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Manual abstract: user guide HANNA INSTRUMENTS HI 991000
Detailed instructions for use are in the User's Guide.
[. . . ] Battery replacement The meter displays the remaining percentage when turned on. When the battery level is below 5%, the - + symbol on the bottom left of the LCD lights up to indicate a low battery condition. If the battery level is low enough to cause erroneous readings, the Battery Error Prevention System (BEPS) turns the HI 991000 off. [. . . ] To turn HI 991000 off Press the ON/OFF/MODE button from normal measuring mode. To freeze the display Press the SET/HOLD button for 2 seconds until HOLD appears on the bottom display. Press any button to return to normal mode.
· Press the SET/HOLD button for changing the buffer set. · Press the ON/OFF/MODE button to return to normal pH measuring mode.
pH calibration · Press and hold the ON/OFF/MODE button for 3 seconds, until OFF on the bottom display is replaced by CAL. The LCD will display pH 7. 01 USE or pH 6. 86 USE (if you selected the NIST buffer set). · For a single point pH calibration, place the probe in any buffer from the selected buffer set (eg. The meter will recognize the buffer value and will display OK for 1 second. If the pH 7. 01 buffer (or 6. 86 if you selected the NIST buffer set) was used, press the ON/OFF/MODE button to return to the pH measuring mode. · For a two point pH calibration, place the probe in pH 7. 01 (or 6. 86, if you selected the NIST buffer set). The LCD will display the recognized buffer value and OK for 1 second and then display pH 4. 01 USE. Place the probe in the second buffer value (pH 4. 01 or 10. 01, or, if using NIST, pH 4. 01 or 9. 18). When the second buffer is recognized, the LCD will display OK for 1 second and the meter will return to normal measuring mode.
pH MEASUREMENTS & CALIBRATION · Make sure the meter has been calibrated. · If the electrode has been left dry, soak in pH 7 to reactivate. · Place the tip of the probe in the sample to be tested. [. . . ] The bottom LCD will display ESC for 1 second and the meter will return to normal measuring mode. The "CAL" symbol on the LCD will disappear. The meter will be reset to the default calibration. [. . . ]
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