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Isco 4700 Refrigerated Sampler
Section 3 Programming
RESET PUMP COUNTER?
YES
__00000 PUMP COUNTS
TO WARNING
3.3.10 Program Lock
SELECT OPTION: (<-->)
PROGRAM LOCK
3-8
3. If you have replaced the pump tube, use the Next and Pre-
vious buttons to select YES, then press Enter. Otherwise,
NO
select NO.
4. Enter an interval using the Number buttons and press
Enter. (The default value is "5.")
The sampler counts pump revolutions in both the forward and
reverse cycles with a resettable counter. When the counter
reaches the default of 500,000 counts, the sampler displays an
alert message, "WARNING! CHANGE PUMP TUBE." After
replacing the pump tube (see section 5.1.2), reset the count to
zero so the sampler can begin tallying the pump counts for the
new tube.
Note
Opening the pump housing and replacing the pump tube will
not reset the counter.
The default count of 500,000 represents the average interval at
which the pump tube should be inspected. Because liquid prop-
erties and site conditions affect the life of the pump tube, you can
change this interval to better suit your application. If a pump
tube inspection (section 5.1.1) at 500,000 counts reveals little or
no wear, this value can be increased to avoid needless replace-
ments. Conversely, if an inspection reveals significant wear at
500,000 counts, this value should be reduced to prevent a pump
tube failure. Pump tubes wear out sooner when the sampled
liquid contains a high percentage of suspended or abrasive solids.
Pump tubes typically last 1,000,000 counts when pumping rela-
tively clean liquids at normal temperatures.
Note
The importance of regular tubing replacement cannot be over-
stated. The key is to replace the tube before failure, not after.
When a pump tube ruptures, grit and other abrasive debris can
enter the pump housing. Over time, this abrasive material may
degrade the sample collection performance.
Failure to maintain the pump tube may result in permanent
damage to the sampler. Check the condition of the pump tube
regularly and if the tube shows signs of fatigue or wear,
replace it immediately. A properly maintained sampler will pro-
vide years of reliable service that is expected of a Teledyne
Isco Sampler.
Select this option to turn the Program Lock feature on or off, and
to change the password. When this security feature is enabled,
the sampler requires a numeric password before a user can con-
figure, program, calibrate, run a program, or grab a sample.
1. Select the PROGRAM LOCK option and press Enter.
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