User manual HANNA INSTRUMENTS HI 93728

[. . . ] 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. [. . . ] If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization Number from the Customer Service department and then send it with shipment costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection. To validate your warranty, fill out and return the enclosed warranty card within 14 days from the date of purchase. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments Inc. , Woonsocket, Rhode Island, 02895 , USA. The HI 93728 meter measures the nitrate-nitrogen (NO3­N) content in water and wastewater in the 0. 0 to 30. 0 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 powder form and are supplied 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. Light Emitting Diode @ 555 nm Adaptation of the cadmium reduction method. The reaction between nitratenitrogen and the reagent causes an amber 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. ). V REQUIRED REAGENTS Code HI 93728-0 Description Powder reagent Quantity 1 packet REAGENT SETS HI 93728-01 Reagents for 100 tests HI 93728-03 Reagents for 300 tests Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. OPERATIONAL GUIDE MEASUREMENT PROCEDURE · Turn the meter on by pressing ON/OFF. · When the LCD displays "- - -", it is ready. · Add to the cuvet 6 mL of sample and replace the cap. ON OFF · Reinsert the cuvet into the instrument, taking care not to shake it. · Press READ TIMED and the display will show the countdown prior to the measurement or, alternatively, wait for 4 minutes and 30 seconds and press READ DIRECT. In both cases "SIP" will appear during measurement. 12 9 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. 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. [. . . ] Continue to mix by inverting the cuvet gently and slowly for 50 seconds, while taking care not to induce air bubbles. A deposit could remain but it does not affect the measurement. Time and way of shaking could sensitively affect the measurement. 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. [. . . ]