LaMotte NITROGEN DIOXIDE IN AIR TEST KIT - Manual (Page 2)

USE OF THE OCTET COM PARA TOR
The Octet Comparator contains eight permanent
color standards. A test sample is inserted into the
openings in the top of the comparator. The sample
can then be compared to four color standards at
once, and the value read off the comparator. For
optimum color comparison, the comparator should
be positioned between the operator and a light
source, so that the light enters through the special
light-diffusing screen in the back of the comparator.
Avoid viewing the comparator against direct sunlight
or an irregularly lighted background.
USE OF THE ADAPTER ASSEMBLY
This test kit includes an adapter for restricting the flow of air through the
impinging apparatus. The adapter assembly consists of a 27 gauge
hypodermic needle (27336-01) which is fitted into a small plastic holder
(30410). A piece of plastic tubing (23609) is attached to the plastic
holder. By joining one end of the tubing to the intake portion of the
impinging apparatus, the flow of air is restricted to 0.2 Lpm. To sample the
test atmosphere at this rate for nitrogen dioxide, use the following
procedure:
1.
Attach adapter to intake of impinging apparatus.
2. Unscrew knob of flowmeter (counterclockwise - 6 complete turns
from closed position of flowmeter).
3. Turn switch to “ON” position. Follow recommended operating
procedure for nitrogen dioxide test.
NOTE:
The sampling period should not exceed 20 minutes for a
single determination of nitrogen dioxide when the adapter is in place
as damage might result to the pumping mechanism.
L Mott