User manual HANNA INSTRUMENTS HI 95729

[. . . ] Instruction Manual HI 95729C Fluoride Low Range ISM MAN95729CR2 10/04 w w w . h a n n a i n s t . c o m www. hannainst. com This Instrument is in Compliance with CE Directives 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. Please read it carefully before using the meter. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] 5 · Press ZERO and "SIP" will blink on the display. · After a few seconds the display will show "-0. 0-". The meter is now zeroed and ready for calibration. · Place the CAL CHECKTM Standard HI 95729-11 Cuvet B into the holder and ensure that the notch on the cap is positioned securely into the groove. 16 PRINCIPLE OF OPERATION Absorption of Light is a typical phenomenon of interaction between electromagnetic radiation and matter. When a light beam crosses a substance, some of the radiation may be absorbed by atoms, molecules or crystal lattices. If the value found is out of specifications, please check that the cuvets are free of fingerprints, oil or dirt and repeat validation. If results are still found out of specifications then recalibrate the instrument. 15 6 · Replace the cap to the cuvet, and shake gently a couple of times. · Place the cuvet with the reacted sample into the holder and ensure that the notch on the cap is positioned securely into the groove. · Hold READ/TIMER for three seconds and the display will show the countdown or, alternatively, wait for two minutes. · Press READ/TIMER and "SIP" will blink during measurement. · The instrument directly displays concentration in mg/L (ppm) of fluoride on the Liquid Crystal Display. Note: For wastewater or seawater samples, before performing measurements, distillation is required. A microprocessor controlled special tungsten lamp emits radiation which is first optically conditioned and beamed to the sample contained in the cuvet. The optical path is fixed by the diameter of 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. Whenever possible use the same cuvet for both. It is necessary that the surface of the cuvet is clean and not scratched. This to avoid measurement interference due to unwanted reflection and absorption of light. It is recommended not to touch the cuvet walls with hands. [. . . ] Please check the preparation of the zero cuvet. "Light High": there is too much light to perform a measurement. Please check the preparation of the zero cuvet. b) on sample reading There is too much light for the sample measurement. [. . . ]