Description
TRICONEX 3700A Analog Input Module
Product Overview:
The TRICONEX 3700A is a high-density, triple modular redundant (TMR) analog input module designed for the Tricon safety instrumented system. It serves as the critical interface for acquiring continuous analog signals from safety-critical field transmitters. Its primary function is to convert standard 4-20 mA or 0-5 V DC process signals—representing variables like pressure, temperature, level, and flow—into three independent, high-resolution digital values for the three main processors. This module ensures that analog safety data is collected with high accuracy, integrity, and diagnostic coverage, forming the foundation for reliable process monitoring and shutdown logic in SIL 3 certified safety loops.
Key Features and Advantages:
Triple-Channel Signal Acquisition and High Accuracy:
Each input channel on the TRICONEX 3700A is triplicated with three completely isolated signal conditioning and analog-to-digital conversion (ADC) circuits, one per TMR channel. This ensures that a single fault in any channel does not corrupt the measurement. The module features high-resolution ADCs, providing precise digitization of the analog signal to detect even small deviations in the process variable, which is essential for reliable trip point detection.
Advanced Loop Diagnostics and Power Supply:
A key feature is its integrated 24V DC loop power supply for two-wire field transmitters. The module performs continuous, online diagnostics on the field loop itself. It can detect critical faults such as open circuit (broken wire), short circuit, and transmitter malfunction by monitoring loop current and voltage. This provides early warning of potential sensor or wiring failures before they lead to an undetected dangerous condition in the safety system.
High Density and Configurability:
The TRICONEX 3700A provides a high channel count in a single module, optimizing rack space. Each channel can be independently configured via software for input type (4-20 mA or voltage) and range. It also supports advanced functions like square root extraction for flow signals from differential pressure transmitters, linearization for thermocouples/RTDs (often via associated terminal boards), and custom scaling, reducing the need for external signal conditioners.
Online Replacement and Fault Tolerance:
Engineered for maximum system availability, the module supports online, hot-replacement maintenance. If diagnostics indicate a fault, the TRICONEX 3700A can be safely removed and replaced while the Tricon system remains online. The TMR architecture ensures that the two remaining healthy channels for each input continue to provide valid data for voting, maintaining the safety function’s integrity without requiring a process shutdown.
Technical Specifications:
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Feature
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Specification
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|---|---|
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Product Model
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TRICONEX 3700A
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Module Type
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TMR Analog Input Module
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Input Signal Types
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4-20 mA (2-wire/4-wire), 0-5 V DC, 1-5 V DC
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Number of Channels
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8 channels (triplicated, 24 total input circuits)
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Resolution
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High-resolution (e.g., 16-bit) ADC per channel
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Loop Power
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24 V DC for 2-wire transmitters (per channel)
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Key Diagnostics
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Open circuit, short circuit, over-range, under-range, module fault
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Hot Replacement
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Supported
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Application Areas:
The TRICONEX 3700A is deployed wherever continuous process variables must be monitored with high reliability for safety purposes. It is a core component in Emergency Shutdown (ESD) systems for monitoring pressures, levels, and flow rates in oil & gas pipelines and process vessels. In Fire & Gas (F&G) systems, it connects to analog gas detectors. It is also essential in Burner Management Systems (BMS) for monitoring furnace draft pressure and fuel flow, and in Turbomachinery Control for reading critical speed, temperature, and vibration analog signals.
Related Products:
TRICONEX 3704E:
A TMR Digital Input Module. While the TRICONEX 3700A handles continuous analog signals, the 3704E handles discrete on/off signals. Together, they provide the complete spectrum of process and status inputs to the safety system.
TRICONEX 3805E:
A TMR Digital Output Module. The analog values read by the TRICONEX 3700A are processed by the safety logic. If a shutdown is required, the logic commands final elements (e.g., valves) via analog output modules or discrete outputs like those on the 3805E.
TRICONEX 4351B:
The Main Processor Module. The three independent analog values from each channel of the TRICONEX 3700A are transmitted to the corresponding channel of the TRICONEX 4351B. The main processor performs a mid-value selection vote on these triplicated inputs to determine a single, validated process value for use in the safety logic application.
Other related models:
| TRICONEX | 4351B | Communication Module |
| TRICONEX | 3721 | Analog Input Module |
| TRICONEX | 3625 | Digital Output Module |
| TRICONEX | 3625A | Digital Output Module |
| TRICONEX | 3604E | Optically isolated, non-common. Voltage: 24VDC. Number of outputs: 16. |
| TRICONEX | 3504E | High-density—common, DC-coupled. Voltage: 24/48VDC. Number of input points: 64 |
| TRICONEX | 3503E | Digital input module. 8 points per group, shared, with self-test function. Voltage: 24VAC/VDC. Number of input points: 32 |
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