Chapter:
Topic:
PURGE-ANn-TRAP
Connecting The On-Line Liquid Sampler To
An
ExistingSRI P-&-T (con' t.)
4. Once the on-line sampling accessory hardware
has
been connected
to
the SRI purge-and-trap
sampling system, edit the purge-and-trap timed event table in order
to
control the on-line sampler as
an integral
part
of the purge-and-trap system. The event table
used
should
be
similar
to
the timed
event table that follows, making note that events H and D specifically control the liquid sampling
valve retation and the sparge head
drain
valve, respectively.
Once
the event table
has
been input and
saved, the system
is
ready for operation.
TIMED EVENT TABLE FORON-LINE LIQUID SAMPLING ACCESSORY
TIME
EVENT
0.100
EOn
0.200
HOn
4.500
DOn
5.100
EOff
5.300
DOff
5.400
HOff
6.000
c On
6.100
FOn
8.000
GOn
12.000
EOn
13.000
GOff
13.100
BOn
14.900
FOff
15.050
EOff
15.100
COff
15.200
BOff
DESCRIPTION
Sparge
Gas
Activation
(Gas
On)
Rotate Liquid Sampling Valve To INIECT Position
Sparge Head
Drain
Valve Open To
Drain
Sparge
Gas
Activation
(Gas
Of!)
Sparge Head
Drain
Valve Closed
Rotate Liquid Sampling Valve To LOADPosition
Heat Trap
If2
Heat Trap #1
Rotate Purge-and-Trap Sampling ValveTo INJECT Position
Sparge
Gas
Activation
(Gas
On)
Rotate Purge-and-Trap Sampling ValveTo LOAD Position
Add 50 Degrees ToTrap Temperature Setpoint (For Balteout)
Heat Trap #1(Heat Of!)
Sparge
Gas
Activation (Gas Of!)
Heat Trap
If2
(Heat Of!)
Add 50 Degrees To Trap Temperature Setpoint (Back To Normal)
SIMPLIFIED PROCESSION OFOPERATION - ON-LINE UQUID SAMPLING ACCESSORY
1
At 0.2
minutes.
the
sparge
gas
forces
liquid sample
frcm
the
sample
loop
in
the
<l&"liDe
liquid
sampling accessory
into
the
sparging
bead
for
analysis.
2
Through
4.5
miDmes.
the
sparge
gas ""'"'
throuab
the
meuured
volume
of
liquid
in
the
spugiDa
beod,
ODd
the
spa,..
gas
passes
10
the
~
cooceatl
ator.
3
At
4.5
minutes.
the
spa,..
gas
forces the
liqWdiDthe
sparging
head
c;U
of
the
vessel
as
the
dnin
soJeuo;d
voJvo
opeas,
.nowiDg
the
sample
to
be
drained
oomplotely.
