LaMotte Air Pollution Sampling & Measurement - Manual (Page 10)

HAND OPERATED SYRINGE PUMP
MODEL LG • CODE 1947
This manually operated syringe
pump is capable of drawing 50
cc of the test atmosphere through
the impinging apparatus by one
complete stroke of the syringe.
The pumping mechanism relies
upon the use of a special check
valve which assures that a positive
vacuum is formed on the upstroke
of the syringe. The check valve
also allows the expulsion of the
air sample as the plunger is
depressed.
Through the use of this mechanism a continuous sampling of the test
atmosphere is obtained as the plunger of the syringe is manually pulled
out and depressed.
A general purpose impinging apparatus is held in place by a special
holder on the barrel of the syringe. The short plastic tube of the
impinging apparatus is connected by flexible tubing to the intake
connection of the syringe. As the syringe plunger is pulled out, air is
drawn through the longer tube and bubbled into the absorbing solution.
The vacuum formed on the upstroke of the plunger draws air from
above the absorbing solution into the syringe chamber. When the
syringe plunger is depressed, the air is forced through the outlet or
exhaust of the check valve. After the syringe is in the downstroke position
it is ready for another 50 cc air sample.
INSTRUCTIONS
1.
Depress plunger to “0" position.
2.
Remove stopper assembly from impinging tube and pour the
designated amount of absorbing solution into the glass tube (refer
to individual test kit instructions to determine what amount of
absorbing solution is added to impinging apparatus).
3.
Replace stopper assembly. Connect flexible tubing to short tube
(outlet) of impinger assembly and to intake connections of syringe.
4.
Begin to sampling the test atmosphere by completing one complete
cycle (pulling out - depressing plunger). Twenty complete strokes on
the syringe per minute is equivalent to sampling the air at one liter
per minute (Lpm). Continue sampling until required volume of air
has been sampled (refer to individual test kit instructions).
10 Air Pollution Sampling & Measurement