Conductivity pDS Manual
Contents
1. off the scale to the right on the x1000 range use an RE 10 range extender see ACCESSORIES CONDUCTIVITY MEASUREMENT Model M6 pH 1 Rinse and fill the cell cup as in steps 2 and 3 above 2 Press the black button 3 Read the conductivity value in micromhos microsiemens indicated by the pointer on the dial s black scale 4 Ifthe pointer goes off the scale to the right use an RE 10 range extender see ACCESSORIES NOTE When you are finished with the meter RINSE THE CELL CUP with clean water preferably distilled or deionized pH MEASUREMENT 1 Obtain sample to be tested if necessary heat or cool it to room temperature 2 Remove the pH compartment cap and sharply shake out any liquid 3 Pour or squirt the sample into the built in cell cup especially the small pH compartment Shake out and repeat three times with the sample to be tested These may be the same rinsings used to condition the cell for conductivity measurement 4 Press the red button The pointer immediately indicates the pH of the sample on the red scale If the pointer drifts wait approximately 30 seconds and press the button again to obtain a stable reading of pH If drifting continues the electrode may be coated with a film Use a liquid cleaner such as Windex or Fantastic to clean the pH sensor bulb see pH SENSOR 5 Rinse both pH and conductivity parts of the cell with clean water LEAVE SOME LIQUID IN THE pH COMPARTMENT AND RECAP TEMPERATU2. CONDUCTIVITY pDS METERS Operation Instructions User Manual for Models EP11 pH M6 pH24 2450 Impala Drive Carlsbad CA 92010 7226 USA Tel 760 438 2021 Fax 800 869 7668 760 931 9189 prU Conuenty revere www myronl com ccuracy Reliability Simplicity MYRON L DESCRIPTION This manual describes your Myron L pDS meter tells you how to use it and how to keep it working accurately for many years Myron L pDS Meters are compact light weight self contained conductivity oH meters They contain a built in conductivity cell with a replaceable pH sensor Models EP11 pH and M6 pH have dials calibrated in micromhos equivalent to the metric microsiemens and in pH units They will quickly determine the conductivity and pH of almost any solution Both are 3 4 x 4 5 x 4 0 85 x 129 x 126mm and weigh less than one pound 0 45 kg pDS Meters are completely self contained The built in conductivity cell is automatically temperature compensated from 50 to 160 F 10 to 71 C They are powered by two 9 volt transistor batteries good for at least 2000 tests or one year shelf life MODEL CONDUCTIVITY RANGES pH RANGE EP11 pH 0 10 0 100 0 1000 0 10 000 micromhos umhos 2 12 pH M6 pH 0 5000 micromhos umhos 2 12 pH ACCURACY Both Models Conductivity 2 of full scale pH 0 2 pH units REPEATABILITY Both Models 1 By using an RE 10 Range Extender see ACCESSORIES the maximum conductivity range of each meter may be
3. Extender with clean water preferably distilled or deionized to eliminate dried salts build up This is extremely important when the instrument will be used to test high purity water Ai RE 10 RANGE EXTENDER CALIBRATING THE RE 10 1 2 3 Calibrate your meter without RE 10 using Standard Solution number KCL 7000 EP1 1 pH or 442 3000 M6 pH Fill cell cup with 442 30 000 high conductivity Standard Solution Insert RE 10 and press the button Multiply the reading by 10 and compare it with the value on the Standard Solution label If they are not the same the RE 10 must be recalibrated NOTE DO NOT adjust the Conductivity Calibrated Control 4 Adjust the white insert of the Extender as follows If the reading is too high push or tap inward If reading is too low twist or pull outward with pliers NOTE The Range Extender is factory calibrated to a particular meter It should be recalibrated if it is to be used with another meter REPLACEMENT pH SENSORS Order Model RPY for either EP11 pH or M6 pH meters When ordering be sure to include the model and serial number of your meter to ensure receiving the proper type Complete installation instructions are provided with each replacement sensor 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 Myro
4. RE 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 3 above This allows the automatic temperature compensation feature time to work properly CAUTION ALWAYS store your pH sensor wet and with the cap on ALWAYS rinse the cell cup with pure water immediately after use or cleaning This will prevent the build up of unwanted deposits and possible contamination of the sample DO NOT test solutions which could damage the pH sensor See MAINTENANCE DO NOT use with samples hotter than 160 F 71 C The readings 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 CONDUCTIVITY CALIBRATION CONDUCTIVITY STANDARD SOLUTIONS A Standard Solution has a known conductivity and ppm Your meter was calibrated at the factory using NIST Standard Solutions You can keep your meter accurate by using the same NIST Standard Solutions To pick the right Myron L Company Standard Solution for your meter see ACCESSORIES How often you calibrate your meter depends on how much you use it For o
5. SORIES DuPont Company 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 waiter out of the inside of the meter 2 Dab the exposed surface dry with an absorbent cloth or tissue Avoid pushing any water into the Calibration Controls or 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 CONDUCTIVITY STANDARD SOLUTIONS Your pDS Meter has been factory calibrated with the appropriate NIST traceable Standard Solutions All Myron L Company Conductivity Standard Solutions are traceable to the National Institute of Standards and Technology and are within 1 0 of Potassium Chl
6. are visible films of oil dirt or scale in the cell cup or on the electrodes scrub them lightly with a small brush and household cleanser Rinse out the cleanser and the meter is ready for accurate measurements pH SENSOR The unique pH electrode in your pDS meter is a nonrefillable combination type which features a porous Teflon liquid junction covered by U S Patent No 4128468 It should never be allowed to dry out See pH MEASUREMENT If it does the sensor can sometimes be renewed by soaking in a saturated potassium chloride KCI solution for several days Drifting can be caused by a film on the sensor bulb Use a liquid cleaner such as Windex or Fantastic to clean it The sensor bulb is very thin and delicate Excessive pressure during cleaning may break it Leaving high pH alkaline solutions in contact with the pH sensor for long periods of time can damage it Rinsing such liquids from the pH compartment and moistening it with 4 buffer or tap water will extend its useful life Samples containing chlorine sulphur or ammonia can poison any pH electrode If it is necessary to measure the pH of any such sample thoroughly rinse the pH sensor with clean water immediately after taking the measurement Any sample element which will reduce add an electron to silver such as cyanide will attack the reference electrode Replacement sensors are available only from the Myron L Company or our authorized distributors see ACCES
7. increased ten times The pictures in this manual show the major operating parts of your Myron L DS Meter Handle your DS Meter and identify these parts to become familiar with it IMPORTANT The pH sensor in your pDS Meter has a limited life much like a battery Sensor longevity is affected both by the types of solution tested and care given your meter pH sensors are user replaceable See MAINTENANCE for additional information Model EP11 pH shown Polyethylene Cell Cup N pH Compartment Upper Conductivity Electrode Meter Zero Adjust Battery Indicator Black Conductivity Button Conductivity Range Selector Switch Red pH Button USING YOUR METER CONDUCTIVITY MEASUREMENT Model EP11 pH 1 Turn the Range Switch to the desired range If you don t know which range to use set it to 1000 2 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 3 Fill the cell with another sample to at least 6 mm above the upper electrode 4 Press the black button 5 Read the dial s black scale value indicated by the pointer If the pointer is very low on the left or goes off the scale to the right try the next lower or higher range 6 Multiply the dial s black scale value by the range setting to determine conductivity in micromhos microsiemens 7 lf the pointer goes
8. n L Company MYRON L COMPANY Printed in U S A pH Conductivity Instrumentation Accuracy Reliability Simplicity Specifications subject to change without notice WARRANTY amp SERVICE Myron L pDS meters excluding the pH sensor have a two year warranty The pH sensor has a 6 month limited warranty If an instrument fails to operate properly check the batteries calibrations and cleanliness of the pH sensor bulb If it still fails to properly function return it prepaid to the Myron L Company If in the opinion of the factory failure was due to materials or workmanship repair or replacement will be made without charge A reasonable service charge will be made for diagnosis or repairs due to normal wear abuse or tampering This warranty is limited tothe repair or replacement of the Myron L pDS 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
9. nce a day use recalibrate it every three months CHECKING CONDUCTIVITY CALIBRATION 1 Turn the Range Switch to the x1000 range EP11 pH only 2 Test a sample of appropriate Standard Solution CAUTION Throw away the Standard Solution as you use it Don t put the used samples back in the bottle 3 If the pDS Meter does not indicate the same value as is 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 pDS Meter still does not indicate the correct value recalibrate it as described below TO RECALIBRATE CONDUCTIVITY 1 Remove the bottom cover using fingernails or a small screwdriver to loosen the front or rear edge Identify the Conductivity Calibration Control see photo below so you can find it by touch while calibrating 2 Test another sample of the Standard Solution be careful to not splash solution inside the meter 3 Adjust the Conductivity Calibration Control until the meter indicates the value that is on the Standard Solution label Model EP11 pH shown pH Sensor Lower Conductivity Electrode inside cell Battery Strap H Gain 4 amp 10 Buffers pH Zero arene 4 Buffer Conductivi Calibration pH CALIBRATION MAINTENANCE pH STANDARD BUFFER SOLUTIONS All pH sensors drift and decrease in strength as they age pH meters have two Calibration Controls to c
10. ompensate for those effects ZERO adjust corrects for drift of the pH sensor s response to neutral pH solutions GAIN adjust amplifies the signal from the pH sensor for accurate readings of other pH values Use pH standard buffer solutions to calibrate all pDS meters The recommended values are 4 7 and 10 For greatest accuracy adjust with the buffer closest in pH to the samples to be tested pH ZERO ADJUST Frequency weekly Test by rinsing and refilling the cell with 7 buffer and pressing the red button The meter should indicate 7 on the red scale If it is necessary to calibrate Zero perform the following steps 1 Remove the bottom cover using fingernails or a small screwdriver to loosen the front or rear edge 2 Refill cell with 7 buffer see pH MEASUREMENT for proper procedure 3 Press the red button and turn the pH Zero control until the needle indicates 7 4 Recap the pH compartment and replace the bottom cover pH GAIN SLOPE ADJUST Frequency bi monthly The Gain should be calibrated approximately once every eight weeks The Gain Control is used with 4 and 10 buffers NOTE Never adjust the Gain control without first adjusting Zero Test by rinsing and refilling the cell with 4 or 10 buffer and pressing the red button The meter should indicate the buffer value on the red scale If it is necessary to calibrate the Gain perform the following steps 1 Remove the bottom cover 2 Rinse and fill the pH compartmen
11. oride reference solutions The concentrations of the reference solutions are calculated from data in the International Critical Tables Vol 6 pH STANDARD BUFFER SOLUTIONS Ready to use Myron L Company pH buffer solutions are mold inhibited and accurate to within 0 06 pH units 25 C They are traceable to National Bureau of Standards certified pH references and are color coded for instant identification RECOMMENDED STANDARD SOLUTIONS MODEL RANGE SOLUTION NUMBER EP11 pH CONDUCTIVITY X10 KCI 70 X100 KCI 700 X1000 KCI 7000 with RE 10 442 30 000 pH ZERO 7 buffer pH GAIN 10 buffer M6 pH CONDUCTIVITY 442 3000 with RE 10 442 30 000 pH ZERO 7 buffer pH GAIN 4 buffer 10 buffer RANGE EXTENDER The RE 10 Range Extender is a useful accessory for testing high conductivity solutions beyond the normal range of your pDS meter Inserting the RE 10 into a sample filled cell cup increases the maximum range ten times Use the Range Extender whenever the reading is off the scale USING THE RE 10 1 Fill the cell cup three times to rinse it but each time insert the Range Extender to rinse it also 2 Fill the cell cup with your sample Push the Range Extender into the cell cup seating the O ring seal 3 Use and read the DS Meter in the normal manner Multiply the reading by 10 For best accuracy repeat the complete test with a fresh sample When you re done testing remove the Range Extender Thoroughly rinse the cell cup and
12. t with 4 buffer and press the red button Adjust the Gain control until the needle indicates 4 3 Rinse three times and test with 10 buffer If adjustment is necessary adjust to only half way between the initial reading and 10 If after this the 4 and 10 buffer readings are not less than one division from 4 and 10 the sensor is deteriorating and should be replaced The sensor should also be replaced if the Gain control cannot make the pointer reach either 4 or 10 MAINTENANCE BATTERY CHECK Models EP11 pH and M6 pH have a battery indicator glow light visible through the small hole on the lower right hand corner of the meter face plate If this light fails to glow when the black button is pressed replace both batteries BATTERY REPLACEMENT To replace the batteries detach the battery connectors Pull on the plastic straps to remove the batteries Replace with fresh zinc carbon or alkaline 9 volt batteries Reinsert the plastic straps to secure batteries 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
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