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I know that one foot of water column equals 0.433 psi. So about 70 feet of
2" pipe attached to the side of a tall building with a thin diaphragm over
a chamber with a Schrader valve should get you close. Might need to make a
manometer out of it, so you'll need more pipe.
It's low cost, but not very practical. I did have a set of weights and an
oil reservoir for calibrating liquid pressure, but liquids are not (for our
purposes) compressible and air is. So I don't know how accurate that might
be.
If you had some mercury, a 5 foot column should do the trick. Don't tell
the EPD, though.
On Sun, Apr 7, 2024, 15:37 Benjamin Zwissler <bjzwissler@gmail.com> wrote:
> I calibrate my Milton (which has consistently read high) to my wife's tpm=
s
> value. Partly because I assume the car is right and partly because I
> don't like it when she's telling me a week later that she's getting low
> pressure lights again.
>
> I don't know how to create an inexpensive standard for calibration. The
> Milton is the most expensive gauge I have and has been the least accurate=
.
> I looked it up on line and found lots of similar complaints about its
> inaccuracy.
>
> Any ideas on creating a low cost pressure standard for calibration?
>
> Ben
>
>
>
>
> On Sun, Apr 7, 2024, 1:49=E2=80=AFPM Jeff Scarbrough <fishplate@gmail.com=
> wrote:
>
>> So, I have three tire gauges: Accutire electronic, Jayco mechanical, an=
d
>> Milton Inflator hose with gauge. All three report consistently, and all
>> three are 3-4 psi different - low to high in the above order.
>>
>> Is there a simple way to check accuracy?
>>
>> Jeff
>> Corrosion Acres, Ga.
>> _______________________________________________
>>
>> Shop-talk@autox.team.net
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<div dir=3D"auto">I know that one foot of water column equals 0.433 psi.=C2=
=A0 So about 70 feet of 2" pipe attached to the side of a tall buildin=
g with a thin diaphragm over a chamber with a Schrader valve should get you=
close.=C2=A0 Might need to make a manometer out of it, so you'll need =
more pipe.<div dir=3D"auto"><br></div><div dir=3D"auto">It's low cost, =
but not very practical.=C2=A0 =C2=A0I did have a set of weights and an oil =
reservoir for calibrating liquid pressure, but liquids are not (for our pur=
poses) compressible and air is.=C2=A0 So I don't know how accurate that=
might be.</div><div dir=3D"auto"><br></div><div dir=3D"auto">If you had so=
me mercury, a 5 foot column should do the trick.=C2=A0 Don't tell the E=
PD, though.</div><div dir=3D"auto"><br></div><br><br><div class=3D"gmail_qu=
ote" dir=3D"auto"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Apr 7, 2024=
, 15:37 Benjamin Zwissler <<a href=3D"mailto:bjzwissler@gmail.com";>bjzwi=
ssler@gmail.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div=
dir=3D"auto"><div>I calibrate my Milton (which has consistently read high)=
to my wife's tpms value.=C2=A0 =C2=A0Partly because I assume the car i=
s right and partly because I don't like it when she's telling me a =
week later that she's getting low pressure lights again.=C2=A0<div dir=
=3D"auto"><br></div><div dir=3D"auto">I don't know how to create an ine=
xpensive standard for calibration.=C2=A0 =C2=A0The Milton is the most expen=
sive gauge I have and has been the least accurate. I looked it up on line a=
nd found lots of similar complaints about its inaccuracy.=C2=A0</div><div d=
ir=3D"auto"><br></div><div dir=3D"auto">Any ideas on creating a low cost pr=
essure standard for calibration?</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Ben=C2=A0<br><div dir=3D"auto"><br></div><div dir=3D"auto"><br></=
div></div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmai=
l_attr">On Sun, Apr 7, 2024, 1:49=E2=80=AFPM Jeff Scarbrough <<a href=3D=
"mailto:fishplate@gmail.com"; target=3D"_blank" rel=3D"noreferrer">fishplate=
@gmail.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=
=3D"ltr">So, I have three tire gauges:=C2=A0 Accutire electronic, Jayco mec=
hanical, and Milton Inflator hose with gauge.=C2=A0 All three report consis=
tently, and=C2=A0all three are 3-4 psi different - low to high in the above=
order.<br><br>Is there a simple way to check accuracy?=C2=A0=C2=A0<div><br=
></div><div>=C2=A0 =C2=A0 Jeff=C2=A0<div>=C2=A0 =C2=A0 Corrosion Acres, Ga.=
</div></div></div>
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</blockquote></div></div></div>
</blockquote></div></div>
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