MODEL 470 PORTABLE CONDUCTIVITY/TDS METER
Contents
1. Recheck Deselect Hold function Reselect mode Allow to soak for 2 hours Noticeable for low conductivity do not allow sample to stand in unstoppered bottles FAULT PROBABLE CAUSE ACTION Non linear readings Conductivity cell not zeroed Zero conductivity cell Poor reproducibility Carryover between solutions Rinse cell in distilled water between measurements BATTERY REPLACEMENT To fit new batteries loosen the battery compartment cover the screws are captive in the cover remove and carefully discard the used batteries Fit the new batteries type R6 AA or AM3 ensuring the correct polarities are observed as indicated on the moulding Refit the battery compartment cover ensuring that the fixings are secured into place but are not overtightened OPTIONAL ACCESSORIES The following list of items are available for use with the Model 470 033 269 Carrying Case 985 531 Protective Boot 025 139 Conductivity Standard 10uS 025 164 Conductivity Standard 84uS 025 138 Conductivity Standard 1413uS 025 156 Conductivity Standard 12 88mS 027 298 Cell K 1 epoxy bodied 027 801 Cell K 0 1 epoxy bodied 027 802 Cell K 10 epoxy bodied ll EC Declaration of Conformity JENWAY Model 470 Conductivity TDS Meter complies with the following European Standards EN 50081 1 1992 Electromagnetic compatibility Generic emission standard EN 61326 1998 Electrical equipment for measurement control and laboratory use EMC requirements2. EN 61010 1 1993 Safety requirements for electrical equipment for measurement control and laboratory use Following the provision of EMC Directive 89 336 EEC and Low Voltage Directive 73 23 EEC Martyn J Fall Managing Director Jenway Limited Gransmore Green Felsted Dunmow Essex CM63LB England 12
3. Standard 84uS 025 164 5 Conductivity Standard 14134 sS 025 138 6 Conductivity Standard 12 88mS 025 156 7 Cell K 1 epoxy bodied 027 298 8 Cell K 0 1 epoxy bodied 027 801 9 Cell K 10 epoxy bodied 027 802 DISPLAYS A or E Ql 4B B B P Qe Tc MD ists 2 23 ABBE E M 1 Main display 3 2 digit backlit LCD providing direct readout of conductivity in uS or mS and total dissolved solids TDS in mg l or g l The display will also show Underrange 1 and Overrange 1 symbols if the instrument is reading outside the operating ranges 2 Secondary display 4 digit display showing temperature manual temperature compensation value or probe temperature in C or F the cell constant value K or the temperature coefficient value as a percentage 6 3 Reading hold indication 4 CAL will be displayed momentarily to indicate auto standard recognition calibration or probe zero 5 Battery life indication 4 levels will be shown ranging from lt 25 25 50 50 75 and 75 100 Sensor calibration data and user parameters are retained during battery replacement 6 Modeannunciators 7 Manual temperature compensation calibration indication 8 OR annunciator indicates an out of range condition 3 CONTROLS Hold Cal Mode The main operating mode displays conductivity readings and temperature which can be held by pressing the Hold key subsequent Hold key press returns
4. prior to commencing a calibration sequence If the displayed reading is altered theauto standard recognition feature will be disabled To retrieve the auto standard recognition values it is necessary to exit the calibration sequence by pressing the Mode key a WITH KNOWN CELL CONSTANT Connect a standard pre calibrated cell n to the unit Select K using the Mode t j G B key The display will show the current ll tant t cell constan RE n The 4 v keys can then be used to adjust the cell constant to the value indicated on the conductivity cell body b ON STANDARDSOLUTION Auto Value Regognition Place the conductivity cell into the calibration standard Press the Cal key and allow the reading to stabilise prior to pressing the Cal key again to complete the calibration To abort the calibration sequence press the Mode key c ONNON STANDARD SOLUTION Manual Value Entry Place the conductivity cell into the calibration standard Enter the preferred calibration standard value using the a w keys If the displayed reading is altered the auto standard recognition feature will be disabled To retrieve the auto standard recognition values it is necessary to exit the calibration sequence by pressing the Mode key Press the Cal key and allow the reading to stabilise Press the Cal key again to complete the calibration To abort the calibration sequence press the Mode key SAMPLE MEASUREMENT Conductivity is a temperature dependent m
5. to live measurement Switches the instrument on and off The instrument will automatically switch off after 30 minutes if no keys are pressed Back light Pressing this key will illuminate the back light for 10 seconds It should be noted that if used excessively this will degrade battery life Enables adjustment of conductivity cell constant and temperature coefficient values Pressing the Cal key illuminates the Cal mode indicator A subsequent Cal key press calibrates to the nearest conductivity standard or probe offset to zero if the reading is less than 2uS Alternatively the 4 w keys can be used to set the conductivity display to the required value which must be confirmed by pressing the Cal key The Cal key is used to perform a conductivity calibration on 10uS 1413us 12 88mS or Ou S In TDS mode the unit calibrates to 6 6mg 1 933mg I 8 5g 1 or Omgl Calibration errors are indicated for 3 seconds by an error code displayed on the secondary display together with the parameter in error displayed on the primary display C or F temperature units can be selected by pressing the mode key for 3 seconds Pressing the Mode key changes to TDS measurement and temperature display Subsequent mode key presses will go through TDS and cell constant display adjustable via 4 V keys and TDS and temperature coefficient display adjustable via a w keys PROBE ZERO Pressing the Cal key illuminates the Cal mode indicator A subsequ
6. MODEL 470 PORTABLE CONDUCTIVITY TDS METER OPERATING MANUAL MANUEL D UTILISATION BETRIEBSHANDBUCH MANUALE OPERATIVO MANUAL DE OPERA O MANUAL DE FUNCIONAMIENTO 470 250 REV A 09 00 MODEL 470 PORTABLE CONDUCTIVITY TDS METER OPERATING MANUAL CONTENTS Introduction Specification Installation Displays Controls Probe Zero Preparation of Conductivity Standards Operation Calibration With Known Cell Constant On Standard Solution AVE On Non Standard Solution MVE Sample Measurement Error Codes Good Practice Guidelines Troubleshooting Guide 10 11 Battery Replacement 11 Optional Accessories 11 EC Declaration of Conformity 12 1 N 90 40 O0 O0 tA tn tA RO N29 6 oo No MODEL 470 PORTABLE CONDUCTIVITY TDS METER OPERATING MANUAL INTRODUCTION The Model 470 is a general purpose hand held Conductivity TDS meter offering direct calibration on standard solutions or by direct cell constant entry The custom backlit liquid crystal display simultaneously shows temperature compensated conductivity or TDS and temperature The conductivity TDS range is automatically selected for optimum resolution and temperature compensated using an adjustable temperature coefficient The instrument is housed in a robust ergonomically designed case that is environmentally protected to IP67 Calibration errors are clearly indicated together with the parameter in error An indication of battery life is also permanently shown on the
7. at the major constituent responsible for the conductivity of the solution is sodium chloride If significant quantities of other conductive species are present then the displayed results could be inaccurate Likewise the TDS mode assumes some knowledge of the electrolyte balance of the analyte The EC ratio parameter found in the set up routine allows selection of a factor suitable for the solution under test Most analysers which do not offer this option use a default value of 0 6 9 TROUBLESHOOTING GUIDE FAULT No power Unstable display Display permanently under or over range Intermittent display I O switch not working Y keys not working Back light not on goes out Unable to adjust manualtemperature Reading drifts PROBABLE CAUSE Battery failure Battery polarity incorrect ACTION Replacebatteries Refit batteries Conductivity cell defective Replace conductivity cell Intermittent or no connection Check cell connection to instrument Conductivity cell defective Replace conductivity cell Contaminated solutions Replace solutions Conductivity cell not fitted Check connections correctly TO key not held down longenough Operating in incorrect mode 10 second time elapsed normalfunction Hold function selected Incorrect mode of operation Conductivity cell stored dry CO absorbtion by sample 10 Retry holding key for 2 seconds Refer to operation section of manual
8. d water the exterior body wiped and then stored dry NOTE When preparing the cell for storage the plate area must not be wiped dry When using a dry cell initial stability on re use may be impaired until the cell plates become re wetted GOOD PRACTICE GUIDELINES 1 The presence of particulate matter in the sample can lead to unstable and non reproducible results If necessary filter or allow the particles to settle prior to immersion Ensure no air bubbles are trapped in the measuring cell Gentle agitation of the cell should ensure that bubbles are purged The entire plate area must be immersed in the solution under test The slots in the side of the sensor should be below the surface It is advisable to clean the sensor if contamination is evident This should be approached in a progressive manner beginning with deionised water and progressing to other solvents or a soft air brush if the deposits persist The carbon plates can be damaged and should not come into contact with anything which is likely to abrade their surface The temperature coefficient is very dependent on the solution being measured and its concentration level The effect of temperature change on conductivity can be very significant and if the temperature coefficient is not known it is wise to measure all samples at the same temperature The TDS mode displays results which have been calculated from the measurement of conductivity The salinity mode assumes th
9. display An automatic switch off facility helps to conserve battery life SPECIFICATION Conductivity Ranges Oto 1999mS only with cell constant 25 Oto 199 9mS Oto 19 99mS Oto 1999uS Oto 199 9uS Oto 19 99uS Resolution ImS 0 1mS 0 01mS 14S 0 1uS 0 01uS Accuracy 0 5 2 digits TDS Ranges 0to1999g I only with cell constant gt 5 Oto 199 9g 1 Oto 19 99g 1 Oto 1999mg l Oto 199 9mg l Oto 19 99mg l Resolution 1g 1 0 1g 1 0 01g 1 1mg 1 0 1 mg 0 01 mg l Accuracy 0 5 2 digits Temperature Range Resolution Accuracy ATC amp Manual Ranges Cell Constant Reference Emperature Emperature Coefficient E C Ratio Auto StandardRecognition Battery Life Indication Probe Input Power Size Weight INSTALLATION 10 to 105 C 14 to 220 F 0 1 C 1 F 0 5 C 1 F Oto 100 C 32 to 212 F Digitally settable 0 01 to 19 99 25 C 0 00 to 4 00 C linear 0 6 10uS 84uS 1413uS or 12 88mS with manual override lt 25 25 50 50 7596 75 100 Mini DIN conductivity temperature 2 AA cells 175 0x 75 w x 35 d mm 250g Unpack the instrument and ensure the following items are present 1 Model 470 Conductivity Meter 470 201 2 Conductivity Temperature Probe epoxy bodied 027 298 3 2x AA alkaline batteries 021 007 Optionalaccessories which may have been ordered 1 Carrying Case 033 269 2 Protective boot 985 531 3 Conductivity Standard 10uS 025 139 4 Conductivity
10. easurement All substances have a conductivity coefficient which varies from 1 C to 3 C for most commonly occurring substances The temperature coefficient defaults to 296 C this being adequate for most routine determinations Conductivity readings varying with temperature may be due to the substances under test having a coefficient other than the typical value of 2 C To eliminate this variation it is necessary to maintain all samples at the reference temperature by use of a thermostatic water bath or equivalent Adjustment may be made by selecting n on the secondary display via the Mode key H d d 9 and then using the 4 w keys to the required value e HH HH After calibration the measurement of samples is carried out by immersing thecellinthe samples allowing the reading to stabilise and recording the result The cell should be rinsed in deionised water between each sample to avoid contamination shaken to remove internal droplets and the outside wiped prior to immersion in the next sample TDSmode Conductivity mode 1231 1469 est ee s D 4 7 lt On completion of sample measurement the cell should be thoroughly rinsed in deionised water ERROR CODES Err 1 indicates that the calculated cell constant K is out of range 0 01 to 19 99 STORAGE Short Term The cell should be immersed in deionised water to keep the plates in a wetted condition Long Term The cell should be thoroughly rinsed in deionise
11. ent Cal key press calibrates to the nearest conductivity standard or probe offset to zero if the reading is less than 2uS PREPARATION OF CONDUCTIVITY STANDARDS Suitable conductivity standards are available commercially or these can be made up as required from A R reagents with reference to the relevant physical tables Method for general purpose conductivity standard 1 Accurately weigh out 0 746 grammes of dried A R grade Potassium Chloride KCI 2 Dissolve in 1 litre of good quality deionised water This produces a 0 01N solution with a conductivity of 1413uS 25 C Storage This solution must be stored in a plastic container and the air space should be kept to an absolute minimum The shelf life of 1 week can be increased by storing below 4 C but where any doubt exists about the viability of stored solution a fresh batch should be prepared OPERATION Switch the instrument on by holding down the I O key for 1 2 seconds All display segments will be illuminated for approximately 2 seconds Remove the conductivity cell from the packaging and ensure it is in good condition not broken Connect the cell to the instrument CALIBRATION Auto standard recognition operates over the range of 0 to 100 C and will recognise 1OuS 84uS 14134S or 12 88mS Alternative values may be entered during the calibration sequence by using the 4 w keys to set the preferred values NOTE Manual temperature compensation should be entered
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