Hanna Instruments HI 98140 Instruction Manual

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Hanna Instruments HI 98140 Instruction Manual Manual pdf 7 page image

1312pH CALIBRATION PROCEDUREFor greatest accuracy, it is recommended that the instrument iscalibrated frequently. For a faster procedure, it is possible to calibrateat 1 point, but it is always a good practice to calibrate at 2 points.A two-point calibration can use any combination of the three sets:(4.01) (6.86 / 7.01) (9.18 / 10.01)Only one value from each set can be selected. For example if pH7.01 is used as first point, it will not be possible to select pH 6.86as the second point.In the case of a two-point calibration (in the acidic range) from 0 to7 pH, use pH buffer 7.01 (or 6.86) as the first solution and pH buffer4.01 as the second solution. if testing in the alkaline range from 7 to14 pH, use pH buffer 10.01 (or 9.18) as the second solution.Due to electrode conditioning time, the electrode must be keptimmersed a few seconds to stabilize. The meter is equipped with astability indicator and the user will be guided step by step with easyindications on the LCD during the calibration. This will make thecalibration a simple and error-free procedure.pH CALIBRATION1. Rinse the electrode with a portion of thefirst calibration buffer or clean water.Dip the bottom 4 cm (1½") of theelectrode into a beaker containing thesolution.2. Press CAL when the meter displays pHmeasurement.3. Enter the password (if different from "0000") with the arrow keys.4. Press ALT and CFM to confirm the password or CAL to exit.5. If password is correct, the meter displays "7.01pH" on the lowerLCD with the "BUF 1" and "CAL" indication. The upper LCD showsthe uncalibrated pH reading.TAKING ORP MEASUREMENTS(HI98150 ONLY)Connect the ORP electrode to the meter and press the ON/OFF key.The meter automatically sets the mV range.If the ORP electrode is not connected the LCD will display the "noprobe" message and then dashed lines in place of the readings.To take ORP measurements, simply submerge the bottom 4 cm (1½")of the ORP electrode in the solution to be tested, stir gently and allowfor the reading to stabilize.Note: The ORP electrodes are not provided with the temperaturesensor.By continuously pressing the RANGE key the following information willbe displayed on the upper LCD:• Time• Day - Month• YearPressing RANGE again, the meter returns to mV reading.Note: If measurements are taken successively in different samples, itis recommended to rinse the electrode thoroughly with deion-ized water or if not available tap water first and then withsome of the next sample to condition the electrode beforeimmersing it in the sample to be tested.The temperature sensor is integrated in the pH electrode.Immerse the pH electrode in the solution (allow a few minutes for thetemperature to stabilize) and press the ON/OFF key. The temperatureis displayed in the lower LCD.Note: If temperature measurement is out of range the LCD willdisplay " - - -".TAKING TEMPERATURE MEASUREMENTS