ISCO 6700SR, Instruction Manual, Page: 63 / 190

6700SR Refrigerated Sampler
45
Sampling cycles vary somewhat according to program settings for
distribution. The sampler can move the distributor arm clockwise
and counterclockwise, making a number of distribution methods
possible. (In this manual, the words “sample event” refer to a full
sampling cycle for any distribution.)
Other variations include extended-program settings for suction
line rinses and sampling retries. A sampler running a program
with line rinses completes the presample purge and then rinses the
line. The suction line is purged after each rinse. When programmed
for sampling retries, the sampler will attempt to pump a sample
again if it fails on previous attempts.
Measuring Sample Volume
“Sample volume” refers to the amount of liquid delivered into a bot-
tle. The volume is determined by the programmed value. The vol-
ume is dependent on the volume per revolution of the pump, which
is dependent on the suction head. The 6700SR delivers the sample
by counting the pump revolutions and automatically compensating
for the suction head.
Figure 6 Identifying the Sampler Components
a. Controller
b. Refrigerator
c. Peristaltic pump
d. Liquid Detector
e. Strainer
f. Suction line
g. Coupling
h. A pump tube routed from the liquid
detector’s intake port through the
pump, out the detector’s discharge
port and over the side of the control-
ler to a bulkhead fitting at the top of
the refrigerator.
i. Bulkhead fitting
j. Discharge tube running from the
bulkhead fitting on the inside of the
refrigerator through the spring and
distributor arm
k. Distributor arm and spring
k
e
j
i
a
c
d
h
g
f
b