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Water Quality Testing Equipment >Hanna HI9142 HI9143 Dissolved Oxygen Meter

Hanna DO



HI9142 Manual pdf HI9143 Manual pdf

The Dissolved Oxygen HI 9142 and the extended range HI 9143 provide a rugged, waterproof DO meter that solves the common problems of field use. Calibration is normally done in the air. There is no need to use chemical solutions or time consuming calibration procedures. A Zero calibration with HI 7040 zero oxygen solution is done during maintenance.


What is Dissolved Oxygen

Dissolved oxygen measurement is the gaseous oxygen (O2) dissolved in a solution. Diffusion from the surrounding air by aeration (stream or wave movement) causes oxygen, to become dissolved oxygen in water. Dissolved oxygen also enters as a waste product of photosynthesis.

The dissolved oxygen measurement, should be performed as a grab sample in the field. Oxygen in the water diffuses through the DO meter probe membrane at a rate proportional to oxygen's partial pressure. Probes of dissolved oxygen meters measure a current as oxygen arrives at the meter's internal cathode and then is presented, upon proper calibration, at the meter read-out.

Dissolved oxygen in water should not exceed 110 percent. Higher concentrations may be lethal to fish. Dissolved oxygen levels below 5.0 mg/l in water create stress on aquatic life. Dissolved oxygen measurements below 1-2 mg/l can result in fish kills.

Dissolved 02 in water is used in the decomposition of organic matter. Large amounts of organic matter in water reduces dissolved oxygen creating stress on the aquatic population.


Dissolved Oxygen - HI 9142 & HI 9143

  • Waterproof Casing - The rugged construction is waterproof, making it indispensable in the biological and water treatment industries.
  • One Point Calibration - The meter can be calibrated in saturated air without the need for chemical solutions.
  • ATC Circuitry - The built-in Automatic Temperature Compensation circuitry will adjust all readings to provide the utmost dissolved O2 accuracy.
  • Low Battery Indicator - The indicator gives the user advanced notice to avoid taking an erroneous dissolved oxygen reading due to low power.
  • Cable Length - A 20 m (65.6 ft) and a 10 m Cable (32.8 ft) are available. Comes standard with 4 m Cable (13 ft).
  • Calibration Solutions Air or HI7040 zero oxygen solution.

    Service & Repair

Hanna DO Specifications
0.0 to 19 mg/L
0.1 mg/L
Accuracy (@20° C/68° F)
+/- 1.5% Full Scale
Typical EMC Deviation
+/-0.8 mg/L with HI 76407/4
Manual 1 or 2 points (zero and slope)
Temperature Compensation
Automatic from 0 to 30° C(32 to 86° F)
HI 76407/4 polarographic D.O. probe with 4m (13') cable (included)
Battery Type/Life
4 x 1.5 V AA / Aprox. 100 hours of continued use
0 to 50° C (32 to 122° F); RH 100%
196 x 80 x 60 mm (7.7 x 3.1 x 2.4")
425g (15 oz.); kit 1.4 kg (3.1 lb)

Other DO Meters

GS DO Meter - Horiba U-50 Series
GS DO Analyzer - Hanna Hi 9828

Other Conductivity Solutions

GS Hanna pH/Conductivity Meter
GS Conductivity Solution

Geotechnical Services, Inc.
2852 Walnut Ave., Suite E-1

Tustin, CA 92780

Phone 714-832-5610

Fax 714-832-8766

LAT 33.71232 / LON -117.80591

CALL TOLL FREE 800-524-9111

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