UE压力开关J402-520J402-521（American ue pressure switch J402-520 J402-521 ）

American ue pressure switch J402-520 Pressure switch American ue J402-521 American ue mechanical double-point pressure switch Pressure range: -746.7-0mbar Features: One, two or three switch output, within the range of 100% of the set point Can be individually set Epoxy housing designed to meet NEMA 4X requirements Variety of diaphragms available such as 316SS, brass, Nitrile and TEFLON Select reference scale or turn screw to adjust set point range Inches of water column Series: -300" water column vacuum to 250" water column (-746.7 to 622.3 mbar) Pressure: 30" Hg to 6000psi Differential pressure: 1" water column differential pressure to 200 psid (0 to 13,8 bar) Temperature: - 180 to 650°F (-115°C to 340°C) performance options · European ATEX intrinsically safe standard · Remote temperature switch can choose 50 feet long copper or stainless steel capillary tube and armored protective cable · Various switches Output options include manual reset, adjustable deadband, DPDT Red markers show current switch as set state applications Multi-point switch output for alarm and shutdown or pre-alarm and alarm High/low limit control or liquid level Control , water treatment and filtration system , industrial sterilization device , pump system and compressor , ideal protection for many other industrial processes and equipment  Fault phenomenon: No output signal of pressure switch Cause analysis:(1) The micro switch is damaged (2) The setting value of the switch is adjusted too high (3) The wire contact connected to the micro switch is not connected properly (4) The pressure sensitive part is poorly assembled and there is a phenomenon of stagnation (5) The pressure-sensitive element is damaged . Solution: (1) Replace the micro switch (2) Adjust to a suitable setting value (3) Reconnect to make good contact (4) Reassemble to make the action sensitive (5) Replace the pressure-sensitive element failure phenomenon : Poor sensitivity of the pressure switch Reason analysis (1) Poor assembly/excessive friction of the transmission mechanism (ejector or plunger, etc.) (2) The contact stroke of the micro switch is too long (3) Improper adjustment of the adjustment screw and the ejector (4 ) ) Improper installation, such as uneven and inclined Installation solutions: (1) Reassemble to make the action sensitive (2) Reasonably adjust the contact stroke of the micro switch (3) Reasonably adjust the position of the nail and ejector rod (4) Change to vertical or horizontal Installation . Fault phenomenon: The pressure switch sends a signal too fast Cause analysis (1) The oil inlet damping hole is large (2) The isolation diaphragm is broken (3) The impact pressure of the system is too large (4) The electrical system design is wrong Solution (1) ) The damping hole should be appropriately reduced, or a damping tube should be added to the control pipeline (2) Replace the isolation diaphragm(3) Add a damping tube to the control pipeline to reduce the impact pressure (4) Design the electrical system according to the process requirements(Editor-in-charge: )

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