User manual HANNA INSTRUMENTS HI 93735

[. . . ] A flashing value lower than the minimum concentration readable (see specifications) indicates that the sample absorbs less light than the zero reference. Check the procedure and make sure you use the same cuvet for reference (zero) and measurement. 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. [. . . ] Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments Inc. , Woonsocket, Rhode Island, 02895 , USA. Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. The HI 93735 meter measures the total hardness in drinking, surface 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 and powder form and are supplied in bottles and in 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. REQUIRED REAGENTS: Code HI 93735A-LR HI 93735A-MR HI 93735A-HR HI93735B HI93735C Description Hardness Indicator reagent LR Hardness Indicator reagent MR Hardness Indicator reagent HR Hardness Buffer reagent Fixing Reagent Quantity 9. 5mL/test 9. 5mL/test 9. 5mL/test 2 drops 1 packet OPERATIONAL GUIDE MEASUREMENT PROCEDURE · Turn the meter on by pressing ON/OFF. · When the LCD displays "SCL", it is ready. · The meter automatically defaults to Hardness Low Range (LR) measurement mode, with the "HARDNESS" and "LR" indications appearing on the LCD. Press the "RANGE" key to select the Medium Range (MR) or the High Range (HR) if needed. If the "RANGE" key is pressed while in HR mode, the meter returns to LR range. ON OFF · Press "ZERO/READ". The display will show a countdown prior to measurement. During measurement the "bLn" indication will be shown, then "-0-" will appear. INTERFERENCES Interference may be caused by: Excessive amounts of heavy metals Note: if the sample is very acidic, some extra drops of HI93735B buffer reagent may be added. HI 93735LR HI 93735MR HI 93735HR HI 93735-0 ACCESSORIES REAGENT SETS Reagents for 100 tests LR (0 to 250 ppm) Reagents for 100 tests MR (200 to 500 ppm) Reagents for 100 tests HR (400 to 750 ppm) Reagents for 100 tests (0 to 750 ppm) TIPS FOR AN ACCURATE MEASUREMENT · Remove the cuvet and add the content of 1 packet of HI93735C fixing reagent. · Replace the cap and shake gently to mix. · Reinsert the cuvet into the holder and ensure that the notch on the cap is positioned securely into the groove. The display will show a countdown prior to measurement. During measurement the "SIP" indication will be displayed. The instruction listed below should be carefully followed during testing to ensure best accuracy. · Do not touch the cuvet walls with hands. [. . . ] · Add 2 drops of HI93735B buffer reagent. · Replace the cap and shake gently to mix. · Place the cuvet into the holder and ensure that the notch on the cap is positioned securely into the groove. CE DECLARATION OF CONFORMITY · The instrument directly displays the hardness in ppm of CaCO3 on the Liquid Crystal Display. · Press the "UNIT" key repeatedly to have the reading converted in °f, °D and °E respectively. BATTERY REPLACEMENT Battery replacement must only take place in a non-hazardous area using a 9V alkaline battery. Simply slide off the battery cover on the back of the meter. [. . . ]