YOKOGAWA PW701

Description

YOKOGAWA PW701 — Single-Loop Programmable Indicating Controller

Product Description: YOKOGAWA PW701

YOKOGAWA PW701 is a compact, single-loop programmable indicating controller from Yokogawa Electric Corporation’s UTAdvanced series. This device integrates the functions of a controller, indicator, and recorder into a single, space-saving unit, making it an ideal solution for simple process control loops and standalone monitoring applications. The YOKOGAWA PW701 is designed to receive inputs from various sensors (such as thermocouples, RTDs, and DC voltage/current signals), execute control algorithms (primarily PID), and output control signals to final elements like valves or actuators. Its prominent feature is a large, easy-to-read digital display that shows the process variable (PV), setpoint (SP), and output value simultaneously.

Product Parameters

• Type: Single-Loop Programmable Indicating Controller.

• Input Signals: Universal input accepting thermocouples (Types J, K, T, E, R, S, B, N, etc.), RTDs (Pt100, JPt100), DC voltage (mV, V), and DC current (4-20 mA).

• Control Output: Options include relay contact, voltage pulse, current (4-20 mA), or SSR drive.

• Control Algorithm: Advanced PID control with functions like auto-tuning, cascade, and ratio control.

• Display: Large, high-brightness LED or LCD digital display for PV, SP, and output.

• Communication: Optional communications (e.g., RS-485 Modbus) for integration with host systems or SCADA.

• Auxiliary Outputs: Can include transmit output (e.g., 4-20 mA retransmission of PV) and alarm outputs (up to 4 points).

• Power Supply: Typically 100-240 VAC or 24 VDC.

• Mounting: Panel-mounted instrument (cut-out size).

Advantages and Features

1. All-in-One Simplicity: The YOKOGAWA PW701 combines indication, control, and basic recording/ alarming in one device, reducing panel space, wiring complexity, and overall system cost for single-loop applications.

2. High Visibility and Operability: The large, clear digital display allows for easy monitoring from a distance. Front-panel buttons provide intuitive access for setting parameters and manual control.

3. Flexibility and Versatility: Its universal input accepts a wide range of sensor types, eliminating the need for specific signal converters. The variety of available output types allows it to interface with different actuators.

4. Reliability and Yokogawa Quality: Built with Yokogawa’s industrial-grade components, the PW701 is known for its high reliability, stability, and long-term measurement accuracy.

5. Standalone Operation: It functions completely independently without needing a central PLC or DCS, making it perfect for small processes, equipment modernization, or as a backup/local controller in larger systems.

Application Cases in Various Fields

• Industrial Furnaces and Ovens: Precise temperature control for heat treatment, drying, and baking processes.

• HVAC and Building Management: Control of temperature and humidity in critical environments like server rooms, cleanrooms, or museums.

• Packaging Machinery: Temperature control on sealing bars or glue applicators.

• Water and Wastewater Treatment: Control of pH, chlorine level, or tank level in smaller treatment units or sampling stations.

• Food and Beverage Processing: Temperature control for pasteurization, fermentation tanks, or cooking vats.

• Plastics Processing: Barrel temperature control on smaller extruders or injection molding machines.

Comparisons with Competing Products

Direct competitors include single-loop controllers from Omron (ESCN Series), Fuji Electric (PXR/PXG Series), ABB (CTRK Series), and Eurotherm (Mini 8). The YOKOGAWA PW701 competes strongly based on Yokogawa’s brand reputation for precision instrumentation and robustness in industrial environments. It often excels in display readability and long-term stability. Some competitors may offer a lower initial cost or more modern communication options as standard, but the PW701 remains a trusted choice for core control reliability.

Selection Suggestions and Precautions

1. Define Input/Output Requirements: Precisely identify the sensor type (e.g., K-type thermocouple, 4-20 mA) and the required control output type (relay for heater, 4-20 mA for valve) to select the correct model variant of the PW701.

2. Consider Communication Needs: If integration with a data logger, SCADA, or PLC is required, ensure you specify the optional communication module (e.g., RS-485) when ordering the YOKOGAWA PW701.

3. Plan for Alarms: Determine how many alarm setpoints are needed (e.g., high, low, deviation) and ensure the selected configuration has a sufficient number of alarm relay outputs.

4. Proper Installation and Wiring: Follow the manual for correct wiring, especially for thermocouples (using compensating wire) and RTDs. Ensure proper separation from power lines to avoid noise interference on analog signals.

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