ZSE20-N-01-LB: SMC High-Precision Digital Pressure Switch, the Expert in Precision Pressure Monitoring for Industrial Automation

ZSE20-N-01-LB is a high-precision digital pressure switch produced by SMC Corporation of Japan, belonging to the ZSE20 series. This pressure switch features a 3-screen display design, with characteristics such as high precision, fast response, and low power consumption. It is widely used in industrial automation control systems, providing reliable monitoring and control solutions for vacuum and compound pressure applications.

Core Product Advantages

1. 3-Screen High-Precision Display Utilizes a 3-screen LED display design. The main screen displays red/green, and the sub-screen displays orange. It can simultaneously show the set value, measured value, and status information, facilitating on-site monitoring and debugging. The display accuracy reaches ±2%F.S.±1digit, with a repeatability accuracy of ±0.2%F.S.±1digit, ensuring measurement accuracy and reliability.
2. Fast Response Performance Delay time can be as fast as 1.5ms or less. Its quick response speed enables timely detection of pressure changes and output of control signals, meeting the demands of high-frequency switching in industrial control.
3. Low-Power Design The consumption current is only 25mA or less, saving energy and being environmentally friendly, while also reducing heat generation and extending equipment lifespan.
4. Simple 3-Step Setting Setting items are visualized. Pressure setting can be completed through a simple 3-step operation. Screen switching is straightforward, allowing for observation of measured values during setting, making operation convenient.

Technical Parameters

Parameter Item	Specification Value	Explanation
Series	ZSE20 Series	Product Series
Rated Pressure Range	0 ~ -101 kPa	Vacuum Pressure Range
Set Pressure Range	10 ~ -105 kPa	Adjustable Range
Maximum Operating Pressure	500 kPa	Maximum Working Pressure
Output Specification	NPN Open Collector, 1 output	Output Mode
Power Supply Voltage	DC 12 ~ 24V ±10%	Supply Voltage
Consumption Current	25 mA or less	Power Consumption
Display Accuracy	±2% F.S. ±1 digit	Measurement Accuracy
Repeatability Accuracy	±0.2% F.S. ±1 digit	Repeatability
Working Fluid	Air / Non-corrosive gas / Non-flammable gas	Operating Medium
Ambient Temperature	-5 ~ 50 °C	Operating Temperature Range
Port Size	R1/8	Air Port Interface
Protection Rating	IP40	Ingress Protection Rating
Display Type	LED	Display Method
Display Digits	Main Screen: 4-digit 7-segment, Sub-screen: 4-digit	Number of Display Digits

Model Number Breakdown

• ZSE20: SMC High-Precision Digital Pressure Switch Series Code
• N: Output Specification, NPN Open Collector, 1 output
• 01: Port Specification, R1/8 Interface
• L: With Plug Connector (Cable length 2m)
• B: Unit Specification, with Unit Switching Function

Working Principle

The ZSE20-N-01-LB employs an electronic pressure detection principle. When the system pressure is higher or lower than the rated safety pressure, the diaphragm inside the sensor instantly moves, pushing the switch contact to connect or disconnect via the connecting lever. When the pressure drops or rises to the rated reset value, the diaphragm instantly resets, and the switch automatically resets. In simple terms, when the measured pressure exceeds the rated value, the free end of the elastic element produces displacement, directly or after comparison, pushing the switching element to change its on/off state, achieving the purpose of controlling the measured pressure.

The elastic elements used in the pressure switch include single-turn Bourdon tubes, diaphragms, capsule diaphragms, and bellows. A high-precision instrumentation amplifier amplifies the pressure signal, which is then acquired and processed by a high-speed MCU. A built-in precision sensor provides compensation, enabling accurate monitoring and control of pressure.

Typical Application Scenarios

1. Industrial Automation Production Lines In automated production lines for automotive manufacturing, electronic equipment production, etc., used to monitor the vacuum pressure status of pneumatic systems. It provides timely alarms for abnormal pressure, preventing equipment damage and ensuring safe operation.
2. Vacuum Systems In equipment such as vacuum packaging, vacuum suction, and vacuum handling, used to monitor vacuum levels. It outputs a signal when the set vacuum level is reached, controlling the start/stop of the vacuum pump to ensure stable system operation.
3. Medical Equipment In medical equipment, used to monitor and control blood pressure, oxygen concentration, drug infusion, etc., ensuring the safety and efficacy of medical devices.
4. Aerospace Field In the aerospace field, used to monitor the pressure status of aircraft hydraulic and pneumatic systems, achieving precise pressure control to ensure flight safety.

Installation and Usage Precautions

1. Installation Requirements The pressure switch should be installed vertically on horizontal piping to ensure stable operation. Before installation, check that the air source pressure meets the 0 ~ -101 kPa requirement and ensure the air source is clean. During installation, note that the arrow on the valve body should match the medium flow direction; it must not be installed in reverse.
2. Operating Environment The operating temperature range is -5 ~ 50°C. Avoid use in extremely high or low-temperature environments. Relative humidity should be maintained between 35~85%RH. Avoid humid environments affecting equipment life. The working medium should be filtered through a 40μm or larger filter element before use.
3. Piping Connection Before piping, thoroughly blow or clean out cutting powder, cutting oil, dust, etc., inside the pipes. When using threaded connections for piping and fittings, prevent chips from the threaded part and fragments of sealing tape from entering the piping interior. When using sealing tape, leave 1.5-2 pitch lengths at the thread end without tape.
4. Electrical Connection Connect wiring strictly according to the voltage parameters on the nameplate (power supply voltage DC12~24V ±10%). Ensure a stable power supply. When connecting wires, confirm secure connections to prevent loosening causing switch failure. It is recommended to install an overload protection device in the circuit.
5. Parameter Setting Set pressure thresholds, response time, and other parameters via the front panel keys. Set values should not be lower than factory settings to avoid the switch failing to reset properly. After adjustment, check if the switch operates correctly.
6. Regular Maintenance Regularly inspect the connecting piping of the pressure switch to ensure no leakage. Clean the display panel periodically to maintain cleanliness. Regularly check the operational performance of the pressure switch to ensure long-term stable operation. Before reuse after prolonged shutdown, perform a venting/flushing operation is recommended.
7. Safe Operation Ensure the equipment is properly grounded before operation to prevent electric shock risk. Avoid contact with moving parts during operation to prevent pinching. In case of equipment failure, stop immediately for repair by qualified personnel. Before installation, depressurize to prevent high-pressure medium ejection causing injury. Strictly prohibit use beyond the product’s rated pressure, temperature, and medium range.

Operation Instructions

1. Setting Control Pressure (1) Briefly press the (ON/OFF) run key to turn off the run indicator, closing the pressure control system. (2) Set the control upper/lower limit: Briefly press the SET key once to enter the lower limit setting state (corresponding lower limit indicator lights up). Use the increase/decrease keys to set the value. After setting the lower limit, briefly press the SET key to enter the upper limit setting, following the same method. (3) After setting, press the SET key to automatically save the set value to the onboard chip (if no key operation occurs within 5 seconds after parameter modification, the current parameter settings are automatically saved). (4) Press the (ON/OFF) run key again (corresponding run indicator lights up) to start the motor operation.
2. Unit Switching Method Briefly press the (ON/OFF) run key to turn off the run indicator. Briefly press the increase key to switch the unit between MPa, Kg/cm², and PSI arbitrarily. After setting, turn on the run indicator.
3. Zero Clear Function Briefly press the (ON/OFF) run key to turn off the run indicator. Press and hold the decrease key for 5 seconds to clear the current pressure value, correcting zero-point error. After setting, turn on the run indicator. (Do not apply pressure to the pressure switch when using this function).

Conclusion

The ZSE20-N-01-LB high-precision digital pressure switch is the “expert in precision pressure monitoring” in the field of industrial automation. It perfectly combines a 3-screen display, fast response, low power consumption, and high-precision measurement, providing efficient, reliable, and intelligent pressure monitoring and control solutions for various industrial applications.

Choosing the ZSE20-N-01-LB means choosing to drive your automation system towards higher efficiency with high precision and high reliability!

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