Veris – Verabar

Verabar®

Verabar provides the most accurate, reliable technology for measuring gas, liquid and steam as well as the lowest operating and installation costs.

How it Works

The Verabar senses the natural averaged pressures created by the velocity of the fluid. When the fluid impacts the sensor, it creates a high-pressure zone (greater than the pipe static pressure) in front of the sensor. As the fluid moves past the sensor, it accelerates and a low-pressure zone is created to the sides and rear of the sensor. Alternate vortices are shed as the fluid separates from the sensor and a partial vacuum is formed at the rear of the sensor. Multiple ports are positioned in the high and low-pressure zones and an averaged differential pressure is produced. Verabar’s superior performance is due to its shape, surface condition and low-pressure port location.

• No clogging
• Stable signal
• Low drag and increased structural strength
• Solid one-piece construction

The Verabar Difference

Superior Sensor Design

Developed from aerospace technology, the Verabar averaging pitot flow sensor provides unsurpassed accuracy and reliability. With its solid one-piece construction and bullet shape, the Verabar makes flow measurement clog-free and precise. The unique sensor shape reduces drag and flow-induced vibration. And the location of the low-pressure ports eliminates the potential for clogging and improves signal stability.

Greater Resistance to Clogging

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 and produces an extremely stable signal.

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.

Verified Accuracy

Verified Theoretical Model

The unique and exclusive break-through in improved accuracy is derived from the development of a verified theoretical model to predict the Verabar flow coefficients.

This eliminates the need for calibration tests to characterize the coefficients. Without such a model, the uncertainty of the flow coefficients is dramatically increased and expensive calibration may be required. Empirical test data from independent laboratories verified the theoretical 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 (VED-100).

Proof of Veribar Accuracy

The true test of a flow measurement device is its ability to repeat its published flow coefficient within its accuracy band. Verabar has been thoroughly tested at independent flow laboratories (all sensor sizes, in multiple pipe sizes, in gas and liquids).

Mounting Methods

Spring Lock

This advanced, patented design ensures the sensor remains sealed, locked and pre-loaded to the opposite wall regardless of changes in pipe diameter due to pressure, temperature or mechanical force. This design has important advantages:

• Fugitive emission and leak prevention…The Spring-Lock continually compensates for the differential in packing and body growth rates due to increased temperature
• Increases sensor strength, thereby eliminating the need for an opposite wall support. A locked, pre-loaded sensor is four times stronger than a non-pre-loaded, cantilevered sensor
• Other mounting methods do not pre-load the sensor or the packing seal and are subject to increased sensor vibration, metal fatigue, breakage

Direct Mount Manifold Heads

Our integral manifold head permits the direct flanged connections of the transmitter to the instrument head, thus eliminating the need for any connecting hardware. The integral manifold head design is ideal for gas applications. This allows the transmitter to be placed in close proximity to the pipe, reducing compressor pulsation effects.

Complete Flow Loops

Ready to install, the Verabar can be ordered with a manifold, transmitter or local indicating meter, flow computer and/or recorder. Complete Installation in less than an hour.

Models

Regular Models

Verabar V100 & V110

This is our most economical sensor and is mounted through a simple tube fitting. The V110 includes support on the opposite wall of the pipe.

Verabar V150

This advanced, patented design ensures the sensor remains sealed, locked and preloaded to the opposite wall regardless of changes in pipe diameter due to pressure, temperature or mechanical force.

• Most cost effective
• Quick installation
• Threaded components

Hot Tap – Threaded Models

Verabar V200

This sensor can be inserted and removed under pressure. It has threaded components and is available in single rod and double rod units.

Verabar V250

This threaded, hand insertion and retraction model (no threaded rods) is for low-pressure applications and can be installed without system shutdown.

Hot Tap – Flanged Models

Verabar V400

This sensor can be inserted and removed under pressure. It has flanged components and is available in single rod and double rod units.

Extended Range V400D

This sensor is similar to the V400 sensor but is designed for larger pipe sizes and higher velocities. Spec Sheet Verabar V450 This flanged, hand insertion and retraction model (no threaded rods) is for low-pressure applications and can be installed without system shutdown.

• Install without system shutdown
• Threaded or flanged components

Flanged Models

Verabar V500/V510

This model is used when flanged components are required. Available in flanged ratings up to 2500# ANSI. The V510 model includes opposite side support. Spec Sheet V500/V510 Installation Instructions Extended Range V500/V510 These sensors are similar to the V500/V510 sensors but are designed for larger pipe sizes and higher velocities.

Verabar V550

This flanged model ensures that the sensor remains sealed, locked and pre-loaded to the opposite wall, regardless of changes in pipe diameter due to pressure, temperature or mechanical force. Single or double support Flanged components Up to 2500# ANSI.