Platon Averaging Pitot

Tube: Flo-Bar

DS1710

© TT Electronics plc

Issue B

7/2017

Page 1

TT Electronics | Roxspur Measurement & Control Ltd

2 Downgate Drive, Sheffield, S4 8BT, England |Ph: +44(0)114 244 2521

www.roxspur.com | sales@roxspur.com

General Note

TT Electronics reserves the right to make changes in product specification without

notice or liability. All information is subject to TT Electronics’ own data and is

considered accurate at time of going to print.

Description

The Flo-Bar is an Averaging Pitot Tube flow sensor for use on pipes, ducts

or chimneys. Differential pressure created across the Flo-Bar has the

standard square root relationship to flow rate, making a simple,

removable sensor for installation or retrofit on flowlines of any size.

The unique design of the Flo-Bar profile provides a high accuracy, wide

rangeability sensor: the standard integral manifold allows simple process

isolation and easy installation of a DP measurement cell.



Flow sensor for liquids, gases or steam



±1% Accuracy with standard square root flow output



Full electron beam welded construction



Unique profile sensor with flow averaging



Integral 3 valve manifold



Simple direct mounting of DP transmitter if required



Plain head and remote manifolds available

OPERATING PRINCIPLE

The Flo-Bar brings modern production techniques and design to the

classic Pitot Tube flow measurement technique. The Flo-Bar is

mounted across the pipe diameter, with a number of impact pressure

sensing ports on the upstream face. Liquid and gas flows produce an

Impact pressure, in accordance with well-established formulae. The

Flo-Bar averages this pressure across the pipe diameter, to take

account of any flow profile irregularities. Downstream there is a

single pressure sensing port; the precision engineered profile of the Flo-Bar at this reference pressure position ensures a

stable separation for flow vortices, giving a stable flow calibration factor over a wide flow turndown.

The differential pressure developed across the Flo-Bar is proportional to the square of the flow velocity, and can be

measured using either a DP cell, a simple mechanical pressure gauge, or even displayed on a liquid U-tube manometer –

depending on the application requirement. The Flo-Bar is available with a number of standard options. Particularly useful

is the integral three valve manifold.