Ultrameter™ Operation Manual Model 4P MYRON L COMPANY 10 - 02 (WEB) EG
Instrument Illustration Conductivity Cell (Built-in Electrodes) Temperature Sensor Preprogrammed variable conductivity/ TDS ratios USER mode for programming special temperature compensation factor and conductivity/TDS ratio LOBATT CAL MEMORY KCl NaCl 442 User % / °C RATIO M K mS µS PPM PPT BUFFER COND RES TDS COND RES TDS 4P CAL Units of Measurement Ω Megohms - cm Ω Kilohms - cm mS - millisiemens/cm (millimhos/cm) µS - microsiemens/cm (micromhos/cm) PPM - parts per million PPT - parts per th
FEATURES and SPECIFICATIONS C. Specification Chart A. Features Superior resolution 4 digit LCD displays full 9999 µS/ppm. Accuracy of ±1% of reading (not merely full scale). All electrodes are internal for maximum protection. Latest 4 electrode cell technology. Waterproof to 3 feet/1 meter. Autoranging conductivity/TDS/resistivity. Memory saves 20 readings. Factory calibrations stored in microprocessor. 3 conductivity/TDS solution conversions preprogrammed into microprocessor.
TABLE OF CONTENTS Instrument Illustration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 FEATURES and SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 A. Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 B. General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 2 C. Specification Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 D. Warranty/Service . . . . . . . .
XV. CONDUCTIVITY CONVERSION to TOTAL DISSOLVED SOLIDS (TDS) . . . . . . . . . . . . . . .26 A. How it’s Done . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 B. Solution Characteristics . . . . . . . . . . . . . . . . . . . . . . . .26 C. When does it make a lot of difference? . . . . . . . . . . . 27 XVI. TEMPERATURE COMPENSATION (Tempco) and TDS DERIVATION . . . . . . . . . . . . . . . . . . . . . . . . . . .27 A. Conductivity Characteristics . . . . . . . . . . . . . . . . . . . .
C. Operation of the Keys (See Instrument Illustration on page 1) 1. Measurement Keys in General Any of the 3 measurement keys in the upper part of the keypad turns on the instrument in the mode selected. The mode is shown at the bottom of the display, and the measurement units appear at the right. Pressing a measurement key does this even if you are in a calibration sequence and also serves to abandon a change (ref. Leaving Calibration, pg. 14).
B. Measuring Resistivity Resistivity is for low conductivity solutions. In a cell cup the value may drift from trace contaminants or absorption from atmospheric gasses, so measuring a flowing sample is recommended. 1. 1. Hold instrument at 30° angle (cup sloping downward). 2. 2. Let sample flow continuously into conductivity cell with no aeration. 3. Press R E S NOTE: If reading is lower than 10 kilohms, display will be dashes: [ - - - - ]. Use Conductivity. Press and hold Use MS or MR 4.
2. Disabling Temperature Compensation a. As in Procedure to Select a Solution, pg. 10, select “USER” mode. b. With “USER” selected, press show .00%/°C, hold MR CAL MCLR . If the display does not VI. long enough to bring the tempco to .00%/°C (see Figure 3). c. B. Rules for Calibration in the Ultrameter 1. Calibration Steps a. Starting Calibration MCLR User % / °C Calibration is begun by pressing COND Figure 3 3.
c. Leaving Calibration You know you are finished when the “CAL” icon goes out. Pressing any measurement key abandons changes not yet accepted and exits calibration mode. 2. Calibration Limits There are calibration limits. A nominal “FAC” value is an ideal value stored by the factory. Attempts to calibrate too far, up or down, from there will cause the displayed value to be replaced with “FAC”.
5. Temperature Calibration Temperature calibration is not necessary in the Ultrameter. 1. Press MR and scroll to location #3 . VII. MEMORY This feature allows up to 20 readings with their temperatures to be stored simultaneously for later recall. 2. Press 3. Fill conductivity cell with sample. 4. Press 1. 2. A. Memory Storage While displaying a measurement, press displayed value.
CAL 4. Press MCLR ; the display will change to the other unit. 5. Press COND ; all temperature readings are now in degrees last shown. N O T E : Tempco will still be shown in %/°C. IX. TOTAL RETURN to FACTORY SETTINGS “FAC SEL” There may come a time when it would be desirable to quickly reset all the recorded calibration values in the instrument back to the factory settings.
CARE and MAINTENANCE XII. TROUBLESHOOTING CHART Battery weak or not connected. 1. Dirty electrodes. 2. Test samples greater than 1 megohm. Film or deposits on electrodes. 1. Contamination from previous sample or from pH sensor well. 2. Carbon dioxide in test sample.
XIII. ACCESSORIES A. Conductivity/TDS Standard Solutions Your Ultrameter has been factory calibrated with the appropriate Myron L Company NIST traceable KCl, NaCl, and our own 442 standard solutions. Most Myron L conductivity standard solution bottles show three values referenced at 25°C: Conductivity in microsiemens/micromhos and the ppm/TDS equivalents based on our 442 Natural Water™ and NaCl standards. All standards are within ±1.0% of reference solutions. 1.
2.500% D. A Chart of Comparative Error: In the range of 1000 µS, the error using KCl on a solution that should be compensated as NaCl or as 442, is shown in the graph below. 2.400% 2.300% 7% 2.200% 442 error with KCl tempco 6% 2.100% % / °C 2.000% NaCl error with KCl tempco 5% 4% 1.900% 1.800% KCl % / °C 1.700% 3% 2% 1.600% Temperature 1.500% 0 5 10 15 20 25 30 35 40 45 50 55 60 Chart 1 1% 0% (1)% C.
to indicate a certain setpoint or minimum concentration or trend. The Ultrameter gives the user the capability to take data in “KCl conductivity units” to compare to older published data, in terms of NaCl or 442, or as may be appropriate. The Ultrameter can be used to reconcile data taken with other compensation assumptions, especially with its ability to allow custom characteristics through the USER mode. XV.
Another solution would have a different tempco because of its ionization activity. And, that tempco may be a little different at a different concentration or temperature. This is why the Ultrameter uses mathematically generated models for known salt characteristics that vary with concentration and temperature. B. Finding the Tempco of an Unknown Solution One may need to measure compensated conductivity of some solution unlike any of the 3 standard salts.
Ultrameter™ Operation Manual Addendum Models 4P & 6P Software Versions 2.03, 2.10, 2.51 & Later* * See page 5 to determine the version of software of your Ultrameter™.
I. ENHANCED HIGH RESISTIVITY MEASUREMENTS The resistivity calculations in the Ultrameter have been improved for measuring waters greater than 10 Megohms. When the Ultrameter is in one of the solution modes (i.e. KCl, NaCl or 442) and the resistivity reading is greater than 10 Megohms, the Ultrameter performs automatic temperature compensation for high purity water. As such, the maximum possible value that should be displayed for water is 18.2. It may be possible to display readings higher than 18.
II. USER MODE CALIBRATION LINK 4. A new function has been added to the Ultrameter that makes calibration of the unit while in "User" mode easier, and more repeatable and accurate than other calibration methods. It is recommended that this calibration method be used to provide the highest degree of confidence when the Ultrameter is used in "User" mode. Press the CAL MCLR key. The instrument will display "S E L " and the “User” Icon. Fig. 7. User Figure 7 A. 1. 2.
4. Press the MR key until "User" is the only solution icon being displayed. CAL 5. Press the 6. The User mode calibration "Link" has now been canceled. MCLR key. NOTES: 1. To maintain repeatability, use the same standard solutions for future calibrations. 2. Calibration of the Ultrameter Gain Factor for User mode is not available when the calibration link has been established. The other calibration functions (i.e. Temperature Compensation %/C settings and TDS Ratio settings) are still intact.
