User manual HANNA INSTRUMENTS HI 9026V

[. . . ] Instruction Manual HI 9026V Complete Portable Kit for pH, mV & Temperature Measurements in Wine and Must with Calibration-CheckTM www. hannainst. com 1 Dear Customer, Thank you for choosing a Hanna product. Please read this instruction manual carefully before using the instrument. This manual will provide you with the necessary information for correct use of the instrument, as well as a more precise idea of its versatility. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com or contact the nearest technical office. [. . . ] Note: During calibration, the secondary LCD shows the selected buffer value; press RANGE to display the buffer temperature. Note: To clear a previous calibration and return to the default values, press CLR at any time after entering the calibration mode. The LCD will show "CLr CAL" for one second, and then returns to normal measurement mode. The LCD will show an empty bargraph and a blinking CAL tag to warn the user that the meter is not calibrated. One-point calibration For optimum accuracy it is always recommended to perform a two-point calibration, but for a faster operation it is also possible to carry out a singlepoint procedure. Buffers at pH 7. 01 or pH 6. 86 (NIST) are the most appropriate for this purpose, even though meters can be calibrated with any of the memorized calibration values. 11 After calibrating the first point (see above), press the CAL key to end the calibration procedure. Note: With one-point calibration there is not "Condition" and only the frame is shown. Calibration time-out is active. CONDITION The display is provided with a 5-dot bargraph (unless the feature is disabled) which gives indications about the electrode status after calibration as follows: Bargraph indication Condition value All 5 dots steady 4 dots steady 3 dots steady 81 to 100% of life 61 to 80% 41 to 60% 21 to 40% 1 to 20% 0% No info available CUSTOM BUFFER SELECTION · For setting the custom buffer values, from pH mode press the CAL key: the meter will start from pH 7. 01 buffer. · Press the CUSTOM BUF key and use arrows for selecting the desired value for C1. 2 dots steady 1 dot steady Note: To increase the speed, keep pressed the UP or DOWN arrow key. · Press again the CUSTOM BUF key to store the first custom buffer and scroll to the second one. Enter C2 with the arrow keys, then press again CUSTOM BUF and the meter will return to the standard buffers mode For pH measurements of wine and must, it is recommended to set the pH 3. 00 custom buffer value. 1 dot blinking Only frame is ON EXPIRED CALIBRATION The instrument is provided with a real time clock (RTC), in order to monitor the time elapsed since the last pH calibration. The real time clock is reset every time the meter is calibrated and the "expired calibration" status is triggered when the meter detects a calibration time-out. The CAL tag will start blinking to warn the user that the meter should be recalibrated. The calibration time-out can be set (see "Setup menu" section at page 9) from 0 (function disabled) to 14 days. For example, if a 4 days time-out has been selected the meter would issue the alarm exactly 4 days after the last calibration. However, if at any moment the expiration value is changed (e. g. to 7 days), then the alarm will be immediately recalculated and appear 7 days after the last calibration. Notes: · When the meter is not calibrated or calibration is cleared (default values loaded) there is no "expired calibration", and the display always shows a blinking CAL tag. · When an abnormal condition in the RTC is detected the meter forces the "expired calibration" status. 12 The "condition" bargraph remains active for 12 hours after calibration, then only the frame is shown. Note: When an abnormal condition in the RTC is detected, the "condition" is cleared and only the bargraph frame is shown on display. CLEAN ELECTRODE Each time the pH calibration is performed, the meter internally compares the new calibration data with the ones previously stored. When this comparison indicates a significant difference, the CLEAN message blinks on the LCD to advise the user that the pH electrode may need to be cleaned (see "Electrode Maintenance" section). [. . . ] · Slow Response/Excessive Drift: soak the tip in HI 7061 solution for 30 minutes, rinse thoroughly in distilled water and then follow the cleaning procedure above. Recommendations for Users Before using these products, make sure that they are entirely suitable for the environment in which they are used. Operation of these instruments in residential area could cause unacceptable interference to radio and TV equipment, requiring the operator to take all necessary steps to correct interference. The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid touching this glass bulb at all times. [. . . ]