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Toxic Gas and Oxygen Gas Detectors

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Toxic gas detectors and oxygen gas detectors detect the presence of gases in a specified area, and sound an alarm when they reach dangerous levels. Gas detectors are typically installed where there is a potential for a gas leak, and where unsafe gas levels pose an immediate danger to workers or equipment. Toxic gas detectors are widely used by industries including gas and oil, medical, mining, nuclear, construction, food and beverage and industrial.

How Do Toxic Gas Detectors Work?

Toxic gas detectors and oxygen gas detectors work by measuring the concentration of a specific gas in the air. RC Systems specializes in fixed gas detection with either remote or locally mounted sensors. One or more types of gas detectors might be used in the same area, depending on the different gases involved and the size of the work area.

Gas detectors are programmed with pre-set levels that vary depending on the type and concentration of gas being monitored. A sensor inside the toxic gas detector reads the gas levels, and when they rise above or fall below the specified level, an alarm activates. Sensors are made from electrochemical cells, and the alarm can be visual or audible. Readings can be sent via a digital signal or analog signal to a control room, and alarms can actuate local relays for operation of alarm safety devices such as horns, fans, valves, etc.


  • 2.4GHZ/900MHZ wireless with integral battery
  • Local calibration and real time event log
  • 15’ remote sensor option
  • Backlight Available
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  • QVGA LCD with stunning color graphics
  • Ethernet: Modbus TCP with web server
  • Dual Port Modbus RTU/relays option 
  • RS-485 remote sensor option up to 4000’
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  • Color backlit LCD Display
  • Display Color Changes with Alarm Status
  • Generation 2 Smart Sensor Compatible for increased signal stability
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  • 2-Wire 4-20mA (sink) with local  LCD graphic display
  • Gen 2 Smart Sensor
  • Local calibration and real time event log
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  • 3-Wire 4-20mA (source) with local backlit LCD graphic display
  • Local Calibration and real time event log
  • Single Port Modbus RTU/relays option 
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  • 2-Wire 4-20mA (sink) with local  LCD graphic display
  • Local calibration and real time event log
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  • Low Cost
  • 2-wire 4-20mA (sink)
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Using Oxygen Detectors to Monitor for Oxygen Depletion

Normal oxygen levels in the atmosphere hover between 19-23% but when they dip below that range, workers can experience drowsiness, nausea and rapid heartbeat. In the workplace, depletion of oxygen can result from dilution caused by nitrogen, helium and other inert gases commonly used in laboratory, pharmaceutical or semiconductor applications.

Extremely low oxygen levels below 12% can cause loss of consciousness and in extreme cases, death. Oxygen detectors help prevent these dangers by accurately monitoring oxygen levels, and triggering an alarm when they drop below 19.5%, which is the current OSHA-mandated level.

Preventing Workplace Dangers with Toxic Gas Detectors

Some toxic gases have a distinct smell where others, such as carbon dioxide, have no smell and cannot be detected by humans. The presence of toxic gases at high levels presents serious health and safety risks including explosion, fire, and illness or death.

Toxic gas detectors help prevent issues by monitoring potential leakage areas for harmful gas levels. They are commonly used on oil rigs and in chemical plants and manufacturing facilities where toxic fluids and gases are being stored and processed.

Oxygen and Toxic Gas Detectors for Monitoring A Variety of Gases

RC Systems offers several different types of gas detectors including toxic gas detectors and oxygen gas detectors. Each SenSmart oxygen or toxic gas detector model is designed to deliver optimum price, performance and versatility to fit any situation.

Field swappable smart electrochemical sensors are available for Oxygen (O2), Hydrogen Sulfide (H2S), Sulfur Dioxide (SO2), Ammonia (NH3), Chlorine (Cl2), Hydrogen Fluoride (HF) and many other toxic gases. SenSmart gas detectors offer Important features including heated sensors (SenSmart 3100 & SenSmart 6100), Ethernet / Web Server (SenSmart 6100) and wireless communications with the easy to install SenSmart 7100. For lowest price points consider the SenSmart 1100 and 2100 4-20mA loop powered gas detectors.

To meet your unique gas detection requirements, each type of gas detector we offer can be custom configured based on the following criteria:

  • Area classification
  • Enclosure type
  • Output option
  • Gas type
  • Sensor type
  • Sensor range
  • Sensor location

View the individual product listings below to learn more about our oxygen detector and toxic gas detector options or contact one of our representatives to discuss your gas detection requirements. We also have a FAQ page that provides answers to common questions regarding our toxic gas detectors.

Our gas detection experts are also available 24/7 to provide you with technical service and support once your toxic gas detector is installed.

Hydrogen Sulfide (H2S)

H2S is a colorless toxic gas which can cause adverse effects on the human body as low as 2ppm, and can be fatal at levels as low as 100ppm with prolonged exposure. H2S is naturally occurring during the chemical breakdown of organic compounds in the absence of Oxygen. Typical areas where H2S sensing, detection and monitoring are a concern include: oil refineries, wastewater facilities, oil and gas wells, tanks and compressor stations.

Selecting the Right Type of Gas Detector for Your Application

Important things to consider when selecting a toxic gas detector include:

  • Reliability: This is perhaps the most crucial because oxygen detectors that frequently malfunction or have a short product life can put your workplace at danger.
  • Features & Usability: You want to select an oxygen gas detector that is durable, easy to install and can withstand the conditions of your operating environment. The device should also fit your data recording requirements and be easy to maintain and calibrate.
  • Reading Sensitivity & Accuracy: Some gas detection applications require a higher level of sensitivity than others, so make sure your toxic gas detector can register readings within your required range.
  • Alarm Response Time: When it comes to oxygen or toxic gas reaching dangerous levels, every second counts. Make sure the gas detector you select has a response time that allows you enough time to react and remedy the issue.
  • Sensitivity to Environmental Factors: Depending on the operating environment, a gas detector might be exposed to heat, moisture, humidity or other gases. It is critical that these factors do not affect the reliability of the readings and results provided by your toxic gas detector.

Learn More About the Various Types of Gas Detectors Offered by RC Systems

We offer a range of toxic gas detectors and oxygen gas detectors to meet your safety requirements. Contact us today to learn more about our toxic gas detectors and other products including alarm controllers, gas detection accessories and more.