User manual HANNA INSTRUMENTS HI 222

[. . . ] Instruction Manual HI 222 pH/mV/ºC Bench Meter with Calibration Check POOR GOO D SLO W FAST pH ATC C CAL CF GLPM C C LOG RCL CFM/G LP LOG Func RANG E tions pH Ca CAL / SET/C LR Selec t pH/O RP Store Log Inf ormati Reca on ll Log Inform Set ClearInstrume ation Log/C nt Pa al Inf ramete Show ormati rs GLP on Inform ation RCL CFM libratio n / HI 22 Micro 2 Cal proc ibratio esso n r pH Check Mete r Start Calib ration Selec st t 1 Bu ffer Confi rm 1 st RANG Buffe E Selec r t 2 ndBu ffer Confi rm 2 nd Buffe r CFM SE CLRT Manufacturer since 1978 1 www. hannainst. com Dear Customer, Thank you for choosing a Hanna Instruments product. Please read this instruction manual carefully before using the instrument. This manual will provide you with the necessary information for correct use of the instrument, as well as a precise idea of its versatility. For additional technical information, do not hesitate to e-mail us at tech@hannainst. com or refer to back cover for our worldwide contact list. [. . . ] · The instrument optimizes the usage of the memory when it returns to measurement mode after a deleting operation is performed. · If all the records are deleted the instrument returns to the measuring mode. · After the LOG key is pressed or "dEL" is confirmed the instrument will display the amount of free log space for about one second (example: 25 records free). LOG 20 SETUP Setup mode allows viewing and modification of the following parameters: · Calibration Alarm Time Out · Instrument ID · Current Time (hour & minute) · Current Date (month & day) · Current Year · Beep Status · Baud Rate (serial communication) · Command Prefix (serial communication) To enter the Setup mode press the SET/CLR key while the instrument is in measuring mode. Press the CFM key to save the modified value or the CAL key to cancel. CALIBRATION ALARM TIME OUT CHANGE Press the CAL key when the calibration time out is displayed. Calibration time out (OFF=disabled or 1 to 7 days) will begin blinking. Press the ARROW keys to change the calibration time out value. Press the CFM key to save the modified calibration time out value or press the CAL key to cancel without saving the calibration time out. INSTRUMENT ID PARAMETER CHANGE Press the CAL key when the instrument ID is displayed. The instrument ID (0000 to 9999) will begin blinking. 21 Press the ARROW keys to change the instrument ID value. Press the CFM key to save the modified instrument ID value or press the CAL key to cancel without saving the instrument ID. Note: The instrument ID is downloaded to a PC as part of a logged data set to identify it's origin. CURRENT TIME SET Press the CAL key when the current time is displayed. The hour will begin blinking. Press the ARROW keys to change the hour. Press the ARROW keys to change the displayed value. Press the CFM key to save the modified value or press the CAL key to cancel without saving the time. CURRENT DATE SET Press the CAL key when the current date is displayed. Press the ARROW keys to change the displayed value. Press the CFM key to save the modified value or press the CAL key to cancel without saving the date. 22 CURRENT YEAR SET Press the CAL key when the current year is displayed. The year will begin blinking. Press the ARROW keys to change the year. Press the CFM key to save the modified value or press the CAL key to cancel without saving the year. The beep status (On or OFF) will begin to blink. Press the ARROW keys to change the beep status (On or OFF). Press the CFM key to save the modified beep status or press the CAL key to cancel without saving the beep status. A longer beep is also sounded when the limits of the range of a parameter are reached. An audible signal will also sound when the reading becomes stable during calibration. 23 SERIAL COMMUNICATION BAUD RATE SET Press the CAL key when the baud rate is displayed. [. . . ] If the error persists, contact your dealer. 34 TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS The resistance of glass electrodes partially depends on the temperature. It takes more time for the reading to stabilize if the resistance is higher. In addition, the response time will suffer to a greater degree at temperatures below 25 °C. Since the resistance of the pH electrode is in the range of 50-200 Mohm depending on the composition of the glass, the current across the membrane is in the pico-Ampere range. Large currents can disturb the calibration of the electrode for many hours. [. . . ]