Overview
The Yokogawa AAR145-S00, also cataloged as the AAR145-S00 RTD/POT Input Module, operates as a dedicated hardware component for acquiring resistance temperature detector (RTD) and potentiometer signals within Yokogawa CENTUM VP and FIO system platforms. The module provides 16 isolated input channels, converts resistance-based field signals into control system data, and supports process measurement applications requiring electrical separation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAR145-S00 |
| Brand | Yokogawa |
| Product Type | RTD/POT Input Module |
| Origin | Japan |
| Weight | 0.26 kg |
| Dimensions | 3.2 x 12.5 x 13 cm (shipping size) |
| Operating Temp | Not specified |
| Power Consumption | Maximum 350 mA at 5 V DC |
| Input Channels | 16 isolated channels |
| Input Type | RTD / POT resistance input |
| Allowable Input Voltage | +/-5 V |
| Withstanding Voltage | 1500 V AC |
| RTD Measurement Current | 1 mA |
| Accuracy | RTD: +/-150 mOhm; POT: +/-0.2 %/FS |
| Tariff Code | 8537101190 |
Channel-to-Channel Isolation and Process Signal Handling
The Yokogawa AAR145-S00 uses isolated input channel architecture to separate field resistance signals from the control system interface. Therefore, the module reduces signal interference caused by potential differences between connected field devices.
The module measures RTD signals with a 1 mA excitation current and processes potentiometer inputs within the specified +/-5 V allowable input range. Additionally, the 1500 V AC withstand voltage supports electrical separation requirements between field wiring and system-side circuits.
For Yokogawa DCS applications, this module follows process I/O design principles used in CENTUM platforms, where analog measurement channels require stable conversion, channel isolation, and accurate resistance detection.
Frequently Asked Questions
Q: What type of field signals does the AAR145-S00 accept?
A: The AAR145-S00 accepts RTD and potentiometer resistance-based input signals through 16 isolated input channels.
Q: Does the AAR145-S00 provide electrical isolation between channels?
A: Yes. The module provides isolated channels and supports a withstanding voltage of 1500 V AC for electrical separation.
Q: What is the RTD measurement excitation current of the module?
A: The AAR145-S00 uses a 1 mA measurement current for RTD signal acquisition.
Field Installation Guidelines
- Install the AAR145-S00 in the designated Yokogawa I/O node or system chassis according to the applicable hardware manual.
- Verify field wiring polarity and terminal assignment before connecting RTD or potentiometer devices.
- Use shielded signal cables when installing the module in areas with electrical noise sources.
- Connect cable shields according to the site grounding standard to reduce measurement interference.
- Keep low-level resistance measurement wiring separated from high-voltage power cables.
- Confirm that connected field instruments operate within the module input range before commissioning.
- Inspect terminal connections and verify insulation conditions during maintenance activities.
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