Series 830/840/860 Instruction Manual

Appendix A

 

 

Appendix A Conversion Formulas and Gas Tables

Conversion of Flow Rate to Other T and P Conditions

The flow rate of your transducer is referenced to certain “standard” conditions of temperature and pressure. Unless otherwise specified in your order, these standard conditions are 21°C (70°F) and 760 mm of mercury (1 atmosphere). If you wish to convert to other “stan- dard” conditions or to find the “actual” conditions in the pipe where your instrument is installed, use the following relationship:

P1 T2

Q2 =

Q1

(1)

P2 T1

( )1 = The standard conditions under which your instrument was calibrated,

( ) 2 = The new standard conditions or the actual temperature and pressure conditions in the pipe,

Q1 = The gas mass flow rate referenced to the calibrated standard conditions (sccm or slm),

Q2 = The gas mass flow rate referenced to the new standard or actual conditions (sccm or slm—“S” means “standard,” accm or alm—“A” means “actual”),

P = Absolute pressure (kg/cm2 or psia), and

T = Absolute temperature (°K or °R) (°K = °C + 273, °R = °F + 460).

Example 1: Changing “Standard” Conditions

If your transducer has a flow rate reading of 10.00 slm and was cali- brated at standard conditions of 70°F (21°C) and 1 atmosphere (14.7 psia), and if you wish to convert this reading to standard conditions of 32°F (0°C) and 1 atmosphere, then you would use Equation (1) as fol- lows:

14.7460 + 32

Q2 =

(10.0) = 9.28 slm

14.7460 + 70

The flow rate referenced to 0°C will be approximately 7% lower than when referenced to standard conditions of 21°C.

Example 2: Finding the “Actual” Flow Rate

If the flow rate and calibrated standard conditions are as given in Example 1 and you wish to find the actual flow rate at 100°F and

30 psig, then you would use Equation (1) as follows:

IM-83/84/86-H

A-1

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Sierra 840, 860, 830 Conversion of Flow Rate to Other T and P Conditions, Example 1 Changing Standard Conditions

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