Hanna Instruments HI 93707 Instruction Manual

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Hanna Instruments HI 93707 Instruction Manual Manual pdf 2 page image

ONOFFMEASUREMENT PROCEDURE• Turn the meter on bypressing ON/OFF.• When the LCD displays“- - -”, it is ready.• Fill the cuvet up to 1.5 cm(¾”) below the rim with10 mL of unreactedsample, and replace thecap.• Place the cuvet into theholder and ensure that thenotch on the cap ispositioned securely into thegroove.• Press ZERO and “SIP” will appear on the display.• Wait for a few seconds andthe display will show“-0.0-”. Now the meter iszeroed and ready formeasurement.• Remove the cuvet.• Add the content of one packet of HI 93707 Nitrite LRReagent. Replace the cap and shake gently.ZEROREADTIMED123696’READDIRECT• Reinsert the cuvet into theinstrument.• Press READ TIMED and the display will show thecountdown prior to the measurement, or, alternativelywait for 6 minutes and press READ DIRECT. In both cases“SIP” will appear during measurement.• The instrument directly displays concentration in mg/L ofnitrite nitrogen.• To convert the NO2–––––-N concentration to the nitrite ionconcentration (NO 2–––––), multiply the reading by factor of3.29.• To convert the NO2–––––-N concentration to sodium nitriteconcentration (NaNO 2), multiply the reading by factor of4.93.INTERFERENCESInterference may be caused by the following ions:ferrous, ferric, cupric, mercurous, silver, antimonious, bismuth,auric, lead, metavanadate and chloroplatinate.Strongly reducing and oxidizing reagents.High levels of nitrate (above 100 mg/L) could yield falselyhigh readings due to a minute amount of reduction to nitritethat could occur at these levels.The instruction listed below should be carefully followedduring testing to ensure best accuracy.• Do not touch the cuvet walls with hands.• In order to maintain the same conditions during thezeroing and the measuring phases, it is necessary to closethe cuvet to prevent any contamination.• Do not let the test sample stand too long after reagent isadded or accuracy will be lost.• Whenever the cuvet is placed into the measurement cell,it must be completely free of fingerprints, oil or dirt.Wipe it thoroughly with HI 731318 or a lint-free clothprior to insertion.• It is important that the sample does not contain anydebris. This would corrupt the readings.• It is possible to take multiple readings in a row, but it isrecommended that a zero reading be taken for eachsample and that the same cuvet is used for zeroing andmeasurement.• It is important to discard the sample immediately afterthe reading is taken because the glass might becomepermanently stained.• Shaking the cuvet can generate bubbles in the sample,causing higher readings. To obtain accurate measurements,remove such bubbles by swirling or by gently tapping thevial.• All the reaction times reported in this manual are referredto 20°C (68°F). As a general rule of thumb, they shouldbe doubled at 10°C (50°F) and halved at 30°C (86°F).Battery replacement must only take place in a non-hazardousarea using a 9V alkaline battery.Simply slide off the battery cover on the back of the meter.Detach the battery from the terminals and attach a fresh 9Vbattery while paying attention to the correct polarity. Replacethe battery and the cover.9VSLIDEOFFRecommendations for UsersBefore using these products, make sure that they are entirely suitable for the environmentin which they are used.Operation of these instruments in residential area could cause unacceptable interferencesto radio and TV equipments, requiring the operator to take all necessary steps to correctinterferences.Any variation introduced by the user to the supplied equipment may degrade theinstruments' EMC performance.To avoid damages or burns, do not perform any measurement in microwave ovens.REAGENT SETSHI 93707-01 Reagents for 100 testsHI 93707-03 Reagents for 300 testsOTHER ACCESSORIESHI 710009 Blue rubber bootHI 710010 Orange rubber bootHI 721310 9V battery (10 pcs)HI 731318 Tissue for wiping cuvets (4 pcs)HI 731321 Glass cuvets (4 pcs)HI 731325 Caps for cuvets (4 pcs)HI 93703-50 Cuvets cleaning solution (230 mL).Operational Guide Tips for an Accurate Measurement AccessoriesCE Declaration of ConformityBattery ReplacementRead the relevant SDS sheets before performing the test.Safety Data Sheets are available at: www.hannainst.comSafety Data Sheets10 mL

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