PW440 Multi-Relay Pressure Controller | 5 Switch Points & Analog Output
The ultimate command center for pressure automation. The PW440 series offers unparalleled control flexibility with up to 5 independent relay outputs and a high-precision 5-digit display, designed for complex industrial monitoring and multi-pump management.
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Maximum Control: Features 5 independent relay switches for sophisticated process automation.
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Dual Signal Processing: Simultaneous high-accuracy analog output (4-20mA) and multi-point switching.
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Precision Display: Large 5-digit LED screen for real-time monitoring of even the smallest pressure fluctuations.
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Versatile Powering: Supports a wide input voltage range (AC/DC 85-265V or 24V DC).
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Industrial Durability: Designed to handle vacuum to high-pressure (100 MPa) with 0.1% or 0.2% FS accuracy.
Description
The PW440 Digital Pressure Controller is a high-integration device that combines measurement, display, and multi-point control into a single robust unit. In many applications, the PW440 can replace a combination of several individual switches and a simple PLC, significantly reducing wiring complexity and cabinet space.
Designed for Complex Automation
Where standard pressure switches reach their limits, the PW440 thrives. It is the preferred choice for intelligent pump stations, hydraulic power units, and chemical process lines where multiple pressure thresholds must be monitored simultaneously. Each of its 5 relays can be configured independently, providing a level of redundancy and control logic rarely found in a compact instrument.
Reliability in Every Environment
With an accuracy of up to 0.1% FS, the PW440 is built for precision. Its robust electronics are shielded against electromagnetic interference, ensuring stable operation even near high-power motors or in demanding industrial environments. The combination of its intuitive menu and versatile mounting options makes it the most flexible “all-in-one” pressure solution in the Longvista portfolio.
Features
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5-Relay Logic Control: The standout feature of the PW440 is its 5 independent relay outputs. This allows for complex “stepped” control, such as managing a cascade of multiple pumps or triggering different alarm levels (Low, High, Critical).
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High-Resolution Monitoring: Equipped with a 5-digit high-brightness LED display, it provides a clear reading of pressure values from -9999 to 99999, making it suitable for applications requiring extreme granularity.
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Integrated Signal Transmitter: Beyond switching, the PW440 acts as a high-grade transmitter, providing a stabilized analog signal (4-20mA or 0-10V) for remote monitoring systems.
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Universal Power Compatibility: Its flexible power architecture makes it suitable for various global standards, whether integrated into a 24V DC control cabinet or connected directly to AC mains (85-265V).
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Advanced Customization: Users can program hysteresis, delay times, and zero-point calibration directly via the front panel keys, allowing for immediate on-site optimization.
Specification
| Feature | Specification |
| Pressure Range | -0.1 MPa … 0 … 100 MPa |
| Accuracy | 0.1% / 0.2% / 0.5% FS |
| Switch Output | Up to 5 Sets of Relays (250V/3A) |
| Analog Output | 4-20mA / 0-5V / 0-10V |
| Display | 0.56″ 5-digit LED (-9999 ~ 99999) |
| Power Supply | AC/DC 85-265V or 24V DC |
| Response Time | ≤ 20ms |
| Load Capacity | 220V 3A / 24V 5A |
| Ambient Temp. | -20°C to +70°C |
| Wetted Parts | Stainless Steel 304 / 316L |
FAQ
1. Why does the PW440 have 5 relays instead of the standard 2? The 5 relays allow for complex multi-stage automation. For example, in a water supply system, you can use Relay 1 for “Low Pressure Alarm,” Relays 2 and 3 for “Pump 1 & 2 Startup,” Relay 4 for “High Pressure Cut-off,” and Relay 5 for “Critical Emergency Shutdown.” This eliminates the need for a separate PLC for simple logic.
2. Can the PW440 handle both AC and DC power? Yes. One of the most flexible features of the PW440 is its wide-range power supply. We offer versions that support AC/DC 85-265V, making it compatible with global power grids, as well as a standard 24V DC version for low-voltage control cabinets.
3. Is the analog output isolated from the switching outputs? Yes, the PW440 is designed with industrial-grade signal conditioning to ensure that the 4-20mA analog signal remains stable and accurate, even while the high-capacity relays are switching inductive loads like motors or valves.
4. How difficult is it to program the 5 different setpoints? The interface is remarkably intuitive. Using the three front-panel keys, you can navigate a structured menu to set individual setpoints, hysteresis (return difference), and delay times for each of the five relays independently. No external software is required.
5. What is the benefit of the 5-digit display over a 4-digit one? A 5-digit display offers much higher granularity. For high-pressure applications (e.g., up to 1000 bar) or very low-pressure vacuum monitoring, the extra digit allows you to see fluctuations as small as 0.01 bar or 0.001 MPa, providing better diagnostic data for your process.
