User manual HANNA INSTRUMENTS HI 93711

[. . . ] A flashing value higher than the maximum concentration readable (see specifications) indicates that the sample absorbs too much light, meaning that the concentration is too high. The cuvet is not inserted correctly and an excess ambient light is reaching the detector. If the cover is properly installed, then contact your dealer or the nearest Hanna Customer Service Center. The zero sample is too dark for proper zeroing. [. . . ] When shipping any instrument, make sure it is properly packaged for complete protection. To validate your warranty, fill out and return the enclosed warranty card within 14 days from the date of purchase. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments Inc. , Woonsocket, Rhode Island, 02895 , USA. Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. The HI 93711 meter measures the free and total chlorine (Cl2) content in water and wastewater. The meter uses an exclusive positive-locking system to ensure that the cuvet is in the same place every time it is placed into the measurement cell. The reagents are in liquid and powder form and are supplied in bottles and in packets. The amount of reagent is precisely dosed to ensure maximum repeatability. Display codes aid the user in routine operations. The meters have an auto-shut off feature that will turn the instrument off after 10 minutes of non-use. Light Emitting Diode @ 555 nm Adaptation of the EPA recommended DPD method 330. 5. The reaction between the chlorine and the DPD reagent causes a pink tint in the sample. Light Detector Silicon Photocell Environment 0 to 50°C (32 to 122°F); max 95% RH non-condensing Battery Type/Life 1 x 9 volt/40 hours Auto-Shut off After 10' of non-use Dimensions 80 x 83 x 46 mm (7. 1 x 3. 3 x 1. 8") Weight 290 g (10 oz. ). REQUIRED REAGENTS POWDER: Code Unit HI 93701-0 Free Cl2 HI 93711-0 Total Cl2 LIQUID: Code Unit HI 93701A-T Free and Total Cl2 HI 93701B-T Free and Total Cl2 HI 93701C Total Cl2 only Description DPD DPD Description DPD1 indicator DPD1 buffer DPD3 solution Quantity 1 packet 1 packet Quantity 3 drops 3 drops 1 drop V OPERATIONAL GUIDE MEASUREMENT PROCEDURE · Turn the meter on by pressing ON/OFF. ON OFF · When the LCD displays "- - -", it is ready. · Select free or total Chlorine by pressing FREE/TOTAL. An "I" or a "C" will appear on the right corner to indicate free or total chlorine, respectively. FREE TOTAL · Replace the cap and shake gently for 20 seconds (or 2 minutes in case of seawater analysis). · Replace the cuvet into the holder and ensure that the notch on the cap is positioned securely into the groove. · Wait for 1 minute in case of Free Chlorine or 2 minutes and 30'' seconds in case of Total Chlorine and then press READ. The display will show "SIP" during measurements. · The instrument directly displays concentration in mg/L of Free or Total Chlorine on the Liquid Crystal Display. Note: free and total chlorine have to be measured separately with fresh unreacted samples following the above procedure if both values are requested. · Shaking the cuvet can generate bubbles in the sample, causing higher readings. To obtain accurate measurements, remove such bubbles by swirling or by gently tapping the vial. · 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). INTERFERENCES Interference may be caused by: Bromine Iodine Fluorine Ozone Oxidized manganese and Chromium Alkalinity above 250 mg/L or acidity above 150 mg/L will not reliably develop the full amount of color or it may rapidly fade. [. . . ] · It is important that the sample does not contain any debris. · It is possible to take multiple readings in a row, but it is recommended that a zero reading be taken for each sample and that the same cuvet is used for zeroing and measurement. · It is important to discard the sample immediately after the reading is taken because the glass might become permanently stained. CE DECLARATION OF CONFORMITY · Wait for a few seconds and the display will show "-0. 0-". Now the meter is zeroed and ready for measurement. [. . . ]