Instruction Manual HI 9142 Portable Waterproof Dissolved Oxygen Meter This instrument is in Compliance with the CE Directives http://www.hannainst.
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, as well as a precise idea of its versatility in a wide range of applications. This instrument is in compliance with tives EN 50081-1 and 50082-1. direc- TABLE OF CONTENTS Preliminary Examination ............................. 1 General Description ..................
in thermistor for temperature measurements 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 has passed through the membrane reacts causing current to flow, allowing the determination of oxygen. FUNCTIONAL DESCRIPTION FUNCTIONAL DESCRIPTION PROBE 3 1 4 6 7 8 4 9 5 6 2 7 8 9 1. D.O. Probe 2. Protective Cap 3. Water-tight Shielded Cable 4.
SPECIFICATIONS HI 9142 Range 0.0 to 19.9 mg/l Resolution Accuracy Typical EMC Deviation Calibration 0.1 mg/l ±1.5% Full Scale ±0.8 mg/l with 4 m cable probe Manual on 2 points (zero and slope) Temperature Compensation Automatic from 0 to 30°C (32 to 86°F) Probe HI 76407/4 polarographic with 4 m cable Battery Type Life 4 x 1.5V AA 500 hours of continuous use Environment 0 to 50°C (32 to 122°F); 100% RH Dimensions 196x80x60 mm (7.7x3.1x2.4") Weight 425 g (15 oz.); kit: 1.4 kg (3.
CALIBRATION PROCEDURE 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 in the probe.
ALTITUDE & SALINITY COMPENSATION 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. If the sample contains salts or if you are performing the measurements at a different altitude than sea level, the readout values must be corrected, taking into account the lower degree of oxygen solubility. Make sure the temperature sensor is also immersed.
SALINITY COMPENSATION The table below shows the influence of salt in the measurement of oxygen. In HI 9142 all the readouts are referred to 0 g/l of salinity value. In fact, salinity affects D.O. concentration decreasing its value. For your reference the table below reports the oxygen solubility at various temperatures and salinity. From the table you can calculate the quantity to be subtracted to correct your reading.
• • Make sure that the rubber O-ring is seated properly inside the membrane cap. With the sensor facing down, screw the membrane cap clock-wise. 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. You can use a clean lint-free cardboard or cloth.
ACCESSORIES HI 7040M Zero Oxygen calibration solution, 230 mL HI 7040L Zero Oxygen calibration solution, 460 mL HI 7041S Refilling Electrolyte solution, 30 mL HI 721308 1.
OTHER PRODUCTS FROM HANNA CE DECLARATION OF CONFORMITY • CALIBRATION AND MAINTENANCE SOLUTIONS • CHEMICAL TEST KITS • CHLORINE METERS • CONDUCTIVITY/TDS METERS • DISSOLVED OXYGEN METERS • HYGROMETERS • ION SPECIFIC METERS (Colorimeters) • MAGNETIC STIRRERS • pH/Na/NaCl METERS • pH/ORP/Na ELECTRODES • PROBES (DO, µS/cm, RH, T, TDS) • PUMPS • REAGENTS • SOFTWARE • THERMOMETERS • TITRATORS • TRANSMITTERS • TURBIDITY METERS • Wide Range of Accessories Most Hanna meters are available in the following formats:
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