User manual HANNA INSTRUMENTS HI 95734

[. . . ] Instruction Manual HI 95734C Free & Total Chlorine High Range ISM MAN95734R3 07/06 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 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. 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. [. . . ] 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. Furthermore, in order to maintain the same conditions during the zeroing and the measuring phases, it is necessary to close the cuvet to prevent any contamination. · 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 95734-11 Cuvet B into the holder and ensure that the notch on the cap is positioned securely into the groove. 18 7 FUNCTIONAL DESCRIPTION VALIDATION PROCEDURE Use the validation procedure to ensure that the instrument is properly calibrated. Warning: do not validate or calibrate the instrument with standard solutions other than the Hanna CAL CHECKTM Standards, otherwise erroneous results will be obtained. For accurate Validation and Calibration results, please perform test at room temperature: 18 to 25°C (64. 5 to 77. 0°F). Temperature correction for Validation: corrected value = read value × [1 + 0. 002 × (20 - T(°C))] corrected value = read value × [1 + 0. 001 × (68 - T(°F))] 1) 2) 3) 4) 5) 6) 7) Liquid Crystal Display (LCD) Cuvet Holder Cuvet alignment indicator ON/OFF key ZERO/SET key READ/TIMER key CAL CHECK key · Select the parameter code for free chlorine "734f" or total chlorine "734t" by holding ZERO/SET (see page 14). · Place the CAL CHECKTM Standard Cuvet A into the holder and ensure that the notch on the cap is positioned securely into the groove. · 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 validation. · Place the CAL CHECKTM Standard HI 95734-11 Cuvet B into the holder and ensure that the notch on the cap is positioned securely into the groove. · Press CAL CHECK and "SIP" will blink during measurement. · Wait for a few seconds and the display will show the validation standard value. The reading should be within specifications as reported on the CAL CHECKTM Standard Certificate. If the value is found 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. KEYPAD DESCRIPTION · ON/OFF: to turn the meter on and off. · ZERO/SET: this is a bi-functional key: press to zero the meter prior to measurement, or hold the key for 3 seconds to select the desired parameter (free or total chlorine). [. . . ] Check the procedure and make sure you use the same cuvet for reference (zero) and measurement. A flashing value of the maximum concentration indicates an over range condition. The concentration of the sample is beyond the programmed range: dilute the sample and re-run the test. A flashing value lower than the maximum concentration indicates a low signal-to-noise ratio condition. [. . . ]