The GRACO 558938 is a field sensitive magnetic proximity cycle switch designed for use with MXP, MX, and MXO divider valves. It is constructed with an aluminum housing and features a magnetic sensing mechanism to detect the movement of the divider valve’s piston. Its primary function is to provide a signal to a monitor, controller, or PLC to indicate the number of cycles and cycle rate of the lubrication system, ensuring accurate monitoring and feedback for automated lubrication processes.

Key Features:

• Field Sensitive Magnetic Proximity Cycle Switch
• 558938
• Aluminum housing, magnetic sensing mechanism
• Up to 10,000 psi (690 bar) for some series; up to 8,000 psi (552 bar) for others (see documentation for specific application)
• MXP, MX, and MXO divider valves; all series progressive families
• Magnetically operated, single-throw switch
• Senses movement of divider valve piston
• Provides feedback for cycle monitoring
• Available in 115 VAC or 12-32 VDC versions
• Cycle rates up to 200 cycles per minute (CPM)
• 5-pin Brad Harrison (BH) Mini connector
• Reliable for high-pressure and high-cycle applications

Applications:
Used in automated lubrication systems to monitor and record the cycle rate and status of divider valves, ensuring proper lubrication in industrial equipment such as mining, manufacturing, and agricultural machinery.

Installation Notes:

• Using genuine GRACO parts ensures compatibility, reliability, and optimal performance of the lubrication system.
• Ensure power is disconnected before installation
• Verify compatibility with the specific divider valve model
• Follow all safety instructions in the GRACO manual
• Check for proper alignment and secure mounting
• Test the switch after installation to confirm correct operation
• Regularly inspect for physical damage or wear
• Ensure electrical connections remain clean and secure
• Monitor cycle indicator lights (if equipped) for proper operation
• Replace the switch if erratic behavior or failure is detected