Gas Ranger

Question 1

What mode do you use to pin point the source of a gas leak?

Answer 1

Sniff/Track Gas

Question 2

5% gas by volume=how many PPM?

Answer 2

50,000 ppm

Question 3

The meter Alarms at what % LEL and what % GAS?

Answer 3

LEL 10%

GAS 0.5%

Question 4

What will the display indicate if the batteries running low?

Answer 4

Flashes “LO”- 1hr run time remaining

Steady time- Less than 1hr run time remaining

Question 5

When should you switch from %LEL to %GAS?

Answer 5

When 100% LEL readings are reached, switch to %GAS

Question 6

What 3 operational checks are conducted on the gas ranger?

Answer 6

Pump test
Zero test
Bump gas test

Question 7

How do you conduct a pump test?

Answer 7

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

Question 8

How do you conduct a zero test?

Answer 8

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

Question 9

How do you conduct a Bump Gas Test?

Answer 9

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.

Question 10

While operating the GAS RANGER how do you locate a gas leak?

Answer 10

Select TRACK GAS and listen to the beeper or read display to track gas to its source. To zero TRACK GAS, press reset.

Question 11

How do you silence beeper while attempting to locate gas?

Answer 11

Press RESET while switching from %GAS to TRACK GAS

Question 12

While operating the GAS RANGER how do you measure gas in a bar hole?

Answer 12

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.

Question 13

While operating the GAS RANGER how do you detect CO in air?

Answer 13

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.

Question 14

What will the screen display if the batteries need to be changed soon?

Answer 14

“Lo”

Question 15

How do you conduct a Filter Check?

Answer 15

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.

Question 16

How do you auto calibrate the GAS RANGER?

Answer 16

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.

Question 17

What is the sample calibration gas made of?

Answer 17

2.5% methane, 100ppm CO

Question 18

Troubleshooting the GAS RANGER- if the problem is the display shows blank/“Lo” what’s the probable cause?

What action should be taken?

Answer 18

Prob cause-Batt are low/ones bad/ improperly inserted

Action- reinsert batteries with flat end first or replace them

Question 19

Troubleshooting the GAS RANGER- if the problem is the display shows “bloc”

what’s the probable cause?

What action should be taken?

Answer 19

Prob cause- intake is blocked

Action- drain the probe and, if necessary, replace water block filter

Question 20

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?

Answer 20

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.

Question 21

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?

Answer 21

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)

Question 22

Troubleshooting the GAS RANGER- if the problem is the display shows “Fail”

what’s the probable cause?

What action should be taken?

Answer 22

Prob cause- a sensor (methane or oxygen) has failed

Action- replace sensors