RKI Instruments EAGLE 2 Manual - Manual (Page 31)

EAGLE 2 Operator’s Manual Optional Accessories • 21
External Dilution Fittings
Two external dilution fittings are available for the EAGLE 2, a 1:1 dilution
fitting and a 3:1 dilution fitting. They are designed to mate with the inlet
fitting and accept a sample hose or probe. The fittings are made with brass
and nickel plated brass and are appropriate for use with the four standard
gases. The 1:1 fitting is normally used when it is necessary to introduce air
into a sample that has no oxygen or a very low level of oxygen, such as a
nitrogen purged sample. Both the 1:1 and 3:1 fittings can also be used when
one of the target gas levels in the sample area will likely be present in a
concentration above the detection range for that gas. Since the fittings
partially consist of unplated brass, they are not appropriate for detection of
elevated levels of H
2
S or of gases that are easily absorbed such as Cl
2
or SO
2
.
Figure 14: 1:1 and 3:1 Dilution Fittings
1:1 Dilution Fitting 3:1 Dilution Fitting