Oakton 35631-00 Operating Instructions Manual

Oakton 35631-00 Operating Instructions Manual Manual pdf 7 page image

13124. Press CAL/MEAS to enter pH calibrationmode. The CAL indicator lights. Theprimary display will show the measuredreading while the smaller secondarydisplay will indicate the pH standardbuffer solution.See figure5. Wait for the measured pH value tostabilize. If the READY indicator hasbeen activated (set up program P3.1—see page 28), the READY annunciatorlights when the reading is stable.6. Press ENTER to confirm calibration.The meter is now calibrated to thecurrent buffer. The lower display scrollsthrough the remaining buffer options.• If you are performing multipointcalibration, go to step 7.• If you are performing one-pointcalibration, go to step 9.7. Rinse the electrode with de-ionizedwater or a rinse solution, and place itin the next pH buffer.8. Follow steps 5 to 8 for additionalcalibration points.9. When calibration is complete,press CAL/MEAS to return to pHmeasurement mode.See figureNotesTo exit from pH Calibration mode without confirming calibration, DO NOT pressENTER in step 6. Press CAL/MEAS instead.If the selected buffer value is not within ±1.0 pH from the measured pH value: theelectrode and buffer icon blink and the ERR annunciator appears in the lower leftcorner of the display.To limit the number of pH buffer values available during calibration, see Set-upprogram P3.2 on page 29.ATCREADYMEASCpHCCREADYCAL pHpHBBConductivity and TDS calibrationCalibrate up to 5-point conductivity or 5 point TDS calibration at one point per range:Range Conductivity: TDS:R1 0.00-19.99 μS 0.00-9.99 ppmR2 0.0-199.9 μS 10.0-99.9 ppmR3 0-1999 μS 100-999 ppmR4 0.00-19.99 mS 1.00-9.99 pptR5 0.0-199.9 mS 10.0-199.9 pptIf you are measuring values in more than one range, make sure to calibrate each ofthe ranges you are measuring. All new calibration data will over-ride existing storedcalibration data for each measuring range you calibrate.• If you are measuring in ranges near to or greater than 20 mS (10 ppt), or near toor lower than 100 μS (50 ppm), calibrate the meter at least once a week to getspecified ±1% F.S. accuracy.• If you are measuring in the mid ranges and you washed the probe in deionizedwater and stored it dry, calibrate the meter at least once a month.• If you take measurements at extreme temperatures, calibrate the meter at leastonce a week.Preparing for conductivity/TDS calibrationFor best results, select a standard value close to the sample value you aremeasuring. Alternatively, use a calibration solution value that is approximately2⁄3 the full scale value of the measurement range you plan to use. For example,in the 0 to 1999 μS conductivity range, use a 1413 μS solution for calibration.See the table below for recommended calibration solution ranges:4.3Temperature coefficient: These meters are factory set to a temperature coefficientof 2.1% per °C. For most applications this will provide good results. SeeProgram P8.1 on page 38 to set the temperature coefficient to a different value.See Appendix 31, “Calculating Temperature Coefficients” on page 50 to determinethe appropriate temperature coefficient for your solution.Normalization temperature: The factory default value for normalization tempera-ture is 25°C. If you need to normalize to a value other than 25°C, see Program P8.2on page 39.CONTINUED ON NEXT PAGEConductivity Recommended TDS RecommendedRange Cal. Solution Range Range Cal. Solution Range0.00-19.99 μS 6.00 to 17.00 μS 0.00-9.99 ppm 3.00 to 8.50 ppm0.0-199.9 μS 60.0 to 170.0 μS 10.0-99.9 ppm 30.0 to 85.0 ppm0-1999 μS 600 to 1700 μS 100-999 ppm 300 to 850 ppm0.00-19.99 mS 6.00 to 17.00 mS 1.00-9.99 ppt 3.00 to 8.50 ppt0.0-199.9 mS 60.0 to 170.0 mS 10.0-199.9 ppt 30.0 to 170 ppt