Overview
Key Features
- 8 isolated analog input channels.
- 4-20 mA input signal.
- Built-in isolated interface barrier.
- Supports 2-wire and 4-wire transmitters.
- 100 ms step response time.
- 10 ms data update period.
- HART communication available with the -H configuration.
- FM hazardous-location protection specifications.
- Pressure-clamp terminal connection.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | ASI133-S00 |
| Brand | Yokogawa |
| Product Type | Analog Input Module with Built-In Barrier |
| Number of Input Channels | 8, isolated |
| Input Signal | 4-20 mA |
| Allowable Input Current | 22.5 mA |
| Barrier Type | Isolated interface |
| Withstanding Voltage | 1500 V AC |
| Input Accuracy | ±16 µA |
| Step Response Time | 100 ms |
| Data Update Period | 10 ms |
| Transmitter Power Supply | 16 V DC or higher |
| Transmitter Output Current Limit | 20 mA |
| Maximum Normal Mode Input Voltage | 25 V (4-wire transmitter) |
| 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 |
| Input Resistance (Power OFF) | 1 Mohm or larger |
| Ambient Temperature Drift | ±16 µA/10 deg C |
| Maximum Current Consumption (5 V DC) | 150 mA |
| Maximum Current Consumption (24 V DC) | 450 mA |
| External Connection | Pressure-clamp terminal (ATSA3 series) |
| Operating Temperature Option | -20 to 70 deg C |
| Corrosion Protection Option | ISA Standard G3 |
| Weight | 0.3 kg |
| HART Communication | Available with -H suffix |
Analog Input and Transmitter Connections
The ASI133-S00 receives 4-20 mA signals through eight isolated input channels. It supports both 2-wire and 4-wire transmitters, so users can select the connection method according to the field instrument requirements.
For 2-wire transmitters, the module provides a supply voltage of at least 16 V DC, with an output current limit of 20 mA. For 4-wire transmitters, the normal mode input voltage at the terminals must not exceed 25 V. Therefore, check the transmitter wiring and input resistance before selecting the connection method.
Built-In Barrier and Protection
The built-in barrier provides an isolated interface between the field signal circuits and the control system. Its 1500 V AC withstand voltage defines the specified electrical isolation test rating. In addition, the module has FM protection classifications for specific hazardous locations.
The listed FM classifications include:
- Associated intrinsically safe apparatus for connection to Class I, II and III, Division 1, Groups A, B, C, D, E, F and G.
- Class I, Zone 0, Group IIC.
- Nonincendive use in Class I, Division 2, Groups A, B, C and D.
- Temperature code T4.
The module also lists RCM EMC conformity to EN 55011 Class A Group 1. Check the applicable installation and certification requirements before selecting the module for a hazardous area.
Model Configuration and Terminal Options
The ASI133 model uses suffix codes to identify its communication and hardware configuration. The following codes distinguish the standard version from other available configurations.
| Code | Description |
|---|---|
| ASI133 | Analog Input Module with Built-In Barrier |
| -S | Standard type |
| -H | HART communication |
| 0 | Fixed code |
| 0 | Fixed code |
| /SA3S0 | Pressure-clamp terminal for analog input, model ATSA3S-0 |
| /SA3D0 | Dual-redundant pressure-clamp terminal for analog input, model ATSA3D-0 |
The ASI133-S00 identifies the standard-type configuration. The -H suffix identifies the HART communication version. The /SA3S0 and /SA3D0 codes specify separate terminal options, so confirm the required terminal arrangement when ordering.
Frequently Asked Questions
Q: How many input channels does the Yokogawa ASI133-S00 have?
A: It has eight isolated analog input channels. Each channel accepts a 4-20 mA signal from a field transmitter.
Q: Does the ASI133-S00 support 2-wire and 4-wire transmitters?
A: Yes. It supports both connection types. However, each type has different input resistance characteristics, and 2-wire transmitters also use the module’s transmitter power supply.
Q: Does the ASI133-S00 support HART communication?
A: The -S suffix identifies the standard version. For HART communication, select the -H configuration instead.
Q: Which terminal options are available for the ASI133?
A: The specified options include ATSA3S-0 pressure-clamp terminals and ATSA3D-0 dual-redundant pressure-clamp terminals. Select the terminal option according to the required connection arrangement.
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