Description

YOKOGAWA PW482-50 — High-Precision Analog Input Module for Industrial Process Control

Product Description

Technical Specifications

• Brand: Yokogawa
• Model: YOKOGAWA PW482-50
• Product Type: Analog Input Module (Industrial DCS/SIS)
• Number of Channels: 8 independent, isolated channels
• Supported Signal Types:
  • Current: 4–20 mA (2-wire/4-wire), 0–20 mA
  • Voltage: 0–10 V, ±10 V, 0–5 V
  • Thermocouple: J, K, T, E, R, S, B, N, L, U, PLII
  • RTD: Pt100, Pt1000, Cu50, Ni100 (2-wire/3-wire/4-wire)
• Measurement Accuracy: ≤±0.02% FS (at 23°C ±5°C)
• Resolution: 16-bit ADC
• Sampling Rate: 10 samples/second per channel (configurable up to 100 samples/second)
• Noise Filtering: Digital low-pass filter (configurable cutoff frequency: 0.1–10 Hz)
• Surge Protection: ±250 VAC for 1 second (per channel)
• Isolation: Channel-to-channel, channel-to-ground (250 VAC rms for 1 minute)
• Diagnostic Functions: Open circuit detection, short circuit detection, overrange/underrange alert, module self-test
• Host Interface: Vnet/IP (compatible with Yokogawa CENTUM VP DCS/ProSafe-RS SIS)
• Power Supply: 24 VDC (±10%), Power Consumption ≤ 12 W
• Operating Temperature: -20°C to +60°C
• Storage Temperature: -40°C to +85°C
• Protection Rating: IP20
• Housing Material: Aluminum alloy
• Mounting Type: Rack-mounted (Yokogawa standard DCS rack)
• Dimensions (L×W×H): 180 mm × 120 mm × 80 mm
• Weight: Approximately 0.8 kg
• Compatibility: Yokogawa CENTUM VP DCS, ProSafe-RS SIS, field sensors/transmitters (4–20 mA, thermocouple, RTD)
• Certifications: CE, UL, CSA, ATEX (Zone 2/22), IECEx, FM, RoHS

Advantages and Features

• Exceptional Accuracy: ≤±0.02% FS measurement precision for critical process control.
• Multi-Signal Support: Configurable channels for current, voltage, thermocouple, and RTD signals.
• Robust Protection: Surge protection and noise filtering for reliable operation in harsh environments.
• Advanced Diagnostics: Real-time fault detection and alerts to minimize downtime.
• Seamless Yokogawa Integration: Plug-and-play compatibility with CENTUM VP DCS and ProSafe-RS SIS.
• Hot Swapping: Maintenance/replacement without system shutdown.
• Isolated Channels: Prevent cross-talk and ensure signal integrity.

Application Fields and Case Studies

• Oil & Gas Industry: A major onshore oil refinery integrated YOKOGAWA PW482-50 into its CENTUM VP DCS to monitor temperature and pressure in distillation columns. The module’s high accuracy and thermocouple/RTD support enabled precise measurement of process conditions, while its diagnostic functions detected a faulty pressure transmitter cable, preventing a potential process upset and ensuring product quality.
• Chemical Industry: A large petrochemical plant used YOKOGAWA PW482-50 in its ProSafe-RS SIS to collect 4–20 mA signals from gas detectors and level transmitters in a hazardous area. The module’s surge protection and isolation features withstood EMI from nearby pumps and motors, ensuring reliable data transmission for emergency shutdown logic, compliant with SIL 3 safety requirements.
• Pharmaceutical Industry: A biopharmaceutical facility deployed YOKOGAWA PW482-50 to monitor temperature and pH levels in fermentation tanks. The module’s exceptional accuracy and calibration stability met FDA requirements for process validation, while its hot-swapping capability allowed for maintenance during batch production without interrupting operations.
• Power Generation Industry: A combined-cycle power plant utilized YOKOGAWA PW482-50 to measure steam temperature, pressure, and flow in gas turbines. The module’s high sampling rate and noise filtering ensured real-time data for turbine control, optimizing efficiency and preventing equipment damage from over-temperature conditions.

Comparison with Competitors

Selection Recommendations and Precautions

Selection Recommendations

Precautions

1. When installing YOKOGAWA PW482-50, use shielded cables for sensor connections to minimize EMI. Ensure proper grounding of the module and cables to maintain signal integrity.
2. Calibrate the module using Yokogawa’s official calibration tools and follow the recommended calibration schedule (annually for critical applications) to maintain accuracy.
3. Configure channel parameters (signal type, range, filter settings) via Yokogawa’s Engineering Environment software to match the connected sensors. Mismatched settings will cause measurement errors.
4. Do not exceed the module’s operating temperature range (-20°C to +60°C) or surge protection limits. Install the module in a well-ventilated rack to avoid overheating.
5. Use only genuine Yokogawa spare parts and accessories. Non-genuine components may compromise performance, safety, and compatibility.

Maintenance

• Routine Checks: Conduct quarterly inspections of the module’s status indicators, cable connections, and rack mounting. Clean dust from the module using compressed air (low pressure) to ensure proper heat dissipation.
• Calibration: Calibrate the module annually (or semi-annually for high-precision applications) using Yokogawa’s calibrated reference equipment to maintain measurement accuracy.
• Firmware Updates: Check for firmware updates via Yokogawa’s Support Center and install them to access new features and bug fixes.
• Troubleshooting: Use the module’s diagnostic functions and DCS/SIS software to identify faults. Replace faulty channels or the entire module if diagnostics indicate hardware failure.
• Spare Parts: For critical applications, keep a spare YOKOGAWA PW482-50 on hand to minimize downtime in case of module failure.