User manual HANNA INSTRUMENTS HI 96708C

[. . . ] Instruction Manual HI 96708 Nitrite High Range ISM www. hannainst. com 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. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. TABLE OF CONTENTS PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] · Calibration mode: may be entered by keeping CAL CHECK pressed for three seconds (the "CAL" tag appears), it enables calibration of the instrument. · GLP mode may be entered by pressing GLP/ ("GLP" appears), it enables consulting of user calibration date or restore factory calibration. DISPLAY ELEMENTS DESCRIPTION 5 4 3 9 2 1 10 6 7 8 1) The measuring scheme (lamp, cuvette, detector), appears during different phases of zero or reading measurement 2) Error messages and warnings 3) The battery icon shows the charging level of the battery 4) The hourglass appears when an internal checking is in progress 5) Status messages 6) The chronometer appears when the reaction timer is running 7) The month, day and date icons appear when a date is displayed 8) Four digit main display 9) Measuring units 10) Four digit secondary display 8 ERRORS AND WARNINGS The instrument shows clear messages when erroneous condition appears. Messages are also displayed when the obtained values are outside expected range. a) on zero reading Light High: There is too much light to perform a measurement. Please check the preparation of the zero cuvette. Light Low: There is not enough light to perform a measurement. Please check the preparation of the zero cuvette. No Light:The instrument cannot adjust the light level. Please check that the sample does not contain any debris. b) on sample reading Inverted cuvettes: The sample and the zero cuvette are inverted. Zero: A zero reading was not taken. Follow the instructions of the measurement procedure for zeroing the meter. 9 Under range: A blinking "0" indicates that the sample absorbs less light than the zero reference. Check the procedure and make sure you use the same cuvette for reference (zero) and measurement. Over Range: A flashing value of the maximum concentration indicates an over range condition. The concentration of the sample is beyond the programmed range: dilute the sample and re-run the test. c) during calibration procedure Standard Low: The standard reading is less than expected. Standard High: The standard reading is higher than expected. d) other errors and warnings Cap error: Appears when external light enters in the analysis cell. · In order to maximize accuracy, prior to a measurement follow the validation procedure to be sure that the instrument is properly calibrated. If necessary, calibrate the instrument. STARTUP Prepare the instrument for measurement as follows: · Unpack the instrument by removing the dust protection sleeve from the instrument cuvette holder. · Place the battery in the instrument as described in the "BATTERY REPLACEMENT" chapter. · Do not place the instrument under direct sun light. MEASUREMENT PROCEDURE To compensate the meter for the sample turbidity or color, the measurement takes place in two phases. The display briefly shows all tags on. 12 · When the beeper sounds briefly and the LCD displays dashes, the meter is ready. The blinking "ZERO" indicates that the instrument needs to be zeroed first. · Fill the cuvette with 10 mL of unreacted sample, up to the mark, and replace the cap. · Place the cuvette into the cuvette holder and ensure that the notch on the cap is positioned securely into the groove. · Press ZERO/CFM and the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. · After a few seconds, the display will show "-0. 0-". The meter is now zeroed and ready for measurement. 13 · Remove the cuvette. · Add the content of one packet of HI 93708-0 reagent. Replace the cap and shake gently. · Replace the cuvette into the cuvette holder and ensure that the notch on the cap is positioned securely into the groove. · Press and hold READ/ /TIMER for three seconds. In both cases, the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase. · At the end of measurement, the instrument directly displays concentration in mg/L of nitrite on the LCD. · To convert the NO2- ion concentration to NO2--N concentration, divide the reading by a factor of 3. 29. · To convert the NO2- ion to sodium nitrite NaNO2 concentration, multiply the reading by a factor of 1. 5. [. . . ] · Press GLP/ to enter GLP mode. 20 · Press READ/ /TIMER to enter in the factory calibration restore screen. The instrument asks for confirmation of user calibration delete. · Press ZERO/CFM to restore the factory calibration or press GLP/ again to abort factory calibration restore. · The instrument briefly notifies "done" when restores factory calibration and returns to measurement mode. BATTERY MANAGEMENT To save battery, the instrument shuts down after 10 minutes of non-use in measurement mode and after 1 hour of non-use in calibration mode. If a valid measurement was displayed before auto-shut off, the value is displayed when the instrument is switched on. The blinking "ZERO" means that a new zero has to be performed. [. . . ]