Veris Accelabar Brochure

2

No Straight Run Required

The Accelabar can be used in extremely limited straight
run piping configurations. The straight run is integral to
the meter. The stabilization and linearization of the velocity

profile within the throat of
the nozzle eliminates the
need for any upstream run.

Engineering
Specifications

• Low velocity flow rates

• High accuracy:
to ± 0.50%

• Repeatability: ±0.050%

• Verified flow coefficients

• No calibration required

• Extended turndown

• No straight run
requirements

• Low permanent
pressure loss

• Mass or volumetric flow

Actual Application (see data on page 4)

Application: 3” Sch 40 Natural Gas
Operating Pressure/

Temperature: 50 PSIG/70° F
Max/Min Flow Rate: 60,000 SCFH/1,000 SCFH
Flow Turndown: 60:1
Straight Run: 0”

How the Accelabar Works

The Accelabar consists of a unique toroidal nozzle design
and a Verabar® averaging pitot. The nozzle has a patented
straight run “settling distance” that accelerates, linearizes
and stabilizes the velocity profile sensed by the Verabar.
The Verabar located within the nozzle accurately measures
and significantly increases the differential pressure output
to increase the operating range (turndown). The Accelabar
has a constant flow coefficient and produces an accuracy
of up to ±0.50%.

Other manufacturers claim high accuracy, but over
a limited turndown.

The Unique Accelabar Flow Meter

The Accelabar is a new and unique flow meter that combines two differential pressure
technologies to produce operating ranges never before attainable in a single flow meter.
It is capable of generating high differential pressures for
measuring gas, liquids and steam at turndowns previously
unattainable—with no straight run requirements.

Stabilizing &

linearization section

Toroidal

inlet

Accelabar

nozzle

RTD
(optional)

Verabar

Diffuser
cone

FLOW

US Patent No. 6,868,741B2 and various foreign patents pending.

3

Verabar Provides the Accuracy

The proven technology of the Verabar makes
the Accelabar work. It accurately measures the
flow rate within the nozzle. Its unique bullet shape,
constant flow coefficient, solid one-piece construction,
non-clog design and signal stability make it the
only design capable of producing the overall
performance.

Verified Accuracy and
Flow Coefficients

Empirical test data from independent
laboratories verified an analytical model
and flow coefficients as constant and
independent of Reynolds Number
and within ±0.75% of the predicted
value over a flow turndown of 65:1
(see actual test). This eliminates

the need for calibration.

0.500

0.490

0.480

0.470

0.460

0.450

0.440

0.430

0.420

0.410

0.400

Published Flow Coefficient: 0.4568
Reynolds Number Range: 6,517 to 438,160
Flow Turndown: 65 to 1
DP Turndown: 2,293 to 1 (0.111” H2O to 255.51” H2O)

Flow Coefficient (K)

Flow Test

Accelabar Flow Meter

Flow Coefficient vs. Reynolds Number

Date 8-21-02

Accuracy ± 0.75%

Flow Turndown 65:1

0 50 100 150 200 250 300 350 400 450

Reynolds Number ✕ 1,000