© TT Electronics plc

Issue B 7/2017

Page 2

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.

Platon Averaging Pitot

Tube: Flo-Bar

DS1710

CUSTOM CALIBRATION

The relationship between fluid flow and differential pressure for the Flo-Bar has

been calculated using the well-established Bernoulli theory, and confirmed by

independent flow test laboratory calibrations.

For each specific application, data on the flowing fluid and process conditions are

used to produce a flow calibration curve. Within the software, separate calculations

check for resonance effects and strength limitations in high velocity flows and

recommend the use of a larger diameter Flo-Bar or an end support when this is

necessary. Each quotation is accompanied by its own calculation sheet and

calibration graph, to provide reassurance that the correct site data has been used,

and to show the relevant DP values.

The Flo-Bar calculation sheet can be used to select a suitable DP measurement

system for the application. Available from Roxspur are electronic transmitters and

alarms, standard DP cells and mechanical gauges.

The calibration graph shown illustrates the differential pressure generated by water

flow velocity for a 25mm diameter Flo-Bar in a 250mm pipe.

Site data required to produce a Flo-Bar calculation sheet includes fluid type,

temperature and pressure, normal flow rate or required flow range, pipework

internal dimensions and pipe wall thickness.