Inclined Vertical Manometer

I may not understand your question fully so I just guest that you are open the port if that the case can you check to see if there is a leak ? another thing you can check with Dwyer manometer the ports can be closed seal ( there will be no reading of this happened ) you should fully open the ports (both side without leak).

Hope this may help

I have open ports, and there is no leak.... pitots tube are free of any material that could get clogged...still cant do the reading

I have used inclined manometers - not that specific brand, but they should all be much the same. I would persue two avenues to try to isolate the problem.

1) blow gently on the tubes to make sure the manomter liquid will rise and fall - this proves that there is no blockage anywhere. Blow into the pitot end port, then the side port - make sure both these actions cause the liquid to move.

2) from your estimate of air speed, calculate the approximate rise you would expect on the manometer - are you sure it will be a measurable amount? The formula is h = v^2/(2g) (Use a consistent units sytem)

If neither of these tests reveal where the problem lies, come back and describe more about the installation, eg air speed, what is the pitot measuring, where is it mounted.... etc.

We are a bit short of information here.

Which way do you point the total head port? It should point against the airflow direction. If the ductwork upstream of your sample point is not straight for 10 x maximum dimension of thr duct you will have difficulties getting a representative reading. If the ductwork is sufficiently complicated you may even get negative readings when you would expect positive ones due to back eddies. Pitot tubes are very sensitive to air flow direction.

Step 1) Assuming that you are working downstream of the fan: connect the high pressure port of the manometer to the total head port of the pitot tube. This is usually the one straight in line with the insertion length. Open both ports on the manomater fully. Blow gently into the total head port and check for a deflection. Assuming that you can deflect the levels go on to step 2. No deflection means a blockage

Step 2) Insert the pitot into the duct with the total head port facing against the airstream. If you do not get a measurable deflection then the air flow rate is too small to give an adequate total head pressure. If you get a deflection go to step 3. This is your total head reading.

Step 3) Connect the hose to the static head port of the pitot tube. This is usually the port at right angles to the insertion length. Blow down the hose and feel for air coming out of the ring of holes round the side of the sensing area of the pitot tube. No airflow = blockage.

Step 4) Connect the low pressure port on the manometer to the static head port of the pitot tube. Check for a deflection. This is your velocity head reading.

Step 5) Disconnect the hose from the total head port on the pitot tube and check for a deflection. This is your static head reading.

Have fun

It is not my intent to be negative; rather, the reverse. I know exactly how to fix ( and train you) on the Dwyer 400.

Re-write the E-mail in proper English. If that's no incentive, so be it- its causing big problems (language), particularly in technical fields ! Also, its life threatening: think Emergency Rooms.

Does anyone agree with me ?????

No, I don't agree with you Mr. Guest. It may surprise you to learn that not everyone on this earth speaks English as their mother tongue. An incredible number of those make an effort to learn a smattering of English so that they may communicate with us native English speakers. While their efforts may seem rather amusing or confusing to us sometimes, often we can make out what they mean, after a fashion. Very few English speakers ever learn very much of another language.

Why not be a big man and help our correspondent out since you profess to have the answers.

We said Frankston

Im from Costa Rica and stil is not my mother tongue I expect to have little respect for what Im trying to say i have spoke in english before and still today and it seems I Have made myself clear in english.... even in a spoken form..... I hope you get the chance to try to ask your concerns in perhaps....SPANISH,,,,,, you will find a lot of help in the way from our spanish and who knew our english partners....