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1. (WO1979000998) IN-LINE PH AND PION CONTROLLER
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WHAT IS CLAIMED:
1. A method of controlling ionic characteristics in a flow line having a stream flowing therein
comprising the steps of distributing a pattern of
ionic sensors over the cross-sectional area of the
flow line to generate individual sensor signals in
response to the ionic characteristics detected by each
of the sensors, converting each of the signals to its
antilogarithms , averaging all the antilogarithms, converting the average antilogarithm to a binary control
word, providing reagent orifices downstream of the
sensors in a pattern distributed across the cross
• section of the flow stream, controlling the release
of the reagent to the orifices from individual reagent dispensers in accordance with the binary control word,
5 and mixing the flow stream downstream of the reagent
orifices to homogenize it .
2. A method as set forth in claim 1, wherein the step of mixing flow stream is performed upstream
of the sensors in a backmixing passive manner.
0 3. A method as set forth in claim 2, wherein the step of mixing the flow stream downstream of the
reagent orifices is performed in a static manner.
4.- A method as set forth in claim 1, wherein the recited set of steps are followed by a second set
5 of steps substantially identical to the recited set
to cascade the control function.
5. A method as set forth in claim 4, wherein the signals derived from the second set of sensors are fed back into the first set to optimize the control.
0 6. A method as set forth in claim 4, wherein a final set of distributed sensors are disposed in the flow stream after the second set of sensors and reagent orifices and the signal from the final set of sensors
is used to correct the signals from upstream sensors
5 to finely adjust the control word to the ionic char*
acteristics of the flow stream.

'BU A U
O PI

7. A method as set forth in claim 1 , wherein liquid derived from the flow stream is utilized to
carry the output of the reagent dispensers to the re- '5 agent orifices.
8. A method as set forth in claim 1, wherein a multitude of parallel arranged reagent dispensers are individually operated either full on or full off to
effect definable reagent addition.
10 9. A method as set forth in claim 1 , wherein the reagent dispensers have capacities and are operated to dispense multiples of each other to facilitate
addition of predetermined amounts of reagents to the
flow stream.
15 10. An apparatus for controlling the ionic characteristics of a stream of liquid flowing in a
line comprising an array of ionic sensors distributed across the cross section of the line, each of the
sensors being connected to an individual antilogging

20 means, the antilogging means being connected to a digitizing means, the array of digitizing means being
connected to an averaging means , the averaging means being connected to a binary signal generating means
for providing a binary control word, a system for dis- 25 pensing reagent distributed over the cross section of the flow stream downstream of the sensors , an
array of reagent dispensers connected to :the •
reagent orifice system, control means connecting each of the dispensers to the binary control word generat- 30 ing means for controlling the release of the reagent
from each of the dispensers in accordance with the
ionic characteristics detected by the sensors, and mixing means in the line downstream of the reagent
orifices to homogenize the flow stream.
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11. An apparatus as set forth in claim 10, wherein a flowmeter directs a signal commensurate to the flow stream to the binary signal generating means to correlate the binary control word to variations in the flowrate of the flow stream.
12. An apparatus as set forth in claim 10, wherein a mixer is provided in a flow stream upstream of the sensors .
13. An apparatus as set forth in claim 12, wherein a mixer is provided in the flow stream downstream of the reagent orifices.
14. An apparatus as set forth in claim 13, wherein the mixer upstream of the sensors is a back mixing passive mixer and the mixer downstream of the reagent orifices is a non-back-mixing - passive mixer.
15. An apparatus as set forth in claim 10 , wherein the dispensers have fully on or fully off characteristics .
16. An apparatus as set forth in claim 15 , wherein the dispensers have capacities which are multiples of each other to facilitate the control function.
17. An apparatus as set forth in claim 16, wherein the capacities of the reagent dispensers are graded in a binary power series .
18. An apparatus as set forth in claim 10, wherein the apparatus is repeated in sequence in the line to facilitate the control.

19. An apparatus as set forth in claim 10 , wherein the apparatus is followed downstream by a
secondary array of ionic sensors distributed across
the crosssection of the line, each of the secondary
array of sensors being connected to a secondary individual antilogging means , each of the secondary individual antilogging means being connected to a •.:
secondary digitizing means, each of the secondary digi¬

10 tizing means being connected to a secondary averaging means, and the secondary averaging means being connected to the binary signal generating means of an upstream
array to adjust the resulting binary control word to
the ionic characteristics of the flow stream.
,c 20. An apparatus as set forth in claim 10 , wherein the reagent orifices are distributed in a pattern which corresponds to that of the sensors in
the flow stream.

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