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Path: utzoo!watmath!clyde!burl!ulysses!allegra!princeton!astrovax!biomed!lagasse
From: lagasse@biomed.UUCP (Robert C. Lagasse)
Newsgroups: net.rec.boat
Subject: water switch REPLY
Message-ID: <69@biomed.UUCP>
Date: Wed, 22-May-85 17:26:16 EDT
Article-I.D.: biomed.69
Posted: Wed May 22 17:26:16 1985
Date-Received: Thu, 23-May-85 04:42:53 EDT
Organization: Mass. Gen. Hosp. - Dept. Biomed. Engineering
Lines: 31

Reply to Jim Seavey @ Pacific Bell , San Francisco:

        Parts list for pressure switch installation:     
1-Tee connector for 3/16" ID hose x 3/16" ID hose x 1/8" ID hose
1-24" lenght of 1/8" ID rubber hose (auto vacuum line)
2-Slide-on crimp terminals, female, 1/4"
1-lenght of 2 cond. wire from engine to dashboard (or single cond. if you
ground one side of the switch to the engine).
1-pressure switch , Herga model #6731-06 or #6731-10
Misc.- Piezo buzzer, 12v pilot light, crimp terminals, wire ties, etc.

For OMC: Find the 3/16" hose running to the water indicator (pisshole), cut
it near the indicator and insert the tee inline using the 3/16" ends. Next,
connect the 1/8" hose from the 1/8" tee connector to the input port on the
pressure switch.  Mount the pressure switch up high so water will not try to
collect in it.  The switch has a nylon body and is featherweight so you can
just glue it to something plastic with a good contact adhesive or
cyanoacrylate.  The pressure switch has a recessed screw which provides a
nice linear adjustment.  The switch which I used was the #6731-06 which has
a pressure range of 0.2-1.7 PSI.  You might want to try #6731-10 which is
0.75-2 PSI as I did not get the full adjustment range I expected since the
engine idle pressure is higher than what I thought it would be. I will
probably change to the #6731-10 eventually.  These switches have neoprene
diaphragms and the actual switching mechanism is a "microswitch" that has
SPDT (form C) contacts. Order the switch from:
                Pres Air Trol
                895 Mamaroneck Ave
                Mamaronect, N.Y.  10543
                (914)698-2026
   Good Luck!  Would like to hear about any results!
Bob Lagasse  biomed whj12