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Product Introduction
The Yokogawa AAT145-S50 is a high-performance thermocouple (TC) and millivolt (mV) input module designed for mission-critical industrial environments. This model belongs to Yokogawa’s ProSafe-RS safety system family, tailored specifically for applications requiring SIL-certified safety integrity alongside precise temperature or low-level voltage signal monitoring.
This input module captures analog data from a wide range of thermocouple types and millivolt sources, and feeds it into the Safety Instrumented System (SIS) for monitoring and control. Its robust insulation, superior accuracy, and diagnostic features make it a reliable cornerstone in temperature-critical process safety applications.
Product Specifications
| Parameter | Specification |
|---|---|
| Model Number | AAT145-S50 |
| Input Type | Thermocouple (K, J, T, E, R, S, B, N, etc.), mV |
| Input Channels | 8 isolated channels |
| Input Signal Range | ±100 mV |
| Input Impedance | ≥10 MΩ |
| Resolution | 16-bit |
| Accuracy | ±0.1% of full scale (typical) |
| Cold Junction Compensation | Internal automatic CJC |
| Channel Isolation | 1500 V AC (channel-to-ground isolation) |
| Redundancy Support | Yes, used in redundant safety configurations |
| Diagnostic Functions | Open circuit detection, short detection, self-check |
| Power Supply | Supplied by base I/O unit (nominal 24 VDC) |
| Operating Temperature Range | 0 to 55°C |
| Storage Temperature | -20 to +70°C |
| Humidity Tolerance | 5%–95% RH (non-condensing) |
| Dimensions (W x H x D) | 107.5 × 130 × 32.8 mm |
| Weight | 0.2 kg |
| Installation | Mounted on I/O baseplate (DIN rail compatible) |
| Safety Certification | SIL3 (IEC 61508), TUV Certified |
| EMC/EMI Compliance | EN61000-6-2, EN61000-6-4 |
| System Compatibility | ProSafe-RS SIS |
Product Applications
The AAT145-S50 module is purpose-built for safety instrumented environments where temperature or low-voltage signals need to be monitored with high integrity and reliability. Key industry applications include:
-
Oil & Gas: Monitoring burner temperatures, flare systems, and pipeline heat traces.
-
Chemical Processing: Tracking exothermic reactions and hazardous process conditions.
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Power Generation: Supervising turbine metal temperatures and critical control loops.
-
Offshore Platforms: Implementing ESD (Emergency Shutdown) logic with thermal feedback.
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Refining & Petrochemicals: Used in reactor, distillation column, and cracking unit temperature safety loops.
-
Pharmaceutical & Biotech: Ensuring process temperature control in critical batch reactions.
Its SIL3 rating ensures compliance with the most stringent safety system requirements.
Product Advantages
-
Certified for Safety Applications (SIL3)
Ensures that the module can be trusted in systems requiring the highest level of safety integrity. -
High-Accuracy Thermocouple Measurements
Reliable, consistent readings across supported TC types with built-in cold junction compensation. -
Multi-Channel & Galvanically Isolated
Independent isolation per channel prevents signal interference and ground looping. -
Advanced Diagnostics
Includes open-sensor detection, channel integrity monitoring, and built-in health checks. -
Robust Design for Harsh Environments
Built to withstand industrial EMC/EMI conditions and operate reliably in wide temperature ranges. -
Compact and Modular Integration
Easily fits into Yokogawa’s I/O architecture, optimizing cabinet space. -
Redundancy Compatibility
Supports redundant configurations critical for high-availability safety systems.
Frequently Asked Questions (FAQ)
-
What is the difference between AAT145-S00 and AAT145-S50?
The S50 version is certified for use in ProSafe-RS safety systems and is SIL3 certified, while the S00 version is used in standard control systems. -
Is the AAT145-S50 suitable for use in SIS (Safety Instrumented Systems)?
Yes, it is fully compatible with ProSafe-RS and certified for SIL3 safety applications. -
Which thermocouple types are supported by this module?
The module supports all major types: K, J, T, E, R, S, B, N, and others. -
Does the module require external cold junction compensation?
No, it has built-in automatic cold junction compensation. -
What is the isolation level between the channels and ground?
Each channel is isolated at 1500 V AC from ground. -
Can the AAT145-S50 detect sensor failure?
Yes, it provides open sensor and short circuit detection per channel. -
Is it compatible with non-TC low-voltage signals?
Yes, it accepts millivolt signals up to ±100 mV. -
What’s the power supply requirement?
It receives power from the base I/O unit, typically 24 VDC. -
What kind of diagnostic feedback does it provide to the system?
It offers self-diagnostics, channel status, and fault isolation. -
What systems can the AAT145-S50 be integrated into?
It integrates seamlessly with Yokogawa’s ProSafe-RS safety system.
Related Models from the Same Series or Functionality
| Model | Description | Input Type | Channels |
|---|---|---|---|
| AAT145-S00 | TC/mV Input Module (Standard use) | Thermocouple, mV | 8 |
| AAT135-S50 | RTD Input Module (Safety-rated) | RTD | 8 |
| AAT141-S50 | Universal Analog Input Module (Safety-rated) | Voltage, Current | 8 |
| AAT232-S50 | Digital Output Module (Safety-rated) | Relay Output | 16 |
| AAT231-S50 | Digital Input Module (Safety-rated) | 24V DC | 16 |
| AAT154-S50 | Analog Output Module (Safety-rated) | 4–20 mA | 8 |
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