The Westinghouse Hagan 127-113, also identified by part number 4111513-G01, is a precision analog function generator module designed for legacy industrial control systems. Originally developed by the Hagan Controls division of Westinghouse, this unit is a staple in boiler control and combustion optimization. It serves as a signal conditioning component that modifies an input signal according to a specific mathematical function to produce a standardized 4-20mA output, ensuring accurate control of final drive elements like valves and dampers.

 

Technical Description & Parameters

This module is part of the Hagan 100 series of electronic controls, known for their high reliability in high-heat and high-vibration power plant environments.

• Model Number: 127-113 (4111513-G01)
• Device Type: Analog Function Generator / Signal Characterizer
• Input Signal: Typically 1-5V DC or 4-20mA DC (Internal jumper configurable)
• Output Signal: 4-20mA DC (Standard industrial current loop)
• Power Requirements: 24V DC or 117V AC (Depending on the specific rack/backplane configuration)
• Mounting: Plug-in card for Hagan standard 19-inch racks
• Adjustments: Front-panel potentiometers for Zero, Span, and Slope (Function) characterization
• Enclosure: Open-frame PCB with metal front faceplate

 

Product Datasheet Essentials

The 127-113 function generator is used to “linearize” non-linear process variables. For example, in combustion control, the relationship between a damper position and actual airflow is rarely linear; this module allows engineers to program a specific curve so that a 50% control signal results in 50% actual process flow. The 4111513-G01 revision features upgraded solid-state components compared to early-generation Hagan cards, providing better thermal stability and reduced signal drift over long periods of operation.

 

Country of Origin

USA (Westinghouse Electric Corporation / Hagan Controls)

 

Application Fields

The Hagan 127-113 is primarily found in heavy industrial and utility sectors:

• Power Generation: Boiler feed-water control and fuel-air ratio characterization.
• Steel Mills: Furnace pressure and temperature control loops.
• Chemical Processing: Characterizing non-linear valve actuators.
• Marine Engineering: Steam turbine propulsion control systems.

 

Product Usage Instructions

1. Installation: Insert the card into the designated slot of the Hagan rack. Ensure the gold-plated edge connectors are clean and free of oxidation.
2. Configuration: Before applying power, verify that the internal jumpers are set for your specific input signal type (Voltage vs. Current).
3. Calibration: Use a precision signal generator to apply the minimum input. Adjust the “Zero” potentiometer until the output is exactly 4.00mA. Apply the maximum input and adjust the “Span” to 20.00mA.
4. Characterization: Use the function-specific pots to define the “knee” or curve of the output signal as required by the process datasheet.
5. Monitoring: Use the test points on the front panel to measure the internal reference voltages without disconnecting the field wiring.

Common Questions & Answers (Q&A)

Q: Can this module replace a standard signal isolator? A: While it does provide isolation, its primary purpose is to change the signal’s relationship (Function Generation). If you only need a 1:1 signal transfer, a standard isolator is more cost-effective.

Q: What should I do if the output stays at 4mA regardless of the input? A: Check the input loop for a break. If the input is present, the internal operational amplifier or the output transistor may have failed. Hagan cards are often repairable at the component level.

Q: Is the 4111513-G01 compatible with modern PLC systems? A: Yes. Because it outputs a standard 4-20mA signal, it can be easily integrated into modern DCS or PLC analog input cards, allowing legacy Hagan field equipment to remain in service.

 

Explore More Industrial Logic Modules

For professional sourcing of the 4111513-G01 and other Westinghouse Hagan legacy components, visit our specialized spare parts inventory.

 

Recommended Similar Models

1. Hagan 127-111 – A basic signal buffer/isolator within the same family.
2. Hagan 127-154 – A PID controller module used in conjunction with function generators.
3. Hagan 127-115 – A square root extractor used for flow measurement.
4. 4111511-G01 – A variation of the signal conditioner with different gain characteristics.
5. Bailey 7000 Series – A contemporary analog control system often found in similar vintage plants.