Scanner 2000 Flow Computer Averaging Pitot Tube Calculations Brochure Cameron

User Manual: Scanner 2000 Flow Computer Averaging Pitot Tube Calculations Brochure Resource Library

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Averaging Pitot Tube
(Annubar®) Calculations
Scanner® 2000 microEFM

Averaging Pitot Tubes
The NuFlo™ Scanner® 2000 microEFM has been successfully implemented in a variety of applications around the world for use
with liquid and gas turbine meters, orifice meters, and cone meters. Now the same measurement accuracy and low-power functionality is available for use with averaging pitot tube (Annubar®) meters.
An averaging pitot tube flow run is easily configured with ModWorX® Pro software provided free of charge with all Scanner 2000
purchases. ModWorX Pro comes preloaded with the parameters for a dozen of the most commonly used meters, greatly simplifying the setup process.
An averaging pitot tube measures flow by averaging the pressure at various ports along the length of a probe. A typical meter
features two chambers with multiple ports drilled into each. The ports in one chamber face upstream and the ports in the other
face downstream. The probe’s insertion into the flow stream creates dynamic and static pressures. The upstream ports sample and
average the dynamic pressure. The downstream ports sample and average the static pressure. A readout device measures the differential pressure between the chambers.
The Scanner 2000 supports the flow
calculations defined in ASME MFC-12M.
Devices that utilize these calculations,
and are therefore supported by the Scanner 2000, include Preso’s Ellipse, Meriam’s
Accutube, the Torbar from Torbar Flowmeters Limited and Hitrol’s HAPT. Devices
that utilize other equations for determining the discharge coefficient and/or
expansion factor are not supported by
the Scanner 2000.
The Scanner 2000 mounts directly to the
block manifold that connects to the averaging pitot tube. Orientation and location
of the Scanner 2000/meter assembly with
respect to piping will vary, depending
on piping configurations and the type
of fluid being measured. For installation
instructions, follow the recommendations
of the averaging pitot tube manufacturer.

Configuring a
Flow Run
An averaging pitot tube flow run may be
configured for gas, liquid or steam measurement (without wet gas correction).
1. From the ModWorX Pro main screen,
click the Configure menu button.
2. Click Flow Run 1 on the Configuration
Menu screen. The Configure Flow Run
screen will appear.

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3. Enter a name for the flow run and
enter unit settings and calculation
parameters as applicable in the Flow
Run Settings section of the screen.
4. In the Flow Rate Calculation section,
click the Change button near the top
of the screen.

5. From the Change Flow Run Calculation Methods screen,
select the Fluid Properties Calculation Method that is appropriate for the type of fluid being measured.
IMPORTANT: When measuring steam, DO NOT select IF-97
with James correlation; wet gas correction is not supported
by averaging pitot tube calculations.
6. Click Averaging Pitot Tube (Annubar®) in the Flow Rate
Calculation Method section of the screen.
7. Click OK to save your selections and return to the Configure Flow Run screen.

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Meter Selection
Default parameters for an averaging pitot
tube meter are displayed on the Configure Flow Run screen in the Flow Rate
Calculation section.
To set up a new meter, perform the following steps:
1. Click the Change Meter link in the
Averaging Pitot Tube section of the
Configure Flow Run screen. The
software will prompt you for permission to lock all sensor inputs and enter
the Maintenance Mode. Click Yes to
proceed.
The Maintain Flow Run screen will
appear.

2. Click the Select Meter button to
display the Select Averaging Pitot
Tube dialog.

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3. Click on a meter in the left column to
select it. Parameter values corresponding to your selection will appear in the
Meter Information block on the right.
The first selection allows the user to
enter specifications for any averaging pitot tube (model number, probe
width, coefficients and reference
temperature) in the Meter Information
block. If an Annubar® meter is in use,
the user can select the meter model or
type from the selections provided.
4. Click OK. Your meter parameter selections will appear as New Averaging
Pitot Tube Parameters on the Maintain
Flow Run screen.

5. Enter the pipe size for your installation.
6. Select the appropriate probe material
from the dropdown menu.
7. Select the appropriate pipe material
from the dropdown menu.
8. Enter a serial number, if desired.
9. Click Save Changes. The new parameters will automatically move to the
right side of the screen as Current
Averaging Pitot Tube Parameters.
10. Click Yes on the confirmation dialog
to write the data to the Scanner 2000.
You may now exit the Maintenance
Mode.

5

Changing the Flowmeter or Meter Parameters
Once a flow run is configured for
use with an averaging pitot tube
meter, the user can change the
meter or edit the parameters of
an existing meter by clicking the
Maintain Flow Run menu at the
top of the main screen.
The user is prompted for permission to lock all sensor inputs and
enter the Maintenance Mode. Click
Yes to proceed.
A maintenance task dialog appears with optional maintenance
tasks to select. The content of this
dialog will vary, depending on
the fluid properties and flow rate
calculation method selected for
the flow run.
1. To select a new meter, or to
change a parameter of an
existing meter, click Change
Averaging Pitot Tube.
The Maintain Flow Run screen
will appear.
2. Select a new meter or modify
existing parameters as
required.
If updating parameters of the
current meter, you may copy the
current parameters into the New
Averaging Pitot Tube Parameters
block by clicking the Copy from
Current button at the bottom of
the screen.
3. Make any change necessary and
click Save Changes.

ModWorX is a registered trademark of Cameron International Corporation.
NuFlo is a trademark of Cameron International Corporation.
Annubar is a registered trademark of Rosemount Inc.

Part No. 9A-30165028, Rev. 01
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