Document Detail

An incremental method to assess the linearity of gas flowmeters: application to Fleisch pneumotachographs.
MedLine Citation:
PMID:  2972559     Owner:  NLM     Status:  MEDLINE    
A new method of studying the linearity of gas flowmeters was tested on different models of Fleisch pneumotachographs. The method applies a steady flow to the test flowmeter, which is increased in a stepwise manner by adding a constant flow-increment. This is achieved using two flow sources in parallel. The method does not require any reference flow channel and may be implemented with standard laboratory equipment. Using this method, the gain of Fleisch pneumotachographs, whatever their size, decreased by about 2-3% from low flows to about 40% of their nominal full scale (FS), and then increased almost linearly with increasing flow. The error was 8-13% at 200% FS. The following equation was devised to correct the data at high flow: Vc = Vt (1-K (Vt-S] where Vc and Vt are the corrected and measured flow respectively, K a gain correction factor and S a flow threshold below which no correction is needed. Applying this correction with suitable coefficients, the maximal error was below 3% from 0-200% FS.
C Duvivier; R Peslin; C Gallina
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The European respiratory journal     Volume:  1     ISSN:  0903-1936     ISO Abbreviation:  Eur. Respir. J.     Publication Date:  1988 Jul 
Date Detail:
Created Date:  1988-12-22     Completed Date:  1988-12-22     Revised Date:  2013-05-23    
Medline Journal Info:
Nlm Unique ID:  8803460     Medline TA:  Eur Respir J     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  661-5     Citation Subset:  IM    
Unité 14 INSERM de Physiopathologie Respiratoire, Vandoeuvre-les-Nancy, France.
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MeSH Terms
Pulmonary Ventilation*
Respiratory Function Tests / instrumentation*
Rheology / standards*

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