4-20Ma Program - Hach BioTector B7000 User Manual

4-20mA Program

OUTPUT MODE
CHANNEL 1
CHANNEL 1
CHANNEL 2
CHANNEL 2
...........................
CHANNEL 7
CHANNEL 7
SIGNAL FAULT
FAULT LEVEL
DIRECT
STREAM 1 TOC
250mgC/l INST
STREAM 1 TN
100mgN/l INST
........................ ......
--- TIC
200mgC/l AVRG
YES
1.0mA
 OUTPUT MODE specifies the 4-20mA outputs operation. This
parameter is programmed as: DIRECT (direct mode by default),
STREAM MUX (stream multiplex mode) or FULL MUX (full
multiplex mode).
 In DIRECT mode, each 4-20mA output channel is dedicated to a
specific stream and result type. In STREAM MUX and FULL
MUX modes, specific channels are dedicated to periodically
change their value in steps to indicate the stream number and
result type. This periodic operation reduces the number of
required 4-20mA channels significantly.
 See Section 13, Appendix 3 for the operation details and the
complete protocols of the STREAM MUX and the FULL MUX
modes.
 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, COD, BOD or TN. In TIC &
TOC analysis mode, TC is the sum of TIC and TOC.
 Calibration outputs are updated when the system completes the
programmed number of calibration reactions.
 In CHANNEL 1 250mgC/l INST setting, the first parameter (e.g.
250mgC/l) is the full scale of the channel. The second parameter
could be programmed as INST (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 OXIDATION ANALYSIS 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.
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