Model L2140-i - High-precision triple oxygen isotope analyzers
From Isotopic Analyzers
Figure 1 shows an Allan variance plot of water vapor measurements collected at 23,000 ppm. Averaged over one hour, the L2140-i delivers a precision of better than 15 per meg in 17O-excess. For liquid waters introduced to the L2140-i by the Picarro High-Precision Vaporizer (A0211), precision is also better than 15 per meg. Frequent calibration by waters with known isotopic compositions, should improve precision to better than 10 per meg.