Single Range DS Meters
Contents
1. WILL NOT be accurate DO NOT splash solvents such as lacquer thinner acetone benzene or chlorinated solvents on the plastic case DO NOT fix or modify the meter That will void your warranty See SERVICE for details or consult Myron L Company DO NOT DIP THE INSTRUMENT INTO WATER If water does get inside the instrument see MAINTENANCE for instructions on drying it 71 C The readings Internal S Standard Button Battery Strap Lower Electrode inside cell Calibration Control CALIBRATION STANDARD SOLUTIONS A Standard Solution has a known conductivity and ppm value Your meter was calibrated at the factory using Myron L Company 442 1000 Standard Solution You can keep your meter accurate by using this same Standard Solution see ACCESSORIES How often you calibrate your meter depends on how much you use it For once a day use recalibrate it every three months CHECKING CALIBRATION 1 Test a sample of Myron L 442 1000 Standard Solution CAUTION Throw the Standard Solution away as you use it Don t put the used samples back in the bottle 2 Ifthe Meter does not indicate the 1000 ppm value on the Standard Solution bottle s label first clean the cell For directions on how to do this see CELL CUP inside Rinse the cell thoroughly and test the Standard Solution again If the Meter still does not indicate the correct value recalibrate it as described below TO RECALIBRATE THE METER 1 Remove the bottom cov2. ANDARD value NOTE lf the meter will not adjust to the INTERNAL STANDARD value the battery should be replaced See MAINTENANCE above right 3 Replace the bottom cover CONVERSION CHART 3920 mhos 1000 ppm 1414umhos Micromhos Microsiemens Conductivity 500 ppm 733u mhos 0 500 1000 1500 2000 2500 3000 Parts Per Million TDS MAINTENANCE BATTERY CHECK Press the internal S button If the pointer does not reach the INTERNAL STANDARD value readjust the S see FIELD CALIBRATION If the pointer will not reach the INTERNAL STANDARD value the battery should be replaced BATTERY REPLACEMENT Detach the battery connector Pull on the plastic strap to remove the battery Replace with a fresh zinc carbon or alkaline 9 volt battery Reinsert the plastic strap to secure battery Replace the bottom cover CELL CUP Self conditioning of the built in electrodes occurs each time the button is pressed with a sample in the cell cup This ensures consistent results each time With some samples a small downward swing of the pointer is a result of this conditioning action This action is powerful and removes normal films of oil and dirt However if very dirty samples particularly scaling types are allowed to dry in the cell cup a film will build up This film reduces accuracy When there are visible films of oil dirt or scale in the cell cup or on the electrode scrub them lightly with a small brush and household cle
3. SINGLE RANGE DS METERS Operation Instructions User Manual for Models RO 1 RO 1NC DS 1 2 2450 Impala Drive Carlsbad CA 92010 7226 USA Tel 760 438 2021 Fax 800 869 7668 760 931 9189 pri Conductivity Instrumentation www myronl com acy Reliability Simplicity MYRON L COMPANY DESCRIPTION This manual describes your Myron L RO 1 series DS meter tells you how to use it and how to keep it working accurately for many years Your single range DS Meter is a compact instrument which operates on the principle of electrical conductivity It will quickly determine the ppm Total Dissolved Solids of almost any solution by converting the conductivity directly into parts per million ppm of Total Dissolved Solids All DS Meters are 3 4 x 4 5 x 4 0 85 x 129 x 126mm weigh less than one pound 0 45 kg and are completely self contained The built in cell is automatically temperature compensated from 50 to 160 F 10 to 71 C They are powered by a 9 volt transistor battery good for at least 2000 tests or one year shelf life MODEL NO RANGE DIAL COLOR BANDS RO 1 0 1250 ppm 0 250 Blue 250 500 Orange 500 1250 Red RO INC 0 1250 ppm DS 1 0 1250 ppm Your meter has a useful and unique feature an electronic Internal Standard for easy field calibration The pictures in this manual show the major operating parts of your Myron L DS Meter Handle your Meter and identify these parts to become familiar with it Model RO 1
4. anser Rinse out the cleanser and the meter is ready for accurate measurements WATER INSIDE THE METER Your Myron L meter is a rugged instrument and will withstand water exposure around its cell meter movement and switches However care should be taken to keep water from leaking in around the bottom cover It is not sealed to prevent condensation from forming lf the water is relatively clean i e tap water or better and there are only a few drops inside the meter dry it as described below Large amounts of water or corrosive or very dirty solutions will almost certainly damage the meter movement or electronics Such meters should be returned to the Myron L Company for repair To dry your meter 1 Shake excess water out of the inside of the meter 2 Dab the exposed surfaces dry with an absorbent cloth or tissue Avoid pushing any water into the Calibration Control or either of the switches 3 Air dry the meter in a warm area with the bottom cover off Allow several hours for thorough drying If the water entered through a leak in the case or cell or if the instrument shows erratic readings or other unusual behavior return it to the Myron L Company for servicing ACCESSORIES STANDARD SOLUTIONS Your RO series meter has been factory calibrated with the appropriate Myron L Standard Solution 442 1000 The 442 Standard Solutions consist of the following salt ratios 40 sodium sulfate 40 sodium bicarbonate and 20 sod
5. er using fingernails or a small screwdriver to loosen the front or rear edge Identify the Calibration Control and S button see photo below left so you can find them by touch while calibrating 2 Test another sample of the Standard Solution be careful to not splash solution inside the meter 3 Adjust the Calibration Control until the meter indicates the 1000 ppm value on the Standard Solution label 4 Press the internal S button Compare the meter reading to the INTERNAL STANDARD value on the meter s bottom label If they are noticeably different mark the new value in place of the old one NOTE The feature described below is intended as a quick field calibration check It is not a replacement for calibration with Myron L 442 1000 Standard Solution INTERNAL STANDARD An INTERNAL STANDARD value for each meter is on the label on the bottom cover of each meter Use it between normal calibrations as a field check of your meter s accuracy To verify your meter s calibration 1 Press the internal S button 2 Ifthe reading matches the INTERNAL STANDARD value on the bottom label your meter is in calibration If not see FIELD CALIBRATION Model RO 1NC Model RO 1 FIELD CALIBRATION MAINTENANCE 1 Remove the bottom cover using fingernails or a small screwdriver to loosen the front or rear edge 2 Press the internal S button and adjust the Calibration Control until the meter reading is the same as the INTERNAL ST
6. ium chloride This salt ratio has conductivity characteristics approximating fresh natural waters and was developed by the Myron L Company over three decades ago It is used around the world for measuring both conductivity and TDS in drinking water ground water lakes streams etc The 1000 ppm 1417uS is the recommended standard Order 442 1000 All Myron L Company Standard Solutions are NIST Traceable and are within 1 0 of reference solutions The concentrations of the reference solutions are caiculated from data in the international Critical Tables Vol 6 RECOMMENDED STANDARD SOLUTIONS MODEL PARTS PERMILLION SOLUTION RO 1 442 1000 RO 1NC 442 1000 DS 1 442 1000 PORTA PAK Carrying Case for use with all Myron L DS and pDS meters is foam lined and molded of sturdy ABS plastic ORDERING To order accessories contact your nearest stocking distributor or the Myron L Company MYRON L COMPANY Printed in U S A pH Conductivity Instrumentation Accuracy Reliability e Simplicity WARRANTY SERVICE Myron L RO and DS Meters have a limited one year warranty If your instrument fails to operate properly check the batteries and calibration If it still fails to function properly return it prepaid to the Myron L Company Faulty instruments may be returned to us without prior permission METERS WITHIN ONE YEAR WARRANTY PERIOD Failures due to materials or workmanship will be repaired or replaced our option
7. shown Cell Cup Upper Electrode A Meter Zero gt Adjust Pointer Button USING YOUR METER 1 Rinse the cell cup three times with the sample you want to test For very hot or very cold samples see TEMPERATURE COMPENSATION below NEVER FILL THE CELL BY DIPPING THE METER INTO WATER 2 Fill the cell with another sample to at least s 6mm above the upper electrode 3 Press the black button 4 Read the dial value indicated by the pointer to determine parts per million ppm Total Dissolved Solids 5 Ifthe pointer goes off the scale to the right try diluting your sample so it can be measured A Pour distilled or deionized water into a separate container until it is exactly half full B Complete the filling of the container with your sample C Test the diluted sample in the normal way described above D Multiply by 2 the ppm value indicated on the dial For Example Asample reading 900 after dilution would actually havea TDS value of 1800 ppm NOTE When you are finished with the meter RINSE THE CELL CUP with clean water preferably distilled or deionized TEMPERATURE COMPENSATION For very hot or very cold solutions let the three rinse samples each remain in the cell for several seconds then immediately fill the cell with the sample you want to test step 2 at left This allows the automatic temperature compensation feature time to work properly CAUTION DO NOT use with samples hotter than 160 F
8. without charge if returned freight prepaid If failure is deemed by the factory to have been caused by abuse or tampering the following procedure will apply INSTRUMENTS CONTROLS OUT OF WARRANTY Diagnosis will be made and repairs completed providing the repair charges are 70 00 or less NOTE Actual repair charges may be less than this amount We will diagnose but not repair a returned meter and mail an estimate of charges if ANY of the following apply 1 Repair charges will be more than 70 00 2 You specifically request an estimate of required repairs and charges 3 The cost of required repairs exceeds one half the list price of a new instrument 4 The instrument is over ten years old Because of component changes and improvements such instruments can no longer be repaired NOTE Unrepaired meters are discarded unless you want them returned to you If so there is currently a 25 00 charge per unrepaired instrument to cover diagnosis and handling This warranty is limited to the repair or replacement of the Myron L RO or DS Meter only The Myron L Company assumes no other responsibility or liability 2450 Impala Drive Carlsbad CA 92010 7226 USA Tel 760 438 2021 Fax 800 869 7668 760 931 9189 www myronl com Myron L Company 2001 W
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