Bacharach Fyrite Classic Manual De Propietario

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.

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

 Refi ll Bottles due to extended storage, 

and can be fi ltered through cheese cloth or other screen like material when refi lling 

FYRITE.

NOTE: If compressed gas standards are used to check FYRITE