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Catalogue Basics and equations of dp-flow-measurement

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	Pressure p in Pa
	atm	1 atm = 101,325 Pa
	mWS	1 mWS = 9806.65 Pa
	mmWS	1 mmWS = 9.80665 Pa
	mmHG	1 mmHG = 133.322 Pa
	psi (lbf/in²)	1 psi = 6,894.76 Pa

Welcome to systec Controls

The deltaflow dynamic pressure probe you have purchased is a highly precise measurement tool of superior quality. You can count on it for the very best performance even under the most adverse conditions.

Accurate evaluation of all measurements and precise calculation of flow are integral factors contributing to the high degree of precision.

This booklet contains all information you will need in order to achieve optimal measurement results with your deltaflow.

In this booklet, the pressure unit should always be interpreted as absolute pressure (index abs). If gauge pressure values are the only values which are available (index u or g), then the current or average ambient pressure at the sampling site must be added. The average ambient pressure at sea level is 101,325Pa.


	Temperature T in K
	Unit	SI Unit K
	°C	K=°C+273.15
	°F	K=((°F-32)*5/9) + 273.1 5

Table of Contents


	Differential Pressure dp in Pa
	Unit	SI Unit Pa
	hPa	1hPa = 100 Pa
	kPa	1kPa = 1,000 Pa
	mbar	1mbar = 100 Pa
	bar	1bar = 100,000 Pa
	mWS	1 mWS = 9806.65 Pa
	mmWS	1 mmWS = 9.80665 Pa
	mmHG	1 mmHG = 133.322 Pa
	psi (lbf/in²)	1 psi = 6,894.76 Pa

Welcome to systec Controls........................................2

Table of Contents.......................................................2

Basics / Units of Measurement....................................2

General Basic Calculation Information.........................3

Formula Symbol..................................................3

Resistance Coefficient.................................................3

Expansion Number e..................................................3

Conduit Interior Diameter Conduit d...........................4

Measured Differential Pressure dp..............................4

Current Operational Density ^pb................................4

Simplified Calculation Equations.................................6

Converting the Mass Flow to Other Units....................6

flowcom Flow calculator............................................7

Questions?.................................................................7

Appendix...................................................................8


	Mass Flow qm in kg/s
	Unit	SI Unit kg/s
	t/d	1 t/d = 1,000/86,400 kg/s
	t/h	1 Vh = 1,000/3,600 kg/s
	t/min	1 t/min = 1,000/60 kg/s
	t/s	1 t/s = 1,000 kg/s
	kg/h	1 kg/h = 1/3,600 kg/s
	kg/min	1 kg/min = 1/60 kg/s
	lb/d	1 lb/d = 5.249911*10e-6 kg/s
	lb/h	1 lb/h = 125.99786*10e-6 kg/s
	lb/min	1 lb/min = 7.5598*10e-3 kg/s
	lb/s	1 lb/s = 0,45359237 kg/s

Basics / Units of Measurement

All units of measurement used in this booklet are SI units. If you use a different unit system, we recommend that you convert your values to SI units before performing calculations and then afterwards convert them back to the unit system you are using.

Instructions for converting the mass flow into volume flow, standard volume flow, or speed are described later in this booklet.


	Pressure p in Pa
	Unit	SI Unit Pa
	hPa	1hPa = 100 Pa
	kPa	1kPa = 1,000 Pa
	MPa	1Mpa = 1,000,000 Pa
	mbar	1mbar = 100 Pa
	bar	1bar = 100,000 Pa
	Torr	1 Torr = 133.3224 Pa
	at	1 at = 98,066.65 Pa


	Diameter d in m
	Unit	SI Unit m
	mm	1 mm = 0.001 m
	cm	1 cm = 0.01 m
	ft	1 ft = 0.3048 m
	in	1 in = 0.0254 m

deltaflow Basic Calculation Information 07/03

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