User manual HANNA INSTRUMENTS HI 95706

[. . . ] Instruction Manual HI 95706C Phosphorus ISM MAN95706R2 06/06 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 20 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. 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. [. . . ] The meter is now zeroed and ready for calibration. · Place the CAL CHECKTM Standard HI 95706-11 Cuvet B into the holder and ensure that the notch on the cap is positioned securely into the groove. SPECIFICATIONS Range Resolution Precision Typical EMC Deviation Light Source Light Detector Method 0. 0 to 15. 0 mg/L 0. 1 mg/L ±0. 2 mg/L @ 6. 0 mg/L ±0. 2 mg/L Tungsten lamp with narrow band interference filter @ 525 nm Silicon Photocell Amino Acid Method, adapted from Standard Method for the Examination of Water and Wastewater. The reaction between phosphorus and the reagents causes a blue tint in the sample. 0 to 50°C (32 to 122°F); max 95% RH non-condensing 1 x 9 volt After 10' of non-use in measurement mode; after 1 hour of non-use in calibration mode. 180 x 83 x 46 mm (7. 1 x 3. 3 x 1. 8") 290 g (10 oz. ). Environment Battery Type Auto-Shut off or Dimensions Weight REQUIRED REAGENTS Code HI 93706A-0 HI 93706B-0 Description Phosphorus Reagent A Phosphorus Reagent B Quantity/test 10 drops 1 packet PRECISION AND ACCURACY Precision is how closely repeated measurements agree with each other. Precision is usually expressed as standard deviation (SD). Accuracy is defined as the nearness of a test result to the true value. Although good precision suggests good accuracy, precise results can be inaccurate. In a laboratory using a standard solution of 6. 00 mg/L phosphorus and a representative lot of reagents, an operator obtained with a single instrument a standard deviation of 0. 2 mg/L. 5 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 pure absorption occurs, the fraction of light absorbed depends both on the optical path length through the matter and on the physical-chemical characteristics of the substance according to the Lambert-Beer Law: -log I/Io = c d or A = c d Where: -log I/Io Io I c d = = = = = = Absorbance (A) intensity of incident light beam intensity of light beam after absorption molar extinction coefficient at wavelength molar concentration of the substance optical path through the substance VALIDATION PROCEDURE Use the validation procedure to ensure that the instrument is properly calibrated. · Hold READ/TIMER for three seconds. The display will show the countdown prior to measurement. Alternatively, wait for 5 minutes and just press READ/TIMER. In both cases "SIP" will blink during measurement. · The instrument directly displays concentration in mg/L of phosphorus on the Liquid Crystal Display. INTERFERENCES · Calcium (Ca2+): · Chloride (Cl ): - or above 10, 000 mg/L as CaCO3. above 40, 000 mg/L as CaCO3. 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 Io or I. The photoelectric cell collects the radiation I that is not absorbed by the sample and converts it into an electric current, producing a potential in the mV range. [. . . ] "No Light": the instrument cannot adjust the light level. Please check that the sample does not contain any debris. "Light Low": there is not enough light to perform a measurement. Please check the preparation of the zero cuvet. [. . . ]