A Carbon Monoxide Recorder and Alarm Page: 28
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A CARBON MONOXIDE RECORDER AND ALARM
CO,; but the decrease was small, the potentials decreasing only
0.60 per cent for each per cent of CO2 present.
Calculations based on thermochemical data given on page 19
indicate that the decrease in potential due only to the greater heat
capacity of CO2 per unit volume is 0.48 per cent for 1 per cent of
CO2. The 0.12 per cent difference may be due to mass action of the
CO2 in opposing the oxidation of CO or to CO adsorbed on the hop-
calite preventing some of the catalytic action. Lamb and Vail 24
find a similar but much greater effect of adsorbed CO2 upon the
action of hopcalite at 250 C. The very small effects of the CO, at
100 C. may be ignored in most practical applications of the CO
recorder. If elimination of the effects of the CO2 should be desirable
for some special purpose, a more effective CO2 absorbent may be
included in the gas-purifying train.
PERFORMANCE OF CO RECORDERS DURING EXTENDED USE
CO RECORDS FROM EXHAUST GASES OF A GASOLINE ENGINE
A CO recorder was operated through a period of six months in
connection with physiological tests of gasoline-engine exhaust gases.
Fresh air diluted the exhausts until the CO concentrations approx-
imated 1 to 4 parts in 10,000. Then the gases were passed through
a chamber where the CO was recorded during all test periods lasting
about seven hours per working day.
Plate II shovs this recorder. All tubes were of glass, connected
with rubber nipples, and the parts were assembled on a wooden
frame designed to set on a table or bench. The thermocouples were a
series of six pairs set lengthwise along a diametrical plane in a glass
tube holding pumice and hopcalite. Except for the thermocouple
construction in the cell, the glass parts and connections were similar
to those of the thermometer-and-hopcalite indicator for carbon
monoxide.
The air in the chamber was sometimes sampled, simultaneously
with the operation of the recorder, continuously and at a uniform
rate to obtain composite samples. Two such samples were taken
each day, one in the morning and one in the afternoon. They were
analyzed by the blood-pyrotannic acid method, accurate to about
one-half part per 10,000.25 The average concentration of CO was
determined from the recorder graph by integrating the time-con-
centration area and dividing by the time. A statement of the accu-
34 Lamb, A. B., and Vail, W. E., "The effect of water and of carbon dioxide on the catalytic oxidation
of carbon monoxide and hydrogen by oxygen," Jour. Am. Chem. Soc., vol. 47, January, 1925, pp. 123-142
25 Sayers, R. R., Yant, W. P., and Jones, G. W., The Pyrotannic Acid Method for the Quantitative
Determination of Carbon Monoxide in Blood and Air, Report of Investigations, Serial 2486, Bureau of
Mines, June, 1923, 6 pp. Also Tech. Paper 373, Bureau of Mines, 1925, 17 pp.28
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Katz, Sidney H.; Reynolds, D. A.; Frevert, H. W. & Bloomfield, J. J. A Carbon Monoxide Recorder and Alarm, report, 1926; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc66402/m1/34/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.