Welcome to Gas Sensing - Questions? CALL 605-368-1404 (M-F 7AM - 6 PM CST) or E-mail us Anytime.

Hydrogen Sulfide Information

Hydrogen Sulfide

Hydrogen Sulfide is a colorless, flammable, and poisonous gas.  Hydrogen Sulfide can be formed naturally in our environment, typically in low levels, and in many industrial processes.  Hydrogen Sulfide does have a strong odor that is commonly characterized as the smell of rotten eggs.  Hydrogen Sulfide is also referred to as "sewer gas".  The chemical formula if Hydrogen Sulfide is H2S.

In nature H2S can commonly be found in well water where organics have broken down to form H2S in the water.  The primary complaint is a foul odor and taste from this water.  Higher and potentially hazardous levels of H2S can be found in sewer systems, swamps, and wastewater lagoons. 

Industrially H2S is commonly released in high levels from natural gas that contains high contents of H2S.  Biogas generators may release up to 1% H2S in the gas streams.  Any industrial process where organic material is broken down in the absence of oxygen has the potential to create high levels of H2S.  Other industrial applications that may produce H2S are petroleum refineries, coke ovens, tanneries, paper mills, and wastewater treatment

How does H2S harm you?

Even though H2S has a strong odor, olfactory fatigue can deaden the human body's ability to detect unsafe levels of H2S.  Do not depend upon your sense of smell to indicate the presence or hazardous concentrations of H2S.

H2S is a poisonous gas, therefore most safety information is based around this potential hazard.  Keep in mind, H2S is also flammable, and even explosive in the right conditions.  Even if respirators or confined entry equipment is in use, take precautions for the potential of fire and explosion when working in environments that may contain H2S.

H2S is found naturally in the human body at low levels.  Therefore at very low levels there is no danger to H2S.  High levels of H2S can be deadly.  It is believed that 300 - 350 ppm of H2S can be deadly in a very short period of time.  In fact the British Army used H2S as a war gas during World War I in two separate occasions. 

Health Effects of H2S

Health effects vary with how long, and at what level, you are exposed. Asthmatics may be at greater risk.

  • Low concentrations – irritation of eyes, nose, throat, or respiratory system; effects can be delayed.
  • Moderate concentrations – more severe eye and respiratory effects, headache, dizziness, nausea, coughing, vomiting and difficulty breathing.
  • High concentrations – shock, convulsions, unable to breathe, coma, death; effects can be extremely rapid (within a few breaths).

 

Tips on measuring H2S

H2S is heavier than air and can sink.  Keep in mind that higher levels of H2S may be found in low lying areas

 

OSHA Regulations

   
 
OSHA General Industry PEL: 20 ppm (Ceiling); 50 ppm (Peak)
OSHA Construction PEL: 10 ppm (15 mg/m3) (TWA)
OSHA Maritime PEL: 10 ppm (15 mg/m3) (TWA)

  

OSHA Fact Sheet

 

  Additional thresholds:

  • 0.00047ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of the compound.
  • 0.0047 ppm is the recognition threshold, the concentration at which 50% of humans can detect the characteristic odor of hydrogen sulfide normally described as resembling "a rotten egg".
  • OSHA has established a permissible exposure limit (PEL) of 10 ppm.
  • 10–20 ppm is the borderline concentration for eye irritation.
  • 20 ppm is the acceptable ceiling concentration established by OSHA.
  • 50 ppm is the acceptable maximum peak above the ceiling concentration for an 8 hour shift, with a maximum duration of 10 minutes.
  • 50–100 ppm leads to eye damage.
  • At 100–150 ppm the olfactory nerve is paralyzed after a few inhalations, and the sense of smell disappears, often together with awareness of danger.
  • 300 ppm and greater leads to pulmanry edemawith the possibility of death.
  • 500 – 1000 ppm: Breathing rates speed up followed by temporary suspension of breathing at higher concentrations.
  • 800 ppm is the lethal concentration for 50% of humans for 5 minutes exposure
  • Concentrations over 1000 ppm cause immediate collapse with loss of breathing, even after inhalation of a single breath.

 

Contact us for help choosing the right H2S Sensor for your application

View our portable H2S Monitors HERE

View our fixed mount H2S Monitors HERE

 

Our full line of Hydrogen Sulfide (H2S) monitoring solutions are shown below

Pocket H2S, Model 300

Small, lightweight, and low cost.  Perfect for handheld personnel safety.

0-50 PPM range with integrated audible alarms in a package that weighs only 1 oz, makes this a perfect monitor for daily use.

Pocket H2S Sensor

GasAlert H2S

Rugged and versatile.  This feature rich sensor is capable, with integrated audible alarm and datalogging capabilities.

0-100 or 0-500 ppm range and intrinsically safe design make this a great monitor for personnel safety in hazardous environments.

GasAlert Extreme CO (GAXT-M-DL)

C-16 PortaSens

The C-16 allows for multiple gas sensors go be purchased and used.  With a fast response time, and features such as data logging, alarms, and min,max,avg recording, this is a great all around gas sensor for most every use.

In the C-16 page choose the sensor that is right for you. H2S sensors are available in a 0-50 or 0-500 ppm range.  Also choose other sensors that may be right for you.

The sensors used in the C-16 are also directly interchangeable with either the F-12, or D-12 toxic gas transmitters.  This makes the C-16 the perfect handheld device to use along with wall mounted toxic gas transmitters.

C-16 PortaSens II Gas Detector

Series-200 Monitor

The Series-200 Monitor Hydrogen Sulfide (H2S) heads are available in 0-10 ppm or 0-100 ppm ranges using a Gas Sensitive Electrochemical technology (GSE).

The Series-200 can be configured with a variety of other gas detecting heads to provide you with additional flexibility.

The Series-200 boasts:

  • audible alarm
  • min/max/avg recording
Aeroqual Series 200 with Sensor Head

Series-300 Monitor

The Series-300 Monitor Hydrogen Sulfide (H2S) heads are available in 0-10 ppm or 0-100 ppm ranges using a Gas Sensitive Electrochemical technology (GSE).

The Series-300 can be configured with a variety of other gas detecting heads to provide you with additional flexibility.

The Series-300 boasts:

  • audible alarm
  • min/max/avg recording
  • internal relays for external control of devices or alarms

Aeroqual Series 200 with Sensor Head

Series-500 Monitor

The Series-500 Monitor Hydrogen Sulfide (H2S) heads are available in 0-10 ppm or 0-100 ppm ranges using a Gas Sensitive Electrochemical technology (GSE).

The Series-500 can be configured with a variety of other gas detecting heads to provide you with additional flexibility.

The Series-500 boasts:

  • audible alarm
  • min/max/avg recording
  • internal relays for external control of devices or alarms
  • integrated data logging with industry leading desktop software

H2S monitor with datalogging

Series-900 Controller

The Series-900 Controller Hydrogen Sulfide (H2S) heads are available in 0-10 ppm or 0-100 ppm ranges using a Gas Sensitive Electrochemical technology (GSE).

The Series-900 can be configured with a variety of other gas detecting heads to provide you with additional flexibility.

The Series-900 boasts:

  • Versatile controller with 4-20mA output and RS-485 output
  • 2 alarm relays and 2 control relays that are user settable

S900 Aeroqual hydrogen sulfide monitor

F-12 Toxic Gas Detector

The F-12 allows for multiple gas sensors go be purchased and used.  The F-12 is configurable with options such as and intrinsically safe enclosure, remote mounted sensors and others.

In the F-12 page choose the sensor that is right for you. Hydrogen Sulfide sensor is available in a 0-50, or 0-500 ppm range.  Also choose other sensors that may be right for you.

ATI F12 Hydrogen Sulfide Monitor

D-12 Toxic Gas Transmitter

The D-12 allows for multiple gas sensors go be purchased and used.  The D-12 is designed for operation in hazardous areas. The cast aluminum housing for the D12 transmitter is rated for Class 1, Division 1, Group B, C, D locations and is UL, FM, and CSA certified.

In the D-12 page choose the sensor that is right for you. Hydrogen Sulfide sensors are available in a 0-50 or 0-500 ppm range.  Also choose other sensors that may be right for you.

D-12 Toxic Gas Detector
 

 

Contact us for help choosing the right H2S Sensor for your application


Phone: 605-368-1404    |    E-mail: sales@gas-sensing.com    |    1322 1st street    Hull, IA 51239    |    Contact Us    |    About Us