User manual HANNA INSTRUMENTS HI 8731

[. . . ] Temperature ±0. 5°C TDS Factor 0. 5 Calibration EC/TDS Manual, 1 point, through front knob Temperature Factory calibrated Probe HI 761285 (included) Temperature Automatic, 0 to 50°C (32 to 122°F) Compensation with =2%/°C Environment 0 to 50 °C (32 to 122°F); RH max 100% Battery Type / Life 1x9V alkaline / approx. 250 hours Dimensions 164 x 76 x 45 mm (6. 4 x 3. 0 x 1. 8'') Weight 250 g (8. 8 oz. ) (*) If using HI 761285 probe, it is recommended to not exceed 50°C Range PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it carefully. If any damage has occurred during shipment, immediately notify your Dealer or the nearest Hanna Customer Service Center. The meter is supplied with: · HI 761285 conductivity probe with built-in temperature sensor, DIN connector and 1 m (3. 3') cable · HI 70039 (5000 S/cm) calibration solution sachet · HI 70032 (1382 ppm) calibration solution sachet · Battery & instructions Note: Conserve all packing material until the instrument has been observed to function correctly. [. . . ] Any variation introduced by the user to the supplied equipment may degrade the instruments' EMC performance. To avoid electrical shock, do not use this instrument when voltage at the measurement surface exceeds 24 Vac or 60 Vdc. To avoid damage or burns, do not perform any measurement in microwave ovens. All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments. Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. TAKING MEASUREMENTS · The meter is supplied complete with a 9V battery. Remove the battery compartment cover on the back of the meter and install the battery while paying attention to its polarity. · Connect the probe to the DIN socket on the top of the meter by aligning the pins with the socket and pushing in the plug. · Tap the probe lightly on the bottom of the beaker to remove any air bubbles which may be trapped inside. · Select the desired measurement range, by pressing the corresponding key: "S/cm" for EC or "ppm" for TDS. · Wait a couple of minutes for the temperature sensor to reach thermal equilibrium. The display will then show the measurement automatically temperature compensated for temperature with the appropriate indication: "S" symbol indicates the meter is in EC mode, while no symbol means that the meter is in TDS mode. CALIBRATION · Turn the meter on. · Pour a small quantity of HI 70039 (5000 S/cm) EC calibration solution or HI 70032 (1382 ppm) TDS calibration solution into a clean beaker. Note: The conversion factor between EC and TDS readings is made by a built-in circuit. Therefore, it is requested to calibrate only one range (EC or TDS), and the other range will be automatically calibrated. · Immerse the probe in the calibration solution and wait for a couple of minutes for thermal equilibrium to be reached. · Tap the probe on the bottom, then shake it, to make sure no air bubbles remain trapped inside the probe. · Turn the EC/TDS calibration knob until the display shows the calibration solution value. Note: For best accuracy, the probe body should not touch nor stand close to the side walls of the beaker. PROBE MAINTENANCE Periodic Maintenance · Inspect the probe and the cable. The cable used for the connection to the meter must be intact and there must be no points of broken insulation on the cable or cracks on the probe stem or bulb. Cleaning Procedure For better accuracy in measurements and to ensure a good performance of the probe, a frequent cleaning is recommended. · Immerse the tip of the probe in the HI 7061 cleaning solution for half an hour. [. . . ] When the low battery indication appears, only a few hours of working time are left. When the battery level is too low to ensure reliable measurements, the meter turns off. Battery replacement must only take place in a nonhazardous area using a 9V alkaline battery. Unscrew the three screws on the rear of the meter, remove the battery compartment cover and replace the 9V battery with a new one, while paying attention to the correct polarity. [. . . ]