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Part III: 1-11
Oil in Water Part III
Teledyne Analytical Instruments
The Display PCB: This board holds the VFD display and the LED
display, and carries the signals to and from the Operator switches on the door
of the 6600.
The Main PCB: This board is mainly digital. The micro controller,
EPROM, RAM, and RS232 driver, as well as digital drivers for alarms, and
valves are located here. There is an analog section where the ADC, DAC,
0-1 VDC output and 4-20 mA modules are located.
3.3 Electrical Connections
There are no electrical junction boxes in the system; power, signal, failure
alarm, and distribution connections are made to terminal blocks located inside
the control/analysis unit housing. Refer to the Interconnection and Wiring
Diagrams at the rear of the manual for details, and chapter of part 1 of this
manual.
3.4 The Sampling System
3.4.1 Sample Water Preconditioning System
The sample water preconditioning system prepares the sample for analysis
on a continuous basis. The sample is homogenized (when range is above
20ppm Oil) so that any undissolved oil fraction will be uniformly dispersed into
solution along with the dissolved oil fraction of the sample prior to presentation
for analysis. Sample pressures ranging up to 150 psi can be accommodated. The
control manifold has a utility water connection selected by a 3-way valve and
inlet port, so that the sample line can be periodically flushed to clear it of
accumulated debris. The untreated sample flows to a high-shear homogenizer
whose purpose is to break up undissolved oil fractions in the sample into droplets
so small that they literally appear to be in solution. This conversion permits the
energy generated at the 254nm measuring wavelength to be absorbed by oil that
would otherwise appear opaque when presented for analysis.
Output of the homogenizer is delivered under a controlled flow for proper
homogenization of the sample water. The homogenized sample is delivered to
the analysis sample cell or through the cell from the auto-zero filter assembly(s).
During the Sample Analysis Cycle, all solenoid valves are de-energized.
SV3 is N.O. and permits the sample to be delivered to the sample cell.