User manual HANNA INSTRUMENTS HI 95724

[. . . ] Instruction Manual HI 95724C Free & Total Chlorine ISM MAN95724C 01/04 w w w . h a n n a i n s t . c o m www. hannainst. com This Instrument is in Compliance with the CE Directives 24 1 Dear Customer, Thank you for choosing a Hanna product. This manual will provide you with the necessary information for the correct use of the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. This instrument is in compliance with directives. USER NOTES Date Parameter Code Validation Value (mg/L) Passed yes not Calibration yes not TABLE OF CONTENTS PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Given that the absorption of a compound strictly depends on the wavelength of the incident light beam, a narrow spectral bandwidth should be selected as well as a proper central wavelength to optimize measurements. The optical system of Hanna's HI 95 series colorimeters is based on special subminiature tungsten lamps and narrow-band interference filters to guarantee both high performance and reliable results. I I I I / o o Block diagram (optical layout) 6 19 BATTERY REPLACEMENT Battery replacement must only take place in a non-hazardous area. Detach the battery from the terminals and attach a fresh 9V battery while paying attention to the correct polarity. Insert the battery and replace the cover. 9V SLIDE OFF A microprocessor controlled special tungsten lamp emits radiation which is first optically conditioned and beamed to the sample contained in the cuvet. Then the light is spectrally filtered to a narrow spectral bandwidth, to obtain a light beam of intensity o or The photoelectric cell collects the radiation that is not absorbed by the sample and converts it into an electric current, producing a potential in the mV range. The microprocessor uses this potential to convert the incoming value into the desired measuring unit and to display it on the LCD. The measurement process is carried out in two phases: first the meter is zeroed and then the actual measurement is performed. The cuvet has a very important role because it is an optical element and thus requires particular attention. It is important that both the measurement and the calibration (zeroing) cuvets are optically identical to provide the same measurement conditions. It is necessary that the surface of the cuvet is clean and not scratched. 3) the Month and Day icons appear above the number of month and day when a date is displayed. 4) the blinking "Battery" icon appears when the battery voltage is getting low. Note: at this point it is possible to reset the instrument to restore FACTORY CALIBRATION, see instructions page 17. · Place the CAL CHECKTM Standard Cuvet A into the holder and ensure that the notch on the cap is positioned securely into the groove. GUIDE TO DISPLAY CODES This prompt appears for 1 second each time the instrument is turned on. The parameter code "724" indicates that the meter is in a ready state and zeroing can be performed. This flashing prompt appears each time the meter is performing a measurement. This indicates that the meter is in a zeroed state and measurement can be performed. The blinking "BAT" indicates that the battery voltage is getting low and the battery needs to be replaced. "Configuration": this indicates that the meter has lost its configuration. CALIBRATION MODE MESSAGES The date of the last calibration appears on the LCD each time the calibration mode is entered. If calibration is performed for the first time, "F. CAL" appears. This indicates that the factory calibration is selected. 1 or 2 · Press ZERO and "SIP" will blink on the display. · Remove the cuvet and place the CAL CHECKTM Standard HI 95724-11 Cuvet B into the holder. [. . . ] · For a correct filling of the cuvet: the liquid in the cuvet forms a convexity on the top; the bottom of this convexity must be at the same level of the 10 mL mark. · Proper use of the dropper: (a) to get good reproducible results, tap the dropper on the table for several times and wipe the outside of the dropper tip with a cloth. (b) always keep the dropper bottle in a vertical position while dosing the reagent. · Alkalinity above 250 mg/L CaCO3 or acidity above 150 mg/L CaCO3 will not reliably develop the full amount of color or it may rapidly fade. · In case of water with hardness greater than 500 mg/L CaCO3, shake the sample for approximately 2 minutes after adding the powder reagent. VALIDATION PROCEDURE Use the validation procedure to ensure that the instrument is properly calibrated. [. . . ]