Hanna Instruments HI 95721C Instruction Manual

Contents

9This prompt appears for 1 second each time the instrument is turnedon.This indicates that the meter is in a ready state and zeroing can beperformed.Sampling in Progress. This flashing prompt appears each time themeter is performing a measurement.This indicates that the meter is in a zeroed state and measurementcan be performed.Light over range: the cuvet is not inserted correctly and an excessambient light is reaching the detector. If the cover is properly installed,then contact your dealer or the nearest Hanna Customer ServiceCenter.The blinking "BAT" indicates that the battery voltage is getting lowand the battery needs to be replaced.This indicates that the battery is dead and must be replaced. Oncethis indication is displayed, the meter will lock up. Change thebattery and restart.“Configuration”: this indicates that the meter has lost its configuration.Contact your dealer or the nearest Hanna Customer Service Center.CALIBRATION MODE MESSAGESThe date of the last calibration appears on the LCD each time thecalibration mode is entered. If calibration is performed for the firsttime, “F.CAL” appears.This indicates that the factory calibration is selected.GUIDE TO DISPLAY CODES12• It is important that the sample does not contain anydebris. This would corrupt the reading.• Each time the cuvet is used, the cap must betightened to the same degree.• Whenever the cuvet is placed into the measurementcell, it must be dry outside, and completely free offingerprints, oil or dirt. Wipe it thoroughly withHI 731318 (tissue for wiping cuvets, see chapterACCESSORIES) or a lint-free cloth prior to insertion.• Shaking the cuvet can generate bubbles in thesample, causing higher readings. To obtain accuratemeasurements, remove such bubbles by swirling orby gently tapping the vial.• Do not let the reacted sample stand too long afterreagent is added, or accuracy will be lost.• It is possible to take multiple readings in a row, butit is recommended to take a new zero reading foreach sample and to use the same cuvet for zeroingand measurement.• After the reading it is important to discardimmediately the sample, otherwise the glass mightbecome permanently stained.• All the reaction times reported in this manual arereferred to 20°C (68°F). As a general rule of thumb,they should be doubled at 10°C (50°F) and halvedat 30°C (86°F).• In order to maximize accuracy, prior to ameasurement follow the validation procedure tobe sure that the instrument is properly calibrated. Ifnecessary, calibrate the instrument.

/ 10

Related manuals for Hanna Instruments HI 95721C