*TB 150- Combustible Gas Detector Flashcards
What 4 gas-specific sensors does the combustible gas indicator have?
It also has a catalytic sensor to detect what? (5th detectable gas)
H.O.C.H.E
- Hydrogen sulfide(H2S)
- Oxygen (O2)
- Carbon monoxide (CO)
- Hydrogen cyanide (HCN)
- Explosive gases (methane CH4)
Before and after every use, the combustible gas indicator needs to be exposed to _____.
Fresh air
Who performs Fresh air calibrations for the combustible gas indicator?
In field emergency responders
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?
Hazmat squad personnel
6 months (180 days)
The manufacturer does not guarantee the combustible gas indicator to be intrinsically safe in oxygen-enriched atmospheres with greater than ___% oxygen.
23.5%
How many gases will the Dräger X-am 5000 combustible gas meter detect?
5
The X-am 5000 combustible gas indicator displays gases in parts per _____.
Million
Once inside the combustible gas indicator, the flammable gases or vapors are burned catalytically at a heated detector element, called the ______.
Pellistor
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.
Methane
WHEN USING THE COMBUSTIBLE GAS INDICATOR, IMMEDIATELY LEAVE ANY AREA WITH AN OXYGEN READING GREATER THAN ____%, THERE IS DANGER OF EXPLOSION!
23.5%
What chemical shall not be stored near or used on the combustible gas indicator?
Silicone spray
The combustible gas indicator is not intended for use in chemical atmospheres with wide flammability ranges such as Hydrogen or ______
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
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.
10 and 20%
To turn on the combustible gas indicator, Press and hold the OK key for approximately ___ seconds until the countdown
3
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?
Yes.
If the warning symbol does not disappear automatically during operation, contact the closest HazMat Squad to evaluate/calibrate the meter.
Report all combustible gas indicator readings to the incident commander through the _______.
Hazmat group supervisor
Peak values on the combustible gas indicator must be cleared (before or after) an incident?
Before
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.
159
Combustible gas indicator:
Which level alarm (A1 or A2) can be acknowledged and silenced
Pre-alarm A1
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.
20 min
Combustible gas indicator:
When the battery “main alarm”(A2) activates, the empty battery symbol will flash and the battery will last approx ____ sec.
10 sec
When the batteries are replaced on the combustible gas indicator, it will take up to ___ minutes for the device to warm-up.
30
How often is the combustible gas indicator inspected daily, weekly, or monthly?
Weekly
Combustible gas indicator batteries shall be replaced when?
If batteries less than 3/4 full
What two checks are required during the weekly checks of the combustible gas indicator?
Batteries and performing a fresh air calibration
Combustible gas indicator:
When does a bump test need to be done by hazmat personnel?
Every time the CGI is used during an incident with active readings.
What is the process for turning in a combustible gas indicator for repair?
Notify hazmat first, they will try to fix the CGI. If unsuccessful, station responsible will send in to S&M for repair.
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.
15
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?
Hydrogen Sulfide H2S
Which toxic gas detectable by the combustible gas indicator causes Convulsions, Vomiting, Rapid Heart Rate, Restlessness, Rapid Breathing, Dizziness, Weakness, Headache, and Nausea?
Hydrogen Cyanide HCN
Which toxic gas detectable by the combustible gas indicator causes Abnormal Cherry Red Hue, Syncope, Fatigue, Headache, Nausea, Vomiting, Dizziness, Confusion, and Visual Disturbance?
Carbon Monoxide CO
Combustible gas indicator:
1st and 2nd Alarm numbers for oxygen?
19.5% and 23.5%
Combustible gas indicator:
1st and 2nd Alarm numbers for Carbon Monoxide (CO)?
25 ppm and 50 ppm
Combustible gas indicator:
1st and 2nd Alarm numbers for Hydrogen Sulfide (H2S)?
10 ppm and 15 ppm
Combustible gas indicator:
1st and 2nd Alarm numbers for Hydrogen Cyanide (HCN)?
4.70 ppm and 10 ppm
Combustible gas indicator:
1st and 2nd Alarm numbers for Methane (CH4)?
10% and 20%
The combustible gas indicator may display incorrect readings in oxygen-poor atmospheres with less than ___% oxygen
10
Hydrogen has a flammability range of ___%-___% and acetylene has flammability range of ___%-___%.
4 to 75
2.5 to 100
The flammability range of methane is between ___%-___%
5 to 15
5-gas:
batteries last no more than ___ or ____ weeks.
What kind of batteries?
2 or 3 weeks
This device requires 2 – AA alkaline
