Hach BioTector B3500e, User Manual

Page: 104 / 163

Page 104
8.2.9 Alarm Program
ALARM 1 TOC STREAM 1
20.0mgC/l
ALARM 2 TIC STREAM 2
10.0mgC/l
ALARM 3 COD STREAM 1
70.0mgO/l

If ALARM 1-3 is not programmed in Output Devices menu, this
option will not be available in this menu.

ALARM 1-3 operates on a specific stream and reaction result
type. In “ALARM 1 TOC STREAM 1” setting, TOC is the desired
reaction result, which can also be programmed as COD, BOD,
TIC, TC or VOC. STREAM 1 is the selected stream.

In ALARM 1 20.0mgC/l setting, 20mgC/l defines the desired
alarm activation level. The concentration level determines the
alarm condition where the Alarm Relay is set or reset at the end
of each reaction once the calibrated result is known.
CO2 ALARM 1 50.0ppm
CO2 ALARM 2 100.0ppm
CO2 ALARM 3 150.0ppm

If CO2 ALARM 1-3 is not programmed in Output Devices menu,
this option will not be available in this menu.

CO2 ALARM 1-3 is a predictor function of a possible high
TOC/TC (COD or BOD if programmed) level for a specific
stream. By default, this function is disabled by 0.0ppm setting. If
programmed, it provides an earlier warning of an unusually high
TOC result from the rising slope of the CO
2
peak generated
during the reaction.

If programmed, the alarm level (ppm CO
2
peak) need to be
selected carefully considering the temperature effect, which
could be significant on the CO
2
peaks. In other words, enough
margins needs to be given for the settings which will create an
actual early warning for an unusually high reading. At the end of
the reaction, the CO2 Alarm Relay status is maintained or reset
depending on the reading. In addition, this function is only
suitable for multi-stream systems operating on fixed ranges, or
systems operating on a single range. The use of this function is
not recommended for systems which uses automatic range
change.

Note that in TIC & TOC and VOC analysis types, the CO
2
peak
used for the CO2 ALARM 1-3 is the TOC CO
2
peak. In TC and
TC – TIC analysis type, the CO
2
peak used is the TC CO
2
peak.
--> PROGRAMMABLE OUTPUTS

Programmable Outputs is a link to Output Devices,
Programmable Outputs menu.