ABB

1.Main Functions

Wide‑range analog signal acquisition and conditioning: Accepts low‑level raw analog signals from field transmitters and sensors. It completes amplification, impedance transformation, multi‑stage low‑pass filtering and signal scaling, and converts diverse non‑standard field input signals into standardized analog levels compatible with INFI‑90 back‑plane bus. Compared with PS851, PS853 provides broader input signal adaptability and superior noise‑rejection performance.
Enhanced galvanic isolation: Delivers complete electrical separation between field instrument circuits and DCS internal circuitry. It suppresses ground‑loop currents, common‑mode interference, and transient surge disturbances induced by long‑distance field cables, protecting downstream I/O boards and controller hardware from voltage spikes.More products: www.plcva.com

PS 853 High‑Performance Isolated Analog Signal Conditioning Module

Precision hardware zero‑point and span calibration: Equipped with high‑resolution potentiometers for on‑site offset and gain tuning. Field technicians can calibrate zero offset and full‑scale span to compensate for sensor drift and match different transducer output characteristics.
Signal interface bridging: Acts as an electrical adapter between field‑side process instrumentation and INFI‑90 rack back‑plane bus. It translates heterogeneous sensor outputs into process‑readable signals for subsequent DCS processing modules.plcva.com
Advanced multi‑order noise filtering: Suppresses high‑frequency EMI noise and signal jitter in heavy‑interference industrial environments. It outputs smooth, stable analog process variables for control loop calculation.
Improved signal fidelity: Optimized circuit design reduces signal distortion under harsh field conditions, improving overall measurement reliability for critical process loops.

PS 853 High‑Performance Isolated Analog Signal Conditioning Module

Legacy INFI‑90 DCS cabinet deployment: Installed inside standard ABB Bailey INFI‑90 racks, positioned between field instrument wiring and DCS main I/O processing boards.
Industrial process analog measurement: Conditions analog signals from pressure transmitters, flow transmitters, level sensors and analog temperature transducers. Preferred for measurement loops requiring higher stability than PS851.
High‑EMI heavy‑industry sites: Widely deployed in thermal power plants, chemical complexes, pulp‑and‑paper mills and metallurgical plants with long field cables and severe electromagnetic disturbances.

PS 853 High‑Performance Isolated Analog Signal Conditioning Module

Plant maintenance, spare‑part replacement and system retrofitting: Used as critical spare replacement component for aging INFI‑90 control racks, applied in equipment overhaul, on‑site repair and legacy‑system modernization projects.
Critical closed‑loop process regulation: Feeds conditioned high‑stability process variable signals to DCS PID control algorithms, supporting reliable automatic closed‑loop control for key production loops.