Description
Yokogawa AAR181‑S50 S2
Technical Specifications: Input signal types: Pt100, Pt50, Pt200, Cu50 RTD sensors and 3‑wire potentiometer signals; number of input channels: 16 channels; channel‑to‑channel galvanic isolation; resolution 16‑bit; conversion cycle configurable; safety qualification for ProSafe‑RS SIS system; power supply draws operating power from ProSafe‑RS rack backplane bus; operating temperature 0 °C‑60 °C; storage temperature ‑20 °C‑70 °C; humidity 10‑90 %RH non‑condensing; rack‑slot installation for ProSafe‑RS main and expansion racks; front‑panel LED indicators for channel signal status, module run state and fault alarm; weight 0.82 kg; supports open‑wire detection for RTD sensor circuits.
Functional Features: 16‑channel isolated acquisition for RTD temperature and potentiometer position signals; per‑channel open‑circuit detection identifies broken field sensor wiring; galvanic isolation between individual input channels suppresses ground‑loop interference from field instrumentation loops; hardware self‑diagnosis detects module internal hardware failure and backplane communication abnormality; front‑panel LED status array shows module run status and channel fault events; digital converted measurement data transmits to ProSafe‑RS CPU via rack backplane bus; S2 hardware revision enhances long‑term stability under process‑plant environmental stress.
Application Scenarios: Safety‑related temperature monitoring loops in chemical and petrochemical plants; furnace and reactor over‑temperature safety detection; tank level potentiometer signal acquisition for safety interlock logic; oil‑gas plant SIS temperature measurement points; ProSafe‑RS system spare‑part replacement and maintenance projects.
Performance Parameters: Measurement accuracy conforms to ProSafe‑RS safety‑system specification; channel‑to‑channel isolation withstand voltage meets industrial process‑instrument standards; vibration and shock resistance comply with cabinet‑mount process‑control hardware requirements; supports continuous 24‑7 operation within non‑condensing industrial cabinet environments.
Material Composition: Orange V0 flame‑retardant engineering‑plastic rack‑module housing; FR‑4 multilayer glass‑fiber printed‑circuit board; high‑precision analog‑to‑digital conversion chips; channel‑wise galvanic isolation components; gold‑plated backplane edge‑connector contacts; multi‑color SMD status LED indicators; metal mechanical locking latches.
Structural Features: Standard ProSafe‑RS rack‑slot form factor; rear‑side gold‑plated edge‑connector mates with rack backplane bus; front‑panel houses LED status indicator group; side metal locking clips fasten module into rack I/O slot; field‑sensor wiring connects via corresponding FTA terminal assembly outside rack housing.
Working Principle: Field RTD or potentiometer resistance signals route through FTA terminal block to AAR181‑S50 S2 input channels. Each channel’s analog front‑end circuit applies constant excitation current to RTD sensor, measures resulting voltage drop proportional to sensor resistance value. Galvanic isolation circuits separate field‑side analog signals from internal module digital logic domain. Analog‑to‑digital converter transforms resistance measurement values into 16‑bit digital data. Digital measurement data transfers to ProSafe‑RS CPU through rack backplane bus. Internal diagnostic logic detects sensor open‑wire condition and module hardware faults, driving front‑panel LED indicators accordingly.
Installation Requirements: Insert AAR181‑S50 S2 into designated I/O slot of ProSafe‑RS main or expansion rack; lock side mechanical latches for secure rack‑slot fixation; use certified FTA terminal assemblies for field RTD sensor wiring; deploy shielded twisted‑pair cables for field sensor signal transmission; separate analog sensor cables from high‑power motor and inverter power cables; ensure control cabinet and rack implement reliable protective grounding.
Usage Notes: Follow official hot‑swap operational procedures for module replacement on powered‑on rack; configure sensor type and measurement parameters within ProSafe‑RS engineering software before commissioning; verify 3‑wire RTD wiring correctness to avoid measurement deviation; avoid deployment in environments with corrosive gas, liquid splash or condensation; inspect FTA terminal screw tightening torque during periodic maintenance.
