UE逻辑压力开关防爆开关J120-554（UE logic pressure switch explosion-proof switch J120-554 ）

J120-550  J120-551  J120-552 J120-553 J120-554 J120-555  US UE pressure switch Teflon diaphragm and fluorine rubber Viction-O ring, stainless steel pressure port. Application of explosion-proof pressure switches 1. Explosion-proof pressure switches are widely used in petroleum, chemical, metallurgy, electric power, sugar, pharmaceutical and other industries where pressure control is required, and they play a role of pressure protection in automatic control systems. Among them, the all-welded stainless steel diaphragm is currently the most widely used and most reliable pressure protection method. The all-welded mode can effectively prevent liquid leakage and malfunction; it has strong corrosion resistance; metal bellows control The controller is widely used in various corrosive gases and liquids in the above industries, and can achieve higher pressure than the stainless steel diaphragm type; the rubber diaphragm type controller is used for neutral gas and liquid media. 2. Explosion-proof pressure switches can be widely used in various industries such as petrochemical, offshore platforms, water treatment, medicine, food processing, papermaking, power plants, gas, mining, biology, semiconductors, ships, national defense, and pipelines. When an emergency occurs, the explosion-proof pressure switch sends out a signal to protect the equipment, or it is applied in front of some actuators such as valves, or behind components such as bursting discs, and outputs accurate and reliable alarm signals in dangerous safety sites. Definitions of commonly used terms for pressure switches Pressure: The force acting vertically on a unit area of ​​a fluid or solid interface. Differential pressure: Differential pressure refers to the relative difference in pressure between two or more pressure points Gauge pressure (relative pressure): The difference between absolute pressure and ambient atmospheric pressure Absolute pressure: The pressure value based on absolute zero pressure Switch: a mechanical device that measures the pressure of the medium and performs feedback output and control Absolute pressure = gauge pressure + atmospheric pressure Absolute pressure = atmospheric pressure - vacuum pressure Pressure switch principle:When the pressure in the system is higher or lower than the rated safety pressure, the disc in the sensor moves instantaneously, and the switch joint is connected or disconnected through the connecting guide rod. When the pressure drops or rises to the rated recovery value, the disc The chip resets instantaneously, and the switch automatically resets, or in simple terms, when the measured pressure exceeds the rated value, the free end of the elastic element produces a displacement, directly or after comparison, the switch element is pushed to change the on-off state of the switch element, to achieve control by purpose of measuring pressure. The elastic components used in the pressure switch include single coil spring tube, diaphragm, bellows and so on. The setting range is as follows: Model Adjustable Setting Range Dead Zone Maximum Pressure                  Model Adjustable Set Point Range Deadband Over Range                              Low end of range on fall; Pressure* Pressure**                High end of range on rise              psi bar psi bar psi bar              Teflon® diaphragm and Viton O-Ring 316 stainless steel with 1/4” NPT (female) 316 stainless steel pressure connection and cap550  30 "Hg Vac to 3 "Hg Vac  -1 to -0,1                 0.1 to 0.4 "Hg 3,4 to 13,5 mbar   80 "wc   199,1 mbar551  2 to 80 ”wc                       5 to 199,1 mbar     1 to 4 "wc       2,5 to 10 mbar      80 "wc   199,1 mbar 552  30 "Hg Vac to 20 psi       -1,0 to 1,4                 0.2 to 0.5 "Hg  6,8 to 16,9 mbar   20          1,4         553  0.5 to 20                          34,5 mbar to 1,4 bar  0.1 to 0.2        6,9 to 13,8 mbar    20         1,4      554  0.8 to 30                          55,2 mbar to 2,1 bar  0.1 to 0.3        6,9 to 20,7 mbar    30         2,1        555 2 to 100 0,1 to 6,9 0.2 to 0.4 13,8 to 27,6 mbar 100 6,9   

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