Accumet AP85 Instruction Sheet
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Contents
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494812. Appendix 2: Calculating TDS Conversion FactorsYou can calibrate your meter using TDS calibration standard solutions. The calibra-tion standard only needs to give the TDS value at a standard temperature such as25°C. To determine to the conductivity-to-TDS conversion factor use the followingformula:Factor = Actual TDS ÷ Actual Conductivity @ 25°CDefinitions:Actual TDS: Value from the solution bottle label or as a standard you make usinghigh purity water and precisely weighed salts.Actual Conductivity: Value measured using a properly calibrated Conductivity/Temperature meter.Both the Actual TDS and the Actual Conductivity values must be in the samemagnitude of units. For example, if the TDS value is in ppm the conductivity valuemust be in μS; if the TDS value is in ppt the conductivity value must be in mS.Check your factor by multiplying the conductivity reading by the factor in the aboveformula. The result should be the TDS value.13. Appendix 3: Calculating Temperature CoefficientsTo determine the temperature coefficient of your sample solution use this formula:CT2 - CT1TC = 100 x _________________________C T1(T2 - 25) - CT2(T1 - 25)TC = Temperature coefficientCT1 =Conductivity at Temp. 1 CT2 = Conductivity at Temp. 2T1 = Temp. 1 (in °C) T 2 = Temp. 2 (in °C) 25 = 25°CNOTE: A controlled temperature water bath is ideal for this procedure.1. Immerse the probe into a sample of your solution and adjust the temperaturecoefficient to 0% (that is, no compensation) by performing the following:A. From conductivity measurement mode, press the SETUP key.B. Press the s key until the lower display reads P8.0.C. Press the ENTER key twice. The lower display reads tCO and the upperdisplay shows the temperature coefficient value.D. Press the t key until the upper display shows 0.0.E. Press ENTER key to confirm the value.F. Press CAL/MEAS key twice to return to measurement mode.2. Wait for 5 minutes. Note T1 and CT1 (conductivity at T1).3. Condition the sample solution and probe to a temperature (T2) that is about 5°Cto 10°C different from T1, and note the conductivity reading CT2.NOTE: Record your results for future reference. Ideally T 1 and T2 should bracketyour measurement temperature, and should not differ by more than 5°C.4. Calculate the temperature coefficient of your solution according to the formulashown above.5. Enter the temperature coefficient you calculated into the meter.A. From conductivity measurement mode, press the SETUP key.B. Press the s key until the lower display reads P8.0.C. Press the ENTER key twice. The lower display reads tCO and the upperdisplay shows the temperature coefficient value (should be 0, per step 1-Dabove).D. Press the s key until the upper display shows your calculated temperaturecoefficient.E. Press ENTER key to confirm the value.F. Press CAL/MEAS key twice to return to measurement mode.The calculated temperature coefficient will now be applied to all conductivity/TDSreadings. |
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