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Manometers
tommyoil
Member Posts: 612
Can someone suggest a decent/durable manometer. Are they all pretty much the same?? I dont want junk. Thanks in advance for any help/suggestions.
Tommy
Tommy
0
Comments
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Richie brand,
tube within a tube.gwgillplumbingandheating.com
Serving Cleveland's eastern suburbs from Cleveland Heights down to Cuyahoga Falls.0 -
Dwyer
I have a Dwyer slack tube manometer tha I bought 42 yrs. ago still works fine. Cheap, accurate. The only problem with water manometers is they freeze in your truck. bob0 -
Fill them with widshield washer
> I have a Dwyer slack tube manometer tha I bought
> 42 yrs. ago still works fine. Cheap, accurate.
> The only problem with water manometers is they
> freeze in your truck. bob
0 -
Fill them
with widshield washer antifreeze0 -
Digital, UEI
But I found out that my Field Piece multi meter has manometer/static pressure adapter as well as other cool attachments. Nice addition.0 -
Digital
meters won't accurately work below zero F. However, being an enterprising outdoors kinda guy ..... I put my UEI in a mit with one of those hand warming packs and voila my meter is warm as toast.0 -
Inexpensive, Dwyer Model 1227 Combo Vertical and inclined manometer.
Better quality, Dwyer Magneheilic gauge of the appropriate range. Unfotunatly this may require more than one gauge depending on pressures being read.
Ultimate manometer Dwyer 477-FM series 0 to 19.99" range. Can also be purchased as a kit with a pitot tube, static pressure tips, and a air velocity calculator (slide rule).0 -
Maybe
Dropping the digital meter in a vat of antifreeze would work as well?? Maybe in a zip loc bag?0 -
You sure about that, Boiler guy?
> with widshield washer antifreeze
0 -
I've been using magnehelics ever since my first u-tube freeze-up. I carry a 0-5", a 0-10", and a Ritchie gage for 0-35". Perfect for checking gas pressures, static pressures, and for checking pressure switches.0 -
Windshield washer
fluid wouldn't be accurate. different density.0 -
testo
I've been happy with my testo digital manometer. Easy to use and accurate.
To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"0 -
Bob
According to my test procedure the difference is about .005"WC. Not enough to be a concern0 -
Great tool
I've got em too but kinda pricey for the average service tech. Also they DO NOT like being banged around in a service truck0 -
antifreeze
antifreeze
Different density to water, will cause an error. I don't know how much of an error without looking up densities.
PS Bob said it first & I didn't notice.0 -
Yes, but
But that gauge has a zero error of about 2.96" w.g.! ;-)0 -
Manometers- The only tool that will never lie.0 -
Aidan
Windshield Washer Afreeze is mostly water any way. Very little difference from straight water0 -
Manometer is most
accurate when used with only water.Do not leave water in the unit it will freeze. Fill it each time you are going to use it. My two plastic dwyer manometers (40 years old) have outlasted every magnehelic and other guage.
As for using different fluids I ran tests when I was with the gas company and anything other than water or the fluid sent with the gauge is going to give you incorrect readings as the viscosity of other fluids is different than water. If I can find the test results in my library I will post them here.0 -
Here are my test results
ACCURACY OF PRESSURE READING
OR
YOU AND YOUR U GAUGE
One of the most accurate and convenient means for measuring low-pressure is the Water Manometer (U Gauge). The pressure reading is stated in "inches of water column" (W.C.). The pressure in our low-pressure distribution system usually is set between 7 and 10 in. W.C.
When checking or adjusting pressures in our low-pressure system, the Water Manometer is usually used. The accuracy of the reading taken is dependent on the fluid in the manometer. For example, if the pressure is to be stated in inches of water column (W.C.), water must be used as the fluid in the manometer. Different fluids or a combination of fluids will change the accuracy of the measurement.
Testing was done to determine the effect of using different fluids in a manometer. With the known pressure source different fluids were used and measurements recorded.
Materials Used
1 Manometer, part No. 1225-12
1 Sprague B3regulator 3/4" x 3/4", 1/8" orifice
Tap water
Alcohol
Bristol chart ink (red) No. 382476-16-8
Test Data
SOURCE PRESSURE 7.0" W. C. for all testing.
WITH JUST WATER pressure recorded 7.0 W.C.
WITH ALCOHOL pressure recorded 8.7" W.C.
WITH A MIX OF 1" Chart ink, 11" alcohol,
pressure recorded 8.2" W.C.
WITH A MIX 9" tap water, 6" Alcohol, 2" chart ink
pressure recorded 7.2" W.C.
So What Does This Mean?
To be sure the measurement of pressure is correct when using a water manometer, the fluid in the manometer must be water or a fluid with the same specific gravity of water.0 -
WW Anti freeze
You posted:
WITH A MIX 9" tap water, 6" Alcohol, 2" chart ink
pressure recorded 7.2" W.C.
Using -30F rated windshield washer antifreeze
pressure recorded 7.05" W.C.
Disclaimer: While the density of the product used may differ from one manufacturer to another, the product I used for MY TEST was extremely close to water density.
For ABSOLUTE accuracy Tim you are TOTALLY correct
This is exactly the same principle as using a meter ALWAYS CHECK AGAINST A KNOWN SOURCE BEFORE USING !0
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