User manual HANNA INSTRUMENTS HI 95715

[. . . ] Instruction Manual HI 95715 Ammonia Medium Range ISM www. hannainst. com This Instrument is in Compliance with the CE Directives 1 Dear Customer, Thank you for choosing a Hanna product. This manual will provide you with the necessary information for the correct use of the instrument. Please read it carefully before using the meter. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] Once this indication is displayed, the meter will lock up. "Configuration": this indicates that the meter has lost its configuration. Contact your dealer or the nearest Hanna Customer Service Center. CALIBRATION MODE MESSAGES The date of the last calibration appears on the LCD each time the calibration mode is entered. If calibration is performed for the first time, "F. CAL" appears. This indicates that the factory calibration is selected. 9 The flashing digits indicate that: 1) the month can be set 2) the day can be set "Storage": this prompt appears for 1 second at the end of the calibration procedure, to indicate that the calibration data has been stored. "Error": the concentration of the calibration solution used is not correct. Repeat the calibration procedure with the right standard solution, and verify it is not expired. If the calibration procedure fails again, contact your dealer or the nearest Hanna Customer Service Center. ERROR MESSAGES a) on zero reading This indicates that the zeroing procedure failed due to a low signalto-noise ratio. "No Light": the instrument cannot adjust the light level. Please check that the sample does not contain any debris. "Light Low": there is not enough light to perform a measurement. · Each time the cuvet is used, the cap must be tightened to the same degree. · Whenever the cuvet is placed into the measurement cell, it must be dry outside, and completely free of fingerprints, oil or dirt. Wipe it thoroughly with HI 731318 (tissue for wiping cuvets, see chapter ACCESSORIES) or a lint-free cloth prior to insertion. · Do not let the reacted sample stand too long after reagent is added, or accuracy will be lost. · It is possible to take multiple readings in a row, but it is recommended to take a new zero reading for each sample and to use the same cuvet for zeroing and measurement. · After the reading it is important to discard immediately the sample, otherwise the glass might become permanently stained. · All the reaction times reported in this manual are referred to 20°C (68°F). As a general rule of thumb, they should be doubled at 10°C (50°F) and halved at 30°C (86°F). · In order to maximize accuracy, prior to a measurement follow the validation procedure to be sure that the instrument is properly calibrated. [. . . ] Keep READ/TIMER pressed to scroll to the desired day number (01-31). Note: it is possible to change from day to month and vice versa by pressing ZERO. · When both the day and month have been selected, hold CAL CHECK for three seconds to store date and calibration values. The instrument will show for one second "Stor", to confirm that the new calibration data has been accepted. [. . . ]