PPM–400ST Formaldehyde Meter Operation Manual
ensure a good seal around the instrument nozzle
apply gentle pressure to Calibration Standard against
the instrument when taking a sample.
4. Simultaneously press both
>
and
<
buttons. The
pump will be heard drawing a vapour sample and the
screen will briefly show
CAL
. Release the buttons.
5. When the pump stops, remove the calibration tube
and replace both yellow end plugs.
6. The display will show an increasing, flashing value
for 60 seconds, followed by
SEt
and
2.000
alternating.
7. Refer to the look-up table printed on the
Calibration Standard and use the thermometer
reading to find the required calibration value. For
example, at 21°C the Calibration Standard gives a
calibration value of 2.13 ppm.
8. Now use the
<
or
>
button to adjust the display
reading to the required concentration. In our example
we would use
<
to set
2.130
on the display.
9. Press the
$
button to store the calibration value.
The display will show
CAL
followed by
End
.
The PPM–400ST Formaldehyde Meter
will then
switch off automatically and the calibration procedure
is complete.
Fig 1.2 PPM
– 400ST Formaldehyde Meter with Calibration Standard Inserted
15
