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AO Study Material 2020 Test > TB 150 - Drager 5 Gas > Flashcards

TB 150 - Drager 5 Gas Flashcards

(86 cards)

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1
Q

What model drager gas meter does the LAFD use?

A

Drager X-am 5000

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2
Q

What is the 5 gas meter designed for?

A

Personnel monitoring and confined space applications

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3
Q

What incidents will the 5 gas provide beneficial information for?

A 
Natural gas/methane leak
Explosions
Confined space
Trench rescue
Metro rail
Oxygen enriched/deficient atmosphere
Hazmat
Overhaul
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4
Q

What 4 gas specific sensors and 5th catalytic sensor is the drager equipped with?

A 
Carbon monoxide (CO)
Oxygen O2
Hydrogen sulfide (H2S)
Hydrogen cyanide (HCN)
Explosive vapors (methane)
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5
Q

The additional sensor on the drager was added due to significant levels of what during overhaul?

A

Hydrogen cyanide sensor

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6
Q

The 5 gas meter is what type of monitor meaning it does not have a mechanical pump to draw in air samples?

A

Passive monitor

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7
Q

How does the meter sample air?

A

Air passes directly over gas entry ports

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8
Q

Due to some gases being heavier, lighter, or stratify toward middle, it is extremely important to move meter in what directions as you monitor unknown atmospheres?

A

High, low, left and right

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9
Q

Is the drager intrinsically safe, resistant to electromagnetic interference, water, dust, impact and vibrations?

A

Yes

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10
Q

Before and after use, the drager needs to be exposed to what for calibration?

A

Fresh air

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11
Q

Also, to maintain its calibration, the drager needs to be exposed to known concentrations of specific what periodically?

A

Known concentrations of specific poisonous gases

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12
Q

Fresh air calibrations are performed by who in the field?

A

Emergency responders

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13
Q

Gas specific calibrations are performed by hazmat squad personnel how often and anytime the meters start up self test indicates a sensor problem?

A

6 months

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14
Q

Oxygen, carbon monoxide, hydrogen sulfide and hydrogen cyanide are detected using what type of sensors?

A

Electrochemical sensors

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15
Q

The current in which the gases are diffused into the sensor where it is oxidized and reduced is computed and converted into what measurement which is then displayed on the screen on the drager?

A

Parts per million (PPM)

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16
Q

At start up, the drager goes through a testing sequence to evaluate the health of each sensor, if they fall out of range they will not appear on the screen and what symbol in the upper right hand corner signifies a system failure in the unit?

A

“X”

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17
Q

The meter must not be used if what symbol is displayed in the upper right corner of the screen?

A

“X”

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18
Q

If an “X” symbol is on the upper right hand screen who must be contacted for evaluation and calibration of meter

A

Closest hazmat squad

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19
Q

The gas concentration on the drager is determined by the bridge voltage of the sensor, it is given in % of what limit?

A

LEL (lower explosive limit)

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20
Q

The 5 gas meter is calibrated to methane but will detect all explosive hydrocarbon atmospheres such as what 3 gases?

A

Pentane, butane, and propane (will display readings for methane)

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21
Q

The drager may display incorrect readings in oxygen poor atmospheres with less than what percentage of oxygen because the sensor requires oxygen from ambient air to burn combustible vapors?

A

10%

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22
Q

The manufacturer does not guarantee the drager to be Intrinsically safe in oxygen-enriched atmospheres greater than what percent?

A

23.5% oxygen

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23
Q

The drager sensor (combustible gas sensor) is what model?

A

CatEx 125

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24
Q

The combustible gas sensor (catEx 125) can be damaged by what 4 chemicals?

A

Volatile silicone, sulfur, heavy metal compounds or halogenated hydrocarbons

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25
You should immediately leave an area with an oxygen reader greater than what percentage due to the danger of explosion (oxygen-rich atmosphere)?
23.5%
26
Of the 4 damaging chemicals to the drager, which one is routinely found in the fire station and should not be stored near it?
Silicone (spray)
27
The 5 gas is not intended for use in chemical atmospheres with wide flammability ranges with what 2 chemicals because they can damage the catEx 125 sensor?
Hydrogen or acetylene
28
What is the flammability range for hydrogen?
4% to 75%
29
What is the flammability range for acetylene?
2.5% to 100%
30
If you suspect the presence of gas with high flammability range and the 5 gas is getting readings for what gas you must immediately vacate and request an LAFD hazmat resource?
Methane
31
What is the flammability range of methane? (Explosive range)
5% to 15%
32
The drager is set to alarm at what percentage for the LEL of methane for the A1 alarm?
10%
33
The drager is set to alarm at what percentage for the LEL of methane for the A2 alarm (doubles A1)?
20%
34
An alarm at 20% of the LEL is what percentage away from the methane LEL of 5% (explosive range)?
80%
35
The A1 and A2 alarm levels were purposefully set at such low levels of concentration to provide a what between time a hazardous gas is detected and time an actual flammable atmosphere exits?
Buffer
36
Are flammability range and explosive range the same (synonymous)?
Yes
37
To turn on drager hold the “OK” button for how many seconds?
3 seconds
38
To shut the drager off, hold what buttons into countdown 3, 2, 1 is the display has elapsed at the same time the visual, audible and vibration alarms are activated for a short time?
“OK” and “+” buttons
39
Can the device be operated normally with the warning symbol on the display (!)?
Yes
40
If the warning symbol (!) does not disappear automatically during operation who must be contacted for evaluation/calibration of drager?
Closest hazmat squad
41
Before use, you should perform a what calibration and clear what?
Fresh air calibration, clear peak values
42
Before use check that the gas sensor area is not occluded with what 3 things?
Debris, tape, or plastic bag
43
If using the drager as a detection device, do not enter without what?
Full PPE and SCBA with facepiece
44
Press the “OK” key for how many seconds for peak value display for the highest readings the meter has been exposed to since the last time the values were cleared?
2 seconds
45
After pressing the “OK” button for 2 seconds to view previous peak values, the device will automatically return to measuring mode if no key is pressed within how many seconds?
10 seconds
46
Peak values must be cleared before an incident and readings must be documented at what 2 times?
Following an incident and prior to clearing values
47
To clear peak values, while in measuring mode press the “+” button how many times, select icon from quick menu by pressing the “+” button and then the “OK” button?
3 times
48
The peak values will be displayed and can be cleared by pressing and holding the “OK” button for how many seconds?
5 seconds
49
The what calibrations is used to improve the zero point accuracy of the drager?
Fresh air calibration
50
All sensors are included in the fresh air calibration with the O2 sensor set at what percentage and all other set at 0?
20.9%
51
Sensors which have not warmed up or which are faulty will prevent the fresh air calibration and the unit will display what message with the symbol (!) signifying a warning message?
159
52
After the meter has warmed press the what button 3 times, select the fresh air calibration symbol?
“+”
53
If a fault occurs during fresh air calibration, what fault message appears in the display?
“- -“
54
If a fault message occurs, repeat fresh air calibration and if it cannot be calibrated, contact who?
Closest hazmat squad
55
Pre alarms for (A1) are indicated by single intermittent activation of what 3 alarms?
Audible, visual, and vibration alarms
56
The pre alarm (A1) will reset itself if what drops below alarm threshold?
Concentration
57
After acknowledging the A1 alarm by pressing “OK”, what 2 alarms are switched off and what remains?
Audible and vibrations switched off, visual alarm continues to flash
58
Main alarms (A2) are indicated with what intermittent activation of audible, visual, and vibration alarms?
Double intermittent
59
Main alarms are what and cannot be acknowledged or cancelled?
Self-latching
60
After leaving the area and the concentration drops below the A2 alarm threshold, pressing what will switch off the alarm messages?
“OK”
61
The battery pre-alarm (A1) is indicated by what intermittent activations of audible, visual, and vibrations alarms?
Single intermittent
62
For the battery alarm, the what symbol (fraction) will flash on the right side of the display?
1/3 battery symbol
63
When the 1/3 battery symbol flashes, the battery will still last approximately how many minutes?
20 minutes
64
The battery main alarm (A2) is indicated by what intermittent activation of audible, visual and vibration alarms and cannot be acknowledged or cancelled?
Double intermittent
65
After the main battery alarm (A2) activates the device will automatically switch off after how many seconds?
10 seconds
66
Field testing has shown batteries last no more than how many weeks?
2 to 3 weeks
67
How many and what type of batteries does the drager take?
2 AA alkaline batteries
68
To expose the batteries, loosen what size Allen head bolt on the power pack and slide the pack away from the unit?
2mm Allen head bolt
69
When the batteries are replaced, it will take up to how many minutes for the device to warm up?
30 minutes
70
After each use what 4 things should be done to the drager?
Fresh air calibration Fault symbol should not display Document and clear peak values Bump test should done at earliest convenience
71
A bump test is required anytime the meter registers readings after being used in what (not after weekly)?
Suspected IDLH
72
Meters used in what applications run the risk of sensor poisoning?
Industrial
73
Batteries should be replaced during the weekly check if battery icon reads what level (fraction)?
3/4
74
To clean the device, a damp whatcan be used if wiping is necessary?
Damp sponge
75
Abrasive cleaning implements, cleaning agents, compressed air and cleaning solvents can destroy what filters and shall not be used?
Dust and water filters
76
The pre alarm and main alarm for oxygen will go off at what percentage?
A1: 19.5% A2: 23.5%
77
The pre alarm and main alarm for carbon monoxide will go off at what ppm?
A1: 25 ppm A2: 50 ppm
78
For carbon monoxide, how many ppm for an IDLH?
1200 ppm
79
The pre alarm and main alarm for hydrogen sulfide will go off at what ppm?
A1: 10 ppm A2: 15 ppm
80
For hydrogen sulfide, how many ppm for an IDLH?
100 ppm
81
The pre alarm and main alarm for hydrogen cyanide will go off at what ppm?
A1: 4.70 ppm A2: 10 ppm
82
For hydrogen cyanide, how many ppm for an IDLH?
50 ppm
83
The pre alarm and main alarm for methan will go off at what percentage?
A1: 10% A2: 20%
84
What is the term called that level a worker can be exposed to a chemical/substance for an 8 hour day/40 hour work schedule without adverse health effects?
Time weighted average (TWA)
85
Short term exposure limit (STEL) is an acute or spot exposure for a duration of how many minutes whereas workers should not suffer irritation, irreversible tissue damage, or impairment?
15 minutes
86
Recommended calibration interval for all chemical sensors is sensors is how many days?
180 days

AO Study Material 2020 Test (124 decks)

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