This document describes the Field Sensitive Magnetic Proximity Cycle Switch, a device designed for use with MS & MH valve sections in professional applications.
Function Description
The Field Sensitive Magnetic Proximity Cycle Switch is an electrical switch that detects the cycling of a valve section by sensing a magnetic field. It is used to monitor the operational cycles of the valve, providing an electrical signal that can be integrated into control systems. The switch is installed in a piston chamber of the valve section. Depending on the existing configuration, it can be installed in an unoccupied piston chamber or replace an existing cycle indicator pin/switch. The device is designed for professional use, implying its application in industrial or specialized settings where precise cycle monitoring is required.
Important Technical Specifications
Part Numbers and Pressure Ratings:
- Part Nos. 557741, 557746, 558933:
- Maximum Working Pressure: 3500 psi (24 MPa, 241 bar)
- Part No. 557745:
- Maximum Working Pressure: 7500 psi (51.7 MPa, 517 bar)
Electrical Specifications (Series A):
- Current Rating (for 557745, 557746, 558933):
- 2A @ 120/240 VAC
- 0.5A @ 120/240 VDC (UL)
- Temperature Range: -22°F to 250°F (-30°C to 121°C)
- Approvals:
- UL Listed, CE
- Approved for Hazardous Locations: Class I, Groups A, B, C, & D - Division 1; Class II, Groups E, F, & G - Division 1; Class III
Electrical Specifications (Series B):
- Current Rating (for 557745, 557746, 558933):
- 2A @ 240 VAC
- 4A @ 110 VAC
- 3A @ 24 VDC
- Temperature Range: -40°F to 212°F (-40°C to 100°C)
- Approvals:
- UL Listed, CE
- Approved for Hazardous Locations: Class I, Groups A, B, C, & D - Division 1 & 2; Class II, Groups E, F, & G - Division 1 & 2; Class III Division 1 & 2
Other Specifications:
- Switch Type: Normally open contacts
- Maximum Cycle Rate: 125 cycles/min.
- Material:
- Switch: Stainless steel
- Adapter: Nickel plated steel
Wiring Codes:
- For 3-Pin Models (557741):
- A - Ground
- B - Common (Power)
- C - N/O (Normally Open)
- For 5-Pin Models (557746):
- A - White = N/O
- B - Red = Not Used
- C - Green = Ground
- D - Orange = Not Used
- E - Black = Common (Power)
- For 3-Pin Flying Lead Models (557745 Series B and Earlier, 558933 Series A):
- Red = Ground
- Black = Common (Power)
- White = N/O
- For 3-Pin Flying Lead Models (557745 Series C and 558933 Series B and Later):
- Green = Ground
- Brown = Common (Power)
- White = N/O
Usage Features
Installation:
The switch can be installed in valve sections not originally equipped with a cycle pin indicator/switch, or in valve sections already equipped with one.
- For new installations (Method A): The switch is installed in any piston chamber not occupied by a cycle pin indicator. This involves removing the piston plug, installing the proximity switch with a supplied seal/gasket, and then making the electrical connection. Torque specifications for installation vary based on valve section type (MS, MH, MX, MGO) and seal type (o-ring or gasket).
- For replacing an existing cycle indicator pin/switch (Method B): This involves removing the existing indicator, reversing the piston so the proximity switch senses the slot end, and then installing the new proximity switch with the appropriate torque.
- Grounding: The equipment must be properly grounded to prevent static and electric shock. All electrical wiring should be performed by a qualified electrician in compliance with local codes.
- Pressure Relief: Before any installation or servicing, the pressure in the system must be relieved according to the pump instruction manual.
- Electrical Connection: A "Brad Harrison" style connector cable is required for proper electrical connections. Specific part numbers for 3-pin and 5-pin cables are provided, along with their respective wiring codes.
Safety Warnings:
- Electric Shock Hazard: Emphasizes the need for proper grounding, disconnecting power before servicing, connecting to grounded power sources, and having wiring done by qualified electricians.
- Equipment Misuse Hazard: Warns against operating while fatigued or under influence, exceeding pressure/temperature ratings, using incompatible fluids, altering equipment, using non-genuine parts, and improper routing of hoses/cables.
- Skin Injection Hazard: Highlights the danger of high-pressure fluid injection and stresses the importance of immediate surgical treatment for such injuries. Users are advised not to point dispensing devices at anyone, cover outlets with hands, or stop leaks with body parts. Pressure relief procedures must be followed, and all fluid connections tightened.
Maintenance Features
General Maintenance:
- Daily Checks: Equipment should be checked daily for worn or damaged parts, which must be immediately repaired or replaced with genuine manufacturer's parts.
- Gasket Replacement: If the switch is removed for any reason, the gasket must be replaced with a new one (Part No. 557717) to ensure proper sealing and prevent leaks.
- Torque Specifications: Adhering to specified torque values during installation is crucial to prevent switch failure. Over-torquing is explicitly warned against.
- Hose and Coupling Checks: Hoses and couplings should be checked daily, and worn or damaged parts replaced immediately.
End of Product Life:
- Dismantling and Recycling: At the end of its useful life, the product should be dismantled and recycled responsibly.
- Pressure Relief: Before disposal, the system pressure must be relieved.
- Fluid Disposal: Fluids should be drained and disposed of according to applicable regulations, referring to the material manufacturer's Safety Data Sheet.
- Recycling Facility: The remaining product should be delivered to a recycling facility.
Warranty:
Graco provides a standard 12-month warranty against defects in material and workmanship, provided the equipment is installed, operated, and maintained according to Graco's recommendations. The warranty does not cover general wear and tear, misuse, alterations, or damage from incompatible parts.
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