Cod/Bod Program - Hach BioTector B7000 User Manual

STREAM 1 , 2
STREAM 2 , 1
STREAM 3 , 4
STREAM - , -
.................. ...............

COD/BOD Program

DISPLAY
STREAM 1
TOC FACTOR
TN FACTOR
NO3 ESTIMATE
STREAM 2
TOC FACTOR
TN FACTOR
NO3 ESTIMATE
STREAM 3
........................
STREAM 6
........................
RANGE 3  If the CONTROL is programmed as BIOTECTOR, the multi-
RANGE 3
stream valve sequence operates according to the STREAM and
RANGE 3
RANGE settings defined in this menu.
RANGE -
 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) 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.
----  DISPLAY function (--- not programmed by default) allows the
user to program (COD and/or BOD) the system to display and
send the relevant 4-20mA signals for COD and/or BOD (mgO/l)
if required.
 In Stream 1 1.0 0.0 setting , the first setting "1.0" acts as the
1.0 0.0
1.0
"OVERALL FACTOR" and the second setting acts as the
1.0
"OFFSET FACTOR" in the following equation:
0.0mgN/l
 COD (or BOD) = Overall Factor * { (TOC Factor * TOC) + [TN
Factor * (TN – NO
1.0 0.0
 In TC analysis mode, instead of the TOC FACTOR, the TC
1.0
FACTOR is displayed in this menu and used in above equation.
1.0
0.0mgN/l
 If the DISPLAY is programmed as COD and/or BOD above, the
system multiplies the TOC result of the corresponding stream
1.0 0.0
(STREAM 1-6) with the TOC FACTOR, if programmed subtracts
......... ......
the NO
1.0 0.0
result with the TN FACTOR, add these values and multiplies the
......... ......
result with the OVERALL FACTOR and finally adds the OFFSET
FACTOR to calculate the corresponding stream's COD and/or
BOD value.
 The STREAM FACTOR for each stream is obtained following
the procedures described in information sheet "I030. TOC to
COD or BOD Correlation Method".
 Stream 1 factors are used for manual samples and calibration
standards. If NO
system automatically ignores TN result contribution to COD
and/or BOD value.
Estimate)] } + Offset Factor
3
estimate value from the TN result and multiplies the
3
estimate value is greater than the TN result,
3
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