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1. 1 Pull the waterproof cover along the sensor cable away from the Locknut connector to expose the locknut 2 Connect the connector to the meter body and tighten the locknut firmly so that it won t come loose Align sensor connector with sensor body connector Waterproof cover 3 Move the waterproof cover towards the connector until it firmly contacts the O ring on the meter body Align sensor connector with sensor body connector 4 Next turn the cover 90 degrees in the direction shown in the figure to lock F020201 eps Caution It is recommended that as far as possible you leave the sensor connected to the meter to help ensure that the connector does not get dirty 2 2 IM 12D03D02 01E 2 Preparation Setting Date and Time After installing the batteries set the date and time Note that if the power is turned off after setting minutes start with the date setting when you turn on the power next time If you replace the batteries the date is not affected but the time is reset Reenter the time Caution If the sensor is not connected then an error will be displayed on the meter e Setting method After installing batteries press and hold the key for at least one second Then all display elements turn on and the date setting display automatically appears Set year month day hours and minutes as follows Caution If you stop part way through the date and time setting then the meter wil
2. ge day ay o F040307 EPS The calendar functions will be correct through to the year 2090 4 12 IM 12D03D02 01E 8 Time setting tIME panel For the converter set the time 24 hour display minutes in order 4 Keyswitch Functions Use the AW keys to set hours and minutes Then press the key to complete setting Hour setting 24 hr clock Minute setting E7771 ZTT ZTT LIL 11 Lt LI 2 ME av Fat Aode En Holle fe Ai IM 12D03D02 01E FOA0308 EPS 4 13 4 Keyswitch Functions 9 Alarm time setting ALM panel Alarm Enable ON Disable OFF and alarm occurrence time hours and minutes can be set Use the AW keys to set alarm time Alarm time setting methods are the same as for 8 Time setting tIME Alarms sounds for about 15 seconds continuously Acknowledge alarm by pressing any key to stop alarm sound If no key is pressed to acknowledge the alarm occurrence alarms sound for 15 seconds again three and six minutes after the preset alarm time Note The day of the week is not displayed i F ENT Ba p rm a D D mm Hour setting 24 hr clock alarm sounds at preset time FENT every day I J a ALA Hoe F ENT Minute setting alarm sounds at EL preset time from Monday to Friday Z a a or i a PL mn
3. Solutions 1mol l 1 10mol 1 1000mol I Lithium benzoate solution 2 28 2 28 Sodium acetate solution 2 20 2 20 2 20 Potassium chloride solution 1 74 1 98 Sodium hydroxide solution 1 74 1 87 Sulfuric acid 1 07 1 38 T0702 EPS Finding Temperature Coefficient If temperature coefficient tables containing the liquid to be measured can not be found measure conductivity twice at two liquid temperatures between 10 and 30 C with temperature coefficient set to 0 00 and use the equation shown below to find approximate temperature coefficient a IM 12D03D02 01E 7 3 7 Measuring Principles of this Instrument 7 4 K2 K Temp coef a x 100 C Ki ta 25 Ka ti 25 where t t2 liquid temperature C K conductivity at ti K gt conductivity at t2 Calculation example To find the temperature coefficient of liquid with conductivity 124 5 S cm at liquid temperature 18 0 C and 147 6 S cm at liquid temperature 31 0 C substitute t 18 0 t 31 0 K1 124 5 K2 147 6 in the equation above thus we can obtain 147 6 124 5 a x 100 124 5 x 31 0 25 147 6 x 18 0 25 23 1 747 0 1033 2 x 100 1 298 Set the temperature coefficient 1 30 in the SC72 meter as meter allows three digits to be entered e Checking if meter is working correctly When the temperature coefficient already set is accurate the conductivity displayed should be constant re
4. Remaining battery life is always displayed stepwise When display is mma battery is normal When a flashing gf __ is displayed battery power is low ae the batteries immediately if the above flashing battery symbol appears Press and confirm that display turns off then refer to Sec 2 1 for battery replacement procedure 2 Temperature compensation setting mode This mark appears when temperature compensation is being set refer to Temperature compensation setting t Co panel in Section 4 3 2 3 Manual range setting mode Normally autoranging is used and optimum range is selected automatically but if fixed manual range setting is used then this mark appears refer to Range selection rnG panel in Section 4 3 3 4 Data save mode This mark appears when measured data are stored or when already stored data are accessed see Operation of DATA key in Section 4 1 or Display stored measurement value in Section 4 3 1 5 HOLD mode This mark appears while measured data are being temporarily held refer to Operation of key in Section 4 1 6 Calibration with standard solution This mode display appears when the calibration with standard solution is conducted refer to Calibration with standard solution CAL panel in Section 4 3 5 7 Cell constant set mode CELL This mode display appears when the sensor cell constants are manually set refer to Cell constant setting C C panel in Section 4 3 4 4 4 IM 12D03D02
5. compensation coefficient setting F030301 EPS 3 4 Saving Measured Value The meter offers two ways of storing measured values HOLD for temporary storage and non volatile data storage that retains data even if batteries are removed 1 HOLD If the HOLD key is pressed during measurement the measured values are temporarily held display no longer changes Press the HOLD key or key to return to the measurement mode dema LE HOLD are aT aes te JU A te se l mm m St a 7 nn pa o DUE the Don g ete or F030401 EPS IM 12D03D02 01E 3 3 3 Measurement 2 Data storage Tf the DATA key is pressed during measurement mark starts flashing Press the F ENT key then currently measured data can be stored in nonvolatile memory Data stored are measured conductivity measured temperature date and time Up to 300 data including individually deleted data can be stored If you attempt to store more data El Hi L is displayed If E HF L L is displayed even though the number of data stored is less than 300 perform defrag refer to Section 4 3 15 Defragment storaged data DFLG panel By doing so you can increase the number of data to be stored To check stored past data refer to 4 3 1 dAt display stored measurement value later in this manual While DATA is flashing press the DATA key or Key to return to measurement mode without storing data
6. moving when the sensor is moved Non slip pads S S F0301 EPS Figure 3 1 Position of non slip seats IM 12D03D02 01E 3 1 3 Measurement 3 2 Measurement Procedures 3 2 Dipping sensor into liquid To help avoid errors due to air bubbles around the sensor element inner electrode immerse the sensor into the liquid to be measured so that its air vent is below liquid level To dislodge any air bubbles from the inner electrode dip the sensor into the liquid and move it up and down two or three times Air vent A Measuring liquid level Electrode element Figure 3 2 If air bubbles are on this section measurement error may occur F0302 EPS Dipping Sensor in Liquid for general purpose sensors IM 12D03D02 01E 3 3 Measurement Panel 3 Measurement Immerse the sensor into the liquid to be measured to display the liquid conductivity on the LCD display There are three measurement panel display types the standard display calendar and clock display Use the key to toggle the display type Standard display Calendar displ ay Clock display conductivity ama L a ann a ac 1 700 us Measuring liquid day month year hour minute 4 temperature Temperature compensation coefficient This display appears when NaCl Naci solution is specified at temperature
7. C F Set the temperature compensation coefficient with the B amp D keys The temperature coefficient you set is displayed here F020601 EPS IM 12D03D02 01E 27 2 Preparation 2 8 IM 12D03D02 01E 3 Measurement 3 Measurement 3 1 Precautions 1 Be sure to check that the cell constant and the temperature coefficient are set correctly 2 Check that the plastic cover for general purpose sensor and outer electrode for high purity water measurement are secure 3 Do not use the SC72 meter to measure liquids with temperatures over 80 C If the whole sensor including cable is immersed liquid temperature shall be below 50 C Do not use the meter to measure extremely corrosive liquids such as solutions of hydrofluoric acid 4 Remove dirt and stains from the meter with soft tissue If necessary wipe the meter case with neutral detergent 5 If any problem with the meter arises during measurement refer to the Troubleshooting section later in this manual to determine the cause 6 After finishing measurement flush stains on the sensor and measured solutions with water and store the meter refer to Chapter 5 Handling of the SC72 Personal Conductivity Meter When the meter is used on a table The meter is designed as a portable instrument however to use it on a table attach non slip pads supplied with the instrument at top and bottom of the meter to stop it from
8. J constant also called cell constant determined by sensor and distance between two sensors From equations 1 and 2 above we obtain E and J are constant so the conductivity K can be obtained by measuring the current I 7 2 IM 12D03D02 01E 7 Measuring Principles of this Instrument 7 3 Temperature Compensation and Finding Temperature Compensation Coefficient e Temperature Compensation Table 7 1 shows the conductivity ratio at each liquid temperature when the conductivity of a NaCl solution at 25 C is 1 Table 7 1 Conductivity Ratios at Different Temperatures in NaCl solutions 0 C 25 C 50 C 75 C 100 C 0 542 1 1 531 2 103 2 677 T0701 EPS As shown in the above table liquid conductivity changes with liquid temperature So in order to compare conductivities conductivity values at a fixed liquid temperature are needed This SC72 meter includes standard temperature conversion functions to display a liquid conductivity value converted to 25 C so this meter can be used for such conductivity measurement comparisons Temperature compensation coefficients of an NaCI solution are stored in the SC72 meter No other temperature coefficient setting is required for NaCl solutions Table 7 2 shows temperature coefficients of various electrolytic solutions Table 7 2 Temperature Coefficients of Electrolytic Solutions Temperature coefficient C
9. be sent freight paid for repair or replacement at Yokogawa discretion to the service department of the relevant sales unit The following information must be included in a letter accompanying the returned items Model code and serial number Copy of original purchase order showing the date Length of time used and the measuring environment Fault symptoms and circumstances of failure Statement whether service under warranty or out of warranty service is requested Complete shipping and billing instructions for return of goods plus the name and phone number of a contact person who can be reached for further information Goods that have been in contact with process fluids must be decontaminated disinfected before shipment and a statement to this effect should be included Safety data sheets for all process components that the goods have exposed to should also be included IM 12D03D02 01E 3 Contents CONTENTS Profa muciocancacin codicia cai cil dannata ereak nahea saeua Taidan peat Enk daiya iaaa 1 1 Outline Features Personal Conductivity Meter Specifications When You Receive This Conductivity Meter Contents of Model SC72 Personal Conductivity Meter Package Component Names and Functions Sensor Part Names and Functions Options Available Separately Spare Parts 2 Preparation 2 1 Installing the Batteries 2 2 Connecting Sensor Cable 2 3 Setting Date and Time 2 4 Setting Temperature Unit 2 5 Setting Cell Con
10. it is displayed If there is no data after it i e it was the last stored data item the data item before it if any is displayed When data item 012 lastest data is deleted Item 012 is deleted so item 011 becomes the latest gt Item 011 is deleted so item numbers of following items only item 012 in this case are decremented by 1 F040300 EPS 4 6 IM 12D03D02 01E 4 Keyswitch Functions F040301 EPS Time stored Year that data was stored ho 5 p g E EE Err sz S a aa an v 2 Jl m ho s E a o a DY Y a i it as it 3 3 3 Oc Ss i Lit MU E ru D J a E a o w g a Sy g D g 3 o an s o m lt DS gt 5 2 nu A a a o Ko Hie 2 E o N E Ray gt a paan E Ss ca DE i cJ ke F ENT Stored measurement data Latest data When no stored data 4 7 IM 12D03D02 01E 4 Keyswitch Functions 2 Temperature compensation setting t Co panel This panel is used to change the temperature compensation type and temperature coefficient setting The TEMP mark appears on the panel e Automatic temperature compensation for NaCl solution e Manual temperature compensation coefficient setting Press the da W keys to select C or F Then press the key Use the Pre
11. qua DATA Haza Dad y mer ete Te a a ne a Abort data storage wre le While commis flashing press para E or teas keys to abort data storage Execute data storage Press key to store data while is flashing ssiop eps IM 12D03D02 01E 4 Keyswitch Functions 4 Keyswitch Functions There are seven membrane keys on the keyboard of the Personal Conductivity meter The following key functions are provided Display the conductivity measured temperature and Display the conductivity date and time temperature coefficient Hold conductivity and temperature measurements Store conductivity and temperature measured data Other functions such as parameter setting When meter is OFF press for at least 1 sec to turn on power When meter is ON press for about 2 sec to turn off the power Automatic Power OFF function default 20 min inactivity If you press this key during measurement mark is displayed and present measured values are held To return to MEAS mode press eoor Ga keys If pressed during measurement Coat mark flashes Auto Power Off D HOLD Press key to store measured DATA values in memory To abort data storage and return to MEAS mode press pma or e key again while mark is flashing IM 12D03D02 01E Press to start measurement mode If already in MEAS mode it switches the display panel If pressed while in M
12. solution Table 5 2 describes how to make KC solution of different concentrations and lists their conductivities Table 5 2 How to make KCI solutions and their conductivities based on JIS K 0102 Dissolve 74 2460g of KCI in water to get 11 at 20 1 C Dissolve 7 4365g of KCI in water to get 7138 11167 12856 o people c Dissolve 0 7440g of KCI in water to get 773 8 1220 5 1408 8 1l at 20 1 C Dissolve 100ml of standard solution C 146 93 avobe in water to get 11 at 20 1 C T0502 EPS 5 4 IM 12D03D02 01E 5 Handling of the SC72 Personal Conductivity Meter Before calibrating the meter with standard solution check that the electrode is clean If stains are found clean the electrode first Also check that the cover of general purpose sensor and outer electrode of sensor for high purity water measurement are secure Cell constant is affected by stains or loose cover When calibrating ensure that measuring range is set so that you can enter conductivity to as many digits as possible For example in the table above the conductivity of standard solution C at 25 C is 1408 8 If the meter is set to autorange or to a manual range of 0 to 2 000 mS cm you could set this as 1 409 four digits However if the range were set to 0 to 200 0 mS cm you could only enter conductivity value as 1 4 only two digits accuracy which is inadequate for calibration with standard solution Before calibrating the meter with standard sol
13. 01E 4 3 Function Modes Outline 4 Keyswitch Functions A variety of functions are supported by function mode Press the key to switch from measurement mode to function mode This mode supports the functions listed in the table below Note The last selected and executed item is displayed when you switch to function mode Pressing the AW keys displays the items listed in Table 4 1 in turn Methods of setting items Use the AW key to move to the desired item While the desired item is flashing press the key to set each item in detail To return from the function mode to the measurement mode press the key Table 4 1 Items set in function mode Display stored measurement value no dAta Temperature compensation setting 0 00 C Range selection Auto Cell constant setting ES Standard cell constant Calibration with standard solution Delete all stored measuring data Date setting 2004 January 1 Time setting 0 hour 0 minute Alarm time setting OFF Set Auto Power Off interval 20 min Set buzzer ON OFF Set measurement unit Set temperature unit Version number display Defragment storaged data 1 Numeric display used to simulate alphabetic character display 2 This data is not user settable 3 The standard cell constant for the connected sensor is displayed IM 12D03D02 01E T0401 EPS 4 5 4 Keyswitch Fun
14. C lI eT After a few seconds nz no Ore ore Fos0s15 EPS 4 18 IM 12D03D02 01E 5 Handling of the SC72 Personal Conductivity Meter 5 Handling of the SC72 Personal Conductivity Meter 5 1 Tips to Maintain Meter Performance The SC72 meter appears to be very simple but is a precision instrument To ensure that measurement accuracy is maintained observe the following precautions regarding preliminary setting measurement maintenance and storage Preliminary setting measurement maintenance and storage Measurement a Preliminary setting wS gt Maintenance e Storage F050101 EPS Table 5 1 Observe the following precautions Setting cell constant e Set specific electrode cell constant Preliminary Setting temperature coefficient setting Set liquid temperature coefficient when the standard temperature conversion is required see Section 2 5 If standard temperature conversion is not requiresd set 0 00 Select one of the three conductivity measurement ranges 0 to Measurement 200uS cm 0 to 200mS cm or 0 to 2S cm corresponding to the type of electrode used Temperature measuring range is 0 to 80 C When measurement is completed thoughly wash electrode to remove the Maintenenace Measured liquid If the electrode gets stained or deformed its cell constant may change In this case calibrate the meter with standard solution see Section 5 4 Avoid high temperatu
15. EAS mode switches to function mode Also used to enter set lue Change set value F040001 EPS 4 1 4 Keyswitch Functions 4 1 Names and Functions of Keys Power ON OFF key If nothing is displayed on the LCD hold down this key for about one second or more to turn the power on If something is displayed on the LCD pressing and holding this key for about two seconds turns power off If no keys are pressed during a certain time interval power turns off automatically refer to A oFF Set Auto Power Off Interval of Section 4 3 10 HOLD key Press the key to hold the currently displayed conductivity and temperature measurement values HOLD mark turns on Press the HOLD key or ao key again to return to measurement mode and turn mark off Data key When the meter is in measurement mode pressing this key causes the mark to flash and the currently displayed conductivity and temperature measurement values to be temporarily stored Pressing the F ENT key while the mark is flashing stores the data and returns to measurement mode To abort data storage press the DATA key or key again the mark turns off and the meter returns to measurement mode Measurement key In measurement mode pressing this key toggles between different LCD display types refer to Section 3 2 Measurement Procedures Tf this key is pressed while in any mode other than measurement mode the instrument retu
16. User s Manual model sc72 Personal Conductivity Meter IM 12D03D02 01E vigilant Yokogawa Electric Corporation 1st Edition Preface Preface Before using the Model SC72 Personal Conductivity Meter read this manual thoroughly For safe use of this meter the meter and the instruction manual include the following symbol marks A WARNING Indicates that serious injury may result if users fail to follow instruction manual procedures Ay CAUTION Indicates that minor injury to personnel or serious damage to the product may result if users fail to follow procedures in the instruction manual A WARNING Do NOT use this instrument where there is a danger of electrical shock Do NOT touch any part of the electrode immediately after measuring very hot liquids otherwise you may get burnt A CAUTION If the meter will not be used for an extended period of time be sure to remove the battery Otherwise battery leakage may occur and may cause damage to the meter or cause erroneous meter operation The contents of this manual are subject to change without prior notice Yokogawa Electric Corporation assumes no liability for damage defects or loss of the product caused by any of the following User error Inappropriate or out of specifications use of the product Use in an unsuitable environment Repair or modification of this or related products by persons other than Yokogawa authorized e
17. a me l FT a uw Naci Shem atc n nun g 5 y E p av O Switching to Function Mode Measurement status a _ ane Ino gt Fal AodE age 22 W av maza LT ELa IM 12D03D02 01E de od AY av on O Reverting to Measurement Mode Measurement status dana no La a Bs 7 lem PL T03 EPS Appendix O Function Mode Set Auto Power OFF av av Alarm time setting Set buzzer ON OFF Set measurement unit Set temperature unit 777 Le DI E O Era L Pines i IL i av av av Entnad E Ent EntnoadE te er hm AoF SEN ay lav 4 dana EE os E s SEU E A kd pal A a TTT Oe M en a ln 17 ALA Pen lis lav E DN ADD A h p ALA Pen _ O Function Mode mn jay Version number display _ a Z dana Y a wo lt gt Oe ALA Pen av EN Fal Aode desa m UM HEr i m T04 EPS IM 12D03D02 01E Revision Record Manual Title Model SC72 Personal Conductivity Meter Manual Number IM 12D03D02 01E Edition Date Remark s Ist Aug 2004 Newly published
18. abled but it is wise to leave it enabled to conserve the batteries Simple alarm clock function The meter can issue an alarm signal at a specified time Even when meter power is turned off the internal clock can issue an alarm signal Internal self diagnostic functions display messages when appropriate Bright easy to view large LCD Displays liquid conductivity liquid temperature temperature coefficient date and time IM 12D03D02 01E 1 1 1 Outline 1 2 Personal Conductivity Meter Specifications Applicable measurement range e Sensors for high purity water measurement cell constant 0 05 cm Conductivity 0 to 2pS cm 0 to 20pS cm 0 to 200 S cm 0 to 40MOQecm Temperature 0 to 80 C For general purpose sensors cell constant 5 cm Conductivity 0 to 20pS cm 0 to 200pS cm 0 to 2mS cm 0 to 20mS cm 0 to 200mS cm Temperature 0 to 80 C e For chemical corrosion resistant sensors cell constant 5 cm Conductivity 0 to 20pS cm 0 to 200pS cm 0 to 2mS cm 0 to 20mS cm 0 to 200mS cm Temperature 0 to 80 C e Sensors for high conductivity measurement cell constant 50 cm Conductivity 0 to 2mS cm 0 to 20mS cm 0 to 200mS cm 0 to 2S em Temperature 0 to 80 C Resolution Conductivity Least significant digit 1 digit Temperature 0 1 C Repeatability Conductivity 2 5 for general purpose sensor on 0 to 200mS cm measurement range Accuracy Temperature 0 7 C in the range 0 to 70 C 1 C when ex
19. alarm sonds once at preset time FO40309 EPS 4 14 IM 12D03D02 01E 10 Set Auto Power Off interval A oFF panel 4 Keyswitch Functions Set the time interval for the power to turn off automatically if no key is pressed during a preset time interval The Interval can be set to between 1 and 120 minutes If 0 minutes is set automatic power OFF functions are disabled so without some care batteries won t last very long 11 Set buzzer ON OFF bZ 0 panel This panel is used to enable or disable the beep buzzer that sounds when keys are pressed FO40310 EPS Use the AYW keys to enable disable Then press the key to complete setting Note this function does not disable the Time Alarm sound in 9 above I DZD jo ot F ENT fy to turn ON enable F ENT to turn OFF disable IM 12D03D02 01E F040311 EPS 4 15 4 Keyswitch Functions 12 Set measurement unit SC U panel Toggle the measurement value units between S cm and S m Use the AYW keys to toggle the measurement value units Then press the key to complete setting E777 eres l k lem EA av to toggle S m F ENT 13 Set temperature unit tP U panel to set Toggle the temperature units between C and F F040312 EPS Use the AW keys to toggle the temperature units Then press
20. cables are disconnected Note The liquid temperature should never be outside the range 0 to 80 C Corrective action Set the liquid temperature to 0 to 80 C Replace the sensor Refer to Sec 1 6 6 2 IM 12D03D02 01E 6 Troubleshooting 3 Err3 Calibration error Cause When the calibration with standard solution is made each time cell constants are changed Err3 occurs if the conductivity of the standard solution is wrong or changed cell constants are beyond 20 of the standard cell constant due to a damaged sensor Corrective action Use correct standard solution conductivity Refer to Sec 5 4 Replace the sensor Refer to Sec 1 6 4 Err6 Meter electronics failure Cause Err6 occurs if the meter electronics fails Corrective action Contact your nearest Yokogawa sales office 5 or Out of measurement range Cause Conductivity is over the maximum value on the range Corrective action For manual ranging select an appropriate range If value exceeds maximum of highest range or when on autorange use a more appropriate sensor see Sec 4 3 3 IM 12D03D02 01E 6 3 6 Troubleshooting 6 3 Causes of Abnormal Measured Value Tf error messages do not occur but measured values seem incorrect check the following Are cell constants and temperature coefficients correctly set Is the sensor properly connected to the meter Are bubbles attached to the electrode portion Is the sens
21. ceeding 70 C Temperature compensation range variable 0 00 to 9 99 C also preset NaCl solution temperature coefficient Measurement converted to conductivity at standard temperature of 25 C Measured liquid temperature 0 to 80 C 0 to 50 C when the sensor cable is immersed in water Ambient temperature 0 to 50 C Construction TEC 60529 IP67 class of protection from environment Power requirement Two of size AA batteries LR6 Automatic power off interval May be set in range 1 to 120 minutes Battery life About 200 hours of continuous use for long life alkaline battery life may vary depending on battery type and ambient conditions External dimensions Approximately 150 H x 61 W x 42 D mm not including protruding portions Weight Approximately 220 g including batteries 1 2 IM 12D03D02 01E 1 Outline 1 3 When You Receive This Conductivity Meter Confirm that all SC72 meter package components refer to Contents of Model SC72 Personal Conductivity Meter Package in Section 1 4 and sensor models described in Sec 1 6 Sensor Part Names and Functions have been received Carefully inspect the meter and sensor referring to Section 1 5 Component Names and Functions when assembling meter and sensor Particular attention should be taken Not to twist or force the cable Not to hit or drop the meter Not to get the sensor connector dirty IM 12D03D02 01E 1 3 1 Outline 1 4 Contents of Mo
22. conductivity measurement cable length 0 75m For SC82 for high conductivity measurement cable K9221XD length 0 75m 1 AA Always AA 1 Waterproofing is not guaranteed if you use SC82 type conductivity sensor in conjunction with SC72 meter 2 Old part number for SC82 conductivity meter FO10601 EPS 1 6 IM 12D03D02 01E 1 Outline Sensor for high purity water measurement General purpose sensor SC72 11 0 AA 1 C72 21 AA 1 SC72 23 0 AA Model number and cell constants display plate i bes a and 11 AA cell constants display plate SC72SN 11 AA 1 SO72SN 21 AAA SC72SN 23 AA Watertight cover Prevents moisture from entering Watertight connector and causing cover leakage between pins Connector Sensor Connects sensor cable to cable Connector conductivity meter Sensor cable Outer electrode Sensor body connection i Sensor gri SUS316 Sensor grip grip stainless seel Inner electrode Inner electrode Sensor body Titanium SUS316 Plastic body can E stainless seel withstand temperatures Edge electrode up to 80 C Titanium Outer electrode Cover Plastic SUS316 stainless seel F010602 EPS Chemical resistant sensor Sensor for high conductivity measurement sc72 31 D Aa s072 41 0 AAa Model number and Model number and cell constants display plate cell constants display plate SC72SN 31 AA 1 SC72SN 41 AA 1 Watertight Watertight cover cover Sens
23. ctions Details about how to set each item are provided below 1 Display stored measurement value dAt panel Used to display stored measurement values mark appears in the top left corner of the display The last stored conductivity and temperature values are displayed first The stored data item number flashes in the lower left corner Pressing the key displays the date and time of this stored data and pressing this key again allows individual data to be deleted refer to the figure next page Pressing AYW keys allows you to scroll through all past data If no data are stored no dAtA is displayed at the bottom of the display e Individual deletion of stored data items After displaying date and time of this stored data pressing the key displays a panel with dEL Pressing the key on this panel switches to the Data Delete panel First 712 is flashing so use AA W keys to switch to flashing Ye 5 then press the F ENT key to delete the stored measurement data that is currently displayed Stored data item numbers after deletions When you display the dEL panel the number displayed at the bottom left indicates the stored data number relative to the beginning of the data store This does not necessarily represent the number of stored data If you delete a data item item numbers of data that follow it will be decreased by one see explanation below e Data display after deletion If a data item is deleted the data item after
24. del SC72 Personal Conductivity Meter Package User s SC72 11 Manual SC72 21 SC72 23 Personal conductivity meter Instrument Card SC72 41 No Name Meter only without sensor With sensor for high purity water measurement cable length 0 75m With general purpose sensor cable length 0 75m With general purpose sensor cable length 3m With chemical resistant sensor cable length 0 75m With sensor for high conductiivity measurement cable length 0 75m Personal conductivity meter Two dry batteries Two instruction manual Non slip pads two Hand strap Instrument card Label language Japanese English The meter model number and cell constants as well as the sensor model no SC72SN AA Always AA shown on the nameplate 1 4 NJoao Ron Son 11 Sensor for high purity water measurement General purpose sensor Chemical resistant sensor Sensor for high conductivity measurement Sensor cleaner five cotton swabs I AA are FO10401 EPS IM 12D03D02 01E 1 5 Component Names and Functions O ring Sensor cable connector Used to connect a dedicated conductivity sensor to the personal conductivity meter Display Displays conductivity temperature and temperature coefficient simultaneous
25. ement O Battery Needs maintenance O Needs recalibration with standard solution Electrode stained O Electrical leakage in connector SC meter failure O Contact Yokogawa F0601 EPS Figure 6 1 Causes of abnormality IM 12D03D02 01E 6 1 6 Troubleshooting 6 2 Error Messages and Corrective Action Table 6 1 Error Message Error message 1 Name Err1 E rr f Temperature compensation computation value out of range Err2 E rr Z Out of temperature measurement range Err3 Er r 4 Calibration error Err6 E rr E Meter electronics failure or wr Out of measuring range Alphabet values simulated on a numeric display T0601 EPS 1 Erri Temperature compensation computation value out of range Cause When the standard temperature conversion is made to conductivity at 25 C this instrument performs temperature compensation computation based on the preset temperature coefficient Errl is displayed in cases where temperature compensation computation is impossible because the preset temperature coefficient is improper or a solution with a large temperature coefficient is measured at temperatures lower or higher than 25 C Corrective action Reset the temperature coefficient to the correct value Measure solution at about 25 C 2 Err2 Out of temperature measurement range Cause This error occurs if the measurement liquid temperature is outside the range 10 to 120 C or if sensor
26. emporary hold a wana TE on 1005 moc Lt 11 30 gt oo LC Ma HOLD ec lyp TA EA Holle odo 22 goo 22 dana nm Lt EA Ria aY en O Storing data Haza a Mao e NENE 120 gt 12720 LC a K al oda 227 odo 22 mes IM 12D03D02 01E 1 Appendix O Function Mode Temperature compensation Display stored measurement value setting Range selection Pp ante A al E Le no pd av Ml T av pa T av av EntraodE EncraodE Entraodk OS Ge I AMIA Inn o CLINI th an LOLI Shim a M Shom ar no dA A Cie 25e Dti g ca e fav HER ame ene Cea Haza Ga Chata a te aaah a wey CLL lt gt lt A Naci av 6 0 Aa D iZ iB eLo Ebo eno 5d e MARA Ene am Nr CL LIL a KIC Cie eso Eto x a 370 LILI m Shn Di min ox fer IT mor Cui LIL La ms Bi dEl Gti dEl E 163 a UZE no gt LS av Dto dEl Di dEl i 2 IM 12D03D02 01E O Function Mode Calibration with Appendix Delete all stored Cell constant setting standard solution measurement data Date setting Time setting qaam dema rr ro Lire pg an Se gt A Li ritjwse av ay ay Frat nod Fri nade EntraodE ll ll e dana azn ENT mc oy 7 pa Lint ft Lt CELL m sl lem Naci lem EL 25 he En Holle aria je Mics Neza der
27. g batteries in the meter When installing batteries observe correct polarity battery orientation Failure to do so may damage to the meter Remove batteries from the meter if it is to be stored for an extended period of time Do not leave dead batteries in the meter They may leak and cause meter failure or erratic operation of the meter When replacing batteries replace both batteries at the same time If only one battery is replaced the new battery may discharge into the old battery which may leak chemicals and damage the meter If the battery box gasket is damaged or dirty then the unit may no longer be waterproof replace the gasket in this case 1 Loosen the battery box cover with a coin or the like 2 Remove battery cover and install batteries as shown in figure 3 Check for foreign material on sealing gasket around E battery box 4 Secure tip of battery box gt cover in the battery box and close the cover 5 Tighten the battery box cover with a coin or the like F020101 EPS Gasket IM 12D03D02 01E 2 1 2 Preparation 2 2 Connecting Sensor Cable Connect the sensor cable as shown below A CAUTION Select a relatively moisture free location when connecting the sensor cable Take care not to wet or dirty the connector when connecting the sensor cable Model SC82 sensors can be connected but these are not guaranteed to be waterproof when used with this meter
28. gardless of liquid temperature within permitted temperature range Check that the temperature coefficient already set is accurate When the liquid temperature is lowered if a larger conductivity is indicated the temperature coefficient already set is too small whereas if a smaller conductivity is indicated the temperature coefficient already set is too large In such a case change the temperature coefficient such that the measured conductivity does not change with temperature Wetted Part Materials of Sensors e For general purpose sensor Titanium sensor Polyphenylene sulfite resin Polypropylene resin insulated area and cover Fluoro rubber O ring e Sensor for high purity water measurement SUS 316 stainless steel electrode element Polypropylene resin insulated area Fluoro rubber O ring e Chemical resistant sensor Glass platinum black electrode element Sensor for high conductivity measurement Glass platinum black electrode element IM 12D03D02 01E Appendix Appendix Key Operation Flow Chart for reference Typical screens are shown Refer to the corresponding section in the body of the manual for details O When turn on power Toggle display type desa Imo a pa 195 or 3395 so lem Naci Poma E Goo date eat First ti d e Piera lE dara ST NENE cont 17 4 6 ta E de YERr 04 TA av jE ce dana mJ tau oa de Aon i3a de day av em T
29. l beep and the date and time will not be updated After pressing key for at least 1 sec Year setting Month setting CTEMP JC man TAAA LD J _CAL a a a Leos bie AAA LILA l CELL mus After NaCl C F kMQ cm several a _ AP oset F ENT to confirm Day setting Hour setting 24 hour format Minute setting GEA TT AV o D toset NL i Ls F ENT im a uy e QUE an to confirm IZ mt mr im CHEMPCMAN ata J HoLD _CcaL lt _ lt gt a T I I BIETE AT re o AII an T C F kMolem several NaCl esL III i Z ICF seconds ZSZ 021 020 020 020 121 121 121 C at AIC F020301 EPS IM 12D03D02 01E 2 3 2 Preparation 2 4 Setting Temperature Unit Default temperature units are C To change to F refer to Sec 4 3 13 Set temperature units tP U panel 2 5 Setting Cell Constant Even for sensors of the same type each sensor has its own distinct cell constant So set the proper cell constant as indicated on the sensor cable Whenever sensors are replaced be sure to change the cell constant setting in the meter accordingly Cell constants once set are stored in non volatile memory and are not lost even when the batteries are replaced e Setting cell constants Press the key to switch to function mode Then select the C C di
30. lling O rings and gaskets clean them and their mounting surface with a cloth moistened with alcohol so that they are free from dirt Otherwise water resistance may not be assured IM 12D03D02 01E 5 7 5 Handling of the SC72 Personal Conductivity Meter 5 8 1 Replacing O rings Install the O ring on the cylindrical flat part as shown in the figure O ring F050501 EPS 2 Replacing gaskets Install the gasket with its raised part facing downwards on the groove of th meter case Gaskets are symmetrical on the right and left and on the front and rear pee Gasket E meter top Lap Raised part 1 ax a zat A ZZZZZZTR TI PROTA TITITIZZ Sa O F050502 EPS IM 12D03D02 01E 6 Troubleshooting 6 Troubleshooting 6 1 Causes of Abnormal Conductivity Display The measured temperature is stable but the conductivity reading is unstable or an unrealistic value is displayed check the following 1 Is maintenance required and has handling of the meter been adequate 2 Does the battery need replacement 3 Is SC72 meter unserviceable If any problem is evident follow the procedure shown in Section 6 2 to determine the cause and fix the problem If you cannot fix it contact your nearest Yokogawa sales office Displayed value unstable Abnormal Displayed value unrealistic Error message displayed Components need replac
31. ly Key switches PERSONAL SC METER IM 12D03D02 01E 1 Outline Battery box cover fixing screw Instrument name plate with model number and serial number F010501 EPS 1 5 1 Outline 1 6 Sensor Part Names and Functions Four types of sensors are available for use with the Model SC72 Personal Conductivity Meter 1 sensor for high purity water measurement cell constant 0 05 cm 2 general purpose sensor cell constant 5 cm 3 chemical resistant sensor cell constant 50 cm and 4 sensor for high conductivity measurement cell constant 50 cm Check the model number and cell constant on the name plate to confirm which type of sensor you have Model number and cell constants display plate example Cell constants SUFFIX YOKOGAWA gt Made in Japan SC72SN Conductivity sensors for personal conductivity meter Specificati Conductivity sensor for personal conductivity meter For SC72 for high purity water measurement cable length 0 75m For SC82 for high purity water measurement cable K9221XB length 0 75m 1 For SC72 for general purpose type cable length 0 75m For SC72 for general purpose type cable length 3m E For SC82 for general purpose type cable length 0 75m K9221XA For SC72 for chemical resistant type cable length for chemical resistant type cable length K9221XC for high
32. man Fixed range 2 MAN Fixed range 2 A aan a ES en Sdel 0 20 00mS cm ens ERE 0 20 00mS cm INIA a x A MMT E a a Vem am Pa g man Fixed range 1 MAN Fixed range 1 m Slm 3 rab Sd i 0 200 0mS cm rab ER i 0 200 0mS cm fad g y y rm E o Press A key 2 x oa 3 A 7 or W key 3 With sensor for high conductivity With sensor for high purity water five times El measurement SC72 41 1 measurement SC72 11 1 amp Fixed range 1 g ma a Autorange Autorange ES eno rab Y v E A amp E Cuan Fixed range 4 Cuan Fixed range 4 cab EEY 0 2 000MS cm cag Puy 0 40 0MAcm r g v v Co 3 4 4 z Cian Fixed range 3 CHAN Fixed range 3 E rot ECT 3 0 20 00mS cm ent PU 0 2 0004S cm v v a a Cant Fixed range 2 Caan Fixed range 2 Set range 1 fixed rob Etel 0 200 0mS cm ras Piel 0 20 004S cm Y Y a a Cuan Fixed range 1 Cuan Fixed range 1 1 Model no of sensor alone is SC72SN refer to Sec 1 6 rob EC 0 2 000S cm ros Pu 0 200 04S cm y y F040303 EPS IM 12D03D02 01E 4 9 4 Keyswitch Functions 4 Cell constant setting C C panel This panel with the CELL mark is used to set the cell constant manually Use the AW keys to set the cell constant Then press the key Typical cell constants are as follows For pure water sensor SC72 11 0 05 cm For general purpose SC72 21 23 and chemical resistant sensors SC72 31 5 cnr Sensors for high conductivity measure
33. ment 50 cm When setting the cell constant you should check the nameplate attached to sensor cable for the model number and cell constant The cell constant can be set in the range 20 of standard cell constant For example for general purpose sensors with standard cell constant of 5 cmr a cell constant ranging from 4 00 to 6 00 can be set Once the cell constant is set it remains stored in memory even when batteries are removed The general purpose cell has the same cell constant whether used with SC72 21 or SC72 23 type Refer to Sec 2 4 for cell constant setting procedure TT LTT E 7 mi Use AV key to set l gt La l ll Ll the cell constant Then press lex the F ENT key to complete setting F040304 EPS IM 12D03D02 01E 4 Keyswitch Functions 5 Calibration with standard solution CAL panel This panel is used for calibration with standard solution Refer to Sec 5 4 for a description of the calibration procedure In CAL mode the mark appears at the top of the panel and all digits of the present measurement value flash key to display the measured value at that time Only the least significant digit flashes Use the A W keys to set the desired key to complete the calibration The meter internal cell constant is changed after completing calibration with standard solution Referring to 4 cell constant setting C C panel confirm the updated cell constant val
34. ngineers IM 12D03D02 01E 1st Edition Aug 2004 YK All Rights Reserved Copyright 2004 Yokogawa Electric Corporation k Preface Liquid crystal display LCD display characters The numeric LCD display is used to mimic alphabetic characters as shown below Alphabet Display Alphabet Display Numerals Display D amp CF Fin DOoO D All display elements shown ON xannmano omMiannm cw wm H ote ES Je FOO EPS Note Regarding Panels Shown in this Manual Panels shown in this manual should be regarded as examples Actual panel format may vary depending on parameter settings and on type of connected sensor Showing all display elements lit Display gray represents flashing state Flashing state T it Lit state H l i gt 0 au a o aa 2 IM 12D03D02 01E Preface Warranty and Service Yokogawa products and parts are guaranteed to be free from defects in workmanship and materials under normal use and service for a period of typically 12 months from the date of shipment from the manufacturer Individual sales units may offer different warranty periods so the original purchase order should be consulted for the conditions of sale Damage caused by normal wear and tear inadequate maintenance corrosion or due to chemical processes is excluded from this warranty coverage In the event of a warranty claim any items that are considered to be defective should
35. or cable Connector Connector Sensor cable z Sensor grip Sensor grip Air vent Sensor body glass Sensor body glass Air vent Inner electrode Inner electrode platinum black platinum black 1 SC72SN 0 will be described on sensor s name plate for the model number roes IM 12D03D02 01E 1 7 1 Outline 1 7 Options Available Separately The following options are available for the Personal Conductivity Meter for your convenience When ordering specify part number shown below Standard solution Part no K9221ZA 0 1mol l NaCl solution for calibration 250ml Soft case Part no B9269KJ Unit mm This soft black carrying case holds conductivity meter and sensor Sensor stand Part no K9220XN This stand holds the sensor when the conductivity meter is used on a table Itis made of rustproof stailess steel 1 8 Spare Parts F010701 EPS O rings and gaskets are important parts to ensure that the SC72 meter is water resistant Replace these parts as required Refer to Section 5 5 Storage and Maintenance for replacement O ring and gasket set Part no K9654AY Two battery box gaskets Two sensor connection O rings Q F010801 EPS 1 8 IM 12D03D02 01E 2 Preparation 2 Preparation 2 1 Installing the Batteries Install the batteries first Ay CAUTION Select a relatively moisture free location when installin
36. or damaged or dirty 6 4 Other conditions e An alarm sounds The alarm clock is set see Sec 4 3 9 and change setting as required e To Enable Disable Key Press Audible Feedback buzzer Refer to Sec 4 3 11 to change setting as required 6 4 IM 12D03D02 01E 7 Measuring Principles of this Instrument 7 Measuring Principles of this Instrument 7 1 What Is Conductivity Conductivity of a solution is defined as the ability of the solution to conduct electric current It is the reciprocal of the resistance between two sensors both of areas 1 m2 at a distance of 1 m apart in the solution 1 S em 100 S m Figure 7 1 shows the conductivities of typical solutions 0 01 0 1 1 10 100 mS m 0 1 1 10 100 1000 mS cm 1 10 100 1000 mS cm 0 1 1 10 100 S m Water acid Salt water 1 to 27 Deionized Strong acid and water alkali solutions Distilled water Reservoir water Sea water F0701 EPS Figure 7 1 Conductivity of Typical Solutions IM 12D03D02 01E 7 1 7 Measuring Principles of this Instrument 7 2 Principles of Operation AC power supply Ammeter F0702 EPS Figure 7 2 Operational Schematic Dip two metallic plates used as sensor electrodes in a solution and apply a certain voltage to flow current I E Re where Rc solution resistance between two sensors Vis dia 0 The relationship between Rc and conductivity K is expressed by Respe 1 adecco 2 K where
37. re high humidity storage locations TO501 EPS IM 12D03D02 01E 5 1 5 Handling of the SC72 Personal Conductivity Meter 5 2 Washing the Electrode Dirt or stains on the electrode may have an adverse effect on the cell constant thereby making accurate conductivity measurement impossible Therefore after measurement rinse the electrode in clean water for example tap water to remove stains Even if staining is not apparent the sensor performance may have changed If so wash the electrode by moving the sensor up and down in hydrochloric acid about 0 1 mol l or water with a little neutral detergent dissolved in it For general purpose and pure water sensors if the electrodes are difficult to clean wipe them gently from top to bottom with a cotton wool swab After cleaning the electrode rinse it in water e General purpose sensor The figure below shows the general purpose sensor with the cover removed Remove the cover and wipe stains off the electrodes inner electrode and tip element with a cotton swab Rinse in a cleaning solution consisting of water containing a little neutral detergent to remove stains from the electrode After cleaning wipe the electrode element inner and edge electrodes with tissue paper or cotton wool Inner electrode titanium Edge electrode titanium F050201 EPS e Sensor for high purity water measurement Remove the reference electrode part and wipe the electrode elements the shaded part
38. rns to measurement mode If you want to cancel any operation pressing this key returns you to measurement mode Av Setting change key Used to change settings 4 2 IM 12D03D02 01E 4 Keyswitch Functions Entry key In measurement mode pressing this key switches the meter to function mode see Section 4 3 Function Modes This key is also used to confirm set values Buzzer Beep sound When a key is pressed the buzzer beeps Where the buzzer beeps once or when it beeps three times continuously the meaning is as follows 1 When the buzzer beeps once This means that key operation was accepted 2 When the buzzer beeps three times continuously This means that the key operation was not accepted To disable the above key entry beep refer to Sec 4 3 11 Set buzzer ON OFF bZ o panel Note the sound volume level of the beep cannot be adjusted by the user IM 12D03D02 01E 4 3 4 Keyswitch Functions 4 2 Liquid Crystal Display and Display Items Displays and their explanations are shown below A EEEE DATA HOLD J _CAL Cl Cl Cl C Manual range setting mode a l 1 l 1 I I l DATA Data save mode HOLD HOLD mode Remaining battery life display TEMP Temp compensation setting mode LLL CAL Calibration with std solution CELL Cell constant set mode II II CEL Nacl9 CF EMO TT a cm ere er a erie er make 1 Remaining battery life display WATA
39. s in the figure with tissue paper or cotton wool Cotton wool swab N Internal electrode Reference electrode contact Reference electrode poso202 EPs Corrosion resistant sensors and sensors for high conductivity measurements Use a beaker or the like containing water dilute hydrochloric acid or weak neutral detergent move the sensor up and down so it is immersed up to the air vent and wash in tap water to clean out the air vent 5 2 IM 12D03D02 01E 5 Handling of the SC72 Personal Conductivity Meter 5 3 Cleaning and Drying Connector Tf there is an electrical path between the connector pins solution conductivity cannot be measured correctly Clean the connector shown in the figure with a dry cloth or a cloth moistened with pure undiluted alcohol to remove moisture and or stains If necessary use a hair dryer to dry any section that is likely to be difficult to wipe O ring Wipe off stains and or moisture on meter connector with a dry cloth Check that there are no stains on the O ring Hot air Use a hair drier if necessary to remove moisture from connector of sensor cable F050301 eps Ay CAUTION For free from moisture use pure undiluted alcohol to clean the connectors Dry connectors completely IM 12D03D02 01E 5 3 5 Handling of the SC72 Personal Conductivity Meter 5 4 Calibration with Standard Solution Note Calibration with standard solution means to measure a standard solu
40. splay with the AY key and access the cell constant setting display with the key Use the AY key to set the cell constant then press the key to confirm it Refer to Sec 4 3 4 2 4 IM 12D03D02 01E 2 Preparation F ENT for Function mode FO20501 EPS You can abort this procedure at any time by pressing to revert to measurement mode IM 12D03D02 01E 25 2 Preparation 2 6 Setting Temperature Compensation Coefficient As described in Section 7 3 liquid conductivity varies with liquid temperature Therefore if concentration is measured by conductivity the conductivity must be converted to equivalent conductivity at a certain temperature This instrument incorporates standard temperature conversion functions to convert liquid conductivity measurements to equivalent conductivity at 25 C To display equivalent liquid conductivity at 25 C set the temperature compensation coefficient as described in this section Temperature coefficient for NaCl solutions is stored in this instrument If any other solution is used set the temperature compensation coefficient manually Refer to Sec 4 3 2 Temperature compensation setting t Co panel 2 6 IM 12D03D02 01E 2 Preparation e Set the temperature compensation coefficient F ENT for Function mode av select t Co F ENT for t Co panel For NaCl solutions Manual setting TT LTT are NaCl av C Lime select NaCl or m ELO I
41. ss the da W keys to select NaCl Then press the APY keys to set the temperature coefficient Then press the LIL Use AV keys to select NaCl E ELO For NaCl When NaCl is displayed press F ENT key to confirm O wer ELA For manual setting When C or F is displayed set the temperature coefficient with AY keys Press Frent key to complete the temperature coefficient setting F040302 EPS 4 8 IM 12D03D02 01E 4 Keyswitch Functions 3 Range selection rnG panel Change the current measuring range Use the A W keys to change between autoranging and fixed range For fixed range mark appears Relationships between automatic and fixed ranges for different sensors For general purpose sensor For chemical resistant sensor Example M SC72 21 23 1 8072 31 1 For general purpose sensor SC72 21 23 used with 0 200 0mS cm a a Autorange Autorange cat cab v Y 4 4 Cuan Fixed range 5 Cuan Fixed range 5 cal 565 0 20 004S cm cn ERS 0 20 004S cm v v a a MAN Fixed range 4 MAN Fixed range 4 en Sd 0 200 04S cm rob ERY 0 200 01S cm y y a a Can Fixed range 3 Cuan Fixed range 3 eat 503 0 2 000mS cm rab A3 0 2 000mS cm 7 Y y Autorange 3 4 a z
42. stant 2 6 Setting Temperature Compensation Coefficient x 3 Measurement 3 1 Precautions 3 2 Measurement Procedures 3 3 Measurement Panel 3 4 Saving Measured Value 4 Keyswitch Functions 4 1 Names and Functions of Keys 4 2 Liquid Crystal Display and Display Items 4 3 Function Modes cococccccccciccccccnnnincnacanoncno 5 Handling of the SC72 Personal Conductivity Meter 5 1 Tips to Maintain Meter Performance 5 2 Washing the Electrode 5 3 Cleaning and Drying Connector 5 4 Calibration with Standard Solution 5 5 Storage and Maintenance 6 Troubleshooting 6 1 Causes of Abnormal Conductivity Display 6 2 Error Messages and Corrective Action 6 3 Causes of Abnormal Measured Value 6 4 Other conditions 7 Measuring Principles of this Instrument 7 1 What Is Conductivity 7 2 Principles of Operation z 7 3 Temperature Compensation and Finding Temperature Compensation Coefficient 7 3 7 4 Wetted Part Materials of Sensors Appendix Revision Record AMNAORWDYH Zirai Pee Bike sah a ee enoodmAwODAS a 4 IM 12D03D02 01E 1 Outline 1 Outline The Model SC72 Personal Conductivity Meter is an accurate portable easy to use conductivity meter It includes not only self diagnostic functions to help ensure validity of readings but also data storage functions to allow users to check past data The meter is of waterproof construction so tha
43. t it can safely be used outdoors on a rainy day and can also withstand being accidentally dropped into water 1 1 Features Water resistant case When this meter is used with its dedicated sensor it meets the requirements of class IP67 Degree of Protection to be Provided by Enclosures in IEC 60529 Wide measurement range and convenient Auto Range function Sensors are available to cover measurement ranges between 0 to 2 000 mS cm and 0 to 2 S cm Auto range functions automatically set the optimum measurement range making measurement easy Automatic temperature compensation Automatic temperature compensation functions are provided for liquid measurement Conductivity referenced to 25 C can be obtained in solutions with temperature coefficients between 0 00 and 9 99 C The temperature coefficients for NaCl solutions are already stored in the meter Calendar and time functions Internal time functions allow one touch checking of measurement date and time Data storage function Up to 300 conductivities and temperature measurements and their measurement date and time can be saved This function allows you to check past measurement data Automatic power off function The meter will power off automatically if not operated during a preset time interval The time interval can be set in one minute increments in the range 1 to 120 minutes to meet your application requirements This automatic power off function can also be dis
44. t significant figit of the is flashing measuremet value is flashing NaCl Wait until the measured value is stable AV Set the conductivity of the standard solution NaCl C F050401 EPS Refer to Section 4 3 Function Modes for temperature coefficient and cell constant settings 5 6 IM 12D03D02 01E 5 Handling of the SC72 Personal Conductivity Meter 5 5 Storage and Maintenance e Method of storage Care is required when storing the SC72 meter To maintain the SC72 meter in good condition observe the following 1 After measurement thoroughly wash the sensor in water 2 Leave the sensor connected to the meter body to protect the connector from staining Connector contamination could affect connector leakage resistance and thus conductivity reading accuracy or affect the waterproofing afforded by the O ring 3 Do not place any object on top of the sensor or on the top of SC72 meter e Storage location When the SC72 meter is not being used store it in a safe place If it is to be stored for a long time store it In a dry place low humidity at normal temperatures Out of direct sunshine Do not store it in a corrosive gas atmosphere In a location free from water condensation e Replacing O rings or gaskets Gaskets for the battery box and O rings for sensor connections can be replaced If they are very dirty or damaged replace them with new ones Ay CAUTION When insta
45. the key to complete setting c eS av to toggle F ENT to set F040313 EPS IM 12D03D02 01E 4 Keyswitch Functions 14 Version number dispaly VEr panel Displays program firmware version number Can t be set by the user F040314 EPS IM 12D03D02 01E 4 17 4 Keyswitch Functions 15 Defragment storaged data dFLG panel Up to 300 data can be stored Unnecessary data can be individually deleted as in 1 Stored measurement data panel dAt At the same time individual deletion does not free up memory occupied by deleted data so E ol L L may be displayed even though less than 300 data are stored In such a case use defrag functions to compact storage and free up the space occupied by deleted data thereby allowing up to 300 data to be stored While data defrag is in progress do NOT turn off the power In addition before starting data defrag check that the battery power is normal to avoid battery voltage dropout during defrag Performing data defrag If the key is pressed from the display shown below mi flashes Use the AW keys to select Ye 5 then press the key While defrag is in progress WAIt flashes Note if only a few data are deleted you may not even see it When defrag is complete End is displayed if only a few data are deleted you may not see this F ENT to execute LEZ E777 Lice ft Z Cad gt A I 0 S
46. tion of accurately known conductivity and to adjust SC72 meter so that the displayed measured value is the same as the known conductivity value of the standard solution If the sensor has been used for a long time and does not look clean despite washing recalibrate the SC72 meter with standard solution to check if cell constant is normal If E nr occurs during calibration with standard solution replace the sensor Note that if calibration with the standard solution shows that the cell constant has changed update the cell constant value on the sensor cable with the new data Notes for calibration with standard solution Types of standard solution Use NaCl sodium chloride or KCI potassium chloride solutions 1 NaCl sodium chloride solution When NaCl solution is used the temperature coefficient of NaCl is built into the temperature compensation functions of the meter so conductivity converted to 25 C can be readily obtained regardless of liquid temperature Standard NaCl solution of 0 1 mol l normal unit expressing concentration of solution is available as an option from Yokogawa For more details see Section 1 7 When the sensor for high purity water measurement is used dilute the standard solution with pure water to obtain 0 001 ml l solution of conductivity 1 wS cm Conductivity is as follows 0 1 mol NaCl solution conductivity 10 67 mS cm at 25 C 0 001 mol l NaCl conductivity 123 9 mS cm at 25 C 2 KCI
47. ue and rewrite the cell constant refer to the value on the plate attached to the sensor cable Rewritten cell constants remain even if batteries are removed After the measurement stabilizes press the calibration value then press the To abort calibration using standard solution press the key to return to measurement mode All digits of measurement value are flashing Least significant digit is flashing TT LTT CAL el l hie m s NaCl _ Jem 2 Sie av EL mo ry et l m S NaCl em E Subte Press the F ENT key to complete calibration FO40305 EPS IM 12D03D02 01E 4 11 4 Keyswitch Functions 6 Delete all stored measuring data dEL A panel This panel is used for deleting all stored data When you switch to this panel i is flashing Use the 4AW keys to select y E Ln Press the key to delete all the data completely dELA no YES a a amp 6 a AV o a a Fat Rode Jose SEL ALL dEL ALL EN F ENT to abort F ENT to execute delete all FO40308 EPS 7 Date setting dAtE panel Set the date for the meter year four digits month day in order Use the AYW keys to set year month and day Then press the key to complete setting Year setting Month setting 7TT lan uE IL bore L JE ie LU Wee l av Fal AodE de YEA rem dk Aon av Day setting ZIL
48. ution Check and set the following items before calibrating the meter with standard solution 1 Check sensor for stains Check that there are no stains on the sensor Also check that the meter cover for general purpose sensor or outer electrode for sensor for high purity water sensor are not loose 2 Setting temperature coefficients When the meter is calibrated with a NaCl solution set a temperature coefficient indicated by NaCl for NaCl solution When it is calibrated with a KCI standard solution set a temperature coefficient of 0 00 C 3 Standard solution temperature For a NaCl standard solution check that the standard solution temperature is in the range 25 C 10 C For a KCI standard solution stabilize its temperature at 25 C 1 C or 18 C 1 C If it is difficult to maintain the above temperatures set the temperature coefficient of KCl standard solution in the meter To find the temperature coefficient refer to table 5 2 above and to Section 7 3 Temperature Compensation and Finding Temperature Compensation Coefficient IM 12D03D02 01E 5 5 5 Handling of the SC72 Personal Conductivity Meter Procedures for calibration with standard solution Water EN MN El 0500 Std sol AV Thoroughly wipe off the Select washing water from the CAL mode electrodes before immersing the sensor in standard solution Wash sensor with water completely Whole measurement value Leas

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