Product Overview
The Yokogawa ASI133 acquires high-precision analog signals from field transmitters and sensors. This module processes 8 differential input channels with 4–20 mA or 1–5 VDC signal types. It converts these analog measurements into digital values for the control system. The unit integrates seamlessly into Yokogawa CENTUM and ProSafe-RS platforms.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | ASI133 |
| Product Type | Analog Input Module |
| Number of Inputs | 8 differential channels |
| Input Signal Types | 4–20 mA, 1–5 VDC |
| Resolution | 16 bits |
| Accuracy | ±0.05% of span at 25°C |
| Temperature Drift | ±25 ppm/°C |
| Input Impedance | 250 Ω (current), >1 MΩ (voltage) |
| Common Mode Rejection | 130 dB at 50/60 Hz |
| Sampling Rate | 10 samples per second per channel |
| Power Dissipation | 3.8 W typical |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | –40°C to 85°C |
| Humidity Range | 5% to 95% non-condensing |
Physical Dimensions and Mounting
This module measures 130 mm in height, 30 mm in width, and 100 mm in depth. The unit weighs approximately 0.28 kg. It mounts directly onto a DIN rail within the system cabinet. The front panel includes 8 LED indicators for channel activity monitoring. These LEDs show input status and fault conditions clearly.
Electrical Interface and Field Wiring
A 37-pin D-sub connector provides the primary interface for field wiring connections. The module accepts 4–20 mA or 1–5 VDC inputs through software configuration. Each channel includes built-in 250 Ω resistors for current loop applications. The input circuitry provides overvoltage protection up to 30 VDC. Field devices like pressure transmitters, temperature sensors, and flow meters connect directly to these terminals.
Performance and Signal Processing
The ASI133 delivers 16-bit resolution for precise measurement of process variables. It samples each channel at 10 times per second for responsive monitoring. The module filters input signals to reject 50 Hz and 60 Hz electrical noise. The analog-to-digital converter maintains excellent linearity over the full range. Moreover, the module performs automatic calibration checks to maintain long-term accuracy.
Installation and System Integration
You can install this module in any available slot within the Yokogawa CENTUM chassis. The backplane automatically handles address assignment and power distribution. Always configure the input type using the system engineering software. For critical measurements, implement redundant modules for continuous monitoring. Verify the field wiring polarity matches the termination diagram.
Environmental Compliance and Certification
This module carries CE marking and UL recognition for industrial deployment. It also complies with RoHS and WEEE environmental directives. The conformal coating protects the PCB against moisture and dust ingress. This coating enhances long-term reliability in harsh plant conditions.
Details
| Weight | 0.35 kg |
|---|---|
| Dimensions | 130 × 40 × 120 mm |
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