Overview
The Yokogawa AAR145-S50, also cataloged as the AAR145-S50 TC/RTD Input Module, operates as a dedicated hardware component for temperature and resistance signal acquisition within Yokogawa control system I/O platforms. It receives isolated field signals from RTD, thermocouple, and potentiometer inputs, then converts measured values into process data.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAR145-S50 |
| Brand | Yokogawa |
| Product Type | TC/RTD 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 Types | Thermocouple, RTD, POT |
| Allowable Input Voltage | +/-5 V |
| Input Resistance | 1 Mohm or larger |
| RTD Standard | JIS C1604:1997 |
| RTD Specification | IEC751:1995 Pt100, 3-wire type |
| POT Resistance Range | Total resistance 100 ohm to 10 kohm |
| POT Span Resistance | 50% or larger of total resistance |
| RTD Measurement Current | 1 mA |
| Signal Source Resistance | 150 ohm or less including wiring |
| Tariff Code | 8537101190 |
| Shipment Location | Xiamen, China |
Yokogawa Process Signal Measurement and Channel Isolation
The AAR145-S50 provides 16 isolated input channels for temperature and resistance measurement applications. Therefore, each channel can acquire field signals while maintaining electrical separation between input circuits.
For Yokogawa process control architectures, channel-to-channel isolation supports stable measurement of RTD and potentiometer signals in industrial environments. The module accepts Pt100 3-wire RTD inputs according to IEC751:1995 and JIS C1604:1997 requirements.
Additionally, the module design follows Yokogawa DCS signal acquisition methods, where accurate analog measurement depends on correct field wiring, sensor excitation current, and resistance compensation. The RTD measurement circuit applies a 1 mA measurement current, while the input stage maintains an input resistance of 1 Mohm or higher.
Frequently Asked Questions
Q: How many input channels does the Yokogawa AAR145-S50 provide?
A: The AAR145-S50 provides 16 isolated input channels for TC, RTD, and potentiometer signal measurement.
Q: What RTD sensors are supported by the AAR145-S50?
A: The module supports JIS C1604:1997 RTD sensors and IEC751:1995 Pt100 3-wire type configurations.
Q: What wiring limitation applies to the RTD signal source?
A: The resistance of the signal source plus wiring must be 150 ohm or less for RTD measurement operation.
Field Installation Guidelines
- Install the AAR145-S50 according to the Yokogawa system hardware configuration requirements.
- Verify RTD wiring polarity and 3-wire compensation connections before powering the module.
- Keep sensor signal wiring separated from high-voltage power cables to reduce electrical interference.
- Connect shield layers according to the applicable Yokogawa grounding practices.
- Confirm field device resistance values remain within the specified input range before commissioning.
- Check module power supply conditions and verify the 5 V DC system load capacity.
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