Accurate, Cost-Effective Chemical Analysis and Monitoring

Advanced Chemical Sensors, Inc.
Technical Information Sheet

Hydrogen Sulfide Vapor Monitor
Catalog No. HS-10


ACS Vapor Monitor can be worn as a badge near the breathing zone to measure personal exposure, or placed in a room to measure area concentration.

Occupational safety standards are based on personal exposure monitoring of each employee who may be exposed to the vapor as a regular part of their job. Periodic monitoring of personnel and room concentrations is recommended

Exposure Limits: ACGIH OSHA NIOSH
TWA (ppm) 1    
STEL/CEIL (ppm) 5 C 20,50
*10-min. peak once per 8 hr shift
C 10

Sampling Medium: Fiber glass coated with Zinc Acetate
Method of Analysis: Measurement of absorbance of methylene blue dye
Reference Method: Proprietary Methylene Blue method. For comparison, see NIOSH Method S4 in NIOSH Manual of Analytical Methods. 2nd ed., Vol. 2 (DHEW/NIOSH Pub. No. 77-157-B). Cincinnati, OH: National Institute for Occupational Safety and Health, 1977. pp. S4-1-S4-100.
Recommended Sampling Time: 15 minutes to 8 hours
Minimum Level of Quantitation: 0.03 ppm for 8 hours
1.1 ppm for 15 minutes.
Interferences: There are no known interfering factors. In theory, ozone could consume the zine acetate by oxidation.
Effect of Temperature: Less then 10% for each 10 deg C variation from 24 deg C
Effect of Humidity: No effects detected at 30% RH to 92% RH.
Overall System Accuracy: Better than +/- 15% at 2 ppm for 8 hours
Storage Conditions: Maximum shelf life one year.
Recommended Holding Time: Two weeks prior to analysis.
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