900-C Conductivity, TDS, Resistivity, Ratio, Meter - TPS

4.8 TDS CalibrationBefore attempting a TDS calibration, ensure that the 900-C has been set up correctly, according tosections 4.1 to 4.7. The calibration procedure detailed below uses the sample configurations shownin sections 4.1 to 4.7.Also ensure that Temperature has been correctly calibrated (see section 7.1). A “ ∗ ” in theTemperature readout in place of the decimal point indicates that Temperature is NOT calibrated.1. Plug the TDS sensor into the CELL socket and the temperature sensor into the TEMP socket.(The separate temperature sensor is not required for combination TDS/Temperature sensors.)2. Rinse the TDS and temperature sensors in distilled water. Shake off as much water as possible.Blot the outside of the sensor dry. DO NOT BLOT THE ELECTRODE PLATES.Zero Calibration3. Let the sensor dry in air.4. Select TDS Calibration ( → F1:Calibrate → F1:TDS).5. The 900-C will recognise the low TDS signal and attempt a Zero calibration. For example…0*01ppM k=1*00 25.0 O cPress Enter to Zero probe or Menu Exit.6. When the reading has stabilised at or near zero, press to calibrate or to quit. The ∗will not be removed after a zero calibration.Standard Calibration7. Place the TDS sensor into a sample of TDS standard, so that it is immersed correctly, withadequate clearance to the floor and walls of the vessel. See section 17.2 for details of correctsensor immersion.DO NOT place the sensor directly into the bottle of standard. Discard the used sample ofstandard after use.Select TDS Calibration ( → F1:Calibrate → F1:TDS). The calibration screen willbe displayed, with the TDS standard to be used. For example…2000*ppM k=1*00 25.0 O cPress Enter to Calibrate. STD=2000 ppM.8. When the reading has stabilised, press to calibrate. The ∗ will now be replaced by adecimal point, if calibration was successful.9. The 900-C is now calibrated for TDS and is ready for use in this mode.19