User manual HANNA INSTRUMENTS HI 83215

[. . . ] Instruction Manual HI 83215 Grow Master Basic for Nutrient Analyses www. hannainst. com 1 Dear Customer, Thank you for choosing a Hanna product. Please read this instruction manual carefully before using the instrument. This manual will provide you with the necessary information for the correct use of the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. TABLE OF CONTENTS PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] To prevent the displacement of the settled solids at the bottom of the beaker, do not induce air bubbles into the solution. IRRIGATION WATER (LR): · Measure 100 mL of sample with the graduated cylinder. · If the solution contains some turbidity or color, pour it in the large 170 mL beaker and add a powder packet of active carbon. · Mix well using the spoon and then wait for 5 minutes. 19 · Fold a filter disc twice as shown in the figure. Separate one side from the other three to form a cone. Insert the folded filter disc in the funnel. · Filter the treated sample into an empty beaker. The sample is now ready. Note: Filter at least 40 mL of solution if all the four methods will be tested. If the solution is still turbid or colored, treat it again with a packet of active carbon. After use, throw the filter disc away and wash the syringe and the filter assembly well. Always use a new disc for another sample. NUTRIENTS SOLUTION (MR): · Use the graduated cylinder to measure exactly 20 mL of sample. · Remove the cap and fill the Demineralizer Bottle with tap water. 20 · Replace the cap and shake gently for at least 2 minutes. · Open the upper part of the Demineralizer Bottle cap and gently squirt the demineralized water into the cylinder, up to the 100 mL mark. Note: The ion exchange resin contained in the Demineralizer Bottle is provided with an indicator substance. The indicator will change from green to blue when the resin has been exhausted and needs to be replaced. · Pour the solution in the large 170 mL beaker, replace the cap and invert several times to mix. · If the solution contains some turbidity or color, add a powder packet of active carbon and follow the procedure described for Irrigation Water (LR). NUTRIENTS SOLUTION (HR): · Add 10 mL of sample to the graduated cylinder using the 5 mL syringe (twice). 21 Note: To measure exactly 5 mL of sample with the syringe, push the plunger completely into the syringe and insert the tip into the sample. Pull the plunger out until the lower edge of the seal is on the 5 mL mark of the syringe. · Remove the cap and fill the Demineralizer Bottle with tap water. · Replace the cap and shake gently for at least 2 minutes. · Open the upper part of the Demineralizer Bottle cap and squirt gently the demineralized water into the cylinder, up to the 100 mL mark. · Pour the solution in the large 170 mL beaker, replace the cap and invert several times to mix. · If the solution contains some turbidity or color, add a powder packet of active carbon and follow the procedure described for Irrigation Water (LR). 22 AMMONIA HIGH RANGE SPECIFICATIONS Range Resolution Accuracy Typical EMC Deviation Light Source Method 0 to 100 mg/L 1 mg/L ±1 mg/L ±4% of reading at 25 °C ±1 mg/L Tungsten lamp with narrow band interference filter @ 420 nm Adaptation of the ASTM Manual of Water and Environmental Technology, D1426-92, Nessler method. The reaction between ammonia and reagents causes a yellow tint in the sample. Description Quantity First Reagent 4 drops (6 drops for seawater) Second Reagent 4 drops (10 drops for seawater) REQUIRED REAGENTS Code HI 93715A-0 HI 93715B-0 REAGENT SETS HI 93715-01 Reagents for 100 tests HI 93715-03 Reagents for 300 tests For other accessories see page 50. MEASUREMENT PROCEDURE Note: for sample preparation follow the NUTRIENTS SOLUTION (HR) procedure at page 21. · Select the Ammonia HR method using the procedure described in the Method Selection section (see page 12). · 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. The display will show "-0. 0-" when the meter is zeroed and ready for measurement. 10 mL 23 Ammonia HR · Remove the cuvette. · Add 4 drops of HI 93715A-0 First Reagent (6 drops for seawater analysis). Replace the cap and mix the solution by inverting the cuvette a couple of times. · Add 4 drops of HI 93715B-0 Second Reagent (10 drops for seawater analysis). [. . . ] When the timer ends the meter will perform the reading. The instrument displays the results in mg/L (ppm) of potassium (K). · Press or to access the second level functions. · Press the Chem Frm key to convert the result in mg/L of potassium oxide (K2O). · Press or to return to the measurement screen. INTERFERENCES Interferences may be caused by: Ammonium above 10 ppm Calcium above 10000 ppm as CaCO3 Chloride above 12000 ppm Magnesium above 8000 ppm as CaCO3 Sodium above 8000 ppm 47 Potassium LR ERRORS AND WARNINGS The instrument shows clear warning messages when erroneous conditions appear and when measured values are outside the expected range. No Light: The light source is not functioning properly. Light Leak: There is an excess amount of ambient light reaching the detector. Inverted cuvettes: The sample and the zero cuvettes are inverted. Battery Low: The battery capacity is lower than 10%. Light Low: The instrument cannot adjust the light level. [. . . ]