Bacharach FYRITE Gas Analyzer CO2 and O2 Indicators, Operating & Maintenance Manual

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Instruction 0011-9026 Page 21
accuracy don’t forget to saturate fi lter saturator wool packing
as such gas standards are usually supplied “bone dry”.
6.2.2 O
2
FYRITE Fluid Only
Fresh FYRITE fl uid will absorb all O
2
from approximately 100 samples containing
10% O
2
. After completing test (as outlined in Section 3.0 Steps 1 through 9) O
2
FY-
RITE Fluid strength can be checked by performing steps outlined below:
1. DO NOT VENT FYRITE, but reabsorb sample gas into FYRITE by inverting until
fl uid drains into top reservoir, then turn upright to drain fl uid into bottom reser-
voir. Repeat this step three (3) more times (four complete inversions total).
2. Hold FYRITE at 45° angle momentarily to allow fl uid droplets to drain into bot-
tom reservoir.
3. With FYRITE held upright, permit fl uid in column to stabilize a few seconds, then
immediately read % oxygen on scale at the point corresponding to top of fl uid col-
umn. If reading increases by more than 1/2 percent O
2
as compared to the initial
reading, replace fl uid.
When it is desirable to check fl uid strength before taking the FYRITE to a location
where it will be used, it can be conveniently tested on a sample of atmospheric air
which contains 20.9% O
2
.
NOTE: Make certain wool in fi lter saturator tube is moistened
with water when using FYRITE in a non -combustible applica-
tion where the gas sample is not fully saturated with water
vapor.
Formation of a frothy, persistent foam on FYRITE fl uid also indi cates need for fl uid
replacement. A few “beads” or small air bubbles fl oating near the small center bore
wall is not considered foaming. Color of FYRITE O
2
(blue) fl uid is not an index of
ability to absorb oxygen although towards the end of fl uid life, a greenish cast can be
detected.
NOTE: If compressed gas standards are used to check FYRITE
accuracy, don’t forget to saturate fi lter saturator wool packing
as such gas standards are usually supplied “bone dry”.
6.3 Replacing FYRITE Fluid (Refer to Figs 20, 21, and 22)
CAUTION
Because of the corrosive effect of the FYRITE fl uid, always
change FYRITE fl uid in immediate vicinity of a sink with run-
ning water available as shown in Figure 18.
Remove 4 screws, metal Top Cap Ring, plastic Top Cap Assembly and Top Gasket.