Summary and Implications
Performance of Single Point Monitors (SPMs) was evaluated for measuring aerial ammonia (NH3 ) and hydrogen sulfide (H2 S) under laboratory and field conditions. Calibration gas or NH3 /H2 S-ladden air at various dew-point temperatures (tdp ) were introduced simultaneously to the SPMs under evaluation and a chemiluminescence NH3 analyzer or a pulsedfluorescence H2 S analyzer. Linear relationships were found between readings of the SPMs and those of the respective gas analyzer. Moisture in the air positively influenced the SPM readings. The SPM readings for H2 S measurement can be corrected to achieve 90% to 107% agreement with the analyzer readings. However, such corrections proved not as effective for NH3 measurements (59% to 90% agreement). To improve quality of H2 S data obtained with SPMs, moisture content of the sample air should be concurrently measured and its effect on output readings compensated.
Iowa State University
Liang, Yi and Xin, Hongwei
"Performance of Single Point Monitor in Measuring Ammonia and Hydrogen Sulfide Gases,"
Animal Industry Report:
AS 651, ASL R2012.
Available at: http://lib.dr.iastate.edu/ans_air/vol651/iss1/47