Yokogawa ASI133-S00/SA3S0 8-Channel Analog Input Module with Built-in Barrier

Yokogawa ASI133-S00/SA3S0 Analog Input Module - Intrinsically Safe Signal Acquisition

The Yokogawa ASI133-S00/SA3S0 stands as a specialized 8-channel analog input module designed for hazardous area applications requiring intrinsic safety protection. Featuring integrated barrier technology, this module enables direct connection to field transmitters in Zone 1 and Division 1 classified locations while maintaining system integrity within the safe area control room.

Technical Specifications

• Input Channels: 8 isolated analog inputs with individual barriers
• Signal Type: 4 to 20 mA DC current loop
• Isolation: Channel-to-channel and channel-to-system isolation
• Barrier Type: Built-in Zener barrier (SA3S0 specification)
• Intrinsic Safety: ATEX/IECEx certified for Zone 0/1 applications
• Resolution: 16-bit A/D conversion for high-precision measurement
• Accuracy: ±0.1% of span including linearity and repeatability
• Update Time: 100ms per channel scan cycle
• Operating Temperature: -20°C to +60°C ambient
• Power Consumption: Maximum 5W from backplane bus

Application Scenarios

This barrier-equipped module serves critical roles in oil and gas production facilities where pressure, temperature, and flow transmitters reside in explosive atmospheres. Refineries deploy the ASI133-S00/SA3S0 for monitoring reactor vessel conditions, distillation column parameters, and pipeline flow measurements without requiring external barrier panels.

Chemical manufacturing plants leverage this module's intrinsic safety certification for direct interface with hazardous area instrumentation, eliminating costly marshalling cabinets and reducing installation footprint. Offshore platforms benefit from the compact design that consolidates barrier functionality within the DCS I/O rack, saving valuable panel space in equipment rooms.

Pharmaceutical production environments utilize these modules for cleanroom monitoring applications where both explosion protection and signal integrity are paramount. The isolated architecture prevents ground loop interference common in distributed sensor networks spanning multiple process areas.

Integration Solutions

The ASI133-S00/SA3S0 integrates seamlessly into Yokogawa CENTUM VP and CENTUM CS 3000 distributed control systems through standard I/O bus connectivity. Field wiring terminates at blue-coded intrinsically safe terminals, clearly distinguishing hazardous area circuits from standard I/O connections. The module auto-registers upon installation, with the engineering station automatically detecting barrier parameters and safety limits.

Configuration software enables engineers to define custom input ranges, implement square root extraction for differential pressure flow calculations, and establish sensor failure detection thresholds. The built-in barrier eliminates external safety barriers, reducing wiring complexity and potential failure points while maintaining full compliance with IEC 60079 standards.

Why Choose ASI133-S00/SA3S0

Yokogawa's integrated barrier technology delivers certified intrinsic safety without the installation complexity and maintenance burden of traditional barrier panels. The module's individual channel isolation ensures that a fault on one input cannot propagate to adjacent channels, maintaining system availability during sensor failures or wiring faults.

Diagnostic capabilities include loop current monitoring, barrier status verification, and automatic sensor health checks that alert operators to degraded transmitter performance before process upsets occur. Backed by Yokogawa's global hazardous area certification portfolio and field-proven reliability in demanding process industries, the ASI133-S00/SA3S0 represents a robust solution for safety-critical measurement applications.

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