User manual HANNA INSTRUMENTS HI 93734

[. . . ] 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. General Description The HI 93734 meter measures the Free and Total Chlorine (Cl2) content in water and wastewater. The meter uses an exclusive positive-locking system to ensure that the cuvet is in the same position every time it is placed into the measurement cell. The reagents are in powder and liquid form and are supplied in bottles and powder packets. 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 EPA recommended DPD method 330. 5. The reaction between the chlorine and the DPD reagent causes a pink 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 Description HI 93701-0 Free Chlorine Reagent HI 93734B-0 Free & Total Chlorine Reagent B HI 93734C-0 Total Chlorine Reagent C (for Total Chlorine only) Quantity 1 packet 5 mL 3 drops The "V" indicates that the battery voltage is getting low and the battery needs to be replaced. This indicates that the battery is dead and must be replaced. Note: once this indication is displayed, the meter will lockup. Change the battery to restart. REAGENT SETS HI 93734-01 Reagents for 100 Free & Total Chlorine tests HI 93734-03 Reagents for 300 Free & Total Chlorine tests Operational Guide MEASUREMENT PROCEDURE · Turn the meter on by pressing ON/OFF. ON OFF Note: rinse the 3 mL plastic pipette 2 or 3 times with sample before adding it to the cuvet with reagent. · Replace the cap and shake gently. · The instrument directly displays concentration in mg/L (ppm) of Free or Total Chlorine on the Liquid Crystal Display. Note: Free and Total Chlorine have to be measured separately with fresh unreacted samples following the above procedure if both values are requested. · When the LCD displays "- - -", it is ready. · Select Free or Total FREE Chlorine by pressing TOTAL FREE/TOTAL. An "I" or a "C" will appear on the right corner to indicate Free or Total Chlorine, respectively. · Place the cuvet into the holder and ensure that the notch on the cap is positioned securely into the groove. · Press ZERO and "SIP" will blink on the display. ZERO INTERFERENCES Interference may be caused by: Bromine, Iodine, Fluorine, Ozone, Oxidized Manganese and Chromium. Alkalinity above 250 mg/L or acidity above 150 mg/L will not reliably develop the full amount of color or it may rapidly fade. To resolve this, neutralize the sample with diluted HCl or NaOH. In case of water with hardness greater than 1000 mg/L CaCO3, shake the sample for approximately 1 minute after adding the powder reagent. 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. [. . . ] · 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. Wipe it thoroughly with HI 731318 or a lint-free cloth prior to insertion. · It is important that the sample does not contain any debris. [. . . ]