Inches of water

Sean Technician Ohio Posted   Latest   Edited  

my question was what does a good reading of inches of water on the scope. I've seen some say the wps but I can't seem to figure that out. I assumed you can make a custom probe on the pico, but what's the conversion, volts=inches of water. Or just keep practicing trial and error. 

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Eric Owner/Technician
Wisconsin
Eric Default
 

Inches of mercury.

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Sean Technician
Ohio
Sean Default
 

Thanks had no idea my question never uploaded.

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Marlin Technician
Oregon
Marlin Default
 

Kilopascals

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Hans Diagnostician
Utah
Hans Default
 

I’ll see if I can try it out tomorrow and compare to my manometer.

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Matt Owner
North Carolina
Matt Default
 

The WPS will read pressure of roughly 2:1 where -1psi=2 inches of mercury. The conversion for inches of mercury to inches of water is 13.6:1. So for quick conversations multiply scope pressure measurements by 2 to get inches of mercury and then multiply that measurement by 13.6 to convert to inches of water.

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Sean Technician
Ohio
Sean Default
 

Yea that's what I figured, but I have seen screenshots of inches of water as the display.

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Ronald Mechanic
Alabama
Ronald Default
 

I use a manometer that measures inches of water. Most crankcase systems on euro run 5-7 inches of water but some bmw are higher. If you approach a psi reading like on a vacuum gauge that reads mercury then you have diaphragm ruptured or such which will impact many systems,fuel trim,map readings etc. If you have alldata you can find several bulletins and charts on bmw that will help guide you. I…

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Sean Technician
Ohio
Sean Default
 

Yea I'm not sure I would ever really run into an issue of, thisis the test I need. But if i would it would be nice to have

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Ronald Mechanic
Alabama
Ronald Default
 

Sorry,did not read careful enough​.​You were asking about displaying on scope.

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Dmitriy Analyst
Ontario
Dmitriy Default
 

Sean, this post explains why you see screenshots with inches of water sometimes: diag​.​net/msg/m2r7j23n2e… However, as a math guy, I can’t recommend juggling multiple units of measurement for the same thing (pressure) inside scope software, so I’m uncomfortable with describing how to create such custom probes...

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