5
TRACK GAS. The survey can now be done by observing the readings on the display
while the beeper is silent.
Notes:
•
Both background zero suppression and silencing of the beeper are only
applicable as long as the selector switch remains in the TRACK GAS
position. If the selector switch is moved to some other position and then
returned to TRACK GAS, TRACK GAS will operate in the normal way
(no background suppression and active beeper).
•
Since gas is lighter than air, track a pipe from above when possible.
•
The TRACK GAS mode uses more power. To conserve the batteries, use
the TRACK GAS display only when tracking a gas leak.
To Detect Carbon Monoxide
Carbon Monoxide in Ambient Air
*
Connect an appropriate probe to the water-block filter and turn selector switch to
position marked "PPM CO". The display shows
"CO"
for about 15 seconds.
*
After warm-up, the display shows the concentration of CO in parts per million (ppm).
If the air is clean (contains no carbon monoxide), the display should read zero. If it
does not, switch to "AUTO ZERO". After automatic adjustment of the zero is
complete (display shows
"End"
), return the switch to the "PPM CO" position.
Carbon Monoxide in Flue Gas
*
Connect the flue gas probe, with an attached flue gas filter, to the water-block filter on
the hose and turn selector switch to position marked "PPM CO". The display shows
"CO"
for about 15 seconds.
*
After warm-up, insert the probe into the flue and read the concentration of CO in parts
per million. A flue gas check of CO should take one minute or less. For every
minute of flue gas sampling allow the detector a minute of room air sampling to dry
the filters.
CAUTION:
The filter provided with the flue probe
must
be used to avoid interference by
nitrogen oxides present in combusted gas. A filter is good for about three
months of ordinary use. It should be replaced when about 90% of its purple
material has changed color to brown, or when it gets clogged or flooded (see
"Accessories and Spare Parts", Flue Gas Filter, Part No. FF-005).
Note:
The standard flue gas probe and filter are suitable for spot checks lasting a
minute or two. For measurements of CO in flue gas over longer periods use an
Extended Duty Flue Gas Probe and Filter (Part No. FP-012).
WARNING:
Do not touch the flue probe immediately after a measurement. Wait
until it cools. Running the instrument in air helps cool the probe.
