User manual HANNA INSTRUMENTS LP 2000

[. . . ] 7 CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 LCD AND ERROR CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] · Fill a clean cuvette up to one quarter inch (0. 5 cm) from its rim with the thoroughly agitated sample. · Allow sufficient time for bubbles to escape before securing the cap. · Wipe the cuvette thoroughly with a lint-free tissue (HI 93703-70) before inserting the cuvette into the measurement cell. The cuvette must be completely free of finger marks, oil or dirt, especially in the area where the light passes through, i. e. · Place the cuvette into the holder and check that the notch on the cap is positioned securely into the groove. 7 · The mark on the cuvette cap should point towards the keyboard. · Press the READ/ key and the LCD will display an intermittent "SIP" (Sampling In Process). · The turbidity value will appear after approximately half a minute. · Though LP 2000 covers a wide turbidity range, highly accurate readings exceeding 40 FTU require dilution as recommended by the Standard Methods. Use the formula below to calculate the amount of HI 93703-0 or turbidity-free water needed for accurate dilution. Vos = 3000 / T where: Vos = volume of original sample (mL) to be added to HI 93703-0 to obtain the total diluted volume of 100 mL. T = LP 2000 reading (exceeding 40 FTU) E. g. : LP 2000 reading = 200 FTU 3000 / 200 = 15 mL (Vos) 15 mL (Vos)+85 mL (HI 93703-0) = 100 mL At this point, take a sample of this diluted solution and measure its turbidity. The correct turbidity value of the original sample is derived by: Ta= Tn x 100 mL / Vos where: Ta = actual turbidity value of the original sample Tn = LP 2000 reading of the diluted solution E. g. If Tn = 27 Ta = 27 x 100 mL / 15 mL = 180 FTU 8 TIPS TO OBTAIN BEST ACCURACY · Each time the cuvette is used, tighten the cap to the same degree. · Discard the sample immediately after the reading is taken to prevent permanent clouding of the glass. · All glassware used to contain the standards and the samples should be kept clean, washed with HI 93703-50 cleaning solution and rinsed with HI 93703-0 or turbidity-free water. · Samples should be collected in clean glass or plastic bottles with appropriate stoppers. If the sample requires storage, it should be kept in a cool dark place. Stored samples should be restored to room temperature prior to analysis. · To obtain a representative sample, gently and thoroughly, stir the solution. To prevent air bubbles from forming do not shake or let the solution settle prior to sampling. · Monthly calibration of the meter, using HI 93703-10 @ 10 FTU standard is recommended. · Before inserting cuvettes into the instrument, wipe them with HI 93703-70 or a soft, lint-free tissue. Handle vials so that no fingerprints are left on the areas where light passes through, i. e. If you experience any problems in taking measurements, please contact your dealer or the nearest Hanna Customer Service Department. SOURCES OF INTERFERENCE · The presence of floating debris and coarse sediments which may settle rapidly will give false readings. [. . . ] If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization number from the Customer Service department and then send it with shipping costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection. All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments Inc. , 584 Park East Drive, Woonsocket, Rhode Island, 02895 , USA. Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. [. . . ]