The 632-36501-1, designated EDWE-3, is an end-of-line pressure switch unit for dual-line (two-line) centralized lubrication systems. It sits at the remote end of a pressurized main line and confirms that pressure has developed there, so the controller can complete the line phase and command changeover. This page covers the aftermarket-compatible unit supplied by IsoHiTech that replaces the Lincoln unit of the same part number.
If your parts list shows AI36501, this is the same 632-36501-1 EDWE-3 end-of-line pressure switch — order by either number.
IsoHiTech supplies aftermarket-compatible components. Brand names are used for compatibility reference only. IsoHiTech is not an authorized OEM dealer.
What the Unit Does in a Dual-Line System
A dual-line system works in alternating phases: the pump pressurizes one main line while the other vents, then changes over. The end-of-line unit is the confirmation device in that loop: when it signals pressure at the remote end of the line, the controller completes the line phase and commands changeover; if the signal does not arrive in time, a fault is raised. The pump side is covered on the grease pump pages and the electric grease pump range, with system behavior in the guide to grease pumps.
Version and Sibling Configuration
Part number 632-36501-1 is the version with limit switches and pressure gauges. A separate electronic version with an LED display exists as 632-36627-3, a different configuration quoted separately. For electronic switching units, see the DS-EP-40-D-2 electronic pressure switch page.
Honest Specification Summary
- Part number: 632-36501-1; designation: EDWE-3
- Function: end-of-line pressure confirmation in dual-line (two-line) centralized lubrication systems
- Version: limit switches and pressure gauges
- Main-line connection of the unit it replaces: G1/4 male – verify against your installation before ordering
- Pressure range: the EDW family is associated with a 0-600 bar range; treat this as the family envelope, not a promise about every installation
Electrical details, enclosure rating, and set-point configuration are confirmed against the controller and installation when quoting; we do not publish unverified ratings, price, or lead time on this page.
Controller Compatibility Checklist
Before ordering, confirm four things against your controller documentation: the expected contact arrangement (normally open or normally closed), the input type (dry contact), the contact switching capacity, and the timing window allowed for line pressurization. A normally open contact closes when pressure develops; a normally closed contact opens – the controller logic decides which is correct. If in doubt, send the controller model with your inquiry.
Where It Is Not Used
This is a dual-line end-of-line device. Progressive systems confirm cycles with a cycle switch on the divider valve, not an end-of-line pressure unit; see the progressive lubrication systems page. And the unit supplied here is not the original manufacturer’s unit – it is an aftermarket-compatible equivalent.
When asking for a quote, send the part number being replaced, the controller model, the system working pressure, and photos of the label and wiring, via contact us for a quote.
Frequently Asked Questions
What is the 632-36501-1 (EDWE-3)?
An end-of-line pressure switch unit for dual-line centralized lubrication systems. On this page it is the aftermarket-compatible equivalent supplied by IsoHiTech that replaces the Lincoln unit of that part number.
Is this a genuine Lincoln unit?
No. It is an aftermarket-compatible equivalent supplied by IsoHiTech. The brand name identifies what the unit fits and replaces; it is not the original manufacturer’s unit.
What does an end-of-line pressure switch do in a dual-line system?
It confirms that the pressurized main line has developed pressure at its remote end. On that signal the controller completes the line phase and changes over to the second line; if the signal does not arrive in time, the controller raises a fault.
What is the difference between this and the electronic version?
This part number is the version with limit switches and pressure gauges. The electronic version with an LED display is a separate configuration under part number 632-36627-3, quoted separately.
Will it work with my controller?
Verify against your controller documentation: contact arrangement (normally open or normally closed), input type (dry contact), switching capacity, and pressurization timing window. Send the controller model if in doubt.
Where in the system is it installed?
At the end of the monitored main line, on the G1/4 male connection of the original unit. Confirm the port on your installation before ordering.
Should the contact be NO or NC?
It depends on the controller logic. A normally open contact closes when pressure develops; a normally closed contact opens on pressure. Check which signal your controller expects.
Can it confirm cycles in a progressive system?
No. Progressive systems use a cycle switch on the divider valve to confirm movement; an end-of-line pressure unit belongs to dual-line systems. See the progressive lubrication systems page.
What should I send when asking for a quote?
The part number being replaced, the controller model, the system working pressure, and photos of the label and wiring – send them via contact us for a quote.
Related Pages
- DS-EP-40-D-2 electronic pressure switch
- Progressive lubrication systems
- Grease pump
- Electric grease pump
- Guide to grease pumps
Dual-line confirmation starts at the pump and ends at this unit; send your part number and controller model for a matched quote.
Is AI36501 the same as 632-36501-1?
Yes — AI36501 is the short form used in many parts lists for the 632-36501-1 EDWE-3 pressure switch. Same switch, same end-of-line function for dual-line systems.
