20
816#
6HUYLFH
5.3.1
Monitor
From the Service Menu option 5, "Monitor", if selected will present three options; 1-Pump Sample,
2-Pump Antiseptic and 3-External Chamber.
Pump Sample
Selecting this option allows the user to prime the sample line.
Pump Antiseptic
This option is used to prime the antiseptic solution.
External Chamber
This option is used to align the external chamber with the sipper needle. When this option is selected, the
sipper will swing out of the 2700 and stop above the external sample chamber. Option 2-Down will allow
the sipper needle to be lowered to test external chamber alignment.
5.3.2
Analog /Control
From the Service Menu option 6. "Analog I/O" if selected will present two options; 1-Analog outputs and
2-Discrete I/O.
Analog Outputs
Selecting this option will allow the user to drive both DAC outputs to full scale (+5 or +10 volts) or to zero
volts with a key press.
Discrete I/O
This option allows the user to toggle the state of each logic output between 0 and +5 volts.
91#
3,'
#
&RQWURO
The control algorithm incorporated into the 2730 software is a variant of the Proportional-Integral-
Derivative (PID) algorithm used in many process controllers today. Because of the many factors which
can affect control it is difficult, if not impossible, to accommodate all circumstances in a single form of the
PID control algorithm. The 2730 control algorithm is no exception. Certain assumptions apply to the
application of this control scheme of which the user should be aware. Deviations from these assumed
conditions will result in degraded regulation.
6.1.1
Assumptions
1.
Regulation is begun (enabled) when the analyte concentration is within
±
10% of the set point.
2.
The sampling interval is regular. That is, the period between samples (corrections) is constant.
Random calibration timing will degrade regulation performance if it affects sample timing.
3.
Higher rates-of-change of the analyte are coupled with shorter sampling intervals to the maximum
extent possible.
4.
Maximum control pump on-time is kept less than the sampling interval.
A discrete sample performed at a sample station different than
the monitor station will not initiate regulation or affect analog
output.
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