User manual HANNA INSTRUMENTS HI 2222

[. . . ] Instruction Manual HI 2222 pH/mV/ºC Bench Meter with Calibration Check w w w. c o m 1 Dear Customer, Thank you for choosing a Hanna Instruments product. Please read this instruction manual carefully before using this instrument. This manual will provide you with the necessary information for correct use of this instrument, as well as a precise idea of its versatility. [. . . ] to 5 days), then the alarm will be immediately recalculated and appear 5 days after the last calibration. Notes: · If the instrument was not calibrated, or if the calibration history was deleted, the "CAL DUE" message will be displayed even if this feature is disabled in the SETUP menu. · If the instrument was calibrated using an electrode with pin and the electrode is changed with an electrode without pin or vice-versa "CAL DUE" will blink. p H CALIBRATION DATA Calibration data is stored automatically after a successful calibration. To view the pH calibration data, press the GLP key when the instrument is in pH measuring mode. Use the ARROW keys to scroll through the calibration data: · The time (hh:mm). · The date (yyyy / mm. dd). · The pH calibration offset. 17 · The pH calibration slope in mV/pH normalized to 25 °C (the percentage is referred to the ideal value of 59. 16 mV/pH). Note: If you calibrate using electrodes with pin the electrode condition and response gauges appear while the offset and slope are displayed. · The pH calibration buffers in calibrating order and with the selected resolutions used during calibration. The first pH calibration buffer: The second pH calibration buffer: · If "no bUF" message appears on the LCD, the instrument informs you that the calibration was performed with less than two buffers. · Calibration Expiration status: - if disabled. - or the number of days until the calibration alarm will be displayed, - or if expired (7 days ago). · The instrument ID. 18 Notes: · Press GLP to return to measurement mode. · If calibration has not been performed, the instruments display "no CAL" message blinking. LOGGING Up to 100 logged samples can be stored into memory. LOGGING THE CURRENT DATA To store the current reading into memory press the LOG key while in measuring mode. The instrument will display the current date (mm. dd) on the primary LCD, the record number on the secondary LCD and the "LOG" tag will blink for a few seconds (see example below: record No. 27 dated July 14): If there are less than 5 memory locations remaining, the record number and the "Lo" message will be displayed, to alert the user. If the log space is full, the "FULL LOG" message will be displayed and no more data will be saved. Along with the current measurement, the date, time, mV value, temperature and calibration data is stored. VIEW LOGGED DATA Press RCL while in measurement mode to retrieve the stored information. If no data was logged, the instrument displays: 19 The instrument will display the logged measurement value on the primary LCD and the record number on the secondary LCD, along with the "LOG" and "RCL" tags. Note: The "LOG" and "RCL" tags remain on LCD while in memory recall mode. Press the RCL key to return to measurement mode. Press the ARROW keys to scroll between same parameter for different records: Press the RANGE key to view additional data: · The mV value on the primary LCD and the temperature on the secondary LCD. · The year on the primary LCD and the month and day on the secondary LCD. · The hour and minutes on the primary LCD and the record number on the secondary LCD. · The calibration offset on the primary LCD and the "oFFS" message on the secondary LCD. · The calibration slope on the primary LCD and the "SLoP" message on the secondary LCD. 20 Note: On the screens where record number is not displayed press the SETUP key to display the record number. The "dEL" message will be displayed on the primary LCD and the selected record on the secondary LCD. The "CFM" and the "DEL" tags will blink: Press the ARROW keys to change the selected record. To delete all records press the SETUP key, "ALL" tag will appear on the secondary LCD. Press the CFM key to confirm the deleting of the selected record, or all records. Instrument will display on the primary LCD the "nuLL" message. LOG RCL Notes: · The RANGE key has no effect if "nuLL" record message is displayed on the first LCD line. · You can skip this message by selecting an undeleted record using the ARROW keys. · The instrument optimizes the usage of the memory when it returns to measurement mode after a deleting operation is performed. [. . . ] In addition, the response time will suffer to a greater degree at temperatures below 25 ºC. TEMPERATURE CORRELATION FOR p H SENSITIVE GLASS Since the resistance of the pH electrode is in the range of 50 ­ 200 Mohm, the current across the membrane is in the pico Ampere range. Large currents can disturb the calibration of the electrode for many hours. For these reasons high humidity environments, short circuits and static discharges are detrimental to a stable pH reading. If constantly used at high temperatures, the electrode life is drastically reduced. [. . . ]