Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AST143-S00 / AST143 |
| Brand | Yokogawa |
| Origin | Japan |
| Module Type | Thermocouple / Millivolt (TC/mV) Input Module |
| System Compatibility | Yokogawa CENTUM VP and FIO Distributed Control Systems |
| Number of Channels | 16 isolated input channels |
| Supported Input Signals | Thermocouple Types B, E, J, K, N, R, S, T; direct millivolt voltage input |
| Input Type | Temperature and low-level analog voltage acquisition |
| Isolation Method | Channel-to-channel and channel-to-ground galvanic isolation |
| Reference Junction Compensation | Built-in cold junction compensation (CJC/RJC), accuracy +/- 1.0 deg C |
| Data Update Period | 1 second or less; system configuration can support faster updates |
| Accuracy at 23 deg C | TC: +/- 40 uV; mV: +/- 80 uV |
| Temperature Drift | TC: +/- 125 uV / 10 deg C; mV: +/- 250 uV / 10 deg C |
| Withstanding Voltage | 1500 VAC between isolated circuits and ground |
| Input Resistance | >= 1 Mohm |
| Burnout Detection | Configurable per channel group: Up-scale, Down-scale, or Off |
| Power Supply Voltage | 24 VDC +/- 10% |
| Power Consumption | Approx. 150 mA at 5 VDC; 80 mA at 24 VDC |
| Operating Temp | -20 deg C to +70 deg C |
| Weight | Approx. 0.30 kg |
| Terminal Connections | Pressure Clamp Terminals such as ATST4 series, ATSS3 series, and ATS T4S |
Yokogawa DCS Signal Isolation and Temperature Measurement Features
The AST143 applies Yokogawa process I/O technology for direct connection of thermocouple and millivolt field signals. Furthermore, the module separates each input channel electrically to reduce ground loop influence and external noise coupling.
The integrated cold junction compensation (CJC) circuit calculates thermocouple reference temperature internally. Therefore, the control system receives compensated temperature values without requiring additional external compensation hardware.
Additionally, the module supports configurable burnout detection functions. The input circuit identifies open sensor conditions and transfers the configured upscale or downscale signal state to the CENTUM VP control application.
The isolated channel architecture supports stable analog measurement in DCS environments. Moreover, the module design matches Yokogawa requirements for FOUNDATION Fieldbus / Profibus PA related process instrumentation integration through system-level I/O management.
Frequently Asked Questions
Q: Does the AST143 support independent isolation between input channels?
A: Yes. The AST143 provides channel-to-channel and channel-to-ground galvanic isolation for connected TC and mV field signals.
Q: What thermocouple types can the AST143 process?
A: The module supports Type B, E, J, K, N, R, S, and T thermocouple inputs together with direct millivolt voltage signals.
Q: Does the AST143 require external cold junction compensation equipment?
A: No. The module includes internal reference junction compensation circuitry for thermocouple measurement.
Field Installation Guidelines
- Install the AST143 module according to Yokogawa CENTUM VP FIO hardware installation procedures.
- Connect thermocouple wiring with correct polarity to prevent measurement errors.
- Use shielded signal cables for low-level millivolt inputs and connect cable shields according to the system grounding design.
- Separate thermocouple and millivolt signal wiring from high-voltage power cables to reduce electrical interference.
- Verify terminal block compatibility before field wiring installation.
- Confirm the configured burnout detection direction matches the process control requirements.
- Check module power supply polarity and grounding conditions before energizing the I/O station.
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