Figure 2
(a) batch phase - the baseline
voltage corresponds to a methanol free signal followed by
an on-line calibration.
(b) discrete 0.1% doses of
methanol up to 0.5% resulting in the initial induction phase
- methanol was then allowed to be consumed to the user defined
set point of 2.6 volts which responds to 0.3% methanol from
on-line calibration at 1800 secs.
(c) the methanol pump was set
to deliver 0.6 mls/min and allowed to resume in stand alone
control mode at 2800 secs
(d) the base line voltage was
rapidly verified utilizing the bypass option and returned
to standalone contorl at 0.3%
(e) returned to stand alone
control at 0.3% stand alone control at 0.3% at 4000 secs
(f) the set point was changed
to 0% methanol as derived from the on-line calibration in
order to evaluate the recovery time
(g) at 4500 secs, the setpoint
was readjusted to 0.3% and maintained throughout the remaining
fermentation.
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