©
2008
Gastech
Australia
Pty
Ltd
Page
22
18.
Reconnect
the
power
socket
to
the
PCB
and
ensure
the
unit
powers
up.
19.
Confirm
that
the
housing
sealing
“O”
ring
is
fitted
and
in
good
condition
20.
Fit
lid
and
tighten
the
4
screws
using
a
4mm
Allan
key
tightening
the
housing
evenly.
21.
Recalibrate
the
sensor
as
per
the
“Software
Configuration
and
Calibration”
section
later
in
this
manual.
3.2
PCB
Jumpers
and
Calibration
If
fitting
a
replacement
PCB
or
changing
the
sensor
to
a
different
model,
there
are
some
hardware
jumpers
and
trim
‐
pots
that
may
need
adjustment.
Before
proceeding,
make
sure
the
sensor
is
isolated
to
prevent
any
false
alarms.
3.2.1
Isolate
Mode
The
isolate
mode
of
the
D
‐
Guard
TM
is
a
feature
which
you
can
isolate
the
sensor
for
maintenance
or
if
the
sensor
has
an
extended
stabilization
period.
First,
open
the
calibration
plate
by
unscrewing
the
two
thumb
screws
on
the
calibration
plate.
Note:
The
plate
is
designed
to
pivot
on
the
left
screw.
The
screws
are
different
length
and
will
stay
connected
to
the
plate.
The
screws
are
captive
to
the
plate
but
can
be
fully
removed.
Don’t
fully
remove
the
screws
as
you
may
lose
them.
Housing
“O”
ring
seal
Isolate
switch
in
the
non
‐
isolated
position
Summary of Contents for D-Guard
Page 2: ......
