Honeywell 4905 Style Conductivity Cells 70-82-25-18 User's Manual
Contents
1. 3 Specifications for 04905 Series eite nantin aqunta h 3 Specifications for 276127 Flow Chamber n nasus 4 INSTALLAT O N S 5 O VePVISW S ya E asp E E ay be 5 rie nude itum t i e RE TRIS 5 The Differences between the Quick Disconnect and Integral Cable Option 5 FlowsEype MOU n ng Ee ore Ceca ede eire ot tede Y Los ON 6 Immersion Type Mounting for 04905 Series Cells essen 6 Insertion Type Mounting 7 ELECTRICAL CONNECTIONS 10 OVeIVIeW Xy tai Sua hese aS mtns Poo e RE QU s olet 10 Instrument Wiring for 4905 Cells with Integral Cable 10 4 2 1 Model 4905 Series with Integral Cable to UDA2182 Analyzer 10 4 2 2 Model 4905 Series with Integral Cable to APT Series Analyzer Transmitter 12 Instrument Wiring for 4905 Cells with Quick Disconnect Cable 13 4 3 1 Wiring Model 4905 with Quick Disconnect Cable to UDA2182 13 4 3 2 Wiring Model 4905 with Quick Disconnect Cable2. 284 For immersion applications 80 C 176 Materials of Construction Cell Body PES polyethersulfone Support Fittings Ryton Electrodes Nickel Platinum or Monel as specified Quick Disconnect Receptacle Stainless Steel Cable Options Leadwire PVC insulated 22 gage cable 0 245 OD 20 and 50 feet lengths available Quick Disconnect Option Mating cables must be purchased from Honeywell Universal Head Aluminum Weight Approximately 1 Ib 0 45 kg If using universal head 3 Ib 1 35 kg Approvals Manufactured to comply with ASME boiler and pressure vessel code Section Ill Div 1 UG 101 CRN 0F11607 5C Insertion 1 NPT male Schedule 40 Flow Chamber Inlet 3 4 MNPT Outlet 3 4 FNPT Insertion Depth 5 to 7 127 to 178 mm depending on cell constant Overall Length Approximately 6 to 8 152 to 203 mm If using universal head 10 to 12 1 4 254 to 311 mm 12 07 4905 Series Conductivity Cells Installation and Maintenance 3 Specifications 2 2 Specifications for 276127 Flow Chamber Parameter Description Maximum Flow 2 gpm 40psig and atmospheric discharge Maximum Pressure 200 psig 25 Maximum Temperature 140 C 284 at atmospheric pressure Dimensions 1 1 2 3 8 cm octagon x 8 3 4 22 2 cm long Sample Inlet 3 4 MNP T Sample Outlet 3 4 FNPT Cell Inle
3. Extension Cables for Sensors with Quick Disconnect Option 2m 6 56 ft 50024092 001 3m 9 84 ft 50024092 002 6m 19 69 ft 50024092 003 15m 49 21 ft 50024092 004 EXTENSION CABLE MUST BE PURCHASED FROM HONEYWELL Cell Extension Leadwire For ATC value of 333 Standard Range of 9782 or 7082 also APT 2000 To 1000 ft 3 conductor 18 gage cable Belden 9493 and 834059 Coax cable Belden 9259 835024 Wide Range 9782 and 7082 To 1000 ft 4 conductor 18 gage cable only 31834052 For all instruments with an ATC other than 333 3 conductor 18 gage cable Belden 9493 only 834059 12 07 4905 Series Conductivity Cells Installation and Maintenance 17 Honeywell Honeywell Process Solutions Honeywell Inc 512 Virginia Drive Fort Washington Pennsylvania 19034 70 82 25 48 1207 Printed in USA http npsweb honeywell com
4. RTH HIGH erouno INTERNAL CELL ASSEMBLY NOTES 2 Eprom cata CONFIGURATION MODEL 4900 SERIES CONDUCTIVITY CELL 7 19 1 EARTH GND E VIEW OF JUNCTION BOX HEAD WITH CAP REMOVED NOTE 1 UDA 2182 ut CONDUCTIVITY RESISTIVITY NOTES ANALYZER ANALYZER INPUT BQARD CONNECTIONS 1 FOR PURE WATER SAMPLES IN NON CONDUCTIVE PLASTIC GLASS ETC PIPING GROUND THE BLACK CELL ELECTRODE LEAD NEAR THE CELL ALTERNATELY CONNECT TO THE UDA GROUND SCREW AS SHOWN DOTTED DO NOT GROUND 10 25 OR 50 CONSTANT CELLS 2 FOR CELL LEADS A AND C USE 16 TO 22 AWG CABLE SHIELDED TWISTED PAIR WITH 30pF MAX CAPACITANCE BETWEEN CONDUCTORS CONNECT SHIELD TO TERMINAL 10 3 FOR COMPENSATOR LEADS B AND D USE 16 TO 22 AWG TWO CONDUCTOR C ABLE 4 CELL TO ANALYZER CABLES ARE CONSIDERED LOW LEVEL RUN SEPARATE F ROM HIGH LEVEL WIRING Figure 4 1 Installation Diagram 4905 Cells with Junction Box head connected to UDA2182 Analyzer 10 4905 Series Conductivity Cells Installation and Maintenance 12 07 Electrical Connections 50 FT MAX RED F CELL LOW TEMP COMP TEN POINT TERMINAL BOARD GREEN EACH TERMINAL WILL ACCEPT A gt BLACK UP 16 AWG STRANDED Q Z WHITE WIRE co 0 ES GREEN CELL r S RED L BLACK
5. so lt CELL CABLE IS APPROX 250 6 4mm INTERNAL CELL ASSEMBLY O D MAX WITH 4 CONDUCTORS OF 18 AWG T 4900 SERIES CONDUCTIVITY CELL CONFIGURATION WIRE 20 FT OR 50 FT CABLE LENGTH a NOTE 1 UDA 2182 CONDUCTIVITY RESISTIVITY ANALYZER f ANALYZER INPUT BOARD CONNECTIONS Direct Cell to Analyzer Installation 50 FT MAXIMUM 1000 FT MAXIMUM e cen I _ _ NOTE 2 TEN POINT TERMINAL BOARD EACH TERMINAL WILL ACCEPT 1 10 Z UP TO 16 GAGE STRANDED f gt WIRE WHITE 7 d e y 4 7 GREEN 5 ES RED 4 7 C NOTE 3 JUNCTIONBOX N _ UDA TERM ED 4905 SERIES CONDUCTIVITY CELL DESIGNATIONS Cell to Analyzer through Junction Box NOTES 1 FOR PURE WATER SAMPLES IN NON CONDUCTIVE PLASTIC GLASS ETC PIPING GROUND THE BLACK CELL ELECTRODE LEAD NEAR THE CELL ALTERNATELY CONNECT TO THE UDA GROUND SCREW AS SHOWN DQTTED DO NOT GROUND 10 25 OR 50 CONSTANT CELLS FOR CELL LEADS BLACK AND WHITE USE 16 TO 22 AWG CABLE SHIELDED TWISTED PAIR WITH 30pF MAX CAPACITANCE BETWEEN CONDUCTORS CONNECT SHIELD TO TERMINAL 10 FOR COMPENSATOR LEADS RED AND GREEN USE 16 TO 22 AWG TWO CONDUCTOR CABLE UDA 2182 CONDUCTIVITY RESISTIVITY ANALYZER ANALYZER INPUT BOARD CONNECTIONS CELL TO ANALYZER CABLES ARE CONSIDERED LOW LEVEL RUN SEPARATE FROM HIGH LEVEL WIRING Figure 4 2 Installation Diagram 49
6. to APT 13 MAINTENANCE U ee sanos ta Coon ea Ronan ac 15 Introd c tl m 15 To Gleanahe Gell eet o Het qt isa et Edd 15 To Check Conductivity System eese mai Maia 15 Platinizing the Cell Electrodes nn enne enne enne 16 REPLACEMENT PARTS AND ACCESSORIES 17 4905 Series Conductivity Cells Installation and Maintenance 12 07 Figures Figure 1 1 4905 Type Conductivity Cell Mounted in a 1 1 4 Schedule 80 Tee Using an Adapter Bushing Figure 3 1 Typical Conductivity Measuring Installation Figure 3 2 Dimension Drawing for 276127 Flow Housing Figure 3 3 Mounting Dimensions for 04905 Series Figure 3 4 Mounting Dimensions for 04905 Series with Junction Box Head Figure 3 5 Mounting Dimensions for 04905 Series with Quick Disconnect Option Figure 4 1 Installation Diagram 4905 Cells with Junction Box head connected to UDA2182 Analyzer 10 Figure 4 2 Installation Diagram 4905 Cells with 20 leads directly connected to UDA2182 Analyzer or N WON ON connected to Junction Box 11 Figure 4 3 Model 4905 Series to APT Series Analyzer Transmitter 12 Figure 4 4 Wiring Diagram for 4905 Cells with Quick Disconnect Cable Connected to UDA2182 Analyzer 13 Figure 4 5 Wiring Diagram for 4905 Cell
7. 05 Cells with 20 leads directly connected to UDA2182 Analyzer or connected to 12 07 4905 Series Conductivity Cells Installation and Maintenance Junction Box 11 Electrical Connections 4 2 2 Model 4905 Series with Integral Cable to APT Series Analyzer Transmitter 2 electrode cond sensor temp l 04905 series cells with leads connected to an APT4000 2 electrode conductivity cell temp 04905 series cells with leads connected to an APT2000 Figure 4 3 Model 4905 Series to APT Series Analyzer Transmitter 12 4905 Series Conductivity Cells Installation and Maintenance 12 07 Electrical Connections 4 3 Instrument Wiring for 4905 Cells with Quick Disconnect Cable 4 3 1 Wiring Model 4905 with Quick Disconnect Cable to UDA2182 Wire Signal Color name Yellow cell Low Wire to chassis ground screw 69 Earth Ground Figure 4 4 Wiring Diagram for 4905 Cells with Quick Disconnect Cable Connected to UDA2182 Analyzer 4 3 2 Wiring Model 4905 with Quick Disconnect Cable to APT 2 electrode cond sensor temp l NOTE Ignore blue and brown wires Figure 4 5 Wiring Diagram for 4905 Cells with Quick Disconnect Cable Connected to APT4000 12 07 4905 Series Conductivity Cells Installation and Maintenance 13 14 Electrical Connections Ba tell mp NEM ke D gt pe s YELLOW Note Ignore black and blue wires _ Figure 4 6 Wiring Diagram
8. Honeywell 4905 Style Conductivity Cells Installation and Maintenance Manual 70 82 25 18 Revision 6 Honeywell Process Solutions Copyright Notices and Trademarks Printed in U S A Copyright 2007 by Honeywell Inc Revision 6 12 07 While this information is presented in good faith and believed to be accurate Honeywell disclaims the implied warranties of merchantability and fitness for a particular purpose and makes no express warranties except as may be stated in its written agreement with and for its customer In no event is Honeywell liable to anyone for any indirect special or consequential damages The information and specifications in this document are subject to change without notice Honeywell Honeywell Process Solutions 512 Virginia Drive Fort Washington PA 19034 12 07 4905 Series Conductivity Cells Installation and Maintenance About This Document Abstract This document is intended to support the installation operation and maintenance of the 4905 Series of Conductivity Cells Revision Notes The following list provides notes concerning all revisions of this document Rev ID Date Notes 0 12 96 This document is the initial Honeywell release of the L amp N manual p n 177667 Rev M2 There has been no significant changes made to this manual The format has been changed to reflect the Honeywell layout 1 6 99 Edits done to add new Model Selection Guide information and to correct some er
9. adapter bushing will be required to use existing conduit Figure 3 4 Mounting Dimensions for 04905 Series with Junction Box Head 8 4905 Series Conductivity Cells Installation and Maintenance 12 07 Installation QUICK DISCONNECT COAX ELECTRODE CABLE APPROX 0 270668 DIA CABLE LENGTHS AVAILABLE 2 3 6 15 METERS MAX TEMP 70 DEG C 158 DEG F Figure 3 5 Mounting Dimensions for 04905 Series with Quick Disconnect Option 12 07 4905 Series Conductivity Cells Installation and Maintenance 9 Electrical Connections 4 Electrical Connections 4 1 Overview The terminal board connections for the various Honeywell measuring instruments are given in the appropriate Figures in this section To avoid the possibility of AC pickup in the cell leads separate them from all AC line voltage wiring or run them in a separate grounded conduit ATTENTION Do not use shielded cable except where shown in the following figures 4 2 Instrument Wiring for 4905 Cells with Integral Cable 4 2 1 Model 4905 Series with Integral Cable to UDA2182 Analyzer FOUR POINT TERMINAL PLATE WITH 6 32 SCREW TERMINALS 1000 FT MAXIMUM RED TEMP COMP L GREEN D WHITE 4 C TEN POINT TERMINAL BOARD EACH TERMINAL WILL ACCEPT UP TO 16 AWG STRANDED WIRE NOTE 2 Tm Es CIA 7 cec HIGH CELL H 6 srawe BLACK A t 5 RTH LOW 4 B
10. cell from filling properly Flow cell housing can be used in line only if a maximum flow of 2 gallons per minute can be tolerated To avoid cracking the 276127 flow cell housing use Teflon tape on cell threads and tighten cell only enough to prevent leakage To install tighten the cell into a 1 schedule 40 pipe tee If the flow cell housing is used assemble the cell and housing and install it in the process flow line or in a bypass line J s ell Location Process a Cooler N 15 81mm gt a n 23383 Figure 3 1 Typical Conductivity Measuring Installation 3 5 Immersion Type Mounting for 04905 Series Cells For use in applications where temperature does not exceed 85 C The cell must be immersed to a level above the cross channel or guard tube hole and must be immersed to 1 1 2 inches above this hole if an integral compensator is used For most immersion applications a 1 2 support pipe preferably CPCV must be threaded into the cell bushing using Teflon tape to seal the threads thus permitting adequate immersion Unless this pipe extension is used do not immerse the top of the bushing To insured that a representative sample is measured at all times the solution must circulate through the channels In quiescent solutions provide sufficient agitation To install the cell determine the length of 1 2 pipe required t
11. for 4905 Cells with Quick Disconnect Cable Connected to APT2000 4905 Series Conductivity Cells Installation and Maintenance 12 07 Maintenance 5 Maintenance 5 1 Introduction If abnormal readings occur this may indicate poor response because the cell is not filled with process solution Check the cell installation Note that a grayish dull surface on the cell plastic normally glassy can result from exposure to temperatures above 140 C The only maintenance which may be required is occasional cleaning in certain applications Cell constants 0 01 0 1 and 1 cannot be used if solution resistance measures less than 1000 ohms unless the cell is platinized in accordance with Section 5 5 2 To Clean the Cell The cell will require cleaning if sludge slime etc accumulates in the flow channels Since the materials of construction are chemically inert chemical agents may be used and are recommended for cleaning the cells The particular cleaning agent used must be selected according to the type of contamination to which the cell is exposed CAUTION The cell housing is PES Polyethersulfone DO NOT clean with acetone chloroform toluene benzene or any other chlorinated hydrocarbon In general soap and hot water are effective and adequate If necessary a soft bristle brush of about 1 4 diameter may be used to clean out the tubular channels of the 10 and 50 constant cells Do not scratch the electrode surfaces Be especial
12. ll Notes 1 Mount cell and flow chamber horizontally as shown above with flow exit up to eliminate possible air gap around cell body 2 If cell and flow chamber must be mounted vertically attach a short length of tubing to flow exit as shown below and form a trap to ensure filing of flow chamber especially at low flow imm Figure 3 2 Dimension Drawing for 276127 Flow Housing 12 07 4905 Series Conductivity Cells Installation and Maintenance 7 Installation y 1 687 N Table F rae Cell Constant X Approx mm 001 5 4 138 0 1 5 4 138 1 5 4 138 10 58 146 50 6 9 175 0 940 Cell cable is approx 0 250 24mm Dia fe 6 4 mm O D max with 4 1 5 38mm Octagon conductors of 18 AWG wire Figure 3 3 Mounting Dimensions for 04905 Series ies See Table gt 1 40mm Cell constant X rox mm 001 5 4 138 Four Point Terminal 0 1 5 4 138 Board for lead wire 1 T 138 connections Each 6 32 5 screw terminal will accomodate one so 69 175 12 or smaller AWG wire g 76mm 0 940 Di 24mm Via 15 38mm Octagon 3 4 female NPT for user s flexible electrical conduit connection For insertion or removal of cell disconnect conduit connections NOTE For existing users with conduit 3 2 x 1 2
13. ly careful not to bend the electrode plates of the 0 1 constant cell Rinse the cell thoroughly in tap water and then in distilled water if available 5 3 To Check Conductivity System 12 07 To check the conductivity system comprising conductivity cell leadwire and measuring instrument the user may desire to make a measurement in a reference solution of known conductivity Control the temperature only within limits consistent with the desired accuracy The 25 C temperature value is suggested The solutions may be prepared in the presence of air The solution must fill the cell during measurement For optimum accuracy in acid measurements above 5 concentration use the Calibration Trim function available in the conductivity instrument See the appropriate Analyzer Transmitter manuals for details on the trim function To check the constant of a cell use a second cell having the same constant and compare the reading of one against the other If the 04905 Series conductivity cell model number contains 333 the normal resistance of the temperature sensor as measured across the red B and green D leads is 8550 ohms at 25 C To check the electrode insulation connect an ohmmeter across the black A and white C leads With a dry and clean cell the resistance should be greater than 50 megohms 4905 Series Conductivity Cells Installation and Maintenance 15 Maintenance 5 4 Platinizing the Cell Electrodes 16 Only
14. nch end coupling is needed For an in line flow mounting only a 1 schedule 40 tee is required The basic cell can be converted to a flow cell for either bypass or in line arrangements by use of the PES flow cell housing Honeywell Part 276127 shown in Figure 3 2 However the temperature and pressure specifications listed for this flow chamber under Specifications apply Types of Mounting There are three types of mounting Flow Immersion for use in applications where temperatures do not exceed 85 C and Insertion Mounting dimensions for each type of cell assembly are given in Figure 3 2 Figure 3 3 and Figure 3 4 The Differences between the Quick Disconnect and Integral Cable Option The cable options of quick disconnect and integral cable do not affect the performance of the cell These options only relate to how the cell is connected to the instrument ATTENTION There are different electrical connections for these options Please refer to Section 4 for instructions NOTE The wire colors for the integral cable and quick disconnect option are not the same Do not use shielded cable except where shown in the following figures e Integral cable means the cable is potted into the cell The cable and cell are one entity and cannot be separated e The quick disconnect option means the cell is connected to the cell by a receptacle on the top of the cell The cell and the cable are separate entities When the time comes to replace
15. o give the immersion needed to keep the cell completely immersed at all times Up to six feet of pipe can be used for the standard cell having seven feet of cable Remove the small bushing at the top of the cell slide it off the cable and replace it with the 1 2 inch pipe At the top of the pipe slide a pipe coupling and the small bushing back over the leadwire as shown in Fig 3 1 or install a junction box to terminate the pipe 6 4905 Series Conductivity Cells Installation and Maintenance 12 07 Installation 3 6 Insertion Type Mounting The cell can be inserted into a 1 N P T threaded opening but it is imperative that the tank or chamber be full under all process conditions Make certain the liquid head is above the cell location A vertical insertion from above or a horizontal insertion can be used To install simply tighten the cell into a 1 N P T threaded opening using a Teflon thread compound such as Teflon tape so that the entire electrode is immersed in the measured solution Allow at least 1 2 inch clearance beyond the end of the cell In applications where vertical mounting is required avoid a position with the cell channels pointed up as this will permit solution to flow down into the open end of the cell and may result in clogging by solids settling in the cell channels See Figure 3 1 11 2 Flow 34 NPT 13 1 4 b 337m Fitting low 7 34 197mm for o f ce
16. r example use a platinum element cell if the cell will measure or be exposed to regeneration acids or bases 12 07 4905 Series Conductivity Cells Installation and Maintenance Introduction The cell constant is selected according to the range of the measuring instrument used and the solution measured In general a high constant cell is used for solutions having low electrical resistance high conductivity and a low constant cell is used for solutions having high electrical resistance low conductivity Automatic Temperature Compensation ATC during the measurement is provided by a built in temperature sensing network located near the cross channel or guard tube holes The cells are molded from Polyethersulfone PES which is resistant to most corrosive chemicals over a wide range of temperatures A common exception is chlorinated hydrocarbons Sample solutions come into contact only with the above plastic and the platinum or nickel electrode surface Any cell can be supplied with either electrode material 2 4905 Series Conductivity Cells Installation and Maintenance 12 07 Specifications 2 Specifications 2 1 Specifications for 04905 Series Parameter Description Cell Constant 04905 Series 0 01 0 1 1 0 10 and 50 as specified Electrode Material Nickel Platinum or Monel as specified Maximum Pressure Limit 1724 kPa 140 250 psig 284 Maximum Continuous Temperature Limit 140
17. rors in the text 2 6 03 Removed obsolete info added DL4000 details 4 9 05 Edit text and add electrical connection drawings for UDA2182 analyzer 5 7 06 Added Platinizing information to Maintenance revised Parts List 6 12 07 Added CRN approval and quick disconnect option References Honeywell Documents The following list identifies all Honeywell documents that may be sources of reference for the material discussed in this publication Document Title ID APT2000CC Transmitter User Manual 70 82 25 95 APT4000CC Analyzer User Manual 70 82 25 104 UDA2182 Analyzer User Manual 70 82 25 119 World Wide Web The following lists Honeywell s World Wide Web sites that will be of Interest to our customers Honeywell Organization WWW Address URL Corporate http www honeywell com Honeywell Process Solutions http hpsweb honeywell com Telephone Contact us by telephone at the numbers listed below Organization Phone Number United States and Canada Honeywell 1 800 423 9883 Tech Support 1 800 525 7439 Service 12 07 4905 Series Conductivity Cells Installation and Maintenance iii 1 6 1 1 2 1 2 2 3 1 3 2 3 3 3 4 3 5 3 6 4 1 4 2 4 3 5 1 5 2 5 3 5 4 Contents INTRODUCTION U u u uu 1 1 SPECIFICATIONS M
18. s with Quick Disconnect Cable Connected to APT4000 13 Figure 4 6 Wiring Diagram for 4905 Cells with Quick Disconnect Cable Connected to APT2000 14 12 07 4905 Series Conductivity Cells Installation and Maintenance v vi 4905 Series Conductivity Cells Installation and Maintenance 12 07 Introduction 1 Introduction 1 1 Overview These cells form the sensing network for industrial analyzers and transmitters designed to make continuous measurements of electrolytic conductivity The cells are primarily suited to measurements in effluents of lon exchangers and distillation columns but appropriate constants are provided for many other applications including measurements in micro electronic component washing and plating rinse effluents Universal in mounting any of the cells can be arranged for immersion for applications where the temperature does not exceed 85 C Insertion 1 NPT or flow type sampling The latter can be achieved by use of a CPVC flow housing a 1 pipe tee schedule 40 or 1 1 4 plastic tee schedule 80 installed in a process line or bypass line as pictured in Figure 1 1 ell Assembly Adapter Bushing Schedule 80 1 1 4 Pipe Tee Guard Tube on Cell 23381 Figure 1 1 4905 Type Conductivity Cell Mounted in a 1 1 4 Schedule 80 Tee Using an Adapter Bushing ATTENTION Please note that specific parameters of your process may prohibit the use of nickel elements Fo
19. t 1 MNPT Materials of Construction Polyethersulfone PES 4905 Series Conductivity Cells Installation and Maintenance 12 07 3 1 3 2 3 3 12 07 Installation 3 Installation Overview The conductivity cell is secured permanently to the 1 N P T bushing which is used for all types of mountings Although the physical appearance of the various cells is the same except for length the cell construction differs according to the constant On the 10 and 50 constant cells the electrodes are short tubes located midway inside the two parallel tubular channels that run lengthwise through the cell and are open to the sample at both ends of the cell The channels are elliptical on the 10 constant cell The 1 0 1 and 0 01 constant cells have a removable cell guard which is screwed onto the cell body to protect the electrode surfaces Electrodes are three disks on the 1 constant cell parallel plates on the 0 1 constant cell and wire wound on the cell body on the 0 01 constant cell Cells must be used with the guard in place or the cell constant may differ from that specified Most of the auxiliary parts which enable the user to achieve the various types of mounting are readily obtained from local suppliers For an immersion mounting only applicable in applications where the temperature does not exceed 85 C with 04905 Series cells only the appropriate length of 1 2 inch pipe e g CPVC and if desired a 1 2 i
20. t may be one of the electrodes in another conductivity cell or a platinum strip sheet rod wire etc Both electrodes of the cell are platinized simultaneously by connecting the negative terminal of the battery see Table 5 1 to both leadwires of the cell Connect the positive terminal of the battery to the auxiliary platinum electrode Note the time lapse and continue the platinizing operation for the time in seconds listed in Table 5 1 Then disconnect the battery and remove the cell Rinse the cell thoroughly in tap water and then rinse in distilled water During the platinizing operation move the cell up and down gently to keep the solution stirred CAUTION The preceding procedure produces a barely visible coating of platinum black on the electrode surfaces Do not attempt to darken electrodes by additional platinization since this will affect the cell performance adversely Pour the platinizing solution back into its container as it may be used a number of times If the cell is not to be installed immediately after platinizing it should be kept submerged in distilled water until put into use as platinum black is not stable when dry Table 5 1 Voltage and Time Limits for Platinizing Cells DC 10 50 Volts ENES 4905 Series Conductivity Cells Installation and Maintenance 12 07 Replacement Parts and Accessories 6 Replacement Parts and Accessories Flow Cell Housing PES Junction Box Legacy updates cap 50028816 001
21. the cell the cable does not have to be replaced The cable can simply be mated with another cell that has the quick disconnect option This option cannot be used in immersion applications The cable must be purchased from Honeywell 4905 Series Conductivity Cells Installation and Maintenance 5 Installation 3 4 Flow Type Mounting The cross channel or guard tube hole in the cell must always be covered by the solution and the solution level must be 1 1 2 inches above these holes When mounting the cell in a pipe tee such as shown in Figure 3 1 have the solution enter the tee from below and exit to the side As shown the guard tube hole is in line with the horizontal pipe run However if it is possible that the pipe line will not be full at all times locate the hole just below the exit pipe to insure flooding of the cell under all conditions As shown in Figure 3 1 always locate the cell on the pressure side not the vacuum side of the pump The flow cell housing an accessory part having 3 4 male inlet and female outlet threads can be used for an in line measurement or in a bypass line as shown in Figure 3 1 depending upon the flow volume or pipe size Adapter bushings are available to convert inlet and outlet fittings to 1 4 female threads See Section 0 The cell must be covered by the solution at all times Therefore make certain the lowest solution head is higher than the cell location See that an air bubble does not prevent the
22. the electrodes having constants 10 and 50 must be replatinized if the velvety black deposit has been rubbed off the electrodes in service or in cleaning or if platinized electrodes are recommended and this black deposit is not present when the new cell is received Always replatinize if a brush was used in cleaning the electrodes The indication of a need for replatinization of the electrodes is loss in sensitivity slow response of measuring instrument erratic behavior of measuring instrument or difficulty in balancing The electrodes of the high constant cells are not visible since they are located near the middle of the flow channels Therefore the need for platinization is only indicated by the effect on the measuring instrument Do not platinize cells intended for high purity water measurements Before platinizing clean the cell with detergent and brush as described in Section 5 2 Support the cell in a cylindrical vessel with the end of the cell raised from the bottom It is not necessary to remove the cell from the fittings for platinizing However the guard tube must be removed from the low constant cells Pour in a platinizing solution to a level above the cross channel To platinize the 10 or 50 constant cells immerse an auxiliary platinum electrode in the solution to a point about midway between the cross channel or tube hole and the open end of the cell This third electrode should be chemically pure platinum Its shape is unimportant I
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