Gas Ranger Flashcards
What mode do you use to pin point the source of a gas leak?
Sniff/Track Gas
5% gas by volume=how many PPM?
50,000 ppm
The meter Alarms at what % LEL and what % GAS?
LEL 10%
GAS 0.5%
What will the display indicate if the batteries running low?
Flashes “LO”- 1hr run time remaining
Steady time- Less than 1hr run time remaining
When should you switch from %LEL to %GAS?
When 100% LEL readings are reached, switch to %GAS
What 3 operational checks are conducted on the gas ranger?
Pump test
Zero test
Bump gas test
How do you conduct a pump test?
Select a scale and after the display shows a number, block the probe tip to display “bloc”
Warning: do not use detector if “bloc” fails to appear
How do you conduct a zero test?
If the detector does not read zero for gas and CO and 21% for oxygen in clean air, use “AUTO ZERO” and wait for “END” before using it.
Warning: on a gas call, AUTO ZERO outdoor, never indoors
How do you conduct a Bump Gas Test?
Sample “2 in 1” bump gas on the GAS scale for about 10 sec. The display should show more than zero. Repeat with CO scale.
Warning: If the detector does not respond, check operation and recalibrate.
While operating the GAS RANGER how do you locate a gas leak?
Select TRACK GAS and listen to the beeper or read display to track gas to its source. To zero TRACK GAS, press reset.
How do you silence beeper while attempting to locate gas?
Press RESET while switching from %GAS to TRACK GAS
While operating the GAS RANGER how do you measure gas in a bar hole?
Select %Gas and, if necessary, AUTO ZERO. Press RESET to display “go”. Put the probe in the bar hole and press RESET again to sample gas for a fixed period. At the end of this time, the detector will beep and the peak/sustained readings will display. Press RESET to return to %GAS readings.
While operating the GAS RANGER how do you detect CO in air?
Select PPM CO and, if necessary, AUTO ZERO. Sample location for at least 30 sec. If the air has “chemical” odors, use the flue gas probe and filter to get a better reading.
What will the screen display if the batteries need to be changed soon?
“Lo”
How do you conduct a Filter Check?
Inspect the dust and water-block filter and shake out loose dirt. If the filter is substantially discolored or has a hole in it, replace it.
How do you auto calibrate the GAS RANGER?
First Auto Zero in clean air. After “END”, block probe to display “bloc”. Unblock to display “go” and sample calibration gas until “CAL” appears on the display.
What is the sample calibration gas made of?
2.5% methane, 100ppm CO
Troubleshooting the GAS RANGER- if the problem is the display shows blank/“Lo” what’s the probable cause?
What action should be taken?
Prob cause-Batt are low/ones bad/ improperly inserted
Action- reinsert batteries with flat end first or replace them
Troubleshooting the GAS RANGER- if the problem is the display shows “bloc”
what’s the probable cause?
What action should be taken?
Prob cause- intake is blocked
Action- drain the probe and, if necessary, replace water block filter
Troubleshooting the GAS RANGER- if the problem is the display does NOT show “bloc” when the tip is blocked
what’s the probable cause?
What action should be taken?
Prob cause- a leak between the probe tip and the pump, or the pump is dirty
Action- disconnect the hose and block intake. If “bloc” still does not appear, repair instrument.
Troubleshooting the GAS RANGER- if the problem is the display shows “nogo” on auto zero
what’s the probable cause?
What action should be taken?
Prob cause- Gas/CO is present or the zero of the sensor has drifted.
Action- repeat in clean air after detector purge or Course zero in clean air (hold down RESET and switch out of and back into AUTO ZERO)
Troubleshooting the GAS RANGER- if the problem is the display shows “Fail”
what’s the probable cause?
What action should be taken?
Prob cause- a sensor (methane or oxygen) has failed
Action- replace sensors
