▪ SYSTEM PROGRAM 1 TC defines the system parameters for
Oxidation Phase operation in TC analysis mode. In TC analysis
mode, the TC content of a sample is measured by means of a
single sample injection into a single reactor.
▪ When the Analysis Type is changed to TC, the System Program
1 menu is automatically updated with the corresponding TC
system parameters. The TC system parameters, which are not
covered in SYSTEM PROGRAM 1 TIC + TOC above are as
follows:
▪ PRE OXIDATION defines the time (45s by default) and oxygen
flow (10 l/h) settings for the initial oxidation stage, where
hydroxyl radicals are generated for the VOC Oxidation phase.
▪ VOC OXIDATION states the time (45s) and oxygen flow (0 l/h no
flow by default) settings for the VOC Oxidation stage, where the
volatile organic carbon element of the sample is oxidized.
▪ The objective of no oxygen flow at this reaction phase is to
prevent the loss of any volatiles before they are oxidized.
▪ BioTector sparges and measures the TC content of the sample
for the TC SPARGE TIME (90s by default) with the oxygen flow
(20 l/h) settings.
▪ If the TC level does not drop below the TC CHECK level (25ppm
CO
2
by default in Reaction Check menu) at the end of TC
OXIDATION time, BioTector automatically extends this time
(extension time) until the TC level drops below 25ppm level.
▪ A “91_TC OVERFLOW” warning is generated if the TC level
does not drop below 25ppm at the end of the maximum
extension time, which is 300 seconds. The maximum extension
time is not a programmable function. It is a fixed figure within the
system software.
▪ TC ACID states the amount of acid (in pulses) to be injected into
the reactor for the TC SPARGE phase in TC mode at range 1.
▪ TC OXIDATION determines the time (75s by default), the ozone
generator will be running at the start of the TC Sparge phase.
Note that TC OXIDATION time is part of the TC Sparge phase
and does not increase the TC SPARGE TIME.
▪ SYSTEM PROGRAM 1 VOC defines the system parameters for
Oxidation Phase operation in VOC analysis mode. In VOC
analysis mode, two reactions (first one in TC mode and the
second one in TIC & TOC mode) are run consecutively by
means of two sample injections into a single reactor.
▪ When the Analysis Type is changed to VOC, the System
Program 1 menu is automatically updated with the
corresponding VOC system parameters. The VOC system
parameters, which are not covered in SYSTEM PROGRAM 1
TIC + TOC and TC analysis modes above is as follows:
▪ SAMPLE PUMP FORWARD 2 specifies the Sample Pump’s
forward operation time (3s by default), where the Sample Pump
runs forward to fill the sample line with sample liquid, prior to the
second sample injection into the reactor for the second TIC &
TOC analysis reaction in VOC systems.
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