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CHANNEL 1
CHANNEL 1
CHANNEL 2
CHANNEL 2
CHANNEL 3
CHANNEL 3
CHANNEL 4
CHANNEL 4
SIGNAL FAULT
FAULT LEVEL
OUTPUT < 4mA
EXCLUDE RESULTS
STREAM 1
TOC
25mgC/l
INST
STREAM 1
TIC
100mgC/l
INST
STREAM 2
DW%
100%
INST
---
TIC
100mgC/l
AVRG
YES
1.0mA
0%
3
▪ In CHANNEL 1 STREAM 1 TOC setting, the first parameter
defines the type of 4-20mA output which can be programmed as:
STREAM and MANUAL reaction results, CAL (zero & span
calibration results), CAL Z (zero results) and CAL S (span
results). The second parameter is the data type which can be
programmed as TOC, TIC, TC, VOC, BOD, COD and DW%.
See Section
8.2.4
TIC & TOC analysis mode, TC is the sum of TIC and TOC.
▪ In CHANNEL 1
25mgC/l
parameter (e.g. 25mgC/l) is the full scale of the channel. The
second
parameter
could
(Instantaneous) or AVRG (Average).
▪ If INST is selected, the result for the selected stream is updated
at the end of each reaction. If AVRG is selected, the average
result of the 24 hour reactions is updated for the specific stream
at the AVERAGE UPDATE time programmed in Sequence
Program, Average Program menu.
▪ When DW% (Drinking Water % REMOVAL) data type is
selected, system automatically defaults to STREAM 2 (OUTLET
STREAM) and the full scale of the channel is fixed to 100%. See
Section
8.2.4 COD/BOD/DW Program
▪ When ANALYSIS TYPE is changed in Analysis Mode menu,
modifications on the 4-20mA result type and the channel full
scale may be required.
▪ When SIGNAL FAULT is activated (YES) by default, if a fault
occurs, system sends the FAULT LEVEL signal below for all 4-
20mA channels. When it is set to (NO), 4-20mA outputs do not
signal FAULT LEVEL if a fault occurs and system keeps sending
live data on the outputs.
▪ FAULT (1.0mA by default) specifies the fault output level for all
system 4-20mA channels.
▪ OUTPUT < 4mA function defines the factor (0% by default) to be
applied on the stream value if the output value becomes smaller
than 4mA (negative result). This function allows the user to
clamp or reduce the effect of negative result on the 4-20mA
output value.
▪ For instance, if the OUTPUT value is set as 100%, 100% of the
negative result is sent as 4-20mA signal. If the setting is 50%,
50% of the negative results is sent as 4-20mA signal. When the
setting is 0%, no negative result is send and any negative result
is clamped to 4mA (0mgC/l) level.
▪ When OUTPUT MODE is programmed as BASIC above,
EXCLUDE RESULTS defines the number of stream analysis
reactions (3 by default) to be omitted after the zero and/or span
calibration/check reactions. This is achieved by keeping the
calibration output relay activated until the programmed number
of stream analysis is completed. In other words, the calibration
contact remains active for a programmable number of online
reactions after the completion of the calibration cycle. This
function helps to ignore any possible calibration impact on the
system response.
COD/BOD/DW Program
for details. In
INST
setting,
be
programmed
for details.
the
first
as
INST
Page 106
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