CDE-440 Series
Conductivity Process Cells
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Instructions Manual
Conductivity Cells
CDE-440-001/CDE-440-01/CDE-440-1/CDE-440-5/CDE-440-01T/CDE-442
Index
Conductivity Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Mechanical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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ConductivityCells
3.
Celliscomposedbasicallybytwoboardsortwoconcentriccylinders(electrodes), withwelldefined
geometry.Thespacebetweentheboardsorcylindrescreatesasolutioncollumn, beingsothe
measurementisindependentfromthetotalsolutionvolume.
Theboardsorcylindresgeometyusedwillberelatedtothesolutionsconcentrationforabetterreading
ofdifferentsampleswevarythedistance(and;or)theboardsection.
d
s
Therelation“distance”(d)overthe“section”(s)determinestheCellConstante
= K .
(K) .
Inordertoobtaingoodresultsitisnecessarytochoosethespecificcellforthedesiredapplication. Three
factorsareextremellyimportantinordertochoosetherightcell:theElectrical, theMechanicalandthe
chemical.
! Electrical
Whenreadinganelectrolyteconcentrationofhighresistance, causedbylowquantityof ions, thegreater
sensibilitywillbeobtainedwithbiggerelectrodesandwithasmalldistancebetweenthem. Consequently,
weshalldiminishthecapacitivereatanceofthecell-solutionsystem, increasingthepolarizationtension
frequencysuppliedbytheequipment.
Wewillneedtheinversewhentheelectroliteisveryconcentrate:smallelectrodeswithlongdistancesin
ordertoavoidsaturationandthepolarizationeffectattheelectrodes.
TheCellwillpresentlow "K" forlowconductivityelectrolitesandhigh "K"forthoseofhighconductivity,
consideringthattheequipmentmusthaveanautomaticexchangeoftheadequatefrequency.
! Mechanical
Somesignificantfactorsare:thepressure, temperature, flowspeedandthesolidsuspensionpresence.
onlywhenallthesefactorsareconsideredthatwillbeachievedasatisfactoryperformancewithaminimum
maintenance. Whenthesystemstemperatureandpressurearehigherthanthespecifiedvalues, itmust
beinstalledacoolingsystemwitharestrainingvalvebeforethecellcontact.
In places where the flow speed is very low, it must be provided with a flow increase for a solution exchange.
solidpresencewillinfluencebecauseofobstructionthattheycancauseattheelectrodesorevenasuper
conduction(inmetalcases).
! Chemical
Itisnecessarytoconsiderthechemicalaggressivenessandcloggingcausedattheelectrodes, thiscan
modifythegeometry, alteringtheconstantvalue.
Inthesecases, theelectrodesmustbechemicallyaggressiveandmustbecleanedperiodically.
2
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MechanicalDescription
4.
Basedonprocessconditions, thecellsmustbebuildofmaterialpreviouslyspecified, suchas:Stainless
Steel316, EpoxyorPTFEwithradialelectrodesorSS316annulars, Platinum, Titaniumorothers
dependingonitsresistancetothesolutionschemicalaggressiveness.
Theelectricalconnectionisdoneinisolatedteminalswithceramicbaselocatedatthecastaluminumhead,
SAE323, withlowoxydationdegree, treatedagainstcorrosionandfinishedwithelectrostaticepoxypaint.
TheheadoffersIP-67protection, allowingtheinstrumentationcabletogothrubya ½“NPTthreadedhole
or a ½“ cableknockout.
Cell Models CDE-440-001, CDE-440-01,
CDE-440-1, CDE-440-5 and CDE-440-
01T are called Insertion or Immersion
Cells.
Insertion Cell CDE-440-01
Cell Model CDE-442 is called Toroydal or
Electrodeless Cell, as it does not offer
electrodes. The body material could be
Epoxy or PTFE, where the Toroydal
nucleus (2) are located, indulging an
electromagnetic field, that will generate
an electrical current (called Focault
Current) proportional to the sample
concentration. This type of cell is
recommended for high clogging
concentration and highly chemically
aggressive.
This Cell can only be used with
Conductivity Analyzer Model# CDCN442.
Toroydal Cell CDE-442
3
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TechnicalSpecifications
5.
Model
CDE-440-001 CDE-440-01 CDE-440-1 CDE-440-5 CDE-440-1T
CDE-442
Type
Insertion
Torroid
0.01µS
to 2mS
1µS
to 100mS
10µS
to 150 mS
0.1µS
to 20mS
1mS
to 1S
Range (S/cm)
Cell Constant (K) cm-1
0.1µS to 20mS
0.1
0.01
1
5
0.1
NA
Temperature(@ Atm
Pressure)
0 to 100ºC
10 Kgf/cm2
42 to 2000
0 to 200ºC
0 to 100ºC
Max. Pressure(@25ºC)
Insetion length(mm)
20 Kgf/cm2
90
10 Kgf/cm2
100
54
60
Threaded 1” ½
NPT
Threaded
Point
Process Connection
Body Material
Threaded ¾ NPT
SS316 SS316
SS316
SS316
SS316
PTFE
4
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Installation
6.
Beforeyouinstallyourconductivitycell, pleaseverifyforanypossiblebubblesandifthesampleis
constantlyrenewed.
ELECTRICALCONNECTION
1. Preparethecellinstallationpointinareathatoffersgoodstirring, itispreferredtobeclosetothe
equipment(maximumof10meters-32feet)andexemptofvibrations.
2. Verifyifallthreadedpointsaretied.
3. Proceedwiththeinstrumentationcableconnectionoriginatingfromtheequipment, goingthruthecable
knockoutoftheelectricalconnectionboxandconnectingit totheinterconnectionbase.
Yellow
4
Cable Knockout
Black
3
1
Green
Interconnection
Base
2
Conneection
Box
Red
4. Electrical installation example between the equipment and the cell.
F4
F3
F2
F1
11 Na
17
16
15
14
13
12
Vd
Am
Pr.
5
4
3
2
1
10
9
C
Na
C
SHIELD
5
4
3
2
1
THERMO
8
20
19
18
Vm.
Blind
7
Na
C
MEAS
.
6
CN1
CN2
CN3
CN4
5. Verify if the cable knockouts are firmly attached to its respective interconnection cables. This is
very important so the enclosure still offers IP-67. Sealing is crucial for a perfect performance
6. Be careful with humidity! It will diminish the impedance generating measuring errors. Verify the
cable press and if necessary, dry the area using a hair dryer.
7. Be careful when tying threaded areas, depending on the cable position, it can be cut!
Note: Cell model CDE-442 do not offer a connection box and it is necessary a good
instrumentation cable Sealing only at the equipment, as they do not offer connection cable.
5
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Installation(cont.)
6.
Interconnection Cable
a)Donotcutonmendthecellcables!
Interconnection Cable
Vd.
5
Green
Yellow
Am.
4
Pr.
3
Vm.
Red
2
Blind.
(Anode)
1
(Cathhode)
CELL
EQUIPPMENT
CDE-442 Cell Interconnection
This cell type is also connected directly to the equipment connection barr, so cable terminal pin type are used for
someequipmentcases.
Red
Colorless from Red
Black
Colorless from Shield
Blue
Colorless from Blue
6
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Installation(cont.)
6.
Insertion Type
For a correct conductivity measurement, it is recommended to install the cell as shown on below
Illustration.
The liquid flow must go thru the Sensor and exit thru the holes located at the upper portion of the
sensor. See indicative arrows shown below, showing the recommended liquid flow.
Válve 2
Válve 1
Retractile Insertion Cell
For Retractable Insertion Cell installation, allow the liquid to exit thru the holes located on the upper
portion of the electrode or vice-versa.
FLOW
Torroydal Type
Torroydal cell CDE-442 generally must be installed in a Transfluency Body made out of lower
magnetic permeability material. Special attention must be observed regarding the sample flow being
CELL
CELL
RESERVOIR
PIPING
Flanged
Threaded Point
7
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Maintenance
7.
All OMEGA equipments, are shipped from factory tested and calibrated. When under operation, the
Conductivity Cell must be maintained periodically (the frequency will depend on the process), which
would be basically cleaning, or if necessary, a new calibration.
Cleaning
Dip the electrodes in cleaning solution for 40 seconds, then wash throughly with deionized
water to avoid standard contamination, when it is time to perform a calibration.
Calibration
Equipments with range of 0 to 200µS or higher.
1. Dip cell 3 or 4 times in standard compatible with the equipment range. Wait 1 minute before you
can adjust the A.T.C. (Automatic Temperature Compensation), If necessary, move it vertically (up
and down) in order to eliminate any bubbles.
2. Proceed with the constant adjustment.
3. Repeat the operation "1" two or three times in order to confirm the value.
Calibration for Low Conductivity Reading(Ultra Pure Water)
Range 0.01µS thru 2µS
1. Assemble the Transfluency Cell and wash it well.
PVC TRANSFLUENCY
Hose Connection
1” Cap
1’’ Nipple
1’’ Nipple
1’’ Elbow
Reducer 1’’
3/4”
Conductivity Cell
2. Using a 500 mL beaker, place approximately 400 mL of deionized or distilled water. Using a
Conductivity Meter, adjust the conductivity value to approximately 50% of range value,
"contaminating" with high conductivity water (example: tap water).
3. Fill the transfluency with 146.9 uS/cm standard and return to the beaker many times in order to
rinse and eliminate contaminations. Finally leave the transfluency filled with the standard.
4. Verify the standard conductivity value and thru "constant adjustment" reproduce the same read
value at the equipment to be calibrated.
Repeat this operation many times until you can reproduce at least three times the calibrated value.
8
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Troubleshooting
8.
1) When Calibrating the equipment, the function is not complete
Verify for humidity presence at probes header or at connection box of the equipment.
Another possibility could be the equipments interconnection cable and cell being cut or in short.
2) Reading above Range
First clean the cell and try to calibrate it. If this operation is not succefull, verify the point where the
cell is connected, making sure bubbles are not present and if the solution is flowing normally.
9
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M-4506/0908
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