ISE20B-V-P-N01-WB-X500: SMC ISE20B Series 3-Screen High-Precision Digital Pressure Switch (for Positive Pressure, PNP 1 Output + Analog Voltage Output, R1/8 Port, with Connector Cable, Cable Length 3 m)

The ISE20B-V-P-N01-WB-X500 is a model from SMC Corporation Japan’s ISE20B series of 3-screen, high-precision digital pressure switches. It has a rated pressure range of -0.1 to 1 MPa, features a PNP open collector 1 output and an analog voltage output, comes with an R1/8 port, and includes a connector cable (3 m length). It is suitable for pressure monitoring, alarm, and control in applications such as industrial automation, pneumatic systems, and hydraulic systems.

I. Model Number Interpretation (According to SMC ISE20B Series Naming Rules)

• ISE20B:​ ISE20B Series 3-screen high-precision digital pressure switch, 2 outputs + analog output (voltage/current), for positive pressure.
• V:​ Output specification code. V indicates PNP open collector 1 output + analog voltage output.
• P:​ Unit specification code. P indicates unit switching function (kPa/MPa switching).
• N01:​ Port specification code. N01 indicates an R1/8 port.
• W:​ Option 1 code. W indicates a connector cable (cable length 2 m, 5-conductor, with waterproof cover).
• B:​ Option 2 code. B indicates a mounting bracket (Bracket B).
• X500:​ Custom specification code. X500 indicates a 3 m cable length.

II. Main Technical Specifications

Parameter	Specification	Description
Series​	ISE20B	3-screen high-precision digital pressure switch, 2 outputs + analog output (voltage/current), for positive pressure.
Rated Pressure Range​	-0.1 to 1 MPa	Detectable pressure range, includes negative and positive pressure.
Set Pressure Range​	-0.105 to 1.05 MPa	Adjustable set pressure range, slightly wider than the rated range.
Proof Pressure​	1.5 MPa	Pressure test rating for verifying product pressure resistance.
Applicable Fluid​	Air / Non-corrosive gas / Non-flammable gas	Suitable working media.
Supply Voltage​	DC12 to 24 V ±10%	Operating power supply voltage range.
Current Consumption​	35 mA max.	Maximum current consumption.
Display Accuracy​	±2% F.S. ±1 digit	Accuracy of the displayed value.
Repeatability​	±0.2% F.S. ±1 digit	Accuracy during repeated measurements.
Analog Voltage Output​	0.6 to 5 V	Analog voltage output range.
Maximum Load Current​	80 mA	Maximum load current for output terminals.
Maximum Applied Voltage​	28 V	Maximum applied voltage for output terminals.
Hysteresis Mode​	Adjustable	Hysteresis (differential) can be set.
Upper/Lower Limit Comparison Mode​	Adjustable	Upper and lower limit comparison modes can be set.
Display Type​	LED	Digital display method.
Number of Screens​	Three-screen display	Can display multiple parameters simultaneously.
Operating Temperature Range​	-5 to 50 °C	Ambient temperature range for operation.
Storage Temperature Range​	-10 to 60 °C	Ambient temperature range for storage.
Operating Humidity Range​	35 to 85% RH	Ambient humidity range for operation.
Protection Class​	IP65	Ingress Protection rating, dust-tight and protected against water jets.
Port Size​	R1/8	Port thread specification.
Cable Specification​	Connector cable, 3 m length, 5-conductor, with waterproof cover	Electrical connection method.

III. Structure and Working Principle

1. Structural Composition

The ISE20B-V-P-N01-WB-X500 adopts a digital pressure switch structure, primarily consisting of:

• Pressure Sensor:​ A high-precision pressure sensor detects system pressure.
• Microprocessor:​ Amplifies, processes, and calculates the pressure signal for high-precision measurement and control.
• LED Display:​ Three-screen LED display shows current pressure value, set value, and status information simultaneously.
• Operation Keys:​ Used to set parameters like pressure threshold, hysteresis, and upper/lower limit comparison modes.
• Output Circuit:​ PNP open collector 1 output + analog voltage output for controlling external devices or PLCs.
• Port:​ R1/8 threaded port for easy connection to piping.
• Housing:​ Resin + metal structure with IP65 protection rating, dust-tight and protected against water jets.

2. Working Principle

The ISE20B-V-P-N01-WB-X500 operates based on digital pressure switch principles:

• Pressure Detection:​ The pressure sensor detects system pressure and converts it into an electrical signal.
• Signal Processing:​ The microprocessor amplifies, filters, and calculates the electrical signal to obtain a high-precision pressure value.
• Display and Setting:​ The LED display shows the current and set pressure values. Operation keys are used to set the pressure threshold, hysteresis, upper/lower limit comparison modes, etc.
• Output Control:​ When the pressure reaches the set value, the PNP output activates, and the analog voltage output provides a corresponding voltage signal for controlling external devices or PLCs.

IV. Features

• High-Precision Measurement:​ Display accuracy ±2% F.S. ±1 digit, repeatability ±0.2% F.S. ±1 digit, suitable for high-precision monitoring and control.
• Three-Screen Display:​ Simultaneously displays current pressure, set value, and status information, facilitating on-site monitoring and debugging.
• PNP Output + Analog Voltage Output:​ PNP open collector 1 output + analog voltage output compatible with PLCs, relays, and other control devices.
• Unit Switching Function:​ Allows switching the display unit between kPa and MPa for convenience in different applications.
• Adjustable Hysteresis:​ Hysteresis (differential) can be set to prevent output oscillation due to pressure fluctuations.
• Upper/Lower Limit Comparison Modes:​ Allows setting upper and lower limit comparison modes for pressure alarms and control.
• IP65 Protection Rating:​ Dust-tight and protected against water jets, suitable for harsh industrial environments.
• Connector Cable:​ Includes a 3 m, 5-conductor cable with a waterproof cover, facilitating electrical connection and maintenance.

V. Typical Application Scenarios

• Pneumatic Systems:​ Monitors, alarms, and controls pressure in air compressors, pneumatic actuators, etc., ensuring stable air supply pressure.
• Hydraulic Systems:​ Monitors and protects pressure in hydraulic pumps, cylinders, etc., preventing overpressure or underpressure.
• Industrial Automation:​ Monitors and controls pressure in automated production lines, robots, testing equipment, etc., improving production efficiency and safety.
• Water Treatment Equipment:​ Monitors and controls pressure in pumps and water treatment systems, ensuring normal operation.
• Refrigeration Systems:​ Monitors refrigerant pressure to prevent system faults due to overpressure or underpressure.

VI. Installation and Usage Precautions

• Mounting Location:​ Install the pressure switch at a location that accurately reflects system pressure. Avoid areas with pipe bends, branches, or vortices. For gas, install at the top of the line to avoid liquid accumulation; for liquids, install on the side to avoid air bubbles.
• Piping Connection:​ Ensure fluid flow direction matches the arrow on the switch. Use thread seal tape or sealant. The port is R1/8; ensure thread compatibility.
• Electrical Wiring:​ Supply voltage is DC12-24V ±10%. Observe polarity and voltage range to avoid overvoltage or reverse connection. When connecting PNP and analog voltage outputs, observe load current and voltage limits. The 3 m connector cable facilitates connection.
• Parameter Setting:​ Use the operation keys to set pressure threshold, hysteresis, comparison modes, etc., and save the settings. Hysteresis should be set larger than the pressure fluctuation amplitude to prevent output chattering.
• Maintenance & Inspection:​ Periodically check for leaks at the switch and connections (e.g., using soap solution). Regularly verify display accuracy and calibrate if necessary. If malfunction occurs, first check power supply, piping, and wiring. Clean or replace the sensor if needed.

VII. Selection and Alternative Suggestions

• For different outputs, select other ISE20B models, e.g., ISE20B-R-01-W (NPN open collector 2 outputs + analog voltage), ISE20B-S-01-W (NPN open collector 2 outputs + analog current), ISE20B-Y-01-W (PNP open collector 2 outputs).
• For different port sizes, consider ISE20B-V-P-M5-WB-X500 (M5 port).
• For different cable lengths, consider ISE20B-V-P-N01-W-X500 (2 m cable).

Summary:​ The ISE20B-V-P-N01-WB-X500 is a high-precision, highly reliable digital pressure switch. Its design, featuring “3-screen display + PNP output + analog voltage output + unit switching + IP65 protection + connector cable (3 m),” provides precise and reliable pressure monitoring and control for industrial automation systems. It is an ideal choice for pneumatic systems, hydraulic systems, industrial automation, and similar applications.

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