6100CR Refrigerated Sampler - Isco
6100CR Refrigerated Sampler - Isco
6100CR Refrigerated Sampler - Isco
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<strong>6100CR</strong> <strong>Refrigerated</strong> <strong>Sampler</strong><br />
Section 2 Programming<br />
After the 50 second interval has passed, the flow valve will<br />
shut off and the following display will appear:<br />
REPEAT CALIBRATION<br />
YES<br />
NO<br />
Followed by (if Yes is selected):<br />
PUT DISCHARGE TUBE<br />
IN GRAD CYLINDER<br />
Before repeating the calibration, measure the flow volume<br />
you have collected in the graduated cylinder. The collected<br />
volume should be between 90 and 110 ml. If it is low,<br />
increase the flow slightly by turning the handle on the<br />
pressure regulator clockwise. If the collected volume is<br />
high, turn the regulator handle counter-clockwise slightly<br />
to decrease the flow.<br />
Select “YES” for the repeat calibration until the collected<br />
volume is between 90 and 110 ml. Then select “NO” to continue<br />
the Setup sequence. Once calibration is successfully<br />
completed, lock the regulator adjustment knob in place by<br />
holding the knob still in your hand and tightening the locking<br />
ring against the bottom of the knob. If a considerable<br />
number of calibration routines have to be run to achieve<br />
proper calibration, the precooler will warm up and not provide<br />
the usual amount of cooling if the first sample is taken<br />
immediately.<br />
3. If you select NO for CALIBRATE FLOW RATE, the following<br />
will appear:<br />
STRAINER PURGE TIME<br />
(XX) SECONDS (0-600)<br />
The value entered for purge time is dependent on several<br />
factors. First is the amount of carryover from sample to<br />
sample that is acceptable. Second is the amount of time<br />
that can be allocated to purging. Third is the length of the<br />
sample line. Tests have indicated that a minimum of seven<br />
volumes are needed to reduce the carryover in the strainer<br />
to 1%. Based on the volume of the strainer, Teledyne <strong>Isco</strong><br />
recommends a setting of from 875 - 1250 ml to purge the<br />
strainer and 60 ml per 25 feet of line from the source to the<br />
sampler.<br />
The flow rate through the strainer “bypass” is somewhat<br />
variable, ranging from 400-500 ml/minute. It can be<br />
checked by pressing Manual Purge in the Standby state<br />
and then selecting “Strainer Purge” and measuring the<br />
amount of liquid collected.<br />
2-4