User manual HANNA INSTRUMENTS HI 223

[. . . ] 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. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. HI 221 and HI 223 are guaranteed for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. [. . . ] Also, when the instrument cannot evaluate the electrode response or pH 1. If the electrode is in a very poor condition the first condition segment will blink. If electrode response is very slow the first response segment will blink. All data regarding the last calibration (one or two points) is stored for the user to review when necessary. This data includes the following: calibration time stamp, offset (in mV), slope (in mV/pH), electrode condition and response gauges, calibration buffers and the amount of time until a new calibration is required. CALIBRATION ALARM TIME-OUT HI 221 and HI 223 allow the user to set the number of days before the next required pH calibration. Note: 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. Note: The LOG and RCL tags remain on LCD while instrument is in the viewing logged data mode. Press the ARROW keys to scroll between same parameter for different records, while pH, mV, temperature, Hour, Year, oFFS, SLoP or dEL record is displayed: Or to scroll between different dates while dAtE or dEL date is displayed. Press the RANGE key and the instrument will display the next logged parameter, as follows: The mV value on the primary LCD and the record number on the secondary LCD. Note: Before displaying the Hour, Year, oFFS or SLoP messages, the record number is displayed for about one second. 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 (date) using the ARROW keys. Press SET key to select the current record, the records from the selected date or all records to be deleted. Press the CFM key to confirm the deleting of the selected record, all the records for the selected date, or all the records and the instrument will display on the secondary LCD the nuLL message. Note: Pressing RANGE key the instrument skips to the pH information on the next undeleted record. 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). 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 pH Resolution (HI 223 only) 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. [. . . ] - The meter is not calibrated on the current day - only one point calibration is done. The meter displays empty Not enough data to E lectrode Response scale. 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. [. . . ]