Bacharach FYRITE CO2, Operating & Maintenance Manual

Page: 23 / 40

Instruction 0011-9026 Page 19
Refer to Figure 19. To remove excess fl uid, insert small diameter glass tube into FY-
RITE fl uid through the small center FYRITE bore (with Top Cap Assembly removed).
Seal open end of glass tube with fi nger and dip out fl uid with glass tube until FYRITE
fl uid is at proper level. Avoid unnecessary exposure of O
2
fl uid to air since it will rap-
idly absorb O
2
and become exhausted.
6.2 Checking FYRITE Fluid Strength
6.2.1 CO
2
FYRITE Fluid Only
Fresh FYRITE fl uid will absorb all CO
2
from more than 350 samples containing 10%
CO
2
. Where it is desirable to check fl uid strength before taking FYRITE to the test
location to be used, or when a questionable (low) FYRITE reading is obtained the
instrument may be tested on any sample of CO
2
. Exhaled breath (containing approxi-
mately 4% CO
2
) is often most convenient.
Disconnect the rubber bushing and Sampling Hose Assembly from the Filter Satura-
tor Tube. Place the rubber connector tip over the Plunger Valve and depress Plunger
Valve down fi rmly with rubber connector tip. Take a deep breath, hold for 3 or 4
seconds and exhale at a steady rate into the rubber bushing end of the Sampling Hose
Assembly. Simultaneously squeeze the Aspirator Bulb several times while exhaling
breath. Release rubber connector tip from Plunger Valve while still exhaling breath.
Perform steps outlined below to absorb exhaled breath into FYRITE fl uid.
1. Absorb sample gas into FYRITE by inverting until fl uid drains into top reser-
voir, then turn upright to drain fl uid into bottom reservoir. Repeat this step once
more (two 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 % carbon dioxide on scale at point corresponding to top of fl uid
column.
To check CO
2
FYRITE fl uid strength - DO NOT VENT FYRITE but reabsorb sample
gas by inverting and turning upright. Repeat this step once more (two complete inver-
sions total). If reading increases by more than 1/2 percent CO
2
as compared to initial
reading; replace fl uid.
Formation of a frothy, persistent foam on FYRITE fl uid also indicates need for fl uid
replacement. A few “beads” or small air bubbles fl oating near the small center bore
wall is not considered foaming. FYRITE fl uid may be colored for ease in readings.
Color has no bearing on fl uid strength or ability to absorb CO
2
.
Cloudy fl uid or small fl akes of solid material in fl uid do not necessarily mean CO
2
fl uid is exhausted. Precipitate may form in CO
2
Re fi ll Bottles due to extended storage,
and can be fi ltered through cheese cloth or other screen like material when re fi lling
FYRITE.
NOTE: If compressed gas standards are used to check FYRITE