The main categories of pressure switches include normally open and normally closed. The main features are: 1. It adopts British pipe thread quick joint or copper pipe welded installation structure, which is flexible to install and easy to use, and requires no special installation and fixing. 2. The insert type wire type connector can be arbitrarily selected by the user. 3. Sealed Stainless Steel sensor is safe and reliable. 4. The pressure range can be manufactured according to the pressure value selected by the user. The pressure switch has two types: mechanical type and electronic type. The mechanical type pressure switch is divided into a plurality of types, and the electronic type is also divided into a plurality of types. The electronic pressure switch amplifies the pressure signal through a high-precision instrumentation amplifier, collects and processes data through a high-speed MCU, and has a built-in temperature sensor for temperature compensation. It is a high-precision device for detecting pressure and liquid level signals, and realizing pressure, liquid level monitoring and control. Widely used in chemical, mechanical, hydrological, electric power, environmental protection and other automated systems for measuring gas and liquid pressure. Because the adjustment is convenient and flexible, the installation is simple and can replace most occasions where the liquid level switch is used. Features: High-precision AD and high-speed microprocessor, fully digital design; 4-digit digital tube displays current pressure or liquid level value; pressure or liquid level can be set according to your own needs; three units can be selected according to customer needs: Bar, PSI, Kpa; can set high and low pressure or liquid level alarm point, and output to control equipment through relay or optocoupler; output dual relay (single pole double throw) switch; two relays / two optocouplers / with 4-20mA /0-10V output can be selected; using high-precision pressure sensor, higher precision than mechanical pressure switch, small hysteresis, fast response, stable and reliable; adjust no dead zone, can set the relay action pressure point arbitrarily within the entire range; Key adjustment action pressure, easy to use, more flexible; Protection level: IP65, can be used in harsh environments; Technical parameters: Range: -1BAR ~ 200MPa; Supply voltage: 12 ~ 35V DC (24V DC calibration voltage) / AC 220vAC power supply output relay capacity: 220V AC 3A, 24V DC 5A; Accuracy: better than 0.5% FS Setting range: Full-range segment can set monitoring points, anti-fluctuation hysteresis setting. Operating temperature: -20 ° C -85 ° C; Protection level: IP65 Sampling rate: 10 times / sec (can be customized according to customer needs). Interface thread: M20*1.5/G1/4/1/4NPT Operating instructions: l Character description: SEt has entered the setting state S AL Enter the alarm setting AL has entered the alarm setting S UN Enter the unit setting UN has entered the unit setting PSI unit PSI bAr Unit bar kP Unit KP S AL Enter low alarm setting S AH Enter high alarm setting S Ad Enter differential setting S SC Range setting FULL Full scale calibration oooo Zero calibration S FO Enter basic parameter setting 0—H Overvoltage entry setting: Press SET After releasing the button for two seconds, the button enters the setting state: the panel displays SEt.l Press the UP button and the DOWN button, the panel cyclically displays S AL, S UN and SEt, and press the SET button to enter the selected parameter to be set; Select S AL, the panel displays AL; select S UN, the panel displays UN; select SEt to exit the setting state. l Data setting selection 1) S AL: In this setting category, press the UP and DOWN keys shortly, the panel will display AL, S ALd, S ALL and S ALH cyclically (select AL will exit the setting directly); Description: Short press SET Go to the settings you need to modify. After entering the setting, the flashing bit is currently selected and can be modified. Short press the UP button and DOWN button to select the bit to be modified; short press the SET button to enter the current bit value to modify, short press the UP button and DOWN button to modify the current bit value, short press The SET key determines the current bit value, and the meter automatically returns to the next data set by S AL; short press the UP and DOWN keys to continue selecting the desired bit to be modified. If the modification is completed, press the SET button twice to exit the current data modification, and the data will be saved. In the setting process, you can press and hold the SET button at any time to exit the setting state, and the original data remains unchanged. 2) S UN: In the setting category, short press the UP button and DOWN button, the panel cyclically displays UN, PSI, bAr and kP. Short press the SET button to select the unit, and the meter automatically exits the setting state. (Select UN will exit the setting directly) Range and calibration settings: 1. Press and hold the UP button and DOWN button for about two seconds, enter the range and calibration settings: S FO; 2. Short press the UP button and DOWN button, the panel will cycle to display S SC, FULL, oooo, and S FO, short press the SET button to select the parameter to be set. The range setting is the same as the alarm parameter setting; when entering the zero point and full scale calibration, the digital tube will display the data value collected by the current AD. When the displayed data is an intermediate value, press the UP key (DOWN key) briefly, and the data displayed at this time. The change is no longer updated and the value is the calibration value that will be saved. Press the DOWN button (UP button) shortly. (If there is no such step, the data will not be saved.) Finally, press the SET button to exit the setting state and the parameters will be saved. 3: In the normal display state, press the left (right) button to display the high (low) position action point setting value. Wiring diagram: + --- Power positive (red); (24VDC) - --- Power negative (black); H-COM --- High alarm common (green); H-OFF --- High alarm normally open (White); H-ON --- High alarm normally closed (brown) / 24v (+); L-COM --- Low alarm common (blue); L-OFF --- Low alarm normally open ( Yellow); L-ON --- Low alarm normally closed (gray) / 24V (-). The diaphragm type pressure switch uses a high-precision, high-stability pressure sensor and transmission circuit, and then uses a dedicated CPU modular signal processing technology to realize the detection, display, alarm and control signal output of the medium pressure signal. Reference: Refer to HPC-100, HPC-1000 pressure switch manual Electrical Steel,Galvanized Steel,Cold Rolled Steel Comat Metal Products Co., Ltd. , http://www.china-tinplate.com