©
2008
Gastech
Australia
Pty
Ltd
Page
38
APPENDIX
I.
Troubleshooting
Fault
Remedy
Fail
to
power
up
1.
Check
power
is
stable
24VDC
2.
Reset
power
supply
Display
blank:
1.
Check
voltage
at
the
D
‐
Guard
TM
end.
Voltage
must
be
at
least
10VDC
before
the
D
‐
Guard
TM
will
power
up.
If
Voltage
is
correct
restart
the
start
up
procedure
Sensor
fail
1.
Check
the
Gain
setting
as
the
incorrect
gain
setting
can
have
a
sensor
fail
single
before
the
end
of
the
life
of
the
sensor
2.
If
you
get
the
following
message
on
the
screen
“SENSORFAIL”.
This
is
due
to
the
sensor
signal
is
too
week
or
two
strong.
3.
Replace
sensor
Sensor
unstable
readings
1.
Check
gain
setting
on
sensor
as
a
too
high
gain
setting
can
result
in
unstable
reading.
2.
Replace
sensor
APPENDIX
II.
Factory
Setup
Note:
Before
proceeding
with
any
steps
in
this
section,
isolate
the
sensor
back
at
the
controller
so
the
D
‐
Guard
TM
unit
will
not
trip
or
create
any
alarms.
3.4
Calibrating
Zero/Full
Loop
Current
1.
With
the
D
‐
Guard
TM
unit
powered
on,
unscrew
the
calibration
plate
to
access
the
buttons
underneath.
2.
Place
a
jumper
cable
between
pins
1
and
2
on
the
10
‐
way
IDC
header.
Summary of Contents for D-Guard
Page 2: ......
