
GDS-68XP Operation & Maintenance Manual, Revision 3.5
Page 34
SENSOR
REPLACEMENT
If
a
sensor
shows
FAULT,
does
not
respond
to
gas
or
can
no
longer
be
calibrated,
it
should
be
replaced.
Use
type
10
‐
98XX
‐
Ryyyy
sensors,
where
the
XX
is
gas
type
(Fig.
3
‐
1)
and
yyyy
is
range
(25
=
“0025”).
Step
1:
Turn
off
DC
power.
Step
2:
Disconnect
the
sample
inlet
tube
at
the
sensor
flow
cell
Step
3:
Disconnect
the
sample
exhaust
tube
at
the
flow
cell.
Step
4:
Unscrew
the
sensor
flow
cell
and
sensor
head
cover
Step
5:
Pull
straight
down
to
remove
the
existing
sensor.
Step
6:
Compare
the
new
sensor
with
the
old
sensor
and
verify
identical
part
numbers
Step
7:
Install
the
new
sensor
by
aligning
the
arrow
on
the
sensor
with
the
arrow
on
the
sensor
head
and
pushing
straight
up.
Step
8:
Reassemble
the
sensor
head
cover
and
flow
cell
and
reattach
the
sample
inlet
and
outlet
tubing.
Step
9:
Apply
power,
allow
the
sensor
to
warm
up
for
several
hours.
Step
10:
Perform
a
complete
calibration.
1
2
4
3
5
6
7
8