Bacharach Fyrite Classic Manual De Propietario
Instruction 0011-9026
Page 18
The gas concentration read on the FYRITE is directly dependent upon the mass of air
in the sample. The aspirator bulb used in the FYRITE is a constant-volume pump,
not a constant-mass pump. Altitude, therefore, affects the FYRITE reading due to the
air’s density changing with altitude, thus requiring higher CO
2
or O
2
concentrations to
reach the same mark on the scale.
Use the following table to fi nd the altitude correction (e.g., add the correction to the
reading to get the correct concentration).
TABLE 5-1. ALTITUDE CORRECTION TABLE
Altitude Correction %
Ft. (Meters)
20% CO
2
21%
O
2
7%
O
2
or CO
2
1000
(305) 0.0
0.0
0.0
2000
(610) 0.0
0.0
0.0
3000
(914) 0.1
0.1
0.0
4000
(1575) 0.1
0.2
0.1
5000
(1219) 0.2
0.2
0.2
6000
(1829) 0.2
0.3
0.2
7000
(2134) 0.3
0.3
0.3
8000
(2438) 0.4
0.4
0.3
9000
(2743) 0.4
0.5
0.4
10,000
(3048) 0.5
0.6
0.5
11,000
(3353) 0.6
0.7
0.5
12,000
(3658) 0.7
0.8
0.6
13,000
(3962) 0.7
0.8
0.6
14,000
(4267) 0.8
0.9
0.7
6.0 FYRITE MAINTENANCE
NOTE: With FYRITE vented and in a vertical position, it
should be possible to adjust scale zero to the top of the fl uid col-
umn. Refer to FYRITE Operation (Section 3.0) Steps 1 through
4 (for CO2) or Steps 1 through 5 (for O2) for proper setup. If
this is not possible, add or remove a small amount of fl uid as
described below.
6.1 Increasing FYRITE Fluid To Proper Level
Refer to Figure 18. Hold FYRITE upright and cover hole in center of Plunger Valve
with fi nger. Add clean water, a few drops at a time (dripping water faucet is con-
venient) into space around Plunger Valve. Work Plunger Valve up and down several
times. Repeat process until fl uid is at proper level.
6.1.1 Decreasing FYRITE Fluid to Proper Level