Model 3110 - Teledyne Analytical Instruments

Portable Trace Oxygen AnalyzerMaintenanceEffect of CO 2 on B-2 Cell Life1. This curve assumes continuous exposure.2. Intermittent exposure will extend life. Ingeneral, the CO 2effect is cumulative andthe average CO 2concentration should beused to find the predicted cell life.3. Cells can be used to make spot checkmeasurements of O 2in the presence ofhigh concentrations of CO 2(up to 50%and more). Any sample containing CO 2should be purged as soon as a constantreading is obtained.4. Abnormally slow response and recoveryis characteristic of cells used as indicatedin notes 1, 2, and 3 above.5. The reduction in cell life is primarily dueto a drop in output. Cell life will reduceto a point where the instrument can nolonger be spanned. Instruments using B-2cells in CO 2atmospheres should bespanned at intervals of 10-20% of thepredicted cell life.6. The CO 2effect on B-2 cells isindependent of the O 2level. Usage inCO 2contributes significantly to cell lifereduction and thus affects cell warranty.Figure 4-2: Effects of CO2 on B-2 Cell LifeTeledyne Analytical Instruments 45