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Flowserve Logix 520MD Digital HART Valve Positioner
Product Overview
The Flowserve Logix 520MD is a digital HART positioner for pneumatic actuators that uses piezo technology for accurate and reliable valve positioning. It accepts a 4–20 mA input signal and supports HART communication for configuration and basic diagnostics. The positioner features local calibration via buttons and offers good performance in standard process applications with low air consumption and straightforward setup.
Technical Specifications
Parameter
Specification
Input Signal
4–20 mA DC (two-wire)
Communication
HART (5, 6, 7)
Supply Air Pressure
1.5–6.0 bar (22–87 psig)
Air Consumption (steady state)
0.08 Nm³/h @ 1.5 bar to 0.12 Nm³/h @ 6.0 bar
Output Capacity
Up to 7.0 Nm³/h @ 6.0 bar
Linearity
< ±1.0% FS typical
Repeatability
< 0.2% FS
Deadband
< 0.2% FS
Operating Temperature
–40 °C to +80 °C
Enclosure Rating
IP66 / NEMA 4X
Housing Material
Aluminum (standard)
Application Industry
Chemical and petrochemical plants
Power generation
Oil & gas processing
General industrial control systems
Refineries and utilities
Common Problems & Solutions
Problem: Air supply contamination → Solution: Use clean, dry air meeting ISA-7.0.01 standards
Problem: Slow response in cold weather → Solution: Ensure proper air quality and consider low-temp options
Problem: Calibration needed after installation → Solution: Simple local QUICK-CAL with buttons
Replacement Models
Older Flowserve Logix 3000 series
Logix 3200MD (non-IS version)
Higher Logix models for advanced diagnostics
Why Buy From Us
Genuine Flowserve Logix product with warranty
Competitive pricing for standard applications
Practical technical support for setup and calibration
Xiangjing (Shanghai) - Leading Distributor of Pneumatic and Electric Control Valves
Established in Shanghai, China, Xiangjing(Shanghai) Mechanical and Electrical Tech Co.,Ltd has been a trusted distributor of high-quality pneumatic and electric control valves for many years. With extensive industr...
Xiangjing (Shanghai) - Leading Distributor of Pneumatic and Electric Control Valves
Established in Shanghai, China, Xiangjing(Shanghai) Mechanical and Electrical Tech Co.,Ltd has been a trusted distributor of high-quality pneumatic and electric control valves for many years. With extensive industr...