The Woodward 8901-457 is an advanced current-to-pressure converter from the CPC-II series, featuring enhanced dynamic response for demanding industrial control applications. This high-performance 8901-457 model converts precise 4-20mA electrical signals to proportional 3-15psi pneumatic outputs with exceptional speed and accuracy. Designed for critical process control systems, the 8901-457 delivers superior performance in applications requiring fast response times and stable output. Its robust construction and advanced signal processing make the 8901-457 ideal for integration with modern DCS and PLC systems where reliable signal conversion is essential.
Technical Specifications
Product Model | 8901-457
Manufacturer | Woodward
Product Type | CPC-II Current-to-Pressure Converter with Enhanced Dynamics
Input Signal | 4-20mA DC (2-wire)
Output Pressure | 3-15psi (0.2-1.0 bar)
Response Time | <100ms (90% of span)
Accuracy | ±0.25% of span
Linearity | ±0.1% of span
Supply Pressure | 20-30psi (1.4-2.1 bar)
Operating Temperature | -40°C to +85°C
Housing | Aluminum with corrosion-resistant finish
Weight | 2.5kg
Mounting Options | Panel or DIN rail
Certifications | ATEX, IECEx, CE
Key Features and Advantages
The Woodward 8901-457 stands out with its enhanced dynamic response capability, making it particularly suitable for fast-acting control loops. Its precision-machined components ensure minimal hysteresis and excellent repeatability under varying operating conditions. The 8901-457 features advanced temperature compensation that maintains accuracy across the full operating temperature range. With its patented flapper-nozzle design, the converter provides smooth, stable output even with fluctuating supply pressures. The unit’s field-adjustable zero and span settings simplify calibration and reduce commissioning time.
Application Fields
The Woodward 8901-457 excels in applications requiring rapid pneumatic response to electronic control signals. In power generation, it’s used for precise fuel valve control in gas turbines. Petrochemical plants utilize the 8901-457 for critical pressure regulation in catalytic cracking units. Its fast response makes it ideal for compressor anti-surge control systems in oil and gas applications. The converter also finds use in pharmaceutical manufacturing where precise pneumatic control is required for bioreactor systems. Its robust design performs reliably in marine applications subject to vibration and harsh environments.
Related Products
- Woodward 9907-1200 CPC-II series current-pressure converters
- 8901-458 – Explosion-proof variant
- 8901-459 – High-temperature version
- 8901-460 – Compact DIN rail mount
- 8901-461 – Multi-input version
Installation and Maintenance
Installation preparation: When installing the Woodward 8901-457, ensure clean, dry instrument air supply with proper filtration. Verify adequate space for maintenance access and proper grounding of the unit. All pneumatic connections should use appropriate thread sealant.
Maintenance recommendations: Regular inspection of the 8901-457 should include checking for air leaks and verifying calibration. Annual recalibration is recommended, or more frequently in critical applications. Monitor the air filter and replace when pressure drop exceeds specifications. Keep the unit clean and protect from excessive moisture.
Product Assurance
Woodward guarantees the 8901-457 against defects in materials and workmanship for 12 months from date of shipment. Our global service network provides technical support and replacement units within 48 hours for critical failures.
