Question on the Digital Manometer

[TheDuke]

I was looking into upgrading to a new digital Manometer one reason is
there is a new universal pressure switch that you adjust with a small allen wrench you can set them from one too four W.C. OR From a 1/4 to 1 W.C.
plus all the other features.
My Question is do these create there own vacuum to check a pressure switch for the correct negitive pressure

Here is one I am looking at
http://www.transcat.com/Catalog/productdetail.aspx?itemnum=95520PR

[TheDuke]

well if they don't make one that can do that, maybe I should invent one

[1972torino]

http://www.ueitest.com/product-em200.html

works great!!

[dec]

My Question is do these create there own vacuum to check a pressure switch for the correct negitive pressure

Here is one I am looking at
http://www.transcat.com/Catalog/productdetail.aspx?itemnum=95520PR

I dont own that one but not saying I havnt noticed then at some of the distributors ........ I have thought about buying one but havnt.

To set those adjustable pressure switches , you will tie in a T with a short piece of tubing and suck on it to get your negative pressure reading on the gauge. When you hear the click of the air switch .........that reading on the gauge is where it is set at, at the time. Same as you would using a magnehelic , if you have used one.


They we all get to tell you how YOU SUCK :D

[1972torino]

the way i check for pressure switch operation is to hook the manometer in-line with the pressure switch and while the inducer is running i slowy restrict the line at the hx. this tells me the pressure the switch closes and opens at. to close off the line i use a little hose clamp shaped live a vise, that way i can better control the vacuum the switch is getting.

[1972torino]

this is what i was talking about...
http://cgi.ebay.com/ebaymotors/Fuel-Fluid-Line-Radiator-Hose-Clamp-Pinch-Off-Tool-Set_W0QQcmdZViewItemQQ_trksidZp1638Q2em118QQcatego ryZ35625QQihZ019QQitemZ290188052861QQrdZ1QQsspagen ameZWD1V

[Tom R]

I use a Mityvac hand pump in conjunction with a magnahelic to test and set those pressure switches.

The Mityvac will pump down to about 25" or pump up to about 25PSIG of pressure, they can be bought at any major automotive parts place and with some hose, tees and adapters can be used on about any type of pressure switch and measured with most any type of manometer.

[Twilly]

Twilli says whats a manometer just adjust the gas pressure till the limit trips ans then back it off a bit.

[TheDuke]

http://www.ueitest.com/product-em200.html

works great!!
Just went out today and bought the EM200
JOHNSTONE HAD IT

[mark beiser]

Don't buy the UEI manometer. It is not capable of taking draft readings, and 1.5% full scale accuracy isn't that great. Ok for gas input pressures, but a bit to high for my taste for manifold pressures, and downright horrid for airflow diagnostics.
On an instrument with a 20" WC scale, the reading could be off by 0.3" WC, and still be within the design tolerance of the instrument! :eek:

For just a little bit more you can get a Testo 510 that has the accuracy, resolution, and range of scale to do everything from draft readings to checking gas pressures, including checking pressure switches.
It even has enough resolution and the correct scale to do some rough checking of building pressure differentials, it won't replace a micromanometer for that though.

http://www.testo.us/online/abaxx-?$part=PORTAL.USA.Applications&$event=show-from-content&externalid=opencms:/Products/MeasurementParameters/pressure/Druckmessgeraete/testo_510/Englisch.product

Just for comparison, at the pressures you would typically see for setting most pressure switches, in the 0.5 to 1.0" range, the design accuracy of the UEI meter would be +/- 0.3" WC from the actual pressure.
The Testo 510 would be +/- 0.0475 to 0.055" WC.

[jrbenny]

Testo 510. Great manometer. Have one in the truck. It's fast. It's not bouncy like a magnahelic. Much easier to use with the magnet on the back of it.

[KLEINman]

I just recently bought a uei em200. My friend has the testo 510 and we tested both on the same system for static pressure. When we took the readings they were almost exactly the same, to me its all personal preference but i believe they are both just as good. Although i do like the size of the testo compared to the clunkyness of the uei.

[beenthere]

I just recently bought a uei em200. My friend has the testo 510 and we tested both on the same system for static pressure. When we took the readings they were almost exactly the same, to me its all personal preference but i believe they are both just as good. Although i do like the size of the testo compared to the clunkyness of the uei.
Not to beat up on brands.

But, if you had been doing a VP check. How far off would the 2 VP readings be.

[mark beiser]

to me its all personal preference but i believe they are both just as good.

Just look at the accuracy rating of the UEI. It's margin of error, that is still within the accuracy rating of the instrument, is HUGE for the kinds of pressures we deal with when doing airflow diagnostics.
IMO, the UEI manometers accuracy rating makes it to untrustworthy to be useful as anything but a paper weight.