Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ASI133 |
| Brand | Yokogawa |
| Origin | Japan |
| Product Type | Analog Input Module |
| Channels | 8 channels, fully isolated |
| Input Signal | 4-20 mA DC |
| Input Configuration | 2-wire and 4-wire transmitter connection |
| Allowable Input Current | 22.5 mA |
| Withstanding Voltage | 1500 V AC |
| Accuracy | +/- 16 uA |
| Step Response Time | 100 ms |
| Data Update Period | 10 ms |
| Transmitter Power Supply | 16 V DC or higher, output current limit 20 mA |
| Maximum Input Voltage (4-wire) | 25 V |
| Temperature Drift | +/- 16 uA / 10 deg C |
| Maximum Current Consumption | 150 mA at 5 V DC, 450 mA at 24 V DC |
| Weight | Approx. 0.30 kg |
| External Connection Type | Pressure clamp terminal, such as ATSA3 |
| HART Communication | Supported |
| Input Resistance (2-wire, Power ON) | 400 ohm at 20 mA to 750 ohm at 4 mA |
| Input Resistance (4-wire, Power ON) | 485 ohm at 20 mA to 925 ohm at 4 mA |
4-20 mA HART Loop and Channel Isolation Characteristics
The Yokogawa ASI133 applies channel-to-channel isolation for analog current measurement circuits. Therefore, each input channel maintains electrical separation from adjacent channels and protects the DCS signal processing path from field-side disturbances.
The module supports the 4-20 mA HART loop protocol for smart transmitters. In addition, it maintains analog measurement accuracy while transferring transmitter data through the Yokogawa CENTUM input architecture.
The isolated design supports both 2-wire and 4-wire transmitter configurations. Furthermore, the module provides controlled transmitter power output with current limitation to protect connected field instruments.
Frequently Asked Questions
Q: Does the Yokogawa ASI133 support HART communication with field transmitters?
A: Yes. The ASI133 supports HART communication while receiving standard 4-20 mA DC analog signals from compatible smart transmitters.
Q: How many analog input signals can the ASI133 process simultaneously?
A: The ASI133 processes 8 analog current input channels, and each channel provides electrical isolation.
Q: What transmitter wiring configurations are supported by the ASI133?
A: The module supports both 2-wire and 4-wire transmitter connections with specified input resistance characteristics.
Field Installation Guidelines
Install the Yokogawa ASI133 in the designated CENTUM I/O subsystem slot according to the system hardware configuration manual.
Use shielded signal cables for 4-20 mA field wiring and connect cable shields according to the plant grounding practice. Avoid routing analog signal cables together with high-power AC cables, motor lines, or switching circuits to reduce electrical interference.
Verify transmitter polarity before connecting field terminals. Check loop continuity, transmitter supply conditions, and signal current range before system commissioning.
Ensure that terminal connections remain mechanically secure and that external wiring follows the specified pressure clamp terminal requirements.
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