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Questions and Answers
Limitations: Tubes and pumps are ______-specific
Limitations: Tubes and pumps are ______-specific
manufacturer
No alarm system, therefore not recommended for ______ monitoring
No alarm system, therefore not recommended for ______ monitoring
continuous
Dependent upon operator’s interpretation of ______
Dependent upon operator’s interpretation of ______
results
Application can require longer periods of time in atmospheres for results to ______ (up to several minutes)
Application can require longer periods of time in atmospheres for results to ______ (up to several minutes)
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Many ______-sensitivities
Many ______-sensitivities
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Range of application is dependent on ______ and temperature
Range of application is dependent on ______ and temperature
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Multi-gas detectors use separate sensors for ______ and combustible atmospheres
Multi-gas detectors use separate sensors for ______ and combustible atmospheres
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Accidental power-off protection: requires the power-off button to be held continuously for at least 3-5 ______
Accidental power-off protection: requires the power-off button to be held continuously for at least 3-5 ______
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Portable field docking stations are also available for several models to facilitate ______
Portable field docking stations are also available for several models to facilitate ______
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More accurate than colorimetric tubes - accurate within +/- ______%
More accurate than colorimetric tubes - accurate within +/- ______%
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Gases recognized are ______-specific
Gases recognized are ______-specific
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Environmental conditions such as temperature, humidity, dust, dirt, and rough handling all contribute to premature sensor ______
Environmental conditions such as temperature, humidity, dust, dirt, and rough handling all contribute to premature sensor ______
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During underground exploration, gas testing should be performed at ______ or where conditions change.
During underground exploration, gas testing should be performed at ______ or where conditions change.
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Sampling at the top, middle, and bottom of a space must be done in accordance with ______ specifications.
Sampling at the top, middle, and bottom of a space must be done in accordance with ______ specifications.
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Sample every 1–2 metres (3–7 ft) due to the weights of gases. Some are lighter than air (methane), some are slightly lighter (carbon monoxide), and some are heavier than air (______).
Sample every 1–2 metres (3–7 ft) due to the weights of gases. Some are lighter than air (methane), some are slightly lighter (carbon monoxide), and some are heavier than air (______).
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Bump Testing and Calibration The most important elements of gas detector maintenance are function (“bump”) testing and ______.
Bump Testing and Calibration The most important elements of gas detector maintenance are function (“bump”) testing and ______.
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Manufacturers recommend that a bump test be performed on every instrument prior to each day’s ______.
Manufacturers recommend that a bump test be performed on every instrument prior to each day’s ______.
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Any time an instrument fails to respond properly during a bump test, a full ______ should be completed successfully prior to use.
Any time an instrument fails to respond properly during a bump test, a full ______ should be completed successfully prior to use.
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Colorimetric (Tube-style) indicators measure more than 200 organic and inorganic gases and vapours in the __________
Colorimetric (Tube-style) indicators measure more than 200 organic and inorganic gases and vapours in the __________
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The sealed glass tubes are filled with a granular material coated with a chemical that changes colour when it reacts to a particular gas or __________
The sealed glass tubes are filled with a granular material coated with a chemical that changes colour when it reacts to a particular gas or __________
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Before Use: Refer to manufacturer’s instructions for the particular tube type. Perform a pump leak test. Ensure the direction arrow is oriented toward the __________
Before Use: Refer to manufacturer’s instructions for the particular tube type. Perform a pump leak test. Ensure the direction arrow is oriented toward the __________
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Operation: A portable pump draws a known volume of air through a detector tube designed to measure the concentration. The colour Drager (L) and Gastec (R) colorimetric tubes change is then read on a scale printed on the __________
Operation: A portable pump draws a known volume of air through a detector tube designed to measure the concentration. The colour Drager (L) and Gastec (R) colorimetric tubes change is then read on a scale printed on the __________
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Measurement accuracy, limits of detection, interferences, temperature/humidity, shelf life, time period for which the colour stain is stable after __________
Measurement accuracy, limits of detection, interferences, temperature/humidity, shelf life, time period for which the colour stain is stable after __________
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Tube Storage and Shelf Life: Tubes have a shelf life. These expiration dates are printed on the box. Store properly by avoiding excessively low or high temperatures and direct __________
Tube Storage and Shelf Life: Tubes have a shelf life. These expiration dates are printed on the box. Store properly by avoiding excessively low or high temperatures and direct __________
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There are four categories of hazardous atmospheres: Toxic, Oxygen deficiency/Asphyxiating gases, Explosive/flammable gases or vapours, and ______
There are four categories of hazardous atmospheres: Toxic, Oxygen deficiency/Asphyxiating gases, Explosive/flammable gases or vapours, and ______
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Intrinsic Safety is a design applied to electrical equipment and wiring for hazardous locations based on limiting energy, both electrical and thermal, to a level below that required to ignite a specific hazardous atmospheric mixture. All personal protective equipment must be considered before any and all gas testing. Always check that any monitoring equipment or other electrical devices are ______
Intrinsic Safety is a design applied to electrical equipment and wiring for hazardous locations based on limiting energy, both electrical and thermal, to a level below that required to ignite a specific hazardous atmospheric mixture. All personal protective equipment must be considered before any and all gas testing. Always check that any monitoring equipment or other electrical devices are ______
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It is important to select gas detection equipment that fits the specific needs of the incident. Mine rescue gas detection involves the use of direct-reading instruments (DRI). These instruments provide information at the time of sampling, thus enabling rapid ______
It is important to select gas detection equipment that fits the specific needs of the incident. Mine rescue gas detection involves the use of direct-reading instruments (DRI). These instruments provide information at the time of sampling, thus enabling rapid ______
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Upon completion of the chapter on Gas Detection Instruments, the trainee shall be able to demonstrate competency in what gases could be encountered during an emergency response, selecting monitoring equipment and methods suitable for the incident, and practical skills for an effective gas detection ______
Upon completion of the chapter on Gas Detection Instruments, the trainee shall be able to demonstrate competency in what gases could be encountered during an emergency response, selecting monitoring equipment and methods suitable for the incident, and practical skills for an effective gas detection ______
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Rescue teams can determine the gases and vapours present in an atmosphere using a few different methods and tools. Intrinsic Safety is a design applied to electrical equipment and wiring for hazardous locations. The technique is based on limiting energy, both electrical and thermal, to a level below that required to ignite a specific hazardous atmospheric mixture. All personal protective equipment must be considered before any and all gas testing. Always check that any monitoring equipment or other electrical devices are ______
Rescue teams can determine the gases and vapours present in an atmosphere using a few different methods and tools. Intrinsic Safety is a design applied to electrical equipment and wiring for hazardous locations. The technique is based on limiting energy, both electrical and thermal, to a level below that required to ignite a specific hazardous atmospheric mixture. All personal protective equipment must be considered before any and all gas testing. Always check that any monitoring equipment or other electrical devices are ______
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Gas Detection Instruments chapter aims to equip trainees with the ability to select monitoring equipment and methods suitable for the incident, what gases could be encountered during an emergency response, and practical skills for an effective gas detection ______
Gas Detection Instruments chapter aims to equip trainees with the ability to select monitoring equipment and methods suitable for the incident, what gases could be encountered during an emergency response, and practical skills for an effective gas detection ______
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Study Notes
Limitations of Gas Detectors
- Tubes and pumps are application-specific
- No alarm system, therefore not recommended for continuous monitoring
- Dependent upon operator’s interpretation of results
Characteristics of Gas Detectors
- Accurate within +/- 5%
- Gases recognized are application-specific
- Multi-gas detectors use separate sensors for toxic and combustible atmospheres
Sensor Maintenance
- Environmental conditions such as temperature, humidity, dust, dirt, and rough handling all contribute to premature sensor failure
- Bump testing and calibration are the most important elements of gas detector maintenance
Bump Testing and Calibration
- Manufacturers recommend that a bump test be performed on every instrument prior to each day’s use
- Any time an instrument fails to respond properly during a bump test, a full calibration should be completed successfully prior to use
Colorimetric (Tube-style) Indicators
- Measure more than 200 organic and inorganic gases and vapours in the air
- The sealed glass tubes are filled with a granular material coated with a chemical that changes colour when it reacts to a particular gas or vapour
- Before use, refer to manufacturer’s instructions for the particular tube type and perform a pump leak test
Operation of Colorimetric Tubes
- A portable pump draws a known volume of air through a detector tube designed to measure the concentration
- The colour change is then read on a scale printed on the tube
Important Considerations
- Measurement accuracy, limits of detection, interferences, temperature/humidity, shelf life, time period for which the colour stain is stable after use
- Tube Storage and Shelf Life: Tubes have a shelf life, and expiration dates are printed on the box
Hazardous Atmospheres
- There are four categories of hazardous atmospheres: Toxic, Oxygen deficiency/Asphyxiating gases, Explosive/flammable gases or vapours, and Corrosive
- Intrinsic Safety is a design applied to electrical equipment and wiring for hazardous locations based on limiting energy, both electrical and thermal, to a level below that required to ignite a specific hazardous atmospheric mixture
Gas Detection Instruments
- Always check that any monitoring equipment or other electrical devices are intrinsically safe
- Mine rescue gas detection involves the use of direct-reading instruments (DRI) to provide information at the time of sampling
- The Gas Detection Instruments chapter aims to equip trainees with the ability to select monitoring equipment and methods suitable for the incident, what gases could be encountered during an emergency response, and practical skills for an effective gas detection programme
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Description
Learn about the limitations associated with gas detection tubes, including factors such as manufacturer specificity, lack of alarm system, operator interpretation dependency, and longer response times in certain atmospheres.
