Platypus Dosimeters

The Platypus DosimeterTM is a passive (diffusive) sampling badge for monitoring hydrogen sulfide (H2S) in the air. This badge can be used for personal monitoring or for area monitoring of H2S. The Platypus DosimeterTM can be analyzed immediately using the Dosimeter Reader to obtain high accuracy data for H2S concentration in air. No need to file forms or to wait for results from the laboratory. The Dosimeter Reader connects to any personal computer, allowing you to save and analyze data at your convenience.

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  • Clip: Remove the Platypus DosimeterTM badge from its protective pouch. For personal exposure monitoring, attach the Platypus DosimeterTM badge to the lapel. For area monitoring, attach the badge to an object within the relevant zone. Record the time at which sampling begins.
  • Analyze: Remove the Platypus DosimeterTM badge from lapel, or other object, and record time at which sampling ends.  Remove the protective plastic cover from the badge.  Insert the badge into the Dosimeter Reader, and save the H2S exposure data to your personal computer.


For personal exposure monitoring, the badge can be used to monitor time-weighted average (TWA) exposure, or at short-term exposure limits (STEL).

For area monitoring, multiple badges can be used to monitor H2S around a zone. A single badge can be used continuously for multiple days.


The Platypus DosimeterTM badge and Dosimeter Reader have been extensively, and rigorously tested in the laboratory and in the field.  The badge can detect concentrations as low as 0.2 ppm of H2S with high accuracy, and under almost any temperature, humidity or multi-gas environment.



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Technical Data SheetUser Manual (Dosimeter Reader);




A microscopic inlet at the bottom of the Platypus DosimeterTM badge permits controlled diffusion of gases. An absorbent material inside the badge traps every molecule of H2S present in air. The absorbed H2S catalyzes a chemical reaction, and the track of this chemical reaction is directly related to the concentration of H2S and the time of exposure. The length of the H2S reaction track is labeled L(c0, t), where c0 represents the concentration of H2S in air and t represents the exposure time.



The Dosimeter Reader translates the reaction track in an exposed dosimeter badge into a precise concentration of H2S in air.


U.S. Pat. No. 628419, No. 6858423, No. 7135143, No. 8246911, and other pending patent applications.  View Platypus Terms and Conditions