User manual HANNA INSTRUMENTS HI 96771C

[. . . ] Instruction Manual HI 96771C Chlorine Ultra High Range ISM www. hannainst. com This Instrument is in Compliance with the CE Directives 1 2 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. This instrument is in compliance with directives. TABLE OF CONTENTS PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] · 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. If necessary, calibrate the instrument. 13 STARTUP Prepare the instrument for measurement as follows: · Unpack the instrument by removing the dust protection sleeve from the instrument cuvet holder. · Place the battery in the instrument as described in the "BATTERY REPLACEMENT" chapter. · Do not place the instrument under direct sun light. RANGE SELECTION The HI 96771 can measure chlorine ULTRA HIGH RANGE when range P1 is selected or chlorine LOW RANGE when range P2 is selected. To change the active range follow the procedure: · Turn the meter on by pressing ON/OFF. The display briefly shows all tags on. · After startup, the range identification number is displayed on the secondary LCD as P1 or P2. Code P1 P2 Parameter Chlorine Low Range Chlorine Ultra High Range or · Press RANGE/GLP/ to change the range. The range can be changed any time when the instrument is in measurement mode. The selected range is memorized and the selection remaines unchanged at power off or when the battery is removed. 14 MEASUREMENT PROCEDURE To compensate the meter for the sample turbidity or color, the measurement takes place in two phases. Important note: Chlorine ULTRA HIGH RANGE and chlorine LOW RANGE have to be measured separately with fresh unreacted samples if both values are requested. MEASUREMENT PROCEDURE FOR CHLORINE LOW RANGE (P1) Warning: If the Chlorine Low Range reagent is added to a sample with high chlorine concentration the color formed can be rapidly bleached, resulting erroneous low readings. · 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 cuvet with 10 mL of unreacted sample, up to the mark, and replace the cap. · Place the cuvet into the cuvet holder and ensure that the notch on the cap is positioned securely into the groove. · Press ZERO/CFM and the lamp, cuvet and detector icons will appear on the display, depending on the measurement phase. 15 · After a few seconds, the display will show "-0. 0-". · Add the content of the one packet of HI 93701-0 Free Chlorine reagent. · Replace the cuvet into the cuvet 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, cuvet 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 free chlorine and the range number on the LCD. 16 INTERFERENCES Bromine (positive error) Oxidized Manganese and Chromium (positive error) Chlorine dioxide (positive error) Ozone (positive error) Iodine (positive error) Alkalinity above 250 mg/L CaCO3 or acidity above 150 mg/L CaCO3 will not reliably develop the full amount of color or it may rapidly fade. [. . . ] · Press and hold for three seconds RANGE/GLP/ to enter GLP mode. 23 · Press READ/ /TIMER to enter in the factory calibration restore screen. · Press ZERO/CFM to restore the factory calibration or press RANGE/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. [. . . ]