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This can take place when measurement The software enables planning of various
values are exceeded or can be applied automatic maintenance and calibration tasks.
permanently. In this case, the user specifies This way, automatic calibration of the
the desired dilution factor in the selected measuring method was programmed to take
method. place every 48 hours and automatic
regeneration of the catalyst twice a week.
■ Kit for high-salt samples Sampling took place in the counterflow mode
For the continuous TOC determination of with backflushing in order to prevent clogging.
samples with high salt loads (> 10 g/L),
Shimadzu has developed a salt kit. The ■ Results of the practice test
combustion tube has a special shape and As described in the test, a sample was
uses two different catalyst beads. This collected every 4 minutes over a period of
combination prevents crystallization that can three months, and subsequently diluted,
lead to clogging of the system. acidified and analyzed. After three months a
total of approximately 27,000 measurements
■ TOC-4200 in daily practice was achieved. . Within this period, the
To verify the robustness and the reliability of instrument was automatically calibrated 45
the TOC-4200 during practical operation, the times and the catalyst was regenerated
analyzer has been subjected to an endurance nearly 25 times. These functions can be
test in a German chemical park. For three easily programmed via a calendar on the
months, the TOC-4200 had to stand the test touch screen. The calibration function
under the most difficult conditions at one gradients remained stable over the entire
measuring station. The wastewater under time period.
investigation was alkaline (pH ≥ 12) and
highly saline (conductivity 4 ≥ mS/cm).
Fig. Diagram of 27.000 Measurement results (three
months)
The test did not require any catalyst
exchange or a single maintenance operation.
There was also no instrument or software
failure or any other component failure. In
short: the TOC-4200 has successfully passed
the endurance test.
Fig. TOC-4200 on site ■ Recommended analyzer / Configuration
TOC-4200
This is why the instrument was equipped with Kit for high-salt samples
a kit for salt-containing samples. In addition,
the automatic dilution function was used to
dilute the samples (including the matrix).
