1.) This product is used as pressure control or pressure protection. When the system reaches the set value, the switch turns on/off the electricity automatically.2.) Except for automatic reset, the manual reset at high voltage end is available as well as the manual reset at both high and low voltage ends.3.) The circuit connected inside the pressure controller that integrates the high and low pressure ends as one unit is applicable for various kinds of refrigeration systems.4.) Pressure and pressure-difference adjusting with the graduate are furnished.5.) Suitable mediums are compressed air, Freon , water and oil..6.) The connector adopts the standard oviduct type with M12 x 1.25 screw thread.7.) Medium temperature: - 20 to +120'C; Environment temperature: - 20 to +70'C.Option No.2 General 1.) This product is used as pressure difference control. When the system reaches the set value, the switch turns on/off the electricity automatically.2.) Pressure and pressure-di