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AO Study 2020 > *TB 150- Combustible Gas Detector > Flashcards

*TB 150- Combustible Gas Detector Flashcards

1
Q

What 4 gas-specific sensors does the combustible gas indicator have?

It also has a catalytic sensor to detect what? (5th detectable gas)

A

H.O.C.H.E

  1. Hydrogen sulfide(H2S)
  2. Oxygen (O2)
  3. Carbon monoxide (CO)
  4. Hydrogen cyanide (HCN)
  5. Explosive gases (methane CH4)
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2
Q

Before and after every use, the combustible gas indicator needs to be exposed to _____.

A

Fresh air

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3
Q

Who performs Fresh air calibrations for the combustible gas indicator?

A

In field emergency responders

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4
Q

Gas specific calibrations are performed for the combustible gas indicator by WHO every ___ months and anytime the meter’s start-up self test indicates a sensor problem?

A

Hazmat squad personnel

6 months (180 days)

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5
Q

The manufacturer does not guarantee the combustible gas indicator to be intrinsically safe in oxygen-enriched atmospheres with greater than ___% oxygen.

A

23.5%

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6
Q

How many gases will the Dräger X-am 5000 combustible gas meter detect?

A

5

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7
Q

The X-am 5000 combustible gas indicator displays gases in parts per _____.

A

Million

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8
Q

Once inside the combustible gas indicator, the flammable gases or vapors are burned catalytically at a heated detector element, called the ______.

A

Pellistor

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9
Q

The combustible gas indicator sensor is calibrated to detect what explosive gas?

It will detect all explosive hydrocarbon atmospheres such as pentane, butane, propane etc.

A

Methane

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10
Q

WHEN USING THE COMBUSTIBLE GAS INDICATOR, IMMEDIATELY LEAVE ANY AREA WITH AN OXYGEN READING GREATER THAN ____%, THERE IS DANGER OF EXPLOSION!

A

23.5%

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11
Q

What chemical shall not be stored near or used on the combustible gas indicator?

A

Silicone spray

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12
Q

The combustible gas indicator is not intended for use in chemical atmospheres with wide flammability ranges such as Hydrogen or ______

A

Acetylene.

If you suspect the presence of a gas with a very wide flammability range and your CGI is getting readings for methane you must immediately vacate that environment and request LAFD Hazmat

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13
Q

The X-am 5000 combustible gas indicator is set to alarm at ___% of the LEL for the A1 alarm and alarm at ___% of the LEL for the A2 alarm.

A

10 and 20%

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14
Q

To turn on the combustible gas indicator, Press and hold the OK key for approximately ___ seconds until the countdown

A

3

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15
Q

When turning on the combustible gas indicator, check for the warning symbol (!)

Can the device be operated normally with the warning symbol on the display?

A

Yes.

If the warning symbol does not disappear automatically during operation, contact the closest HazMat Squad to evaluate/calibrate the meter.

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16
Q

Report all combustible gas indicator readings to the incident commander through the _______.

A

Hazmat group supervisor

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17
Q

Peak values on the combustible gas indicator must be cleared (before or after) an incident?

A

Before

18
Q

Combustible gas indicators:
Sensors which have not warmed up or which are faulty will prevent a fresh air calibration and the unit will display the message “____” with the symbol (!) signifying a warning message.

A

159

19
Q

Combustible gas indicator:

Which level alarm (A1 or A2) can be acknowledged and silenced

A

Pre-alarm A1

20
Q

Combustible gas indicator:
When the battery “pre-alarm”(A1) activates, the 1/3 full battery symbol will flash and the battery will last approx ____ minutes.

A

20 min

21
Q

Combustible gas indicator:
When the battery “main alarm”(A2) activates, the empty battery symbol will flash and the battery will last approx ____ sec.

A

10 sec

22
Q

When the batteries are replaced on the combustible gas indicator, it will take up to ___ minutes for the device to warm-up.

A

30

23
Q

How often is the combustible gas indicator inspected daily, weekly, or monthly?

A

Weekly

24
Q

Combustible gas indicator batteries shall be replaced when?

A

If batteries less than 3/4 full

25
Q

What two checks are required during the weekly checks of the combustible gas indicator?

A

Batteries and performing a fresh air calibration

26
Q

Combustible gas indicator:

When does a bump test need to be done by hazmat personnel?

A

Every time the CGI is used during an incident with active readings.

27
Q

What is the process for turning in a combustible gas indicator for repair?

A

Notify hazmat first, they will try to fix the CGI. If unsuccessful, station responsible will send in to S&M for repair.

28
Q

Short Term Exposure Limit (TLV-STEL):
An acute or spot exposure for a duration of ___ minutes, whereas workers would not suffer irritation, irreversible tissue damage, or impairment.

A

15

29
Q

Which toxic gas detectable by the combustible gas indicator causes Eye Irritation, Sore Throat, Cough, Shortness of Breath, Loss of Sense of Smell, Pulmonary Edema and Nausea?

A

Hydrogen Sulfide H2S

30
Q

Which toxic gas detectable by the combustible gas indicator causes Convulsions, Vomiting, Rapid Heart Rate, Restlessness, Rapid Breathing, Dizziness, Weakness, Headache, and Nausea?

A

Hydrogen Cyanide HCN

31
Q

Which toxic gas detectable by the combustible gas indicator causes Abnormal Cherry Red Hue, Syncope, Fatigue, Headache, Nausea, Vomiting, Dizziness, Confusion, and Visual Disturbance?

A

Carbon Monoxide CO

32
Q

Combustible gas indicator:

1st and 2nd Alarm numbers for oxygen?

A

19.5% and 23.5%

33
Q

Combustible gas indicator:

1st and 2nd Alarm numbers for Carbon Monoxide (CO)?

A

25 ppm and 50 ppm

34
Q

Combustible gas indicator:

1st and 2nd Alarm numbers for Hydrogen Sulfide (H2S)?

A

10 ppm and 15 ppm

35
Q

Combustible gas indicator:

1st and 2nd Alarm numbers for Hydrogen Cyanide (HCN)?

A

4.70 ppm and 10 ppm

36
Q

Combustible gas indicator:

1st and 2nd Alarm numbers for Methane (CH4)?

A

10% and 20%

37
Q

The combustible gas indicator may display incorrect readings in oxygen-poor atmospheres with less than ___% oxygen

A

10

38
Q

Hydrogen has a flammability range of ___%-___% and acetylene has flammability range of ___%-___%.

A

4 to 75

2.5 to 100

39
Q

The flammability range of methane is between ___%-___%

A

5 to 15

40
Q

5-gas:

batteries last no more than ___ or ____ weeks.

What kind of batteries?

A

2 or 3 weeks

This device requires 2 – AA alkaline

AO Study 2020 (101 decks)

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