Description

The Bailey 6637517A1 is a specialized control system module originally developed by Bailey Controls, which became part of ABB’s extensive industrial automation portfolio through corporate acquisitions. This robust electronic module serves as a critical component within distributed control systems (DCS), specifically designed for process control and monitoring applications in power generation and heavy industrial environments. The Bailey 6637517A1 functions as a signal conditioning, processing, or interface module within the Bailey INFI 90 or NETWORK 90 control systems, providing essential data acquisition, signal processing, and control functionality. Its primary role involves maintaining signal integrity between field devices and higher-level control systems while ensuring reliable operation in demanding industrial conditions.

Manufactured to exacting quality standards, the 6637517A1 module exemplifies the reliability and durability characteristic of Bailey’s design philosophy. The module features robust construction with military-grade components that ensure stable operation across wide temperature ranges and challenging environmental conditions. Its design incorporates advanced noise immunity and electrical isolation techniques that maintain signal accuracy even in electrically noisy industrial environments. The Bailey 6637517A1 is engineered for seamless integration within Bailey’s control ecosystem, offering backward compatibility and long-term reliability that has made Bailey systems preferred solutions in critical power generation and process industry applications where equipment longevity and operational stability are paramount.

6637517A1 BAILEY

Technical Specifications

Parameter Name	Parameter Value
Product Model	6637517A1
Manufacturer	Bailey Controls (now part of ABB)
Product Type	Control System Module
Input Voltage	24 V DC (±10%) or 115 V AC (system dependent)
Power Consumption	<6 W (typical operation)
Operating Temperature	-20°C to +70°C (-4°F to +158°F)
Storage Temperature	-40°C to +85°C (-40°F to +185°F)
Relative Humidity	5% to 95% (non-condensing)
Signal Types	4-20 mA, 0-10 V, thermocouple, RTD, digital
Isolation Voltage	1500 V RMS (channel-to-channel)
Accuracy	±0.1% of span (typical)
Response Time	<250 ms (for full scale step change)
Communication	Bailey circular loop, RS-485, compatible with INFI-NET
MTBF	>150,000 hours
Certifications	UL, CSA (original specifications)

Main Features and Advantages

The Bailey 6637517A1 offers exceptional reliability and longevity through its robust design and quality manufacturing. The module features advanced signal conditioning capabilities that ensure accurate measurement of process variables even in electrically noisy environments typical of power generation facilities. Its built-in isolation and filtering capabilities protect against ground loops and electromagnetic interference, maintaining signal integrity for precise control and monitoring. The module’s field-proven design has demonstrated operational stability in some of the most demanding industrial environments, with many original Bailey modules remaining in service for decades with minimal maintenance requirements.

Backward compatibility and system integration represent significant advantages of the 6637517A1, with seamless operation within existing Bailey INFI 90 and NETWORK 90 control architectures. The module’s robust construction ensures reliable operation across wide temperature ranges and harsh environmental conditions, reducing the need for environmental control in control cabinets. The Bailey 6637517A1 also features modular design that facilitates easy maintenance and replacement, with clear status indicators that simplify troubleshooting and reduce mean time to repair. These features combine to provide a control solution that delivers both long-term reliability and operational stability for critical process applications, particularly in power generation where system availability is essential.

Application Field

The Bailey 6637517A1 control module finds primary application in power generation facilities where Bailey control systems have been extensively deployed for turbine control, boiler management, and balance-of-plant automation. In fossil fuel power plants, the module is used for critical process monitoring and control applications including feedwater control, combustion management, and steam temperature control. Nuclear power facilities utilize the 6637517A1 for non-safety related control applications where its proven reliability contributes to overall plant availability and operational efficiency.

Process industries including chemical processing, petroleum refining, and pulp and paper manufacturing employ the Bailey 6637517A1 for various control applications where the robustness of Bailey systems provides operational advantages. Water and wastewater treatment facilities use these modules for process control applications where long-term reliability reduces maintenance requirements. The module’s compatibility with existing Bailey infrastructure makes it particularly valuable for facility modernization projects where gradual system upgrades are implemented while maintaining existing control architecture. Essentially, the Bailey 6637517A1 serves applications where proven reliability, backward compatibility, and long-term operational stability are more critical than the latest technological features.

6637517A1 BAILEY

Related Products

6637517A2: Enhanced version or alternative configuration

6637543A1: Complementary I/O module

6637544A1: Communication interface module

6637545A1: Processor module

6637546A1: Power supply module

6637547A1: Signal conditioning module

INFI-90: Bailey’s distributed control system platform

NETWORK-90: Previous generation control system