YOKOGAWA PW301

Description

YOKOGAWA PW301 is a digital panel meter or digital indicator designed for the precise display of process variables such as temperature, pressure, flow, or level. This instrument from Yokogawa serves as a reliable and clear local readout device, accepting standard analog input signals and displaying the value on a bright digital display. It is commonly used for operator observation, local monitoring, and verification alongside control systems. Detailed technical information can be found on the product page: YOKOGAWA PW301. The YOKOGAWA PW301 provides a trusted, standalone solution for accurate process visualization at the point of measurement or control.

Product Description

The YOKOGAWA PW301 is a compact, panel-mounted digital indicator. Its primary function is to receive an analog input signal—typically a 4-20 mA current loop, a 1-5 V DC voltage, or signals from specific temperature sensors like thermocouples (TC) or resistance temperature detectors (RTD)—and convert it into a numerical value displayed on its digital screen. The PW301 performs necessary linearization (for TCs and RTDs) and scaling, allowing the display to read directly in engineering units (e.g., °C, psi, m³/h). It features a clear LED or LCD display, often with multiple digits and possibly a bargraph. The device is designed for easy integration into control panels, providing a cost-effective and focused solution for situations where a local display is required but full control functionality is not.

Product Parameters

• Brand and Manufacturer: YOKOGAWA.
• Product Type: Digital Panel Meter, Digital Indicator.
• Input Signals: Universal or selectable input types. Common options include:
  • DC Current: 4-20 mA (most common)
  • DC Voltage: 0-5V, 1-5V, etc.
  • Thermocouples: Types J, K, T, E, etc.
  • RTDs: Pt100 (2-wire, 3-wire)
• Display: 4 to 6-digit LED or LCD display, often with a sign and decimal point.
• Display Range: The numerical range is determined by the input type and user-configured scaling.
• Accuracy: High accuracy typical for display instruments (e.g., ±0.2% of reading +1 digit).
• Scaling Function: Allows user to set the display value corresponding to the 4 mA and 20 mA points (e.g., 0 psi at 4 mA, 100 psi at 20 mA).
• Power Supply: Requires an external power source, typically 24V DC, 100-240V AC, or loop-powered (for 4-20 mA input versions).
• Mounting: Standard panel cutout mounting (e.g., 1/8 DIN, 1/16 DIN, or a specific rectangular cutout).
• Housing: Plastic or metal case designed for industrial environments.

Advantages and Features

The main advantage of the YOKOGAWA PW301 is its simplicity, reliability, and excellent readability from a brand known for measurement precision. It offers a straightforward, maintenance-free way to add a local display. Key features include easy front-panel or internal configuration for input type and scaling, eliminating the need for complex programming. Its high-brightness display ensures visibility from a distance and in various lighting conditions. The PW301 is designed for robust operation with high noise immunity, making it suitable for installation in electrically noisy industrial panels. By choosing the YOKOGAWA PW301, users obtain a dedicated, accurate, and durable display device that complements any control loop.

Application Cases in Various Fields

• Local Pressure/Temperature Monitoring: Mounted on a skid or machine panel to display the output of a pressure transmitter or temperature sensor for operator rounds.
• Flow Totalization: Used as a local flow rate indicator where a flow transmitter’s 4-20 mA signal is connected to the PW301 for direct viewing in gallons per minute or liters per second.
• Tank Level Indication: Providing a local digital readout of level from a level transmitter’s signal in storage tank farms or process vessels.
• Auxiliary Display for Controllers: Serving as a secondary, dedicated display for a critical process variable next to a controller, enhancing operator situational awareness.
• Test and Calibration Benches: Used as a precise readout device for calibrating transmitters or sensors by displaying the standard’s output signal.

Comparison with Competing Products

Compared to other digital panel meters from manufacturers like OMRON, Red Lion, PR Electronics, or Autonics, the YOKOGAWA PW301 is recognized for its high quality, durability, and measurement integrity associated with the Yokogawa brand. While competitors may offer a wider variety of form factors, communication options, or advanced features like dual displays or alarms, the PW301 excels as a solid, no-frills, highly reliable indicator. It is often perceived as a premium choice for critical display points where accuracy and long-term stability are valued over extra features. For basic indication needs, it competes favorably on quality, though sometimes at a slightly higher price point than generic brands.

Selection Suggestions and Precautions

1. Define Input Signal and Type: Precisely identify the sensor or transmitter output signal (e.g., 4-20 mA, Type K thermocouple) to select the correct PW301 model variant.
2. Choose Power Supply Mode: Decide if you need a line-powered unit (AC or DC) or a loop-powered version that draws power from the 4-20 mA signal itself (simpler wiring but has voltage drop limitations).
3. Plan Display Scaling: Determine the desired display range. Ensure the PW301 model allows for sufficient scaling flexibility to map your 4-20 mA signal to the required engineering units (e.g., 0-150°C).
4. Verify Cutout Dimensions: Check the panel cutout size required for the specific PW301 model to ensure it fits your existing or planned panel design.
5. Consider Environment: For outdoor or washdown areas, ensure the model has an appropriate ingress protection (IP) rating (e.g., IP65).

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