User manual HANNA INSTRUMENTS HI 88703

[. . . ] c o m 1 Dear Customer, Thank you for choosing a Hanna Instruments product. This manual will provide you with the necessary information for correct use of the instrument. Please read this instruction manual carefully before using the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com or see the back side of this manual for our worldwide sales and technical service contacts. [. . . ] Depending which menu you are in, a screen with additional information will appear. To read all available data, scroll down or up the text using the UP or DOWN keys. Press the "Support" functional key to access a page with Hanna support centers and their contact details. Press the "Accessories" functional key to access a page with instrument accessories. To exit support or accessories screens, press ESC, and the instrument will return to the previous help screen. To exit help mode just press the HELP key again and the meter will display the last screen the user was in before entering help mode. MEASUREMENT PROCEDURE FOR RATIO / NON RATIO TURBIDITY RANGE When taking turbidity measurements, several basic rules should be followed: · Always use cuvets without scratches or cracks because they can cause inaccurate readings. · Always cap the cuvets to avoid spillage of the sample into the instrument. · Do not use too much oil to prevent contamination of the optical system. To take turbidity measurements, follow the next steps: · Turn the instrument ON by pressing ON/OFF. The current time appears on the upper left corner of the display and the range name appears on the lower right corner. · Fill a clean, dry cuvet with 10 mL of sample up to the mark, taking care to handle the cuvet by the top. 17 · Wipe the cuvet thoroughly with a lint-free cloth to remove any fingerprints, dirt or water spots. · Apply silicone oil on the cuvet and wipe with a lint-free cloth to obtain an even film over the entire surface of the cuvet. Note: It is very important to oil the cuvet, especially for low turbidity values (< 1 NTU) to hide the glass imperfections which can influence the reading. Align the mark from the cuvet with the sign on the instrument top · Close the lid. Note: If you have a cuvet with indexing mark, place the cuvet into the instrument with the indexing mark aligned with the sign on the instrument top. NORMAL MEASUREMENT This type of measurement is best suited for regular readings, when the sample is stable and normal accuracy is required. In normal mode, the measurement takes about 10 seconds and the lamp is ON for a minimum period of time (about 7 seconds). · Press "Read" functional key to take the measurement. The display will show "READ" in the left side and blinking dashes. The dashes and lamp icon will appear during different measurement phases. · The result is displayed in the selected units. CONTINUOUS MEASUREMENT This measurement mode is suitable when many measurements have to be taken in a short period of time. This measurement mode is recommended for indexing cuvets. 18 · Press "Read" functional key and keep it pressed to take continuous readings. The display will show "READ" in the left side and blinking dashes. The dashes and lamp icon will appear during different measurement phases. [. . . ] Press ESC to return to the Setup mode. 29 LAMP REPLACEMENT The instrument tungsten lamp has a life longer than 100, 000 measurements. When the lamp is broken, the instrument displays a lamp error message. To replace the lamp follow the next steps: · Power off the instrument and take out the power cord. · Unlock the lamp and extract it by pulling it out from the lamp holder handler. · Place the new lamp in the right position and push it until is securely locked. [. . . ]