User manual HANNA INSTRUMENTS LP2000-11

[. . . ] Instruction Manual LP2000-11 Precision Bench Turbidity Meter with PC Communication www. hannainst. com Dear Customer, Thank you for choosing a Hanna Product. Please read this instruction manual carefully before using the instrument. It will provide you with the necessary information for the correct use of the instrument, as well as a precise idea of its versatility. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] ON/OFF/CLR key to switch the meter ON and OFF, and clear log memory 7. Secondary LCD (displays the year when date is on the primary level, the sample index when storing a value or viewing the log memory) 8. Primary LCD (Liquid Crystal Display) · When the LCD displays "----" the meter is ready to take measurements. · Fill a clean cuvet up to 0. 5 cm (one quarter inch) from its rim with the thoroughly agitated sample. Note: Wipe the cuvet thoroughly with HI 93703-70 or a lint-free tissue before inserting it into the measurement cell. The cuvet must be completely free of fingerprints and other oil or dirt, particularly in the area where the light goes through (approx. the bottom 2 cm/1"). · Place the cuvet into the cell and check that the notch on the cap is positioned securely into the groove. · Even though LP2000-11 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 = LP2000-11 reading (exceeding 40 FTU) E. g. : LP2000-11 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 = LP2000-11 reading of the diluted solution E. g. If Tn = 27 Ta = 27 x 100 mL / 15 mL = 180 FTU* Note: Any sample above 1000 FTU* will show out of range by blinking "1000". · The mark on the cuvet cap should point towards the keyboard. · Press the READ key and the LCD will display a blinking "SIP" (Sampling in Process). The turbidity value will appear after approximately 20 seconds. * 1 FTU = 1 NTU 8 9 STORING SAMPLES IN MEMORY · After taking a reading, press the STO button. The last sample read will be stored in memory and the display will also show on the bottom right hand corner the reference number of the stored sample. Note: When the maximum number of samples has been reached (500), the display will show "FULL". This is a warning that you will be overwriting the oldest sample recorded. To store the current sample, press the STO button again and this will overwrite the oldest sample in the memory. All samples are shifted and sample number one is always the oldest sample. VIEWING LOGGED DATA · Press the ALT & VIEW buttons. The last stored sample will be displayed. · Press the right arrow to scroll between turbidity value, date and time sample was taken. · Press the UP/DOWN arrows to scroll between samples taken. CLEARING LOGGED DATA · Press the ALT & CLR buttons. The display will show "CLR" for confirmation. Press ALT & CLR again to clear memory or any other key to abort the operation. · Press ALT & VIEW buttons again to exit this mode. DATE AND TIME SETUP VIEWING: · Press ALT & DATE to toggle between date and time. SETTING: · Press and hold ALT & DATE for 3-4 seconds. · Press UP/DOWN arrows to correct and set the year. ALL SAMPLES PREVIOUSLY STORED WILL BE ERASED FROM MEMORY! 10 11 · Press right arrow to scroll to month and day, use UP/DOWN to set. · Press right arrow again to scroll to time, use UP/DOWN to set. · Press right arrow again to save and exit date and time setup. · Internal Bus error* err5 · Low LED Voltage* * Contact the nearest HANNA Customer Service Center. ENSURE ACCURATE MEASUREMENTS Note: Press ALT & DATE to leave this mode without saving. [. . . ] If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report the model number, date of purchase, serial number and the nature of the failure. If the repair is not covered by the warranty, you will be notified of the charges incurred. 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. [. . . ]