12
piCO
+
Operating Manual
English
www.bedfont.com
●
If the reading is between 15 and 25ppm,
the calibration value will be automatically
set in the instrument as 20ppm and
a tick
will be displayed to show a
successful calibration. If the reading is
outside these limits, calibration fails, and
a
is displayed (seeTroubleshooting
section – page 15).
●
The pointer and ‘return’ symbol re-appear
at the bottom of the display to indicate
that the process is complete and to allow
the user to double click the button to
return to the previous menu page.
● Turn off the gas flow, remove the D-piece
sampling system and disconnect the
calibration adapter from the D-piece
sampling system.
● Unscrew the fine control valve and flow
indicator from the gas can and store them
safely. If the valve is left attached to the
can, gas could escape.
●
The piCO
+
is now calibrated and ready
for use.
●
The piCO
+
will prompt the user to
calibrate the unit again in six months.
●
Single click the button to
scroll down to the 20ppm
gas cylinder symbol.
Double click the button to
select the symbol.
● Immediately open the fine
control valve and allow
the gas to flow at 1 litre per minute.
● To maintain this rate, adjust the flow so
that the ball in the flow indicator remains
at the middle line.
● Allow the gas to flow through the
instrument for up to 1 minute and
30 seconds to ensure accurate calibration,
again monitoring the rate of flow.
●
As the 20ppm CO
calibration gas is applied,
the displayed ppm reading
will rise. After 1 minute
and 30 seconds, or when
no further increase in the
reading occurs, the final
reading will be shown and
sampling will cease.
Calibration
(continued)
