Hanna Instruments HI 83203 Instruction Manual

16 17• Remove the cuvette.• Add 4 drops of HI 93715A-0 First reagent (6 drops for seawateranalysis). Replace the cap and mix the solution.• Add 4 drops of HI 93715B-0 Second reagent (10 drops for seawateranalysis). Replace the cap and mix the solution.• Reinsert the cuvette into the instrument.• Press TIMER and the display will show the countdown prior to themeasurement or, alternatively, wait for 3 minutes and 30 seconds and pressREAD. When the timer ends the meter will perform the reading. Theinstrument displays the results in mg/L of ammonia nitrogen (NH3-N).• Press the V or W to access the second level of functions.• Press the Chem Frm functional key to convert the result in mg/L of ammonia (NH3) and ammonium (NH4+).• Press the V or W to go back to the measurement screen.INTERFERENCESInterference may be caused by:acetone, alcohols, aldehydes, glycine, hardness above 1 g/L, iron, organic chloramines, sulfide, variousaliphatic and aromatic amines.Ammonia MRx 4x 4Ammonia MRSPECIFICATIONSRange 0.00 to 10.00 mg/LResolution 0.01 mg/LAccuracy ±0.05 mg/L ±5% of readingTypical EMC ±0.01 mg/LDeviationLight Source Tungsten lamp with narrow band interference filter @ 420 nmMethod Adaptation of theASTM Manual of Water and Environmental Technology, D1426-92,Nessler method. The reaction between ammonia and reagents causes a yellow tint inthe sample.REQUIRED REAGENTSCode Description QuantityHI 93715A-0 First Reagent 4 drops (6 drops for seawater)HI 93715B-0 Second Reagent 4 drops (10 drops for seawater)REAGENT SETSHI 93715-01 Reagents for 100 testsHI 93715-03 Reagents for 300 testsFor other accessories see page 46.MEASUREMENT PROCEDURE• Select theAmmonia MR method using the procedure described intheMethod Selection section (see page 11).• Fill the cuvette with 10 mL of unreacted sample (up to the mark)and replace the cap.• Place the cuvette into the holder and close the lid.• Press ZERO key. The display will show “-0.0-” when the meter iszeroed and ready for measurement.AMMONIA MEDIUM RANGE