Instruction Manual HI 9143 • HI 9145 Portable D.O. Meters in Water-Resistant Casing SAM PLE ppm °C ON/O HI 91 Micro 43 Auto processo r Diss Cal o Oxyg lved en M eter FF CAL RAN GE HOL D FAC TOR w w w . h a n n a i n s t .
Dear Customer, Thank you for choosing a HANNA product. Please read this instruction manual carefully before using the instrument. This manual will provide you with the necessary information for a correct use of the instrument. If you need additional technical support, do not hesitate to e-mail us at tech@hannainst.com These instruments are in compliance with the CE directives.
The dissolved oxygen probe is provided with a membrane covering the polarographic sensor elements, and a built-in thermistor for temperature measurement and compensation. The thin permeable membrane isolates the sensor elements from the testing solution, but allows oxygen to enter. When a voltage is applied across the sensor, oxygen that passes through the membrane causes a current to flow from which the oxygen concentration is determined.
PROBE PREPARATION SPECIFICATIONS HI 9143 Range HI 9145 0.00 to 45.00 mg/L O2 0.0 to 300.0% O2 0.0 to 50.0°C Resolution 0.01 mg/L / 0.1% O2 0.1°C Accuracy (@20°C/68°F) ±1.5% FS (O2) ±0.5°C Typical EMC Deviation ±0.3 mg/L / ±3.5% O2 ±0.
CALIBRATION PROBE POLARIZATION The probe is under polarization with a fixed voltage of approximately 800 mV. Probe polarization is essential for stable measurements with the same recurring degree of accuracy. With the probe properly polarized, oxygen is continually "consumed" by passing through the sensitive diaphragm and dissolving in the electrolyte solution contained inside the probe.
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 ensuring that the temperature sensor is also immersed. To display values in % saturation, press RANGE. RANGE For accurate dissolved oxygen measurements, a water movement of at least 30 cm (12”)/sec is required. This is to ensure that oxygen depleted on the membrane surface is constantly replenished. A moving stream will provide adequate circulation.
ALTITUDE COMPENSATION HI 9143 Press FACTOR and “F1” will be displayed. Use the UP and DOWN keys to set the altitude from 0 to 1900 m, in steps of 100 m. SALINITY COMPENSATION HI 9143 Press FACTOR twice and “F2” will be displayed. Press the UP and DOWN keys to set the salinity between 0 and 40 g/L. Press FACTOR again to display the temperature. ppm SAMPLE F1 or HI 9145 With HI 9145, all the DO readings refer to the sea level. Altitude affects the DO concentration by decreasing its value.
PROBE & MEMBRANE MAINTENANCE The oxygen probe body is made of reinforced polypropylene for maximum durability. A built-in thermistor sensor measures the temperature of the sample. It is recommended to keep the protective cap on the probe when the it is not in use. To replace the membrane or refill it with electrolyte, proceed as follows: • Remove the protective cap by gently twisting and pulling it off the probe (fig.1). TWIST • Unscrew the membrane AND by turning it counterclockPULL wise (fig.2) fig.
Use the HANNA adapters (such as HI 710005 or HI 710006) with proper polarity configuration. BATTERY REPLACEMENT When the batteries become weak, the "LOBAT" indication appears on the LCD to warn the operator that the display will be shut-off after about 4 hours of use to prevent erroneous readings due to low voltage. LOBAT SAMPLE ppm °C Battery replacement must only take place in a safe area using 1.5V AA alkaline batteries.
WARRANTY CE DECLARATION OF CONFORMITY All Hanna meters are warranted for two years against defects in workmanship and materials when used for their intended purpose and maintained according to the instructions. Probes are warranted for six months. This warranty is limited to repair or replacement free of charge. Damages due to accidents, misuse, tampering or lack of prescribed maintenance are not covered. If service is required, contact the dealer from whom you purchased the instrument.
SALES & TECHNICAL SERVICE 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. 6296.7118 • Fax 6291.
