User manual HANNA INSTRUMENTS HI 991405

[. . . ] If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization Number from the Customer Service department and then send it with shipment costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection. Reproduction in whole or in part is prohibited without the written consent of the copyright owner. GENERAL DESCRIPTION HI 991404 and HI 991405 have been designed for continuous, high accuracy pH, EC/TDS and temperature measurements. [. . . ] To avoid electrical shock, do not use this instrument when voltages at the measurement surface exceed 24 Vac or 60 Vdc. To avoid damages or burns, do not perform any measurement in microwave ovens. Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. IST991404R2 07/05 OPERATIONAL GUIDE Preliminary operations Connect the pH electrode to the meter. Connect the 12 Vdc adapter to the meter and to the mains; the display will lit. To change the temperature unit To change the temperature unit (from °C to °F), from measurement mode, press and hold the MODE button until "TEMP" and the current temperature unit are displayed on the lower LCD (E. g. Use the SET/HOLD button to change the temperature unit, and then press MODE button twice to return to normal measurement mode. To freeze the display Press and hold the SET/HOLD button for 2-3 seconds, until "HOLD" appears on the secondary display. Taking measurements Select the pH, EC or TDS mode with the SET/HOLD button. In order to ensure better accuracy, probes should not touch or stand close to the walls or bottom of the sample vessel. The pH, EC or TDS value automatically compensated for temperature is shown on the primary LCD while the secondary LCD shows the temperature of the sample. Measurements should be taken when the stability symbol on the top left of the LCD disappears. IMPORTANT NOTE Measurements have to be taken with both pH electrode and conductivity/temperature probe (also working as matching pin) immersed in the same vessel. To change the TDS conversion factor (CONV) and the temperature compensation coefficient (BETA) · From 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 conversion factor (E. g. · Press the MODE button to show the current temperature coefficient (E. g. To turn the meter off Press the MODE button while in normal measurement mode. Notes: · Before taking any measurement make sure the meter has been calibrated. · To clear a previous calibration, press the MODE button after entering the calibration mode. The lower LCD will display "ESC" for 1 second and the meter will return to normal measurement mode. · If measurements are taken in different samples successively, rinse the probes thoroughly to eliminate cross-contamination; and after cleaning, rinse the probes with some of the sample to be measured. CALIBRATION pH calibration buffer set · From 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 standard set (for pH 4. 01/7. 01/ 10. 01) or "pH 6. 86 BUFF" for NIST buffer (pH 4. 01/ 6. 86/9. 18). pH calibration procedure From pH measurement mode, press and hold the MODE button until "CAL" is displayed on the lower LCD. [. . . ] The CAL symbol on the LCD means that the meter is calibrated. ACCESSORIES HI 1293D HI 7630 (*) HI HI HI HI HI HI HI HI HI HI HI HI HI HI 7004M 7006M 7007M 7009M 7010M 7030M 7031M 7032M 7038M 70442M 7061M 70300M 710005 710006 Spare pH electrode with differential input & DIN Conductivity probe with built-in temperature sensor (also working as matching pin) pH 4. 01 solution, 230 mL bottle pH 6. 86 solution, 230 mL bottle pH 7. 01 solution, 230 mL bottle pH 9. 18 solution, 230 mL bottle pH 10. 01 solution, 230 mL bottle 12. 88 mS/cm solution, 230 mL bottle 1413 µS/cm solution, 230 mL bottle 1382 ppm solution, 230 mL bottle 6. 44 ppt solution, 230 mL bottle 1500 ppm solution, 230 mL bottle Electrode cleaning solution, 230 mL bottle Electrode storage solution, 230 mL bottle 115 Vac/12 Vdc power adapter, US plug 230 Vac/12 Vdc power adapter, European plug pH ELECTRODE MAINTENANCE · When not in use, rinse the electrode with water and store it with a few drops of HI 70300 storage solution in the protective cap. · If the electrode has been left dry, soak in a storage or pH 7 solution for at least one hour to reactivate it. · To prolong the life of the pH electrode, it is recommended to clean it monthly by immersing it in the HI 7061 cleaning solution for half an hour. Afterwards, rinse it thoroughly with tap water and recalibrate the meter. · For a two-point pH calibration, place the electrode and the probe in pH 7. 01 (or 6. 86 if you have selected the NIST buffer set). [. . . ]