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DIN 51898-1

Gas analysis - Absolute volumetric method for dynamic preparation of calibration gases - Part 1: Preparation from pure gases, with CD-ROM

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Organization: DIN
Publication Date: 1 May 2014
Status: active
Page Count: 41
ICS Code (Chemical analysis): 71.040.40
scope:

This document specifies an absolute volumetric method for dynamic preparation of calibration gases - consisting of two or several components - from pure gases, using commercially available gas mixing pumps with at least two piston pumps driven at defined stroke ratios.

Peripheral devices for gas feed and homogenization are also commercially available and constitute a functional unit with the gas mixing pump.

Gas mixing pumps with several piston pumps are suitable for preparing multi-component gas mixtures, where the range of component proportions is determined by the ratio of the geometric stroke volumes of the piston pumps concerned. The geometric stroke volume is equated with the gas volume forwarded by the respective piston pump. The prerequisite condition for this process is as follows: when operating the pump at admissible stroke numbers, the conveying factor shall not deviate significantly - in comparison to the specified uncertainty - from 1.

DIN 51898-1 covers the preparation of calibration gases from commercially available pure gases (post-purified where appropriate), where the effects of impurities of the parent gases on the composition of calibration gases are accounted for in the estimation of uncertainty.

Dry air is treated as a pure gas with the composition specified in DIN EN ISO 14912 and the property data given there.

The method affords single-stage dilutions up to 1:1 000 in discrete steps.

With optimum configuration and handling, the achievable relative expanded uncertainty of composition (k = 2, confidence level 95 %) amounts to 0,1 % (see 8.3 and 8.4 for calculation and Annex C for examples).

Lower concentrations can be obtained using multi-stage dilution or pre-mixtures (see DIN 51898-21)).

The range of currently available volume flow rates of calibration gas mixtures goes from 5 l/h to 500 l/h.

Document History

DIN 51898-1
May 1, 2014
Gas analysis - Absolute volumetric method for dynamic preparation of calibration gases - Part 1: Preparation from pure gases, with CD-ROM
This document specifies an absolute volumetric method for dynamic preparation of calibration gases – consisting of two or several components – from pure gases, using commercially available gas mixing...

References

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