User manual HANNA INSTRUMENTS HI 4212

[. . . ] Instruction Manual HI 4211 & HI 4212 pH/mV/ISE/Temperature Bench Meters w w w. c o m 1 Dear Customer, Thank you for choosing a Hanna Instruments product. This manual will provide you with the necessary information for correct use of the instrument. Please read this instruction manual carefully before using the instrument. [. . . ] To calibrate the instrument using Manual Selection buffer entry type: · Press . If the instrument was calibrated before and calibration was not cleared, the old calibration . can be cleared by pressing Note: It is very important to clear calibration history when a new electrode is used because most errors and warning messages that appear during calibration depend on calibration history. · Immerse the pH electrode and the temperature probe approximately 4 cm (1½") into a buffer solution of your choice (pH 1. 68, 3. 00, 4. 01, 6. 86, 7. 01, 9. 18, 10. 01, 12. 45 or a custom buffer) and stir gently. The "Please · Select the used pH calibration buffer with wait. . . " message will appear on the LCD until the reading is stable or the buffer is validated. The · If the pH buffer is validated, calibration buffer will be added to the Calibrated Buffers section. · Immerse the pH electrode and the temperature probe into the next buffer solution and follow the above to exit calibration. procedure or press Notes: · The new added calibration point will replace an old one if the difference between them is ±0. 2 pH. · If the existing stored calibration is full (five calibration points), a pop-up menu will be displayed on the LCD in which you can select with or keys the buffer you want to replace with the current to delete the selected buffer buffer. after entering · When in MTC mode, if pressing pH calibration and while a HANNA pH calibration buffer with a x. xxx resolution is selected, a pop-up menu will be displayed on the LCD in which the temperature value or . 40 · When in MTC mode, if pressing after entering calibration and while a custom pH calibration buffer is selected, a pop-up menu will be displayed on the LCD in which the custom buffer and the temperature value and then can be ajusted by pressing or keys. Press to save the modified / to select next/ value and then previous value to be adjusted. after entering · When in ATC mode, if pressing calibration and while a standard pH buffer (with a x. xxx resolution) or a custom pH buffer is selected, a pop-up menu will be displayed on the LCD in which or the buffer value can be ajusted using . · If the Automatic buffer entry type has been selected for the calibration procedure, the instrument will automatically select the closest buffer to the measured pH value from the edit buffer group (see pH Setup for details, page 20). · If the Semiautomatic buffer entry type has been selected for the calibration procedure, the instrument will automatically select the closest buffers to the measured pH value from all the available buffers and the used buffer value can be selected with or . CALIBRATION MESSAGES · Wrong buffer. Please check the buffer: this message appears when the difference between the pH reading and the value of the selected calibration buffer is significant. If this message is displayed, check if you have selected the appropriate calibration buffer. · Wrong buffer temperature: this message appears if the buffer temperature is out of the defined buffer temperature range. Press <Accept> to update calibration: this message alerts the user that some dirt or deposits could be on the electrode. Please check the buffer: these messages appear if the current slope is under 80% or over 110% of default slope. Press <Clear Cal> to clear old calibration: these messages appear as a result of an erroneous slope condition. Please check the buffer or the buffer list (for Semiautomatic and Automatic buffer entry type): this message appears if the current buffer value is not close to any of the buffers from the buffer list/group. [. . . ] Use: biotechnology, micro titration. 69 HI 1131B Glass-body, single junction, refillable, combination pH electrode. Use: general purpose. HI 1330B Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: laboratory, vials. HI 1331B Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: flasks. HI 1230B Plastic-body (Ultem®), double junction, gel-filled, combination pH electrode. [. . . ]