PPM–400ST Formaldehyde Meter Operation Manual
1.3 Instrument Features
Fig 1.1 Instrument Diagram
Sampling Port
The brass sampling port is the inlet through which
the sample is drawn into sensor.
Battery
Compartment
The battery compartment is located beneath a cover
at the rear of the instrument. See Section 6.1 for
guidance on battery replacement.
Keypad
Four buttons operate the instrument; some of which
have multiple functions when used in combination.
The buttons are:
%
: On-Off
$
: Sample or select
>
and
<
: Move to next item or adjust current setting.
6
