Leeds & Northrup 6432-5-4117-506-3-20 Electromax controller

Product Description

Leeds & Northrup 6432-5-4117-506-3-20 Electromax Controller

This used Leeds & Northrup Electromax controller is a precision industrial process controller designed for temperature, pressure, flow, and other process variables. Leeds & Northrup (L&N) was a legendary manufacturer of scientific instruments and industrial controls, known for quality and reliability.

About Leeds & Northrup :

Leeds & Northrup (founded 1899, acquired by General Signal and later Honeywell) was a premier American manufacturer of precision scientific and industrial instrumentation. Their Electromax series controllers were widely used in industrial process control applications throughout the mid-to-late 20th century. The company’s instruments were known for their accuracy, rugged construction, and innovative design, including the development of the Speedomax line of recorders and controllers .

Key Features & Specifications :

Part Number Decoding (Based on L&N Conventions) :

• 6432: Basic model series (Electromax controller)

• 5: Likely input type / range code

• 4117: Output / control configuration

• 506: [Unknown – possibly power supply, options, or special calibration]

• 3-20: [Unknown – possibly output range (3-20 mA?) or auxiliary contacts]

Typical Electromax Features (based on Electromax III/IV documentation) :

• Current-Adjusting Type (DAT) : Provides 4-20 mA or 10-50 mA output for controlling electric valve positioners, power regulators, and transducers

• Position-Adjusting Type (PAT) : Provides relay outputs for motor-driven valves or contactors

• Dual-Input Capability: Some models accept both process variable and remote setpoint signals

• Alarm Options: High/low alarms with relay outputs

• Isolated Inputs: For thermocouple and RTD applications

• Plug-In Construction: Modular design for easy maintenance

Condition:

SOLD AS IS
USED – SHOWS NORMAL INDUSTRIAL WEAR (scuffs, panel marks, paint wear)
UNTESTED – CONTROL FUNCTION NOT VERIFIED
NO MANUAL OR DOCUMENTATION INCLUDED
POWER REQUIREMENTS UNKNOWN (likely 120V AC or 240V AC)
PICTURE MAY NOT MATCH PRODUCT

Potential Applications:

• Replacement controller for existing L&N systems in industrial plants

• Industrial process automation projects

• Vintage instrumentation collection/museum display

• Parts salvage for Leeds & Northrup equipment repair

• Educational demonstration of industrial control technology

• Restoration project for vintage industrial equipment enthusiasts