Analytical · Free Calculator
Calibration Gas Dilution Calculator
Mix a span gas cylinder with zero gas (nitrogen or zero air) to make a lower calibration concentration, or find the flows needed to reach a target value.
Span gasZero gasDilution ratioTarget concentration
ppm
L/min
L/min
Mixed concentration100 ppm
Dilution ratio1 : 10
Total flow2 L/min
How this result was calculated
- C = Cspan × Qspan ÷ (Qspan + Qzero) = 100 ppm
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Dilution Formula
Cmix = Cspan × Qspan ÷ (Qspan + Qzero)
Worked example
1000 ppm span gas at 0.2 L/min mixed with 1.8 L/min of nitrogen gives 100 ppm (1 : 10 dilution).
Key insight: the accuracy of the mix is only as good as the flow measurement; mass flow controllers or a certified gas divider are needed for audit grade calibrations.
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Frequently Asked Questions
How do I dilute a calibration gas?
Mix it with zero gas; the concentration falls in proportion to the span gas share of the total flow.
What zero gas should I use?
Nitrogen or zero air that is certified free of the measured component, matching the analyser background.
Why use a gas divider?
It produces accurate dilutions from one cylinder, saving multiple calibration cylinders.
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