Looking for a High-Accuracy Turbine Flowmeter

Accuracy of turbine flow meters is limited better use a gear flow meter which after calibration can meet your requirements.

Riot,

You may not need accuracy as much as you need repeatability. Try another search, but this time, look for repeatability rather than accuracy and see if the numbers don't come closer. There are more accurate types of meters, but you will find that as you get extreme accuracy you begin to pay a considerable penalty in price, pressure drop and durability.

LG_DAVE

Hi Riot

Have you tried Hydrotechnik? They are as good as I've found (after they have given you a calibration cert for programming the offsets into a data logger). You will also need one meter of straight pipe on either side of the turbine (to induce laminar flow)!

They have a branch at Nottingham UK with the main factory in Germany.

If the device is going to be permanently fitted, you will need a filter down stream to catch the turbine bits when it spits it's guts into something important.

Depending on the usage repeatability can or cannot be main parameter. If the flowmeter is used as volume or flow measuring device uncertainty (global ie lack of accuracy+repeatability) are requested.

If one has the possibility to calibrate the device on site then repeatability can be sufficient.

I used the Hydrotechnik which are good within the prescribed limits. Turbines being function of flow impact (velocity) are limited in accuracy at low flow values.

It is good practice to protect the rotor from the impact of parts carried by the flow (accidentally) since its bearings can be harmed and friction increased which reduces accuracy.

look at these guys. They are the leaders in oil and gas metering.

http://www.emersonprocess.com/daniel/products/liquid/turbine/ptliquidm/Ds_Sheets/Parity%20Turbine%20Meter%20sizes%203in-16in%20205KB.pdf

http://www.emersonprocess.com/daniel/products/liquid/turbine/ptliquidm/Ds_Sheets/UMB%20Turbine%20Meters%203in-16in%20196KB.pdf

http://www.emersonprocess.com/daniel/products/liquid/usonic/Model%203804%20Liquid%20Ultrasonic/Ds_Sheets/Liq_USM_DS.pdf

And the best will be :

http://www.emersonprocess.com/micromotion/products/sensors-ELITE.html

You may not find equipment with accuracy of .025% of full scale. And you will hardly find anybody who would commit to this accuracy because there may not be any calibration facility that have suitable testing equipment to guaranty overall accuracy of one third of your required accuracy (normal rule used for calibration).