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Revision Record

Manual Title :

Model SC72 Personal Conductivity Meter

Manual Number : IM 12D03D02-01E

Edition Date

Remark (s)

4th

June 2021 Change of accessories, deletion of optional accessories, revi-

sion of specifications (RoHS conformity standards), etc., full

review

3rd

Aug. 2009 Change of information on EMC compliance: P.1-3

2nd

Apr. 2008 Addition of information on EMC compliance: P.1-3

Addition of CAUTION: P2-2
Correction: P.1, 1-2, 1-6, 2-1, 2-3, 3-1, 3-3, 4-1. 4-5, App-1, App-4

1st

Aug. 2004 Newly published

Summary of Contents for SC72

Page 1: ...User s Manual IM 12D03D02 01E Model SC72 Personal Conductivity Meter IM 12D03D02 01E 4th Edition ...

Page 2: ...nt may result if the user fails to follow instructions WARNING Do NOT use this instrument where there is a possibility of electrical shock Do NOT touch any part of the electrode immediately after using in very hot liquids otherwise you may get burned CAUTION Do not apply physical shock or excessive force to the glass sensor or it may break If the meter will not be used for an extended period of ti...

Page 3: ...bet Display Alphabet Display Display Numerals F00 ai All display segments n 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 n Flashing Displays Flashing messages numbers and digits on the display are indicated in gray in this manual Flashing state Lit s...

Page 4: ...the event of a warranty claim any items that are considered to be defective should 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 m...

Page 5: ...ained in ANNEX II in DIRECTIVE 2006 66 EC How to remove batteries safely Refer to subsection 2 1 Installing the Batteries n How to deipose this product This directive is valid only in the EU This product complies with the WEEE Directive marking requirement This marking indicates that you must not discard this electrical electronic product in domestic household waste Product Category With reference...

Page 6: ...t Procedures 3 2 3 3 Measurement Display Panel 3 2 3 4 Saving a Measured Value 3 3 4 Keypad and Display Functions 4 1 4 1 Keypad Functions 4 1 4 2 Display Items 4 3 4 3 Function Mode 4 4 5 Maintenance 5 1 5 1 For Optimum Meter Performance 5 1 5 2 Washing the Electrode 5 2 5 3 Cleaning and Drying Connectors 5 3 5 4 Calibration with Standard Solution 5 4 5 5 Storage and O ring Gasket Replacement 5 7...

Page 7: ...IM 12D03D02 01E Toc 2 Contents ...

Page 8: ...ement 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 measure...

Page 9: ...splay Digital LCD Indication Conductivity or resistivity solution temperature and temperature coefficient simultaneously various messages Range switching Automatic manual Temperature compensation Temperature coefficient 0 to 9 99 ºC or NaCl coefficient reference temperature at 25ºC Ambient temperature 0 to 50 C Wetted Material General purpose type Cell Constant 5 cm 1 Titanium sensor fluoro rubber...

Page 10: ...ated 80 AM 1 kHz A A Normal performance within the specification limits 20 of the measured value B Temporary degration or less of function or performance which is self recoverable Display value may be affected by strong electromagnetic field EMC Regulatory Arrangement in Australia and New Zealand RCM EN 61326 1 Class B Table2 Korea Electromagnetic Conformity Standard Class B 한국 전자파적합성 기준 B급 기기 가정용...

Page 11: ...ter 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 ...

Page 12: ...8 9 10 No Personal conductivity meter User s Manual and Quick Manual Non slip pads 2 pcs Hand strap Dry batteries 2x AA batteries Sensor for high purity water measurement General purpose type sensor Chemical resistant type sensor Sensor for high conductivity measurement Cotton swabs for sensor cleaning Name Model Suffix code Personal conductivity meter Without sensor With sensor for high purity wa...

Page 13: ...ensor cable connector Display Key switches O ring Used to connect adedicated conductivity sensor to the personal conductivity meter Displaysconductivity temperature and temperature coefficient simultaneously Can attach hand strap here Instrument name plate with model number and serial number Battery box cover fixing screw ...

Page 14: ...eneral purpose type sensor cable length 0 75m General purpose type sensor cable length 3m General purpose type sensor cable length 0 75m Chemical resistant type sensor cable length 0 75m Chemical resistant type sensor cable length 0 75m Sensor for high conductivity measurement cable length 0 75m Sensor for high conductivity measurement cable length 0 75m Always AA SC72SN Type 11 19 21 23 29 31 39 ...

Page 15: ...ering connector and causing leakage between pins Connects sensor cable to conductivity meter Plastic body can withstand temperatures up to 808C SC72 11 AA 1 1 1 SC72 21 AA SC72 23 AA SC72SN 11 AA 1 SC72SN 21 AA SC72SN 23 AA Chemical resistant sensor Inner electrode platinum black Air vent Sensor body glass Inner electrode platinum black Air vent Sensor body glass Sensor cable Watertight cover Conn...

Page 16: ...aCl Standard solution Part no K9221ZA 0 1mol L NaCl solution for calibration 250mL F010701 ai 1 8 Spare Parts 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 O ring Gasket Replacement for replacement O ring and gasket set Part no K9654AY 2 gaskets for battery box 2 O rings for connector F01080...

Page 17: ...IM 12D03D02 01E 1 10 1 Outline ...

Page 18: ... 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 screw holding the battery box cover using a coin or similar object 2 Remove the battery box cover and then install the batteries observing polarity diagram inside 3 Make sure the gasket on the inside rim of the battery box is free of foreign materia...

Page 19: ... the connector on the meter 3 Move the waterproof cover toward the connector until it contacts with the O ring on the meter body Make sure that the O ring is free of foreign material 4 Push and rotate the waterproof cover 1 4 turn 90 degrees clockwise to lock into place Locknut Silver Waterproof cover 1 2 4 3 Note It is recommended that the sensor be kept connected to the meter to avoid contaminat...

Page 20: ...e before completing the meter will beep three times and reject the attempt Continue until the minute setting is completed key for at least 1 sec After pressing to set to confirm to set to set to confirm to confirm to set to confirm Year setting Day setting Hour setting 24 hour format Month setting Minute setting After several seconds After several seconds POWER F ENT F ENT F ENT F ENT to set to co...

Page 21: ... are stored in non volatile memory and are not lost even when the batteries are replaced l Setting cell constants Press the F ENT key to switch to function mode Then select the C C display with the keys and access the cell constant setting display with the F ENT key Use the keys to set the cell constant then press the F ENT key to confirm it Refer to Sec 4 3 4 F ENT F ENT F ENT MEAS for Function m...

Page 22: ...rature 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 temperatu...

Page 23: ...ion coefficient For NaCl solutions Manual setting Set the temperature compensation coefficient with the keys MEAS MEAS F ENT F ENT F ENT F ENT F ENT The temperature coefficient you set is displayed here for Function mode for t Co panel select t Co select NaCl or C F ...

Page 24: ... 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 Maintenance When the meter...

Page 25: ...measurement error may occur Electrode element Figure 3 2 Dipping Sensor in Liquid for general purpose sensors 3 3 Measurement Display Panel When immersing the sensor in a sample solution a measured conductivity value will be shown on the display There are three types of measurement display panels the standard calendar and clock display panels Use MEAS key to cycle through these display panels Stan...

Page 26: ...rently 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 will be displayed If is displayed before the data number has reached 300 run defrag referring to Section 4 3 15 Defrag memory dFLG panel This will free up memory occupied ...

Page 27: ...IM 12D03D02 01E 3 4 3 Measurement ...

Page 28: ...witches to function mode Also used to enter set value If you press this key during measurement mark is displayed and present measured values are held To cancel press or keys If pressed during measurement mark flashes Press key to store measured values in memory To abort data storage and return to MEAS mode press or key again while mark is flashing MEAS MEAS F ENT HOLD DATA 4 1 Keypad Functions POW...

Page 29: ...ee measurement display panels refer to Section 3 2 Measurement Procedures Pressing this key in other modes will return the meter to measurement mode If you want to cancel any operation press this key to return to measurement mode Setting change keys Used to change settings F ENT Entry key Pressing this key during measurement moves the display to function mode refer to Section 4 3 Function Modes Th...

Page 30: ...en temperature compensation is being set refer to Section 4 3 2 Temperature compensation setting t Co panel 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 Section 4 3 3 Range selection rnG panel 4 Data save mode Appears when measured data are stored or when stored data ar...

Page 31: ... 6 Item 7 Item 8 Item 9 Item 10 Item 11 Item 12 Item 13 Item 14 Item 15 T0401 EPS 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 Item 1 dAt t Co rnG C C CAL dEL A dAtE tIME ALM A oFF bZ o SC U tP U VEr dFLG Description Display stored measurement value Temperature compensation settin...

Page 32: ...ata Numbering after Deletion The number displayed at the bottom left indicates the stored data number relative to the beginning of the data store This number does not necessarily represent the number of stored data If a data item is deleted item numbers of data that follow it will be decreased by one Data Display after Deletion If a data item is deleted the data item after it is displayed If there...

Page 33: ...th data was stored Time stored F ENT When no stored data F ENT F ENT F ENT F ENT DATA DATA DATA DATA DATA 2 Temperature compensation setting t Co panel This panel is used to change the temperature compensation type and temperature coefficient setting The mark appears on the panel Automatic temperature compensation for NaCl solution Press the keys to select NaCl Then press the F ENT key ...

Page 34: ...n press the F ENT key Use keys to select For NaCl When NaCl is displayed press key to confirm F ENT F ENT For manual setting When C or F is displayed set the temperature coefficient with keys Press key to complete the temperature coefficient setting F ENT F ENT 3 Range selection rnG panel Change the current measuring range Use the keys to change between autoranging and fixed range For fixed range ...

Page 35: ...ement SC72 41 Autorange Fixed range 4 0 2 000mS cm Fixed range 3 0 20 00mS cm Fixed range 2 0 200 0mS cm Fixed range 1 0 2 000S cm With sensor for high purity water measurement SC72 11 Autorange Fixed range 4 0 40 0MΩcm Fixed range 3 0 2 000µS cm Fixed range 2 0 20 00µS cm Fixed range 1 0 200 0µS cm F ENT Set range 1 fixed F ENT 1 1 1 1 1 Refer to Relationships between automatic and fixed ranges a...

Page 36: ...ation procedure In CAL mode the mark appears at the top of the panel and all digits of the present measurement value flash After the measurement stabilizes press the F ENT key to display the measured value at that time Only the least significant digit flashes Use the keys to set the desired calibration value then press the F ENT key to complete the calibration The meter internal cell constant is c...

Page 37: ...ENT to execute delete all F ENT 7 Date setting dAtE panel Used to set the year four digits month and day in this order Use keys to set the year month and day and press F ENT key to confirm each entry Year setting Month setting Day setting F ENT F ENT F ENT F ENT The calendar function will be valid through to year 2090 8 Time setting tIME panel Used to set the time hour 24 hour format and minute in...

Page 38: ...ds Use keys to select the desired alarm cycle 7 days everyday 5 days weekdays or once See Item 8 Time setting tIME panel for setting the time for alarm The alarm sounds for about 15 seconds Acknowledge the alarm by pressing any key The alarm sound will stop If no key is pressed no acknowledgement the alarm sounds for 15 seconds again 3 and 6 minutes after the preset alarm time Note that the day of...

Page 39: ...s once at preset time F ENT F ENT F ENT 10 Set Auto Power Off time A oFF panel Used to set the automatic power off time The meter turns off power automatically if no key is pressed during this preset time The time range is from 1 to 120 minutes If 0 is set the Auto Power Off function will be disabled Use the meter taking care to conserve the batteries F ENT Use key to set to confirm F ENT ...

Page 40: ...m 9 F ENT to turn ON enable F ENT to turn OFF disable F ENT 12 Set measurement unit SC U panel Toggle the measurement value units between S cm and S m Use the keys to toggle the measurement value units Then press the F ENT key to complete setting to toggle F ENT to set F ENT 13 Set temperature unit tP U panel Used to select the temperature unit Celsius C or Fahrenheit F Use keys to select the desi...

Page 41: ...ction to consolidate data and free up the space occupied by deleted data thereby allowing up to 300 data to be stored While memory defrag is in progress do NOT turn off the power In addition before starting memory defrag check that there is enough battery life left to avoid battery shutoff during memory defrag Procedure Press F ENT key on the flashing dFLG display will be flashing Use keys to sele...

Page 42: ...ctrode cell constant Setting temperature coefficient 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 Measurement Select one of the three conductivity measurement ranges 0 to 200µS cm 0 to 200mS cm or 0 to 2S cm corresponding to the type of electrode used Temperature measuring range ...

Page 43: ... 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 titani...

Page 44: ...n clean the connector with a dry cloth or a cloth moistened with anhydrous alcohol If necessary use a dryer Wipe off stains and or moisture on meter connector with a dry cloth Check that there are no stains on the O ring O ring Hot air Use a hair drier if necessary to remove moisture from connector of sensor cable CAUTION Use anhydrous alcohol to clean the connectors so no moisture remains Dry con...

Page 45: ...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 wa...

Page 46: ...rating the meter with standard solution 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 ...

Page 47: ...ue is flashing Select CAL mode POWER F ENT F ENT F ENT F ENT Std sol Water Wash sensor with water completely Wait until the measured value is stable Set the conductivity of the standard solution Thoroughly wipe off the washing water from the electrodes before immersing the sensor in standard solution Refer to Section 4 3 Function Modes for temperature coefficient and cell constant settings ...

Page 48: ...torage Location When not in use store the meter and sensor in a safe place If it is to be stored for a long period store it in a place With low humidity at or near normal temperatures Not exposed to direct sunlight or water No corrosive gases are present l Replacing the O ring and Gasket A gasket in the battery box and an O ring on the sensor connector of the meter can be replaced Heavily contamin...

Page 49: ...aintenance 2 Replacing the Gasket Install the gasket on the groove on the battery box so the raised part fits in place as shown below The gasket is symmetrical right to left and front to back Gasket Raised part SC72 meter top ...

Page 50: ... it contact your nearest Yokogawa sales office Abnormal Components need replacement Displayed value unstable Displayed value unrealistic Error message displayed Battery Needs maintenance Needs recalibration with standard solution Electrode stained Electrical leakage in connector SC meter failure Contact Yokogawa Figure 6 1 Causes of abnormality 6 2 Error Messages and Corrective Action Table 6 1 Er...

Page 51: ...ement range Possible Causes This error occurs if the measurement liquid temperature is outside the range 10 to 120 C or if sensor cables are disconnected Note The liquid temperature should never be outside the range 0 to 80 C Corrective Actions Set the liquid temperature to 0 to 80 C Replace the sensor Refer to Sec 1 6 3 Err3Calibration error Possible Causes When the calibration with standard solu...

Page 52: ... Value If 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 sensor damaged or dirty 6 4 Other Conditions An alarm sounds The alarm is set to sound at the preset alarm time Refer to Section 4 3 9 Alarm time ...

Page 53: ...IM 12D03D02 01E 6 4 6 Troubleshooting ...

Page 54: ...procal of the resistance between two sensors both of areas 1 m2 at a distance of 1 m apart in the solution 1 S cm 100 S m Figure 7 1 shows the conductivities of typical solutions Pure water Sea water Deionized water Distilled water Reservoir water Strong acid and alkali solutions Salt water 1 to 27 Organic acid 0 1 1 10 100 1000 µS cm 0 01 0 1 1 10 100 mS m 1 10 100 1000 mS cm 0 1 1 10 100 S m Fig...

Page 55: ...2 1 K where J constant also called cell constant determined by sensor and distance between two sensors From equations 1 and 2 above we obtain K I 3 J E E and J are constant so the conductivity K can be obtained by measuring the current I 7 3 Temperature Compensation and Finding Temperature Compensation Coefficient Temperature Compensation Table 7 1 shows the conductivity ratio at each liquid tempe...

Page 56: ...tion 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 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 e...

Page 57: ...as 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 7 4 Wetted Part Materials of Sensors For general purpose sensor Titanium sensor Polyphenylene sulfite resin Polypropylene resin insulated area and cover Fluoro rubber O ring Sensor for h...

Page 58: ...ens are shown Refer to the corresponding section in the body of the manual for details F01 ai POWER F ENT F ENT F ENT F ENT F ENT When turn on power First time used or after replace batteries MEAS MEAS MEAS Toggle display type or HOLD HOLD MEAS Temporary hold F ENT MEAS DATA DATA Storing data ...

Page 59: ...3D02 01E App 2 Appendix F ENT F02 ai F ENT F ENT DATA DATA DATA DATA F ENT Function Mode or Display stored measurement value F ENT F ENT F ENT F ENT Temperature compensation setting F ENT F ENT Range selection ...

Page 60: ...etting F ENT F ENT F ENT Calibration with standard solution F ENT F ENT Delete all stored measurement data F ENT F ENT F ENT F ENT Date setting F ENT F ENT F ENT Time setting Switching to Function Mode Reverting to Measurement Mode Measurement status Measurement status F ENT MEAS ...

Page 61: ...nction Mode Function Mode Alarm time setting F ENT F ENT Set Auto Power OFF interval F ENT F ENT Set buzzer ON OFF F ENT F ENT Set measurement unit F ENT F ENT Set temperature unit F ENT Version number display F ENT F ENT F04 ai Deflagment storaged data ...

Page 62: ...ccessories deletion of optional accessories revi sion of specifications RoHS conformity standards etc full review 3rd Aug 2009 Change of information on EMC compliance P 1 3 2nd Apr 2008 Addition of information on EMC compliance P 1 3 Addition of CAUTION P2 2 Correction P 1 1 2 1 6 2 1 2 3 3 1 3 3 4 1 4 5 App 1 App 4 1st Aug 2004 Newly published ...

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