The digital display pressure switch is also know as intelligent pressure switch, which is an intelligent and high-precision pressure control device that integrates emergency pressure, display and control. The digital pressure switch is mainly composed of pressure sensor, signal processing circuit, analog-to-digital converter, microprocessor, display screen and control output circuit.
The working principle of the digital pressure switch is to convert the pressure signal of the measured medium into an electrical signal through a pressure sensor, which is then processed by a signal processing circuit and an analog-to-digital converter, analyzed and calculated by a microprocessor. Ultimately, not only can the pressure value be displayed in real time and intuitively on the display screen, but the external device can also be precisely controlled by controlling the output circuit based on the preset pressure threshold.
Advantages of digital pressure switches
1. Accurate pressure testing and control
• High-precision measurement: Using high-precision pressure sensors and advanced signal technology, it can accurately measure pressure values, with a general accuracy of 0.5% or even higher. For example, some high-end products can reach 0.1%, which is much higher than mechanical pressure switches.
• Precise control: The night threshold can be set accurately to achieve precise control of pressure and meet the strict requirements of pressure control accuracy in various industrial occasions.
2. Intuitive display function
• Real-time display of pressure value: Through familiar display screens, such as LED or LCD digital tubes, the current pressure value is displayed in real time and clearly, which is convenient for users to read directly, without the need for a separate pressure gauge like mechanical pressure switch.
• Multi-unit switching: You can easily switch pressure units, such as MPa, kPa, psi, etc., to meet different application scenarios and user habits.
3. Rich functions and flexibility
• Multiple control modes: It has multiple control functions such as upper limit alarm, lower limit alarm, interval control, hysteresis setting, etc., which can adapt to complex and diverse industrial automation control needs.
• Adjustable parameters: Users can easily set and adjust various parameters of the pressure switch, such as alarm value, control mode, delay time, etc. The operation is simple and convenient.
• Diverse output signals: The output signals are rich in forms, such as relay switch signals, crystal output signals, analog output signals, etc., which can be compatible with different types of equipment and control systems.
4. Good stability and reliability
• Stable performance: The internal use of microelectronic technology and high-quality electronic components is less affected by environmental factors and can work stably for a long time in harsh industrial environments. For example, some products can operate normally in a temperature range of -40℃ to 125℃ and under conditions of high humidity, strong electromagnetic field interference, etc.
• Long life: There are no mechanical moving parts, no wear problems, and the life is longer than that of mechanical pressure switches.
• Self-diagnosis and protection: Some digital pressure switches have self-diagnosis functions, which can automatically detect internal faults and alarm in time. They also have protection functions such as over-voltage, over-current, short circuit and other protection functions, which improve the safety and reliability of the equipment.
5. Convenient installation and use
• Easy to install: Small size, compact structure, various installation methods, you can choose the appropriate installation position and method according to site requirements, such as threaded connection, flange connection, etc.
• Easy to operate: The operation interface is simple and intuitive. Usually, parameter setting, function switching and other operations can be completed with just a few buttons, without the need for professional technicians to perform complex debugging.
6. Remote communication and monitoring capabilities
• Remote transmission of data: Some digital pressure switches have communication interfaces, such as RS485, Modbus, etc., which can realize remote communication with the host computer or other equipment and transmit pressure data to the remote control system.
• Centralized management and control: It facilitates centralized monitoring and management of multiple pressure switches, improves the automation level and management efficiency of the production process, and is suitable for large-scale industrial automation systems and remote monitoring applications.
How to debug the digital pressure switch?
Commissioning a digital pressure switch is a relatively straight forward process but requires attention to detail. This may vary depending on the specific model and manufacturer. But the basic principles are the same, the following are the general digital display pressure switch debugging steps and precautions:
Debugging steps
1. Preparation
• Ensure that the digital pressure switch has been properly installed and is in a stable working environment.
• Check that the power supply voltage meets the specifications of the digital pressure switch and ensure that the power connection is stable.
• Prepare the tools required for debugging, such as screwdriver, multimeter, standard pressure gauge, etc.
2. Set parameters
• Enter the parameter setting interface of the digital pressure switch. This is usually done by key operation, such as short pressing or long pressing the setting key (SET) to enter the setting interface.
• Set the upper and lower limits of the digital pressure switch according to actual needs. This can be done by pressing the increase key (▲) and decrease key (▼) to adjust the value.
• Make sure the set parameters are saved correctly. In most digital pressure switches, after setting, you need to press the set key (SET) or the run key (ON/OFF) to save the parameters.
3. Wiring and inspection
• Connect the wiring terminals of the digital pressure switch to the controlled electrical circuit. Pay attention to the correctness of the wiring to avoid incorrect connection that may cause damage to the equipment or malfunction.
• Use a multimeter to check the wiring for continuity and ensure that the electrical circuit is connected correctly.
4. Testing and adjustment
• Turn on the power supply and gradually increase the pressure of the controlled medium (such as water, gas, etc.).
• Observe the displayed value of the digital pressure switch to ensure that it is consistent with the actual pressure value.
• When the pressure reaches the upper limit, check the output status of the digital pressure switch (such as normally open end closed, normally closed end open, etc.) and confirm whether it is as expected.
• If the output status is not correct, you need to readjust the upper limit value and repeat the test steps.
• Similarly, when the pressure drops to the lower limit, it is also necessary to check the output status of the digital pressure switch and make necessary adjustments.
5. Verification and Validation
• Use a standard pressure gauge to calibrate the digital pressure switch to ensure that its measurement accuracy meets the requirements.
• During the calibration process, if the measurement error is found to be large, the digital pressure switch needs to be calibrated or adjusted.
Precautions
- Safety first: During the commissioning process, be sure to follow the manufacturer’s operating instructions and safety specifications to ensure personal safety and equipment safety.
- Avoid misoperation: Before debugging, you should carefully read the instructions of the digital pressure switch to understand its functions and usage to avoid operating errors that may cause damage to the equipment or malfunction.
- Pay attention to the environment: Avoid debugging in harsh environments such as high pressure, high temperature, and high humidity to avoid affecting the performance and measurement accuracy of the digital pressure switch.
- Regular inspection: During use, the working status of the digital pressure switch should be checked regularly to ensure its normal operation. If any abnormality is found, it should be handled and recorded in time.
- Professional maintenance: For non-professionals, do not try to disassemble or repair the digital pressure switch by yourself. If repair or replacement of parts is required, please contact the manufacturer or professional technicians for processing.
The debugging steps of digital pressure switch include preparation stage, parameter setting, wiring and inspection, testing and adjustment, and calibration and verification. During the debugging process, you need to pay attention to safety issues, avoid misoperation, pay attention to environmental factors, and conduct regular inspections and maintenance.
