Specifications

Instruction 0011-9026 Page 1

INSTRUCTIONS 0011-9026

OPERATION/MAINTENANCE

BACHARACH FYRITE MODELS

and O

INDICATORS

1.0 DESCRIPTION (Refer to Figure 1)

The FYRITE employs the well-known “Orsat” method of volumetric analysis involving

chemical absorption of a sample gas, such as carbon dioxide or oxygen. The reagent

used to absorb carbon dioxide (CO

) is potassium hydroxide (dyed red), and chromous

chloride (blue) is the absorbent for oxygen (O

). The unique feature of the FYRITE is

that the absorbing ﬂ uid is also used as the indicating ﬂ uid so that one vessel takes the

place of both measuring burette and absorption pipette.

The body of the FYRITE is molded of clear high-strength plastic, comprises top and

bottom reservoirs and a center tube connecting the two reservoirs. The bottom of the

lower reservoir is sealed off by a synthetic rubber diaphragm that rests on a perfo-

rated metal plate. The upper reservoir is covered by a molded plastic cap that contains

a double -seated plunger valve. A spring holds this valve against a carefully ﬁ nished

seat in the top cap providing a perfect seal which makes the instrument spill-proof in

any position. When the valve is partially depressed, the entire instrument is open to

the atmosphere and the instrument is, of course, is no longer spill-proof.

The bottom reservoir is ﬁ lled with the absorbing ﬂ uid, which extends about 1/4 inch

into the bore of the center tube when the instrument is held upright. The scale posi-

tion, mounted to one side of the center tube, is adjustable.

2.0 FYRITE INSPECTION BEFORE AND DURING TEST

CAUTION

Corrosive ﬂ uid is contained inside unit, instructions should be

thoroughly read before operation is attempted.

2.1 Pre-Operational Check

To ensure proper FYRITE operation and reliable results, check the following:

(a) With FYRITE vented and in a vertical position, it should be possible to adjust

scale zero to the top of the ﬂ uid column. Refer to FYRITE Operation for proper

setup (Section 3.0 Steps 1 through 5). If this is not possible, add or remove a small

amount of ﬂ uid per Section 6.1.