Instruction Manual HI 8043 Portable Dissolved Oxygen Meter DO me ter HI 804 3 STB °C OFF O2 ZERO SLOPE °C ins rum 1 ns
PRELIMINARY EXAMINATION Dear Customer, Thank you for choosing a Hanna Instruments Product. Please read this instruction manual carefully before using the instrument. This manual will provide you with all the necessary information for the correct use of the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com This instrument is in compliance with the CE directives.
The thin permeable membrane isolates the sensor elements from the sample, but allows oxygen to enter. A voltage is applied across the sensor, and the oxygen that has passed through the membrane reacts causing the current to flow, hence determining a reading. A convenient feature of the instrument is its standby mode which keeps the probe polarized and ready for instant measurements.
SPECIFICATIONS Range 0.00 to 19.99 mg/L O2 0.0 to 50.0°C (32 to 122 °F) Resolution 0.01 mg/L O2 0.1°C Accuracy ±1.5% F.S. (O 2) ±0.5°C Typical EMC Deviation ±1.5% F.S. (O 2) ±1°C Calibration Manual, 2 point (zero and slope) Temperature Compensation Probe Automatic, 0 to 30°C (32 to 86°F) HI 76401 polarographic with 3 m (10') cable (included) Battery Type 1 x 9V Life approx. 100 hours of continuous use Environment 0 to 50°C (32 to 122°F); RH max 95% Dimensions 180 x 83 x 40 mm (7.1 x 3.3 x 1.
PROBE POLARIZATION When the probe is under polarization it is continuously fed with a voltage of approximately 800 mV. Probe polarization is essential for stable measurements to be taken with the same degree of accuracy. With polarized probe, oxygen is continually "consumed" by passing through the sensitive diaphragm and dissolving in the electrolyte solution contained in the probe.
• Using a small screwdriver, turn the "Zero" calibration trimmer until the display reads zero. E.g. at 20.5°C the trimmer should be adjusted to read 9.08. ZERO ZERO SLOPE SLOPE °C °C • If the zero point is passed, "1" will appear on the display. If you cannot get zero reading, the probe is probably defective. Check the membrane, electrode and electrolyte solution. After the zero calibration has been completed, rinse the probe thoroughly with tap water.
Table 1 Dissolved Oxygen (ppm) in Fresh Water as a function of Temperature (°C) °C 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 0.0 14.62 14.23 13.84 13.48 13.13 12.80 12.48 12.17 11.87 11.59 11.33 11.08 10.83 10.60 10.37 10.15 9.95 9.74 9.54 9.35 9.17 8.99 8.83 8.68 8.53 8.38 8.22 8.07 7.92 7.77 7.63 7.50 7.40 7.30 7.20 7.10 7.00 6.90 6.80 6.70 6.60 6.50 6.40 6.30 6.20 6.10 6.00 5.90 5.80 5.70 5.60 0.1 14.
Table 3 Correction for salinity effect °C 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Quantity to be °C subtracted per mg/l of NaCl 0.0892 0.0861 0.0830 0.0802 0.0779 0.0749 0.0724 0.0701 0.0678 0.0657 0.0637 0.0618 0.0599 0.0582 0.0565 0.0549 0.0533 0.0519 0.0505 0.0491 0.0478 0.0466 0.0454 0.0442 0.0431 0.0421 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Quantity to be subtracted per mg/l of NaCl 0.0410 0.0400 0.0391 0.0382 0.0373 0.0364 0.0356 0.
TAKING MEASUREMENTS Make sure the meter has been calibrated and the protective cap has been removed. Immerse the tip of the probe in the sample to be tested. For accurate dissolved oxygen measurements a water movement of at least 0.3 m/sec is required. This movement will ensure that the oxygendepleted membrane surface is constantly replenished. A moving stream will provide adequate circulation. To quickly check if the water speed is sufficient, wait for stable reading and then move the D.O. probe.
• With the sensor facing down, screw the membrane cap clockwise. Some electrolyte will overflow. The Platinum cathode (#8 in the Functional Description at page 4) should always be bright and untarnished. If it is tarnished or stained, which could be due to contact with certain gases or extended use with a loose or damaged membrane, the cathode should be cleaned. Use a lint-free cardboard or cloth and rub the cathode very gently side to side 4-5 times.
ACCESSORIES HI 7040M Zero oxygen solution, 230 mL HI 7040L Zero oxygen solution, 500 mL HI 7041S Refilling electrolyte solution, 30 mL HI 710001 Soft carrying case HI 710009 Shockproof rubber boot, blue HI 710010 Shockproof rubber boot, orange HI 76401 D.O.
CE DECLARATION OF CONFORMITY Recommendations for Users Before using this product, make sure that it is entirely suitable for the environment in which it is used. Operation of this instrument in residential area could cause unacceptable interferences to radio and TV equipments, requiring the operator to take all necessary steps to correct interferences. Any variation introduced by the user to the supplied equipment may degrade the instrument's EMC performance.
SALES AND TECHNICAL SERVICE CONTACTS Australia: Tel. (03) 9769.0666 • Fax (03) 9769.0699 China: Tel. (10) 88570068 • Fax (10) 88570060 Egypt: Tel. & Fax (02) 2758.683 Germany: Tel. (07851) 9129-0 • Fax (07851) 9129-99 Greece: Tel. (210) 823.5192 • Fax (210) 884.0210 Indonesia: Tel. (21) 4584.2941 • Fax (21) 4584.2942 Japan: Tel. (03) 3258.9565 • Fax (03) 3258.9567 Korea: Tel. (02) 2278.5147 • Fax (02) 2264.1729 Malaysia: Tel. (603) 5638.9940 • Fax (603) 5638.9829 Singapore: Tel. 6296.
