TechPro™ Operation Manual Model AR1 MYRON L COMPANY 10-02 (WEB-EG)
Instrument Illustration Conductivity Cell (Built-in Electrodes) Temperature Sensor User selectable temperature compensation ratios (Solution Selection) Units of Measurement Parameter LO BATT KCl NaCl 442 °C COND mS µS PPM PPT mS - millisiemens/cm (millimhos/cm) µS - microsiemens/cm (micromhos/cm) PPM - parts per million PPT - parts per thousand Conductivity Conductivity TDS TDS TDS Icons for either Conductivity or Total Dissolved Solids (TDS) COND TDS CONDUCTIVITY Measurement key: User selectable
FEATURES and SPECIFICATIONS D. Warranty/Service The Myron L AR1 has a limited two year warranty. If an instrument fails to operate properly, see Troubleshooting Chart, pg. 13. The battery is userreplaceable. For other service, return the instrument prepaid to the Myron L Company. A.
TABLE OF CONTENTS IX. CARE and MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 A. Temperature Extremes . . . . . . . . . . . . . . . . . . . . . . . . 12 B. Battery Replacement (LO BATT) . . . . . . . . . . . . . . . . 12 C. Cleaning Cell Cup . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 X. TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 XI. ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I. INTRODUCTION Thank you for selecting the TechPro™ Series, Model AR1, one of the Myron L Company’s latest in a new line of digital instruments utilizing advanced circuitry. This circuitry makes it very accurate and easy to use (see pages 2 & 3 for Features and Specifications on this and other models). For your convenience, on the bottom side of your AR1 is a brief set of instructions. Special note ...... Conductivity/TDS require mathematical correction to 25°C values (ref. Temperature Compensation, pg.
V. SOLUTION SELECTION A. Why Solution Selection is Available Conductivity and TDS require temperature correction to 25°C values (ref. Standardized to 25°C, pg. 15). Selection determines the temperature correction of conductivity and calculation of TDS from compensated conductivity (ref. Conductivity Conversion to TDS, pg. 17). B. The 3 Solution Types On the left side of the display is the salt solution characteristic used to model temperature compensation of conductivity and its TDS conversion.
C. Calibration Procedures C. Conductivity or TDS Practices to Maintain Calibration a. Rinse conductivity cell three times with proper standard (KCl, NaCl or 442) (ref. Conductivity/TDS Standard Solutions, pg. 14). 1. Clean oily films or organic material from the cell electrodes with foaming cleaner or mild acid. Do not scrub inside the cell. b. Refill conductivity cell with same standard solution. 2. c. Press Calibrate with solutions close to the measurements you make.
12 Clean cell cup and electrodes (ref. Cleaning Cell Cup, pg. 12). Film or deposits on electrodes. Clean cell cup and electrodes. (ref. Cleaning Cell Cup, pg. 12) Unstable Conductivity or Film or deposits on electrodes. TDS readings. Unable to calibrate Conductivity or TDS. Check connections or replace battery. (ref. Battery Replacement, pg. 12). Symptom Possible Cause C. Cleaning Cell Cup The cell cup should be kept as clean as possible.
XI. ACCESSORIES A. Conductivity/TDS Standard Solutions Your AR1 has been factory calibrated with the appropriate Myron L Company NIST traceable standard solution. 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.
change with concentration and temperature instead of single average values. C. An Example of 2 different solution selections and the resulting compensation: How much error results from treating natural water as if it were KCl at 15°C? A tap water solution should be compensated as 442 with a tempco of 1.68 %/°C, where the KCl value used would be 1.90 %/°C. Suppose a measurement at 15°C (or 59°F) is 900 microsiemens of true uncompensated conductivity. Using a 442 correction of 10 (degrees below 25) x 1.
their solution, like the KCl favored by chemists for its stability. Users dealing with sea water, etc., use NaCl as the model for their concentration calculations. Users dealing with freshwater work with mixtures including sulfates, carbonates and chlorides, the three predominant components (anions) in freshwater that Myron L Company calls “natural water”.
XV. GLOSSARY Anions - Negatively charged ions. See Solution Characteristics, pg. 17. Algorithm - A procedure for solving a mathematical problem. See Temperature Compensation and TDS Derivation, pg. 18. TDS Total Dissolved Solids or the Total Conductive Ions in a solution. See Conductivity Conversion to TDS, pg. 17. - Tempco - NOTES Temperature Compensation See Temperature Compensation, pg. 15. For details on specific areas of interest refer to Table of Contents.
