User manual HANNA INSTRUMENTS HI 95761

[. . . ] Instruction Manual HI 95761C Total Chlorine Meter for the analysis of trace Total Chlorine concentrations MAN95761R2 05/06 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. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. This instrument is in compliance with directives. CE DECLARATION OF CONFORMITY Recommendations for Users Before using these products, make sure that they are entirely suitable for your specific application and for the environment in which they are used. [. . . ] · Enter the calibration mode by holding CAL CHECK for three seconds. · The date of the last calibration appears (e. g. : month "01", day "08"). Note: at this point it is possible to reset the instrument to restore FACTORY CALIBRATION, see instructions page 18. · Place the CAL CHECKTM Standard Cuvet A into the holder and ensure that the notch on the cap is positioned securely into the groove. · Place the CAL CHECKTM Standard HI 95761-11 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 Environment Battery Type Auto-Shut off or Dimensions Weight REQUIRED REAGENTS Code HI 95761-0 0. 000 to 0. 500 mg/L 0. 001 mg/L ±0. 004 mg/L @ 0. 200 mg/L ±0. 001 mg/L Tungsten lamp with narrow band interference filter @ 525 nm Silicon Photocell Adaptation of the USEPA METHOD 330. 5. The reaction between the chlorine and the DPD reagent causes a pink 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. Description Total Chlorine LR Reagent Quantity/test 1 packet PRECISION AND ACCURACY Precision is how closely repeated measurements agree with each other. 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 0. 200 mg/L chlorine and a representative lot of reagent, an operator obtained with a single instrument a standard deviation of 0. 004 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. Alternatively, wait for 2 minutes and 30 seconds and just press READ/TIMER. · The instrument directly displays concentration in mg/L of total chlorine on the Liquid Crystal Display. INTERFERENCES · Alkalinity: or above 1, 000 mg/L CaCO3 if present as bicarbonate (HCO3-, sample pH < 8. 3); above 250 mg/L CaCO3 if present as carbonate (CO32-, sample pH > 9. 0). In both cases, it will not reliably develop the full amount of color or it may rapidly fade (negative error). May not reliably develop the full amount of color or it may rapidly fade (negative error). in case of water with hardness greater than 500 mg/L CaCO3, shake the sample for approximately 2 minutes after adding the powder reagent. positive error. 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 Io or I. [. . . ] 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. Light over range: the cuvet is not inserted correctly and an excess ambient light is reaching the detector. If the cover is properly installed, then contact your dealer or the nearest Hanna Customer Service Center. [. . . ]