Notes prior to use
OPERATING PROCEDURE
1
2
3
MEASUREMENT
ON SAMPLING
COMPLERION OF
SAMPLING
Prepare Aspirating pump.
Connect the gas detector tube to the aspirating pump.
The sample gas must be drawn
through the gas detector tube in
the correct direction. Insert the
gas detector tube into the rubber
tube connector with the tube’s
directional arrow pointing toward
the pump.
Pull the handle.
Align the red line on the bottom
case and that on the shaft and
pull the pump handle to its full
100mL locking position. If the
sample calls for a half stroke, pull
out the pump handle until 50mL
line appears, and shaft will be
locked at 50mL.
Draw the sample gas.
Draw the sample gas for the
specified time at the desired
sampling point, and confirm with
the flow indicator that the sample
is completed. The sample time
required for each detector tube is
stated clearly in the instruction
sheet.
Return the handle.
When the sample is completed, turn
the handle 1/4 turn (90 degrees)
clockwise or counterclockwise to
unlock the handle. Confirm that
the handle remains extended. (If
the handle returns part way, the
sample is incomplete, and this
will cause a low reading). Some
detector tubes require extra pump strokes (i.e., more than 100mL of air).
In this case, push back the handle and repeat the operation.
Read the concentration.
Remove the gas detector tube from the aspirating pump after the
prescribed sample volume has been drawn. Read the concentration of
gas at the maximum end of the stain against the printed scale on the
detector tube. Some detector tubes require a temperature correction
using a table or correction coefficient provided in the instructions.
The operating procedure varies from one detector tube to
another. Before proceeding, read carefully the individual
instruction sheets provided in each box.
Some detector tubes require temperature correction using
tables provided in the instruction sheets. Be sure that the
tube temperature has reached equilibrium with the sample
area before drawing the sample.
When using detector tubes at pressure other than normal
atmospheric pressure, correction of the reading is
necessary. Refer to the section “MEASUREMENT AND
OPTIONS UNDER SPECIAL CONDITIONS.” To read the
tube scale directly, it is necessary that the pressure of the
sample gas is equal to that of aspirating pump.
When sampling high-pressure systems, first collect the
sample in a gas sampling bag (non-adsorbent material),
then use the pump to draw the sample from the bag.
Cut both ends of the gas detector tube.
Insert the tip of gas detector tube into the tip cutter and scratch the
tip of tube by rotating it for one
revolution, then pull it toward
you. (The glass tip can be
thrown away by removing the tip
cutter cap.)
Check the pump for leaks in accordance with “CHECKING PRIOR TO
USE”. (Refer to page 5)
