PW221 High-Pressure Digital Switch | Industrial Hydraulics & Pneumatics
Engineered for extreme durability and high-pressure environments. The PW221 features a robust zinc alloy housing and high-resolution display, making it the ideal choice for heavy-duty hydraulic systems and process monitoring up to 1000 bar.
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High-Pressure Specialist: Reliable measurement ranges from vacuum up to 1000 bar.
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Dual-Use Functionality: Acts as both a pressure switch and a transmitter with simultaneous analog and switching outputs.
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Rugged Zinc Alloy Shell: Superior mechanical protection compared to standard plastic housings.
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270° Rotating Display: Flexible orientation for perfect visibility in complex hydraulic blocks.
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Premium Sensing Technology: Utilizes advanced ceramic or thin-film sensors for maximum long-term stability.
Description
The PW221 series is a high-performance solution for demanding gas-liquid dual-use applications. Whether it is used for pump control, leakage monitoring, or filter clogging detection, this sensor provides the high resolution and durability required by Swiss precision engineering standards.
Maximum Versatility in Control
The PW221 is more than just a switch; it is a complete pressure management interface. With the ability to output 1 or 2 switching signals (PNP/NPN) alongside a continuous 4-20mA analog signal, it provides the PLC with comprehensive data while maintaining local safety cut-offs.
Designed for Heavy-Duty Hydraulics
In hydraulic and pneumatic process control, space is often at a premium. The compact design, combined with the 270° free rotation of the shell, ensures that the PW221 fits into tight machine configurations without sacrificing usability. Its IP67 rating and NBR-sealed stainless steel process connections ensure a leak-free, long-service life even when exposed to aggressive hydraulic oils.
Features
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Robust Zinc Alloy Construction: The PW221 is built to withstand the physical demands of mechanical engineering. Its high-strength shell protects the internal electronics from impacts and harsh industrial environments.
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Precise High-Pressure Monitoring: Specifically designed for hydraulic power units and high-pressure gas systems, ensuring accuracy even at the upper limits of its 1000 bar range.
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Zero-Point & Span Adjustability: Easily calibrate the sensor on-site. The menu allows for precise adjustment of switching points, analog start/end points, and output logic without external tools.
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Vibration-Resistant M12 Connection: Equipped with a locking M12 connector (4-pin or 5-pin), ensuring signal integrity in high-vibration environments typical of pump stations and mobile hydraulics.
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Flexible Visual Orientation: The display housing can be rotated 270 degrees, allowing for vertical or horizontal mounting while keeping the LED display upright for the operator.
Specification
| Feature | Specification |
| Control Range | -1 bar … 0 … 1000 bar |
| Accuracy | ≤ ±0.5% F.S. |
| Switch Output | 1 or 2x PNP/NPN (Normally Open/Closed) |
| Analog Output | 4-20mA (Load ≤ 500Ω) |
| Display | Red 9mm LED, 4-digit (-999…9999) |
| Response Time | ≤ 30ms |
| Housing Material | Zinc Alloy |
| Wetted Parts | Stainless Steel + NBR Seal |
| Protection Class | IP67 |
| Supply Voltage | 12 … 30 VDC |
FAQ
1. Can the PW221 handle hydraulic pressure spikes? Yes. The PW221 is built for heavy-duty hydraulics. Its internal sensor technology is designed to handle rapid pressure fluctuations, and you can program a response delay (up to 30ms) to prevent “nuisance tripping” caused by momentary spikes.
2. What is the benefit of the Zinc Alloy housing over plastic? In mechanical engineering environments, sensors are often exposed to physical impacts, falling tools, or high vibration. The zinc alloy shell provides superior mechanical protection and better heat dissipation compared to standard plastic housings.
3. Is it possible to use the PW221 as both a switch and a transmitter? Absolutely. The PW221 is a “dual-use” device. It can provide a continuous 4-20mA analog signal to your PLC for monitoring, while simultaneously using its two switching outputs to trigger local safety alarms or shut down a pump.
4. How does the 270° rotation help during installation? In tight hydraulic blocks, the pressure port might face a direction that makes the screen invisible. The 270° rotating shell allows you to tighten the process connection first and then rotate the display head so the operator can read it clearly.
