User manual HANNA INSTRUMENTS HI 99130101

[. . . ] Damage due to accidents, misuse, tampering or lack of prescribed maintenance are not covered. If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report the model number, date of purchase, serial number and the nature of the problem. If the repair is not covered by the warranty, you will be notified of the charges incurred. [. . . ] · To change the temperature unit (from °C to °F), press and hold the MODE button until "TEMP" and the current temperature unit are displayed on the secondary LCD (e. g. Then use SET/HOLD to change the temperature unit, and press the MODE button until the meter returns to normal measurement mode. · To freeze the display, press and hold SET/HOLD until "HOLD" appears on the secondary display (e. g. · To turn the meter off, press and hold the MODE button while in normal measurement mode. pH MEASUREMENT & CALIBRATION · Before taking any measurement make sure the meter has been calibrated. · If the probe has been left dry, soak in a storage or pH 7 solution at least for one hour to reactivate it. · Submerge the probe in the sample to be tested while stirring it gently. Wait until the stability indicator on the top left of the LCD disappears. · The pH value automatically compensated for temperature is shown on the primary LCD, while the secondary LCD shows the sample temperature. · If measurements are taken in different samples successively, rinse the probe tip thoroughly with water and then with some of the next sample to be measured. Calibration Buffer Set Selection · While in pH measurement mode, press and hold the MODE button until "TEMP" and the current temperature unit are displayed on the lower LCD (e. g. · Press the MODE button again to 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). pH Calibration · While in pH measurement mode, press and hold the MODE button until "CAL" is displayed on the lower LCD. The LCD will display "pH 7. 01 USE" (or "pH 6. 86 USE", if you have selected the NIST buffer set). · For a single point pH calibration, place the probe in any buffer from the selected buffer set (eg. If using pH 7. 01 (or pH 6. 86 from the NIST buffer set), after recognition of the buffer press MODE to return to the pH measurement mode. · For a two point pH calibration, place the probe in pH 7. 01 (or pH 6. 86, if you have selected the NIST buffer set). The meter will recognize the buffer value and then display "pH 4. 01 USE". · Place the probe in the second buffer (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 measurement mode. To Clear Previous Calibrations, press the MODE button after entering the calibration mode. [. . . ] · Release the button and immerse the probe in the HI 7031 calibration solution ("µS 1413 USE"). · Once the calibration has been automatically performed, the LCD will display "OK" for 1 second and return to normal measurement mode. · Since there is a known relationship between the EC and TDS reading, it is not necessary to calibrate the meter in TDS. If the TDS conversion factor is either 0. 5 or 0. 7, the meter will allow a direct calibration in ppm by using the Hanna TDS calibration solutions (see "Accessories" section). BATTERY REPLACEMENT The meter displays the remaining battery percentage every time it is turned on. [. . . ]