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Verabar compared To Other Insert Industrial flow sensors

Quality Assurance

This can result in a significant undetec-

table loss in accuracy.

average velocity. In actual industrial applications, sensors are located downstream

Veris manufactures its own leak-proof, solid one-piece sensor. Our primary goal is to provide the highest quality and most accurate sensor in the

disturbances, such as elbows or valves,

Verabar is designed to meet or exceed applicable ANSI and ASME codes.

which produce non-uniform velocity pro-

files. This makes it virtually impossible to locate a single point that represents the

The Verabar is available to meet B31.1, B31.3, B31.8, NACE MR-01-75, etc.

industry.

average velocity.

Additional QA capabilities include code welding, hydrostatic and other non-destructive testing.

Result: Inaccuracy ranging from ±10% to ±20%.

Verabar

Why Average the Velocity

Diamond sensor

Verabar sensor

Round sensor

Textbook profile

Profile?

Verabar averages the velocity profile through multi-sensing ports which span the entire pipe diameter. Other types of

Other manufacturers use a three-piece sensor design that has no positive mechanical method of maintaining

non-averaging insert meters are SINGLE POINT INSERT METERS (turbine, vortex, magnetic, sonic, etc.). They assume a "textbook: turbulent velocity profile, and use a single "critical" point to infer an

a industrial seal between the tubes. Therefore, temperature, pressure, vibration and

even manufacturing variations can cause leakage between the chambers.

Location of average velocity

Problems with Other Sensor Shapes

Round Sensors

Round sensors produce unpredictable

Diamond-Shaped Sensors

These sensors produce pulsating, noisy

Aerodynamic-Shaped Sensors

Extreme aerodynamic shapes that

accuracy. The original round sensors were designed for economical fluid

signals. Diamond-shaped sensors improved accuracy by use of a sharp

permit the stream lines to reattach are subject to airfoil type lift forces. This

balancing and did not meet industrial

edge to fix the fluid's separation

occurs when the angle of

Flow

demands for accuracy. Round

point. However, this greatly

attack varies due to sensor

sensors have a variable

amplified the vortex shedding forces.

misalignment, or the direction of the fluid varies, as is common in

separation point that causes an unstable low

Variable separation point-

Fixed separation

point

Result:

The sharp edges generate extreme vortices, causing sensor

pressure distribution around

industrial piping with upstream

the sensor.

disturbances.

Flow

Result:

Inaccuracy in excess of ±5%

vibration, pulsations and a noisy

signal to the point

Result:

The lift forces can cause an Flow


and as high as ±10%.	that transmitter ^x\j dampening and	' unpredictable ¹—¹НИК shift in the low ^Lift ^forces
Л	Hv signal averaging are recommended.	pressure distribution, producing \ г inaccurate measurement.

For Immediate Service Use

U.S. & Canada Call Toll Free:

1-877-VERIS00

MPlhrl (1-877-837-4700)

Factory Assisted Service & TEchnical Response

VERiS, im

ìrabar...Ti

formance

asureme

6315 Monarch Park Place • Niwot, CO 80503 USA • Phone: 303-652-8550 • Fax: 303-652-8552 E-Mail: contact@veris-inc.com • Website: www.veris-inc.com

VB-100 (5/02) Rev. B

Printed in USA