User manual HANNA INSTRUMENTS HI 93752

[. . . ] 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. [. . . ] Replace the battery and the cover. 9V SLIDE OFF GENERAL DESCRIPTION The HI 93752 meter measures the calcium content in the 0 to 400 mg/L (ppm) range and the magnesium content in the 0 to 150 mg/L (ppm) range in water and wastewater. 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 @ 470 nm To determine Calcium: Adaptation of the Oxalate method To determine Magnesium: Adaptation of the Calmagite method 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 93752A-0 Ca HI 93752B-0 Ca HI 93752A-0 Mg HI 93752B-0 Mg Description Buffer Reagent Calcium Buffer Reagent Calcium Oxalate Reagent Magnesium Buffer Reagent Magnesium Indicator Reagent Quantity 4 drops 7 mL 1 mL 1 mL 9 mL V OPERATIONAL GUIDE MEASUREMENT PROCEDURE TO DETERMINE CALCIUM · Turn the meter on by pressing ON/OFF. · When the LCD displays "- - -", it is ready. · Select Calcium by pressing Ca/Mg. A "c" will appear on the right corner of the display. · Using the 5 mL syringe add exactly 3. 00 mL of sample to the cuvet. probable level of liquid taken up by syringe ON OFF · Wait for 5 minutes, then invert again the cuvet 10 times and after that reinsert the cuvet into the instrument. · Replace the cap and invert several times to mix. · Reinsert the cuvet into the instrument. · Press READ and SIP will appear on the display. · The instrument directly displays concentration in mg/L of Magnesium on the Liquid Crystal Display. 3 mL of sample · Wait for 10 seconds, press READ and SIP will appear on the display. · The instrument directly displays concentration in mg/L of Calcium on the Liquid Crystal Display. Note: To ensure accurate results, perform the tests at room temperature, between 18°C and 28°C (65F to 83F). would corrupt the readings. · It is possible to take multiple readings in a row, but it is recommended that a zero reading be taken for each sample and that the same cuvet is used for zeroing and measurement. · It is important to discard the sample immediately after the reading is taken because the glass might become permanently 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 the vial. · All the reaction times reported in this manual are referred to 20°C (68°F). As a general rule of thumb, they should be doubled at 10°C (50°F) and halved at 30°C (86°F). Interferences: Acidity (as CaCO3) Alkalinity (as CaCO3) Magnesium (Mg2+) concentration above 1000 mg/L above 1000 mg/L above 400 mg/L reading lower higher higher Interferences: concentration Acidity (as CaCO3) above 1000 mg/L Alkalinity (as CaCO3) above 1000 mg/L Calcium (Ca2+) above 200 mg/L Iron -Aluminum -Copper -reading lower higher higher higher higher higher ACCESSORIES REAGENT SETS HI 93752-01 Reagents for 100 tests OTHER ACCESSORIES HI 710009 Blue rubber boot HI 710010 Orange rubber boot HI 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 740142 1 mL graduated syringe HI 740143 1 mL graduated syringes (6 pcs) HI 740144 Pipette tip (6 pcs) HI 740157 Plastic refilling pipette (20 pcs) HI 93703-50 Cuvets cleaning solution (230 mL) C115-00300 5 mL graduated syringe · Add 4 drops of Buffer Reagent. · Use the pipette to fill the cuvet up to the 10 mL mark with the HI 93752A-0 Ca reagent. [. . . ] · 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 affected. · 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 cloth prior to insertion. [. . . ]