Hach DR 1900 Basic User Manual

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Clean the instrumentClean the exterior of the instrument with a moist cloth and a mild soap solution and then wipe theinstrument dry as necessary.Clean the cell compartmentN O T I C EMake sure there is no sample cell or cell adapter in the cell compartment before this task is started.Turn the instrument and use a rubber suction bulb to blow carefully air into the cell compartment.Clean the sample cellsC A U T I O NChemical exposure hazard. Obey laboratory safety procedures and wear all of the personal protectiveequipment appropriate to the chemicals that are handled. Refer to the current safety data sheets(MSDS/SDS) for safety protocols.C A U T I O NChemical exposure hazard. Dispose of chemicals and wastes in accordance with local, regional andnational regulations.Most laboratory detergents are used at recommended concentrations. Neutral detergents, such asLiquinox, are safer to use when regular cleaning is necessary. To decrease the cleaning times,increase the temperature or use an ultrasonic bath. To complete the cleaning, rinse a few times withdeionized water and then let the sample cell air dry.Sample cells may also be cleaned with acid, followed by a thorough rinse with deionized water.Note: Always use acid to clean sample cells that were used for low-level metal tests.Special cleaning methods are necessary for individual procedures. When a brush is used to cleansample cells, take extra care to avoid scratches on the interior surfaces of the sample cells.Replace the batteriesW A R N I N GExplosion hazard. Expired batteries can cause hydrogen gas buildup inside the instrument. Replacethe batteries before they expire and do not store the instrument for long periods with the batteriesinstalled.Refer to Install the batteries on page 7 for battery replacement.TroubleshootingProblem Possible cause SolutionAbsorbance > 3.5! The measured absorbance is more than 3.5. Dilute the sample and repeat thereading.Over range! The concentration is more than the upper limitof the current method.Dilute the sample and repeat thereading.Under range! The concentration is less than the lower limit ofthe current method.Examine the sample.Reading Failed! There is an electronic or optical defect. Contact technical support.English 15