ABB

1.Main Functions

Analog signal conditioning and conversion: Receives weak raw analog signals from field transmitters and sensors. It completes amplification, impedance matching, low‑pass filtering, and converts unstandardized field signals into standard analog levels compatible with INFI‑90 back‑plane bus. Compared with PS 830, PS 831 supports wider input signal range and higher noise suppression capability.More products: www.plcva.com
Galvanic electrical isolation: Provides complete isolation between field instrument circuits and DCS controller internal circuits. It eliminates ground‑loop interference, common‑mode noise and transient surge disturbances from long field cables, protecting downstream I/O and controller hardware.

PS 831 Signal Conditioning Module

Zero‑point and span calibration: Equipped with hardware potentiometers for on‑site offset and gain adjustment. Technicians can calibrate zero offset and measurement span to match different sensor output characteristics and correct signal drift.
Signal interface adaptation: Acts as a signal bridge between field‑side process instrumentation and INFI‑90 rack back‑plane bus. It makes non‑standard industrial sensor signals recognizable by DCS input modules.plcva.com
Noise filtering and signal stabilization: Suppresses high‑frequency interference spikes, reduces signal jitter. It delivers smooth, stable analog measurement values for closed‑loop control loops.
Fault‑tolerant signal transmission: Minimizes signal distortion in heavy‑EMI industrial environments, improving overall measurement reliability of the control system.

PS 831 Signal Conditioning Module

Legacy DCS control cabinet deployment: Installed inside ABB Bailey INFI‑90 DCS racks, arranged between field‑wired instrumentation and main I/O processing modules.
Process industry analog measurement: Processes analog signals from pressure transmitters, flow meters, level sensors and analog temperature transducers.
High‑interference industrial sites: Widely applied in thermal power plants, chemical plants, pulp‑and‑paper mills and metallurgical plants with long field wiring and strong electromagnetic interference.

PS 831 Signal Conditioning Module

System retrofitting and spare‑part replacement: Serves as spare replacement component for aging INFI‑90 control racks, used for plant maintenance, equipment overhaul and old‑system upgrade projects.
Closed‑loop process regulation: Supplies conditioned analog process variables to PID control algorithms, supporting stable automatic regulation of industrial production loops.