User manual HANNA INSTRUMENTS HI 93114

[. . . ] Instruction Manual HI 93114 Turbidity & Chlorine Measurements www. hannainst. com Dear Customer, Thank you for choosing a HANNA instruments® product. Please read this instruction manual carefully before using the instrument. This manual will provide you with the necessary information for the correct use of the instrument, as well as a precise idea of its versatility. For any additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] 5. 34 NTU: + TURBIDITY MEASUREMENTS Fill the vial with the sample. Follow the 2 point procedure on page 26 before proceeding. Turn the meter on, and press both ALT and CAL buttons. + 16 17 Insert the reacted sample into the cuvet holder and make sure that the notch on the cap is positioned securely into the groove. Press READ. CALIBRATION TURBIDITY CALIBRATION The meter should be properly calibrated with a standard prepared as described in USEPA method 180. 1. Span calibration To calibrate the span of the meter, fill the cuvet with the primary turbidity formazine standard of 50 NTU. Inspect and clean thoroughly the surface of the vial. Shake the standard vigorously for a few seconds and wait a few minutes for the bubbles to disappear. Turn the meter on and press both ALT and CAL momentarily. The meter will first show "SIP" for a few seconds and afterwards the sample concentration: + The LCD will show four dashes on the upper and "d 00" on the lower part of the LCD with the second "0" blinking. Using the , and keys change the lower row of the display to show "d 21". Insert the previously prepared 50 NTU standard into the cuvet holder and make sure that the notch on the cap is positioned securely into the groove. Press 18 19 The display will blink "-Lt-" for several seconds, indicating that the LED is being adjusted for the turbidimetric channel. Afterwards, a sequence of numbers between -511 to 512 will appear on the upper part of the LCD indicating different levels of LED light intensity. In approximately one minute, the adjustment will be made and the calibration data stored in the non-volatile memory. The display will show four dashes again indicating the end of the span calibration procedure. Press the ALT and CAL keys together again to leave the diagnostic mode. If the CAL key is not pressed, the upper display will show "----", indicating that calibration mode was not entered. In which case, hold down the ALT and CAL keys together for 3 seconds to restart the procedure. After entering the calibration mode, the display will show the first point of the previous calibration. The most significant digit will also be blinking. Using the , , keys, set the turbidity of first calibration standard (from 0. 00 to 50. 0 NTU). Insert the standard vial into the cuvet holder and ensure that the notch is positioned securely into the groove. The display will indicate Sample In Progress (SIP). + Two-point customized calibration To enter the turbidity calibration mode, the meter should be in "turbidity" mode. Use the and keys to set the lower level of the LCD to "tr". [. . . ] If service is required, contact the dealer from whom the instrument was purchased. If under warranty, report the model number, date of purchase, serial number and the nature of the failure. First obtain a Returned Goods Authorization number from the Customer Service department and then return the instrument indicating the Authorization # with shipment costs prepaid. If the repair is not covered by the warranty, you will be notified of the charges. [. . . ]