Hach BioTector B7000i - Page 114

Page 114
TOC ACID 7p
 TOC ACID states the amount of acid (in pulses) to be injected
into the reactor for the TOC SPARGE phase at range 1.
TOC SPARGE TIME 135s 20l/h
 BioTector sparges and measures the TOC content of the sample
for the TOC SPARGE TIME (135s by default) with the oxygen
flow (20 l/h) settings.
 If the TOC level does not drop below the TOC CHECK level
(350ppm CO2 by default in Reaction Check menu) at the end of
TOC OXIDATION TIME, BioTector automatically extends this
time (extension time) until the TOC level drops below 350ppm
level.
 A “51_TOC OVERFLOW” warning is generated if the TOC level
does not drop below 350ppm 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.
TOC OXIDATION 60s
 TOC OXIDATION determines the time (60s by default), the
ozone generator will be running at the start of the TOC Sparge
phase. Note that TOC OXIDATION time is part of the TOC
Sparge phase and does not increase the TOC SPARGE TIME.
REACTOR PURGE 47s
 REACTOR PURGE displays the overall time, which is 47s by
default, the BioTector purges the Mixer Reactor.
 During the REACTOR PURGE phase, system continuously
monitors the oxygen gas flow using the mass flow controller
(MFC). If any gas leak or any flow problem is detected during
this phase, BioTector generates a “06_PRESSURE CHCK FAIL”
or a “02_LOW O2 FLOW - SO” fault and stops. These faults are
logged into the fault archive.
PRESSURE CHECK 20s, 40 l/h
 PRESSURE CHECK defines the time and oxygen gas flow (20
second at 40 l/h by default) the Mixer Reactor is pressurized for
the REACTOR PURGE phase above.
PRESSURE RELEASE 12s, 45 l/h
 When the gas flow is equal to or less than the PRESSURE
CHECK FAULT level, which is 6.0 l/h defined in Sequence
Program, Pressure/Flow Test Program menu, for longer than 1
second during the PRESSURE CHECK phase above, BioTector
opens the Sample Out Valve (MV5) and releases the pressure of
the reactor for 12 seconds at 45 l/h oxygen flow by default using
the PRESSURE RELEASE function. With this process, the
majority of the liquid present in the Mixer Reactor is discharged
into drain through the Sample Out port.
PRESSURE PURGE 7s, 60 l/h
 When PRESSURE RELEASE phase above is completed, using
the PRESSURE PURGE function, the Mixer Reactor is
pressurized once again for 7 seconds at an oxygen flow of 60 l/h
by default.
PRESSURE RELEASE 8s, 20 l/h
 When the PRESSURE PURGE phase above is completed,
BioTector opens the Sample Out Valve (MV5) and releases the
pressure of the reactor for 8 seconds at 20 l/h oxygen flow by
default using the PRESSURE RELEASE function.
 Unlike the first PRESSURE RELEASE phase described above,
the motor of the Mixer Reactor is activated during this phase.
With this process, any remaining liquid present in the Mixer
Reactor is discharged into drain through the Sample Out port.
CYCLES 1
 CYCLES (1 by default) defines the number of times the
PRESSURE PURGE and the PRESSURE RELEASE phases
take place during the REACTOR PURGE phase.
ANALYZER PURGE 15s 40l/h
 BioTector purges the CO
2
analyzer for the ANALYZER PURGE
time (15s by default) with the default 40 l/h oxygen flow. System
fan is always kept activated during this phase.
REACTION TIME 6m52s
 REACTION TIME displays the total reaction time (in minutes and
seconds) for range 1, based on all programmed settings above.