Description
Application Scenarios
In a petroleum refinery‘s crude distillation unit, accurate temperature measurement across dozens of column trays is essential for product quality and energy efficiency. The instrumentation team had historically struggled with signal interference from nearby high-voltage motor drives, which corrupted RTD readings and triggered false high-temperature alarms. When the facility migrated to a Yokogawa CENTUM VP control system, the YOKOGAWA AAR145-S00 S1 was selected specifically for its full channel isolation. Each of the 16 input channels operates independently, preventing a ground fault or noise spike on one sensor from affecting adjacent measurements. Since commissioning the YOKOGAWA AAR145-S00 S1, the refinery reported a substantial reduction in nuisance alarms and a measurable improvement in distillation column temperature stability, directly contributing to tighter product specifications and lower reboiler energy consumption.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | YOKOGAWA AAR145-S00 S1 |
| Manufacturer | Yokogawa Electric Corporation |
| Product Category | RTD/POT Input Module (Isolated Channels) |
| Input Channels | 16, channel-to-channel isolated |
| Input Signal Types | RTD, Potentiometer (POT), mV, Thermocouple (TC) |
| RTD Compatibility | JIS C1604:1997, IEC751:1995 Pt100 (3-wire) |
| POT Resistance Range | Total 100 Ω to 10 kΩ |
| Allowable Input Voltage | ±5 V |
| Measurement Current (RTD) | 1 mA |
| Data Update Period | 1 s |
| RTD Accuracy | ±150 mΩ |
| POT Accuracy | ±0.2% F.S. |
| Maximum Current Consumption | 350 mA (5 V DC) |
| Weight | Approximately 0.3 kg |
| External Connection | Dedicated cable |
| Suffix Code | S = Standard type, 0 = Basic type |
Technical Principles and Innovative Values
The YOKOGAWA AAR145-S00 S1 operates on a precision excitation and measurement principle, supplying a stable 1 mA measurement current to RTD elements and reading the resulting voltage drop to calculate resistance and temperature. For potentiometer inputs, the module measures the voltage division ratio to determine position or displacement. Its design prioritizes signal integrity and system reliability in ways that distinguish it from standard temperature input cards.
- Innovation Point 1 – True Channel-to-Channel Isolation: Unlike multiplexed input modules that share a common analog front-end, the YOKOGAWA AAR145-S00 S1 isolates every channel from the field and from each other. This architecture eliminates cross-channel interference and prevents a single sensor fault from compromising adjacent measurements, a critical advantage in processes where a corrupted temperature reading could trigger unnecessary shutdowns or unsafe conditions.
- Innovation Point 2 – Multi-Signal Flexibility in One Module: The YOKOGAWA AAR145-S00 S1 accepts RTD, potentiometer, millivolt, and thermocouple signals, with input mode selectable by software for each channel. This flexibility means a single spare module can serve multiple measurement types, simplifying inventory management and reducing the number of distinct card variants a facility must stock.
- Innovation Point 3 – Dual Redundant Configuration Support: The module supports dual-redundant operation, allowing two YOKOGAWA AAR145-S00 S1 units to run in parallel with automatic failover. For temperature measurements tied to safety instrumented functions or critical quality parameters, this redundancy provides continuous data availability even during module maintenance or unexpected failure.
