Unless you are getting oil out of the hose you do not need a seperator. Thinking it needs changing due to age, etc is a common misconception. Thing is most people mistakenly view it as a filter and think it's going to get dirty, etc,etc. However, it isn't a filter, it's simply an air maze designed to slow the air down, resulting in the entained oil dropping out. As long as air goes through it, and no oil is exiting the hose, it needs no attention. That said, even if there is some oil escaping, make sure the pickup tube that draws the oil from the seperator isn't kinked, clogged, etc or that will cause oil to build up and pass out with the air.
That said if you have the old one out already and decide tp put it back in insure one thing. That is there needs to be a couple of staples through both of the gaskets on the seperator element. The factory ones are usually heavy stapels and penetrate though the gaskets as wel as the flange. The main thing is that there is a definate metal to metal contact from the metal of the element to the metal of the seperator chamber. Without that contact for static electricity cause by the air flow to pass through a chance of fire exists within the seperator chamber caused by a static spark in what is essencially an flammible, vapor filled atmosphere. I've seen one old IR Gyroflow burned like this and it makes a real mess....
As far as the missing sensor, are you sure it's a pressure sensor and not a temp sensor? I ask because I work on alot of rotary screw, and vane compressors (ie IR Gyroflow vane types, Sullair, Atlas Copco, Gardner Denver, and IR rotary screw types)that range in age from around a few years old to more than 60 years old. Between all of them I have yet to run into one with a pressure sensor on the safety shutdown curcuit. The majority have a normally open low oil pressure switch on the engine that's bypassed by a 'bypass' switch when starting to allow oil prssure to rise and close it for normal operation. The other switches are normally closed and open when a fault occurs. They are usually on the engine water temp (set at 210 degrees rising) and in the oil/air flow on the compressor discharge side (usually set at 250 degrees, rising, on the ones I've seen). I really don't know why there would be a port with any type of pressure sensor in it designed to shut down the engine as I have never seen one with anything like that.
That said if it is a temp switch your needing take a look at Davidson Sales site. I've bought numerous NASON pressure and temp switches from them over the years for the compressors, and other machines, I've worked on. Often times the OEM switches were NASON and simply had the label removed so they could sell them for twice the price....
Good luck and I hope this helps. If you have any more questions or problems feel free ask.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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