Hach BioTector B3500s, User Manual

Page: 101 / 166

Page 101
VOC CYCLE 1 ▪
VOC CYCLE determines the frequency of the TC analysis cycles
and the TC TIC & NPOC analysis cycles BioTector carries out
depending on the TC CHECK STREAM 1-3 concentration
settings below. In other words, the TIC & NPOC analysis is
carried out on a scheduled basis depending on the programmed
TC CHECK STREAM 1-3 concentration levels.
▪ When the VOC CYCLE setting is 1, BioTector carries out TC TIC
& NPOC analysis continuously. When the VOC CYCLE setting is
for instance 10, BioTector carries out one TC TIC & NPOC
analysis followed by nine TC analyses.
▪ If any of the measured TC result is outside the TC CHECK
STREAM 1-3 concentration levels programmed in both % and
mgC/l below, BioTector starts to carry out TC TIC & NPOC
analysis as soon as the current stream program analysis
sequence is complete.
▪ VOC CYCLE and TC CHECK STREAM 1-3 functions are
displayed in systems operating with the VOC analysis mode.
TC CHECK STM 1 10% 5.000mgC/l
TC CHECK STM 2 10% 5.000mgC/l
TC CHECK STM 3 10% 5.000mgC/l ▪ When the VOC CYCLE described above is programmed to take
place at a frequency greater than 1, BioTector starts to carry out
TC TIC & NPOC analysis cycle for the relevant stream, if the TC
result is outside the programmed % and mgC/l bands. If the TC
result is within the programmed bands, the BioTector returns to
the routine TC analysis as scheduled.
▪
The BioTector operation with the programmable VOC CYCLE,
and the ability of the system to automatically carry out TC TIC &
NPOC analysis at a variable frequency, based on the
programmable TC CHECK STREAM 1-3 concentration bands,
allows the measurement of multiple parameters of the sample
without a significant impact on the overall analysis cycle time.
STREAM 1 , 2 RANGE 3
STREAM 2 , 1 RANGE 3
STREAM 3 , 4 RANGE 3
STREAM - , - RANGE -
……………… …………… …………… …
▪
If the CONTROL is programmed as BIOTECTOR, the multi-
stream valve sequence operates according to the STREAM and
RANGE settings defined in this menu.
▪ In STREAM 1 , 2 setting, the first setting “1” represents the multi -
stream valve number (e.g. Stream Valve 1), and the second
setting “2” represents the number of reactions to be carried out
at this stream before switching to the next stream.
▪ RANGE defines the operation range for each stream. In a multi-
stream system, the ranges are locked to Range 3 by default in
the factory. It is recommended to lock each stream to a
particular range (e.g. 1, 2 or 3), which is appropriate to the
concentration levels of the sample, in multi-stream systems.
▪ When a specific stream is programmed as “ - , - - -, RANGE - “,
the analysis on that stream does not take place.
▪
The AUTO (AUTOMATIC) range change function is disabled in
multi-stream systems by default. If it is necessary to run any of
the streams with AUTO range change function, please contact
your local distributor or the manufacturer. When AUTO range
change function is used, a minimum of five analysis reactions is
recommended as BioTector needs to find the optimum operation
range automatically. Therefore, depending on the system
response, it may be necessary to discard the first two or three
analysis results, when the AUTO range change function is
selected for a specific stream.