User manual HANNA INSTRUMENTS HI 99130101

[. . . ] 500 hours of continuous use Environment 0 to 50°C (32 to 122°F); RH max 100% Dimensions / Weight 150 x 80 x 36 mm (5. 9x3. 1x1. 4'') / 210 g (7. 4 oz. ) Range w w w . h a n n a i n s t . c o m 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. Damage due to accidents, misuse, tampering or lack of prescribed maintenance are not covered. [. . . ] · 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. Press either button to return to normal mode. · To turn the meter off, press and hold the MODE button while in normal measurement mode. "OFF" will appear on the lower part of the display. 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. · Select the pH mode with the SET/HOLD button. · 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). · Press SET/HOLD to change the buffer set. · Press MODE to return to normal pH mode. 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. The meter will automatically recognize the buffer value. 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). [. . . ] · 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. [. . . ]