Section 5: Integrated Gas Sampling
Airmetrics
35
5 INTEGRATED GAS SAMPLING
MiniVol samp ling procedures for all non-reactive gases are the same. It should also
be noted that the M iniVol sim ply collects a gas sam ple. Ana lyzing a g as sam ple
must be done se parately w ith the prop er gas an alyzing e quipm ent.
Consumables
No consumables are needed except for the occasional replacement Tedlar® bag
should one become d amaged. Contact A irmetrics for replacement bags.
Siting Req uiremen ts
Siting recommendations in this manual conform to the U. S. Environmental
Protection Agency requirements as stated in the U. S. Code of Federal Regulations
(40 CFR part 58, Appendix E). When operating the sampler in locations under
another jurisdiction, the operator should follow the appropriate guidelines.
As with particulate matter sampling, the MiniVol should be positioned with the
intake up ward an d located in an uno bstructed area at leas t 30 cm fr om an y obstacle
to air flow. A ccessibility to the unit un der all we ather con ditions, alon g with sa fety
and security of the monitoring personnel and equipment, should be prime
considerations.
Attach ing the M ountin g Cra dle
Mou nt the M iniVol cra dle onto a standard 1 1/4 inch antenna mast or c ompa rable
metal tubing, which itself is strapped securely to another supporting
structure
)
utility pole, parking m eter, fence post,
etc
. (see Figure 4.1).
Available separately from Airmetrics is a Y-Bracket Assembly for pole mounting
which provides a mast for attachment of the mounting cradle.
Airmetrics MiniVol Users Guide
36
Airmetrics
Figure 5.1.
Tubing Configuration for Integrated Gas Sampling
Mode
Preparing the Sampler
To collect integrated gas samples, the sampler must be fitted with the optional
valve driver board. If your original order specified integrated gas sampling
attachments, the sampler arrived prefitted for gas sampling. To prepare for the gas
sampling, you need only change the bale bar, attach the bag canisters, and turn on
the Valve Driver Board. However, if you wish to retrofit the sampler for integrated
sampling, you must make several minor modifications to the sampler body and
control board. (C ontact Airme trics for parts and inform ation on this proced ure).
The gas sampling tubing configuration is illustrated in Figure 5.1.
O
PERATION
M
ODES
-
S
TANDARD
M
ODE OR
O
VERLAP
M
ODE
In
Standard Mode
the sampler can be set to take samples at different times during
which either one or two bags can be filled. In this mode, only one bag can be filled
during a given period.
