Hydrogen Sulfide Gas Detectors (H2S Detector)

H2S SensorThe use or production of hydrogen sulfide (H2S) is widely spread across industries and applications including iron smelters, landfills, food processing plants, and breweries. Nuclear power plants use hydrogen sulfide to produce heavy water, an alternative to regular water that enables nuclear reactors to use ordinary uranium fuel instead of enriched uranium, and farmers use H2S as an agricultural disinfectant. Hydrogen sulfide is highly flammable, explosive, and extremely toxic. To accurately monitor the many areas where this gas can pose a hazard, Industrial Scientific offers a variety of H2S gas detectors, including the Ventis® Pro Series, the Ventis® MX4, and the MX6 iBrid® personal multi-gas detectors, the Tango™ TX1, and GasBadge® Pro single-gas monitors, the Radius® BZ1 Area Monitor, and the T40 Rattler®, a low-cost, maintenance-free single gas detector for use in the most extreme conditions.

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Hydrogen Sulfide - H2S



Will explode; LEL 4.0%



Extremely toxic
Oxidizing agent


Hydrosulfuric acid, sewer gas, sour gas, rotten egg smell

Exposure limits:


PEL\TWA: 20 ppm



STEL: 5 ppm / 15 min.



IDLH: 100 ppm / 30 min


Oil and Gas industries (complete from drilling to refining), pulp and paper, and wastewater treatment

Hydrogen sulfide is a colorless gas that is known by its characteristic rotten egg-like odor. It appears naturally as a byproduct of decomposition. One of the drawbacks to trusting the senses (olfactory) for protection against hydrogen sulfide is that prolonged exposure to the gas renders the sense of smell inoperative.

Hydrogen sulfide is a highly toxic gas. It reacts with the enzymes in the bloodstream which inhibit cell respiration. In other words, high concentrations of hydrogen sulfide can shut off the lungs. Low concentration exposure to the gas can burn the respiratory tract and cause swelling around the eyes.

Effects of Various H2S Levels

Hydrogen Sulfide Level in PPM

Resulting Conditions on Humans


Minimal perceptible odor.


Easily detected, moderate odor.


Beginning eye irritation.


Strong, unpleasant odor, but not intolerable.


Coughing, eye irritation, loss of sense of smell after 2 to 5 minutes.


Marked conjunctivitis (eye inflammation) and respiratory tract irritation after
one hour of exposure.


Loss of consciousness, cessation (stopping or pausing) of respiration, and death.


Unconsciousness at once, with early cessation of respiration and death in a few minutes.
Death may occur even if the individual is removed to fresh air at once.

Source: American National Standards Institute (ANSI Standard No. Z37.2-1972)


Take the guesswork out of gas detectionWhen it comes to lifesaving gas detectors, you can’t afford to guess. Gas detectors today offer features that provide clear information on the instrument status and sensors, tell the user how to react when an alarm goes off, and make it easy to interpret the readings. This white paper covers technology that makes gas detection easy for all users.

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