Gordon England Surface Engineering Forum

Plasma Gas Flow Conversion Formula

Formula for plasma gas flow unit conversion

M1 = Molecular weight of calibrated gas
M2 = Molecular weight of gas flowing
P1 = Pressure of calibration gas in absolute units
P2 = Pressure of gas flowing in absolute units
T1 = Temperature of calibration gas in absolute units
T2 = Temperature of gas flowing in absolute units
F = Direct reading of flowmeter
Q = Standard volume gas flow rate

Molecular Weights of Gases:	Air	29
	Nitrogen	28
	Argon	40
	Helium	4
	Hydrogen	2

7MC Flowmeter Calibrated as Follows:

Primary gas flowmeters	Nitrogen @ 50 psi, 70^oF
Secondary hydrogen flowmeters	Hydrogen @ 50 psi, 70^oF
Secondary helium flowmeters	Nitrogen @ 50 psi, 70^oF

Simplify Formula
Assuming T1 = T2 = room temperature

The formula is reduced to:
formula for plasma gas flow conversion

Looking back at the formula note:

- to convert psi to absolute pressure, add 14.7
- to convert ^oC to K add 273.15
- to convert ^oF to Rankine add 460

Note that this formula is only valid if there are no obstructions between the gas source and the flowmeter (valves etc.) In the cases of the 7MC system, the formula can be used to calculate the flows through the primary and helium flowmeters only.

Plasma gas flow correction / conversion calculators

CONVERSION CALCULATORS

Convert between Different Units of Measurement

Index of Unit Converters

HEAT TRANSFER
COEFFICIENT

SPECIFIC HEAT
CAPACITY

VOLUMETRIC
HEAT CAPACITY

Unit Prefixes

Plasma
Gas Flow

Hardness
MPa - GPa

Computing
Bits and Bytes

To use the measurement conversion calculators simply enter a number value into the desired field and click calculate. All results shown will be equivalent values. Values are given to seven significant figures ( the odd result may show 9's or 0's over running). Values of 10 000 or greater will be displayed in the e-format e.g. 2.3456e7 which equals 2.3456 x 10⁷ or 23 456 000. Values lower than 0.001 will be displayed in the e-format e.g. 2.3456e-5 which equals 2.3456 x 10^-5 or 0.000 023456. The calculators require that your browser has java script enabled. View all measurement unit conversion calculators on the same page (may not work with all browsers; requires Iframe).

Si Units:

	SI Base Units
	SI Derived Units
		expressed with special names
		expressed in terms of SI base units
		expressed in terms in terms of SI units with special names
	SI Unit Prefixes
	Non-SI Units
		accepted by SI
		currently accepted by SI
		derived CGS units with special names
		other non-SI units
	Constants
	Glossary of Units

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