Flowserve / Logix 500si Series
Flowserve Logix 520si Digital Valve Positioner
Two-wire 4-20 mA HART digital valve positioner for single-acting linear and rotary actuators.
Product Overview
HART position control powered by the command signal
Flowserve Logix 520si is a smart digital valve positioner in the Logix 500si family. It is powered entirely from the two-wire 4-20 mA command signal and communicates through HART.
The positioner controls single-acting linear or rotary actuators. Local setup uses the Quick-Cal button, jog buttons, DIP switches, gain selector and three status LEDs.
Official Flowserve Logix 500si mounting options applicable to the Logix 520si.
Product Specifications
Official identification and technical data
| Brand | Flowserve |
|---|---|
| Model | Logix 520si |
| Product family | Logix 500si |
| Input signal | Two-wire 4-20 mA |
| Communication | HART |
| Actuator type | Single-acting linear or rotary |
| Minimum start/operate current | 3.6 mA |
| Compliance voltage | 12.6 Vdc |
| Maximum supply voltage | 30 Vdc |
| Input resistance | 500 ohms at 20 mA |
| Supply pressure | 1.5-6 barg |
| Air connection | 1/4 NPT |
| Enclosure | Die-cast, powder-painted aluminum |
| Shaft material | Stainless steel |
| Seal material | Nitrile |
| Degree of protection | IP65 |
Operating Functions
Digital positioning, local setup and HART access
4-20 mA command
The positioner derives both power and position command from the two-wire current loop.
HART communication
The 520si provides digital communication over the analog loop.
Quick-Cal setup
Local push-button calibration supports commissioning without a separate calibrator.
Status diagnostics
Three LEDs communicate operating and setup information.
FAQ
Flowserve Logix 520si technical questions
What input signal powers Logix 520si?
A two-wire 4-20 mA command signal powers and controls the positioner.
Which communication protocol is supported?
HART.
Which actuators can it control?
Single-acting linear and rotary actuators.
What is the minimum operating current?
The official specification lists 3.6 mA.
What supply-pressure range is specified?
1.5-6 barg.
Installation Highlights
Single-acting actuator and pneumatic connection
Linear or rotary mounting
The official family supports single-acting linear and rotary actuators.
Instrument-air connection
The documented supply range is 1.5-6 barg through 1/4 NPT pneumatic ports.
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