User manual EUTECH INSTRUMENTS TDS TESTR REV 0

[. . . ] The upper display will be the adjustable reading for calibration whereas the lower display will be the default reading of the standard. HOLD Function This feature lets you freeze the display for a delayed observation. Press HOLD button to freeze the measurement. A `HOLD' indicator will be displayed and the measurement will be frozen. Press HOLD again to release the measurement. [. . . ] Press either the INC or DEC key to enter the TDS Factor Setting mode. The upper display will be the adjustable TDS factor whereas the lower display will be the last TDS Factor setting. Use the INC or DEC key to set the correct TDS factor for your sample measurement. Wait for 5 seconds for the tester to automatically confirm the new setting by displaying "CO" and return to the measurement mode. Before you begin: Remove the electrode's protective cap. Soak the electrode for a few minutes in alcohol to remove any oil stains on the electrodes which will affect the accuracy of the tester. Rinse thoroughly with deionized water and shake off dry. DEC DEC Figure 1: Example of a calibration sequence using 2764 µS calibration standard Calibration The tester is factory calibrated. However, to ensure accuracy, you can calibrate the tester on a regular basis. Depending on the model selected, you can calibrate the Conductivity / TDS / Salt / Temperature on a one point calibration using the appropriate calibration standard. The following table lists each model allowable calibration range when selecting a calibration standard. It is best to select a standard close to the test solution value. Model Calibration Standard Range Te E C Te s t r l o w 200 to 1990 uS/cm Te E C Te s t r l o w + 200 to 1999 uS/cm Te E C Te s t r h i g h 2. 00 to 19. 90 mS/cm Te E C Te s t r h i g h + 2. 00 to 19. 99 mS/cm Te E C Te s t r p u r e + 20. 0 to 199. 9 uS/cm Measurement 1. Press the ON/OFF button to switch the tester on. Dip the electrode into the test solution making sure that it is fully immersed. Stir to clear any trapped air bubbles from the electrode and let the reading stabilize. For plus models, you can opt for the cup style measurement by filling the electrode cup with sample of test solution. Note the value or press HOLD button to freeze the reading. To release the reading, press HOLD again. If you do not press a button for 8. 5 minutes, the tester will automatically shut off to conserve batteries. INC INC DEC DEC After 5 sec, "CO" is displayed signifying automatic confirmation Figure 5: Example of setting the TDS Factor ON/OFF Electrode Maintenance Figure 2: Example of a Power Up Sequence Model Calibration Standard Range TDSTestr low TDSTestr low+ TDSTestrhigh TDSTestrhigh+ TDSTestr pure+ LT TDSTestr lo w TDSTestr lo w+ TDSTestrhigh TDSTestrhigh+ TDSTestr pur e+ S A L T e s t r 200 to 1990 ppm 200 to 1999 ppm 1. 00 to 10. 00 ppt 1. 00 to 10. 00 ppt 20. 0 to 199. 9 ppm 1. 00 to 10. 00 ppt Table 1 1. Always keep the sensor electrodes clean. Rinse the electrodes with de-ionized water and wipe them dry with clean cloth before storing with its protective cap. For the plus models, remove the white plastic cup insert to thoroughly clean viscous solutions. [. . . ] Replacement sensor is not connected properly to the tester during sensor replacement Measured value or temperature value (for plus models) exceeds its specified maximum or minimum value Blinking `ATC', `Or' or `Ur' indicates that there is a short or open circuit at the built in temperature sensor Calibration error due to temperature value not within the specified range Calibration error due to Conductivity/TDS/Salt value not within the specified calibration standard range Note: To exit this program without confirming the calibration, press the °C/°F button or the HOLD button before the automatic confirmation takes place. Note: The tester will exit calibration mode with "Er. 0" message if the temperature is outside the 0 to 50°C range. Please refer to information under 'Self Diagnostic Messages'. Notes: The temperature calibration window is +/- 5°C (+/- 9°F) from the default temperature reading. Over range / Under range signal ATC / Or / Ur (Blinking) Error Message E r. [. . . ]