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VERiS Verabar

Advanced DP Flow Measurement Technology

From Veris Research...True Performance in DP Flow Measurement

In God We Trust-

The Most Accurate and Reliable

Technology for Measuring Gas, Liquid and Steam

All Others Bring Data

The unique and exclusive breakthrough in improved accuracy

Developed from aerospace technology, the Verabar averaging pitot flow sensor provides

derived from the development of a verified theoretical model

predicts the Verabar flow

unsurpassed accuracy and reliability. With its solid one-piece construction

coefficients. This eliminates the need for

and bullet shape, the Verabar makes flow measurement

calibration tests to characterize the

clog-free and precise.

The unique sensor shape reduces drag and flow

flow coefficients.

Induced vibration. And the location of the low

Without such a model, the uncertainty of the flow

pressure ports elimi-

coefficients is dramatically increased and expensive

nates the

potential for clogging

calibration may be required.

and improves signal stability.

Empirical test data from independent laboratories verified the theore-

Superior Signal Stability

and Greater Resistance to Clogging

tical model and flow coefficients as a constant, Independent of Reynolds number and within ±0.5% of the predicted value. The derivation of the theoretical model and test data is published In the Verabar Flow Test Report (ED-100).

Clogging can occur In low pressure ports located in or near the partial vacuum

at the rear of the sensor. The Verabar design locates the low pressure ports -on the sides of the sensor, forward of the fluid

separation point and turbulent wake area. This virtually eliminates clogging

Test Data Summary


a Air Tests

^ Water Tests
_ _ _ 0.5 Percen - - - Error Banc			± ¹/2 Percent I
			...A....
	_A	a o		á
		*a___A..***		.^a...
			.........
			i

and produces an extremely

TD -

stable signal.

-1%

l -2%

-3%

10% 15%

Percent Blockage

20%

25%

Rough Surface

Smooth Surface

Lower Drag and Extended Turndown

Golf balls fly farther because they have a dimpled surface that

lowers aerodynamic drag.

-The grooves and roughness on the Verabar's frontal surface

apply the same principle. This simple design feature relieves the partial vacuum at the rear of the sensor, reducing the pressure drag. This extends the accuracy and rangeability to very low velocities.