VALVE ACTIVATION determines the two possible times for the
multi-stream valve to change over for the next stream. If the
default SPF (SAMPLE PUMP FORWARD) option is selected,
the valve for the next stream is selected as the Sample Pump
starts to run forward to bring sample from the next stream. If
SPR (SAMPLE PUMP REVERSE) option is selected, the valve
for the next stream is selected when the Sample Pump reverse
operation is completed for the current stream, or when the
BioTector powers up.
If SAMPLER is activated in Stream Program menu, SPF option
is displayed as SPF/SAMPLER.
Due to the organic and inorganic contamination in the BioTector
reagents, every TOC reaction will generate a small level of CO
2
from the reagents alone even if there is no sample present. The
first setting (100ppm by default) of CO2 LEVEL specifies the
reaction check CO
2
level, which is the minimum expected CO
2
reading in ppm measured by the CO
2
Analyzer in a reaction.
The second setting (AUTO by default) of CO2 LEVEL defines
the reaction check CO
2
level mode. When programmed as
AUTO, BioTector automatically sets the CO2 LEVEL to 60% of
the average CO
2
peak reading recorded during the Zero
Calibration or Zero Check reactions. If it is set as MAN (Manual),
system uses the fixed programmed CO2 LEVEL value.
BioTector looks for first an increase and then a decrease in the
CO
2
peak data during the TOC (or depending on ANALYSIS
TYPE, TC) phase. If the CO
2
peak occur at the wrong phase of
the reaction and/or if the CO
2
peak is smaller than the expected
CO2 LEVEL (100ppm by default) for the number of consecutive
reactions defined by REACTION COUNT below (3 reactions by
default), system generates a “04_NO REACTION” warning or a
“04_NO REACTION” fault (depending on the FAULT TYPE
setting below) and logs into the fault archive.
When CO2 LEVEL is programmed as 0ppm, the reaction check
function will be disabled. Reaction check function is omitted
during the zero calibration or zero check reactions.
FAULT TYPE determines the type (WARNING or FAULT) of the
“04_NO REACTION” fault.
When “04_NO REACTION” fault occurs, if FAULT TYPE is
programmed as WARNING (by default), BioTector keeps
running. If it is programmed as FAULT, BioTector stops.