User manual HANNA INSTRUMENTS HI 93719

[. . . ] A flashing value higher than the maximum concentration readable (see specifications) indicates that the sample absorbs too much light, meaning that the concentration is too high. The cuvet is not inserted correctly and an excess ambient light is reaching the detector. If the cover is properly installed, then contact your dealer or the nearest Hanna Customer Service Center. The zero sample is too dark for proper zeroing. [. . . ] Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. The HI 93719 meter measures the magnesium hardness content, as CaCO3, in water and wastewater in the 0. 00 to 2. 00 mg/L (ppm) range. The meter uses an exclusive positive-locking system to ensure that the cuvet is in the same place every time it is placed into the measurement cell. The reagents are in liquid form and are supplied in bottles. The amount of reagent is precisely dosed to ensure maximum repeatability. Display codes aid the user in routine operations. The meters have an auto-shut off feature that will turn the instrument off after 10 minutes of non-use. Light Emitting Diode @ 555 nm Adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th edition, EDTA colorimetric method. The reaction between Mg and reagents causes a violet tint in the sample Light Detector Silicon Photocell Environment 0 to 50°C (32 to 122°F); max 95% RH non-condensing Battery Type/Life 1 x 9 volt/40 hours Auto-Shut off After 10' of non-use Dimensions 180 x 83 x 46 mm (7. 1 x 3. 3 x 1. 8") Weight 290 g (10 oz. ). REQUIRED REAGENTS Code HI 93719A-0 HI 93719B-0 HI 93719C-0 HI 93719D-0 Description Mg indicator Alkali solution EDTA solution EGTA solution Quantity 0. 5 mL 0. 5 mL 1 drop 1 drop V REAGENT SETS HI 93719-01 Reagents for 100 tests HI 93719-03 Reagents for 300 tests OPERATIONAL GUIDE MEASUREMENT PROCEDURE · Turn the meter on by pressing ON/OFF. · When the LCD displays "- - -", it is ready. · Fill a graduated beaker to the 50 mL mark with the sample. · Add 0. 5 mL of HI 93719A Magnesium indicator solution, then swirl to mix. · Add 0. 5 mL of HI 93719B Alkali solution for Magnesium, then swirl to mix. · Fill two cuvets up to 1. 5 cm (¾") below the rim with 10 mL of sample each. ON OFF · Wait for a few seconds and the display will show "-0. 0-". Now the meter is zeroed and ready for measurement. · Remove the blank and insert the sample into the instrument, making sure that the notch on the cap is positioned securely into the groove. · Press READ TIMED and the display will show the countdown prior to the measurement. Alternatively wait for exactly 30 seconds and press READ DIRECT. In both cases "SIP" will appear during measurement. of the sample is the reading obtained multiplied by a factor of one hundred (the dilution factor). For your reference, factors to convert readings in mg/L to French degrees (FD), German degrees (DD) and English degrees (ED) of hardness are as follows: 1 mg/L = 0. 1 FD = 0. 056 DD = 0. 07 ED. ACCESSORIES REAGENT SETS HI 93719-01 Reagents for 100 tests HI 93719-03 Reagents for 300 tests INTERFERENCES Interference may be caused by excessive amounts of heavy metals. OTHER ACCESSORIES HI 710009 HI 710010 HI 721310 HI 731318 HI 731321 HI 731325 HI 93703-50 Blue rubber boot Orange rubber boot 9V battery (10 pcs) Tissue for wiping cuvets (4 pcs) Glass cuvets (4 pcs) Caps for cuvets (4 pcs) Cuvets cleaning solution (230 mL). A TIPS FOR AN ACCURATE MEASUREMENT The instruction listed below should be carefully followed during testing to ensure best accuracy. · Do not touch the cuvet walls with hands. · In order to maintain the same conditions during the zeroing and the measuring phases, it is necessary to close the cuvet to prevent any contamination. · Do not let the test sample stand too long after reagent is added or accuracy will be lost. · Whenever the cuvet is placed into the measurement cell, it must be completely free of fingerprints, oil or dirt. [. . . ] A dilution to reduce the level of hardness by a factor of one hundred is performed as follows: · Fill a 1 mL syringe with the sample. · Place the syringe in a 50 mL beaker, making sure that the beaker is clean and empty, and inject 0. 5 mL into the beaker. · Fill the beaker up to the 50 mL mark with hardness-free water. Now, follow normal measurement procedure. [. . . ]