120-00011 Rev. New
Halimeter
PLUS User Manual
7/15/2020
16
Section 5 – Taking Breath Samples
After powering up the Halimeter
PLUS, select MEASURE from the MAIN MENU by
pressing the
RIGHT ARROW
button. This will open SENSOR STABILIZING MODE and a
5-minute timer will elapse. Upon the timer elapsing, the instrument will automatically enter
OFF MODE.
From OFF MODE, press the
ENTER
button to advance to ON MODE. The pump will now
turn on. Allow the sensor several minutes to stabilize to ambient flow. You may notice the
flow rate reading fluctuates for several seconds before stabilizing at 200 mL/m. This
fluctuation is normal.
Once the reading has stabilized, the instrument is ready to be zeroed.
5.1 ZEROING THE HALIMETER
PLUS
It is always a good idea to zero the Halimeter
PLUS prior to sampling. To accomplish this,
ensure the unit is in ON MODE and has been allowed to stabilize in this mode for several
minutes. Confirm that the flow rate has settled at 200 mL/m and the PPB display is not
rising or falling significantly. Zero the instrument as follows:
-
Press the
UP ARROW
button. The ZERO
indicator will now be highlighted indicating
ZERO MODE is active.
-
Press the
ENTER
button. “Set ZERO” will
display under the PPB display for 3
seconds indicating the display has been
zeroed.
-
Press the
DOWN ARROW
button to exit
ZERO MODE.
The instrument is now ready for sampling.
