
GDS-68XP Operation & Maintenance Manual, Revision 3.5
Page 27
GDS
‐
68XP
STARTUP
PROCEDURE
Before
start
up,
review
Chapter
4
(“Operation”)
for
information
on
operating
modes
and
indications
as
well
as
Chapter
6
(“Sequencer
Controls
and
Indicators”).
Figure
6
‐
3
provides
a
handy
reference
to
the
red
and
green
LEDs
(“L1”
and
“L2”)
that
indicate
the
current
status
of
the
sequencer
processor.
ITEM
NOTES
1
MAKE
SURE
SAMPLE
OUTLET
IS
CONNECTED
CLOSE
INLET
AND
FILTER
DRAIN
VALVES
SAMPLE
GAS
CAN
BE
DEADLY.
ALWAYS
MAKE
SURE
SAMPLE
OUTLET
IS
DIRECTED
TO
A
SAFE
AREA
2
SET
SEQUENCE
SWITCH
TO
“4”
SET
FOR
4
HOUR
SAMPLE
3
APPLY
24VDC
POWER
L1,
L2
FLASH
GASMAX
DISPLAY
ACTIVE
PUMP
ON,
PURGE
AIR
FLOWING
GDS
‐
68XP
WARMUP:
SENSOR
STABLE
+
15
MINUTES
DURING
WARMUP,
PERFORM
STEPS
4
‐
5
‐
6
BELOW
4
ADJUST
FLOW
METER
VALVE
FOR
0.5
LPM
ADJUST
FOR
½
LPM
PURGE
AIR
FLOW
5
CHECK
TIME
OF
DAY
CLOCK
FOR
TIMEZONE;
SET
HOST
NAME
AND
MEASUREMENT
NAME;
SET
ETHERNET
NETWORK
PARAMETERS
CHANGES
TO
NETWORK
SETTINGS
ARE
NOT
RECOGNIZED
UNTIL
NEXT
POWER
‐
UP
SEQUENCE.
RETURN
TO
STEP
3
IF
CHANGED
6
OPTIONAL:
VERIFY
4
‐
20MA
SIGNAL
TO
REMOTE
DCS
OR
PLC
USE
DIAGNOSTICS
MENU
TO
FORCE
CHANNEL
2
OUTPUT
TO
4MA
/
20MA
AND
VERIFY
READING
ON
RECEIVING
DEVICE
GDS
‐
68XP
COMPLETES
FIRST
SEQUENCE
AND
ENTERS
PURGE
/
HOLD
MODE:
OUTPUT
=
“FLOW
FAULT”,
L2
(GREEN)
FLASHING
7
OPEN
SAMPLE
INLET
VALVE
VERIFY
PRESSURE
ON
PRESSURE
GAUGE
8
PRESS
“BYPASS”
AND
ADJUST
REGULATOR
FOR
0.5
LPM
SAMPLE
GAS
FLOW
DO
NOT
RE
‐
ADJUST
FLOW
METER
VALVE
RAW
SENSOR
OUTPUT
SHOULD
INCREASE
IF
TARGET
GAS
PRESENT
9
PRESS
“RUN”
TO
EXIT
BYPASS
CLOSES
SAMPLE
VALVE
AND
RETURNS
SEQUENCER
TO
PURGE/HOLD
MODE
GDS
‐
68XP
COMPLETES
PURGE
/
HOLD
GDS
‐
68XP
WILL
RUN
NEW
SAMPLE
SEQUENCES
APPROXIMATELY
EVERY
FOUR
HOURS
ALLOW
NEW
UNIT
TO
RUN
SEVERAL
SEQUENCES
BEFORE
PROCEEDING
10
PERFORM
SENSOR
CALIBRATION
SEE
CHAPTER
7
GDS
‐
68XP
INSTALLATION
COMPLETE