User manual HANNA INSTRUMENTS HI 99171

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Manual abstract: user guide HANNA INSTRUMENTS HI 99171

Detailed instructions for use are in the User's Guide.

[. . . ] Automatic Temperature Compensation indicator 2. Measuring unit for primary display www. hannainst. com This Instrument is in Compliance with the CE Directives WARRANTY All Hanna Instruments meters are warranted for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. The probes are warranted for a period of six months. This warranty is limited to repair or replacement free of charge. [. . . ] To freeze the display While in measurement mode, press the SET/ HOLD button, HOLD appears on the secondary display and the reading will be frozen on the LCD (E. g. Press any button to return to normal mode. To turn the meter OFF While in normal measurement mode, press the ON/OFF/MODE button. OFF will appear on the secondary display. Note: The meter is provided with an acoustic signal feature, which can be disabled using the switch located in the battery compartment. Note: When the meter detects the absence of a temperature probe at its input, the Automatic Temperature Compensation is turned off, and the meter uses a default value of 25°C (77°F) for the temperature measurement and compensation. In this condition, the secondary LCD shows 25. 0°C (77. 0°F) blinking. When a probe is connected, the meter automatically returns to the ATC mode, the ATC tag is turned on, and the temperature is shown on the secondary display. Note: To clean the meter, do not use aggressive detergents. It is recommended to use water. pH MEASUREMENT & CALIBRATION · Make sure the meter has been calibrated before use. · If the probe is dry, soak it in HI 70300 storage solution for one hour to reactivate it. · Place the tip of the probe on the sample to be tested and wait until the symbol on the top left of the LCD is turned off. · The LCD shows the pH value (automatically compensated for temperature) on the primary LCD, while the secondary LCD shows the temperature of the solution. · After each measurement, it is recommended to perform a complete cleaning of the probe: use the suitable Cleaning solutions (see "Accessories" section) and clean the probe tip thoroughly to eliminate dirtiness and avoid crosscontamination. · When not in use, switch the meter OFF and clean the probe with the specific Cleaning solutions (see "Accessories" section) before storing it. pH calibration For better accuracy, frequent calibration of the instrument is recommended. In addition, the instrument must be recalibrated whenever: a) The pH electrode is replaced. · From normal mode, press and hold the ON/ OFF/MODE button until OFF on the secondary display is replaced by CAL. · The LCD enters the calibration mode, displaying "pH 7. 01 USE" (or "pH 6. 86 USE" if the NIST buffer set was selected). After 1 second the meter activates the automatic buffer recognition feature. If a valid buffer is detected, then its value is shown on the primary display, and REC appears on the secondary LCD. If no valid buffer is detected, the meter keeps the USE indication active for 12 seconds, and then replaces it with WRNG, indicating that the sample being measured is not a valid buffer. · For a single-point calibration with buffers pH 4. 01, 9. 18 or 10. 01, the meter automatically accepts the calibration when the reading is stable; the meter will show on the primary display the accepted buffer, with the message "OK 1" on the secondary display, and an audible signal is produced. [. . . ] To enter the Setup mode, press and hold the ON/ OFF/MODE button until CAL on the secondary display is replaced by TEMP and the current temperature unit (E. g. Then: · for °C/°F selection, use the SET/HOLD button. After the temperature unit has been selected, press ON/OFF/MODE to enter the buffer set selection mode; press ON/OFF/MODE twice to return to the normal measuring mode. · to change the calibration buffer set, after setting the temperature unit, the meter will show the current buffer set: "pH 7. 01 BUFF" (for 4. 01/ 7. 01/10. 01) or "pH 6. 86 BUFF" (for 4. 01/6. 86/ 9. 18). [. . . ]

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