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. 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. [. . . ] · 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 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. 180 x 83 x 46 mm (7. 1 x 3. 3 x 1. 8") 290 g (10 oz. ). Description Total Chlorine LR Reagent Quantity/test 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 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. In both cases "SIP" will blink during measurement. · 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). To resolve this, neutralize the sample with diluted HCl. May not reliably develop the full amount of color or it may rapidly fade (negative error). [. . . ] This indicates that the factory calibration is selected. 12 9 The flashing digits indicate that: 1) the month can be set 2) the day can be set "Storage": this prompt appears for 1 second at the end of the calibration procedure, to indicate that the calibration data has been stored. "Error": the concentration of the calibration solution used is not correct. Repeat the calibration procedure with the right standard solution, and verify it is not expired. If the calibration procedure fails again, contact your dealer or the nearest Hanna Customer Service Center. [. . . ]