Ion Science Tiger Select - Manual (Page 16)

TIGER MANUAL Ion Science Ltd
Page 16 of 20
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Select mode routine
1. To enter Select mode press the Select soft key ( ) at this point the
pump will stop running. A screen will appear to prompt the fitting of a
pre-filter tube, this screen also indicates which gas is selected, ensure this
is Benzene.
2. Adjust the on screen temperature to the ambient using the Up and Down keys. Preferred temperature
units (
O
C or
O
F) are set on the Configuration screen of TigerPC.
3. Remove both ends of the pre filter tube using the tube opener tool.
This is done by inserting the tube in to the tube opener and twisting the
tube. A slight angle may be required to cut the glass.
Should the tube break up to the shoulder it must not be used as this
will damage the seals within tube holder when inserted.
4. Unscrew the cap of the tube holder, insert the tube in to the tube
holder cap ensuring the black arrow on the tube is pointing towards the
open end (towards the instrument). Screw the tube holder cap and the
tube on to the instrument.
5. Pressing the Enter key to start the test cycle. A count down timer will
indicate the remaining test time, and a live Benzene reading is displayed.
Please note that this live reading is for indication only. Only the final ready
at the end of the test cycle should be used as a reference. This final
reading will also be automatically data logged.
WARNING: If the Benzene reading exceeds 200 ppm the reading should be treated with caution.
Note, when using the Tiger Select to measure higher concentrations of Benzene the concentrations of other
hydrocarbons may also be high and the Pre-
filter’s tube capacity should be considered. As the Pre-filters
capacity is reached the tube will turn from a bright orange to “greenish brown”. If the colour changes beyond
the ¾ marking the Benzene concentration displayed may not be accurate, see figure 2. If the colour turns
past the ¾ mark, as long as the benzene reading is below the test limit (e.g., 200 ppm) the result still within
environmental compliance and the work activity can continue.
6. A 15 minute STEL can be carried out after the initial reading using the
same pre-filter tube. Press the ENTER to continue or press the Esc key to
return to the Tube test screen.
If H&S mode does not appear as an option it can be selected on the
configuration screen of TigerPC in the Tiger Select section. The STEL threshold is taken from the internal
gas table however some authorities have no published STEL level for Benzene so the instrument will not
alarm.
7. At the end of the STEL test the instrument will display the final reading which will be data logged. Press
the Esc key will return to TAC mode.
Pre-filter tubes must only be used for 1 single reading + 1 once STEL test only.
WARNING: Should the level of Benzene through the filter tube exceed 200
ppm the accuracy of the reading should be approached with caution.
Readings above 200 ppm are still displayed however ‘>200’ flashes in the
bottom left corner of the screen.
Important:
* The working temperature range of the Benzene pre-filter is between 2 to 40
o
c [JB4] . (35
o
C to 122
0
C)
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