Instruction Manual

HI 9143 HI 9145
Portable D.O. Meters in Water-Resistant Casing
HI 91 Micro 43 Auto processo r Diss Cal o Oxyg lved en M eter

FAC TOR

w w w. h a n n a i n s t. c o m
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.
PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it to make sure that no damage has occurred during shipping. If there is any damage, immediately notify your dealer. Each meter is supplied complete with: HI 76407/4 DO probe with 4 m (13) cable 2 spare membranes with O-rings Protective cap HI 7041S electrolyte solution (30 mL) Batteries (4 x 1.5V AA) Instruction manual Rugged carrying case Note: Save all packing material until you are sure that the instrument functions correctly. Any defective items must be returned in the original packing with the supplied accessories.
TABLE OF CONTENTS Preliminary Examination.. 3 General Description.. 3 Functional Description - Probe.. 4 Functional Description - Meter. 5 Specifications.. 6 Probe Preparation.. 7 Calibration... 8 Taking Measurements. 10 Altitude Compensation.. 12 Salinity Compensation.. 13 Probe & Membrane Maintenance. 14 Battery Replacement.. 16 Accessories... 17 Warranty... 18 CE Declaration of Conformity.. 19
GENERAL DESCRIPTION HI 9143 and HI 9145 are water-resistant dissolved oxygen meters designed for harsh outdoor applications, especially waste water treatment and fish farming. Simple on-site calibration requires no chemical solutions. Just expose the probe to air and press the CAL button. In a few minutes, the meter is calibrated and ready to use. The new and improved HI 9143 and HI 9145 measure and display O2 from 0 to 300%, 0 to 45 mg/L and temperature from 0 to 50 C. In addition to the features of HI 9145, HI 9143 also supplies the user with compensation of salinity and altitude factors. Both meters compensate for the temperature effect.
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.
FUNCTIONAL DESCRIPTION - METER

SAMPLE

HI 9143 Microprocessor Auto Cal Dissolved Oxygen Meter

ON/OFF

LOBAT SAMPLE HOLD F1 F2
FUNCTIONAL DESCRIPTION - PROBE

FACTOR

1) 2) 3) 4) 5) 6)
7) 8) 9) 10) 19) 20) 21) 22) 23) 24)
1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
D.O. probe Protective cap Watertight shielded cable Polypropylene body Temperature sensor O-Ring seal AgCl (silver chloride) anode Platinum cathode Oxygen permeable membrane Membrane cap
Battery compartment Probe connector Liquid Crystal Display (LCD) ON/OFF key CAL key, to enter/exit calibration mode FACTOR* key, to select altitude (F1) and salinity (F2) UP* and DOWN* arrow keys, to set F1 and F2 values HOLD key, to freeze reading on display RANGE key, to select oxygen measurement range (ppm or % of saturation) Socket for 12 Vdc power adapter LOW BAT, low battery indicator SAMPLE, measuring mode indicator F1, altitude factor* indicator F2, salinity factor* indicator % or ppm, oxygen measure unit Secondary display

(*) HI 9143 only

SPECIFICATIONS
PROBE PREPARATION All HANNA D.O. probes are shipped dry. To hydrate the probe and prepare it for use, connect it to the meter and proceed as follows. Shipping 1. Remove the red & black plascap tic cap used for shipping purposes only. 2. Wet the sensor by soaking black the bottom (2.5 cm/1") of the probe in HI 7041S electrolyte red solution for 5 minutes. 3. Rinse the supplied membrane (HI76407A) with some electrolyte while shakFIRST ing it gently. INSERT SECOND Refill with fresh ORING FILL electrolyte. 4. Gently tap the THIRD sides of the TAP membrane with your finger to ensure that no air bubbles remain trapped. THEN SCREW BACK ON To avoid any damage, do not tap the membrane directly on the bottom. 5. Make sure that the rubber O-ring sits properly inside the membrane cap. 6. With the sensor facing down, screw the cap clockwise. Some electrolyte will overflow. When not in use, protect the membrane with the supplied cap.

HI 9143 Range

HI 9145
0.00 to 45.00 mg/L O2 0.0 to 300.0% O2 0.0 to 50.0C 0.01 mg/L / 0.1% O2 0.1C

Resolution

Accuracy (@20C/68F) 1.5% FS (O2) 0.5C Typical EMC Deviation 0.3 mg/L / 3.5% O2 0.5 C Calibration Automatic, in air, at 100% Temperature Compensation Automatic, 0 to 50C (32 to 122F) Altitude Compensation 0 to 1900 m (resolution 100 m) Salinity Compensation 0 to 40 g/L (resolution 1 g/L) Probe Environment Power Supply 4 x 1.5V AA batteries; approx. 200 hours of continuous use; auto-off after 4 hours of inactivity; or input for 12 Vdc adapter Dimensions Weight 196 x 80 x 60 mm (7.7 x 3.1 x 2.4") 500 g (1.1 lb.) ---
HI 76407/4 polarographic with 4 m (13) cable (included) 0 to 50C (32 to 122F); RH max 100%

CALIBRATION

For an accurate calibration, it is recommended to wait an additional 5-10 minutes to ensure optimum conditioning of the probe. Remove the protective cap.
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. If this operation is interrupted, the electrolyte solution continues to be enriched with oxygen until it reaches an equilibrium with the surrounding solution. Measurements taken with a nonpolarized probe give an oxygen level that indicates that of the test solution as well as any oxygen present in the electrolyte solution. This reading is obviously incorrect. The HANNA HI 9143 and HI 9145 oxygen meter automatically polarize the probe each time they are switched on.

Calibration is simple and is recommended every time the meter is switched on. Make sure the probe is ready for measurement (see page 7), i.e. the membrane is filled with electrolyte, probe is connected to the meter and properly polarized. Switch the meter on. "COND" appears on the display to inform the user that ON/OFF the probe is in auto-conditioning (automatic polarization) mode. Once "COND" disappears, the probe is polarized and the instrument can be calibrated.
Press CAL. The disply shows "----" together with the "CAL" symbol to indicate that the instrument is in calibration mode. The instrument will automatically standardize itself to the actual saturation value. After approx. 1 minute it will display "100%" with "SAMPLE" to indicate that the calibration is complete.
HI 9143 only: press FACTOR and ensure that F1 and F2 are set to the appropriate altitude and salinity values.
Notes: The instrument must be calibrated whenever the probe, membrane or electrolyte is changed. To exit the calibration mode at any time, press CAL. CAL The display may be switched from readings in % saturation to ppm (mg/L) by simply RANGE pressing the RANGE key. Recalibration is not needed.

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.
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. During field measurements, this condition may be obtained by manually stirring the probe. Accurate readings are not possible while the liquid is stationary. During laboratory measurements, the use of a magnetic stirrer to ensure a certain agitation of the fluid is recommended. This way, any errors due to the presence of air bubbles on the menbrane surface are minimized. For accurate measurements, allow sufficient time for the thermal equilibrium to be reached between the probe and the measured sample (a few minutes if the temperature difference is several degrees).
mg/L READINGS The mg/L mode give the dissolved oxygen concentration directly in ppm. If the sample contains significant salinity or if the measurement is taken at a higher altitude than sea level, the readout values must be corrected, by taking into account the lower degree of oxygen solubility in such conditions. Compensation for altitude and sality effects is possible with the HI 9143 model. Altitude and/or salinity values should be set before calibrating and taking measurements. The meter will automatically compensate for these factors (see Altitude Compensation and Salinity Compensation sections). % O2 SATURATION READINGS The % O2 reading provides the rate of oxygen saturation with reference to 100% at sea level.

T E M P E R A T U R E READINGS The secondary display will show the sample temperature in Celsius degrees.
Allow the probe to reach thermal equilibrium with the sample before taking any measurement. The greater the difference between the ambient temperature and the temperature of the sample, the longer it will take the probe to acclimatized itself to the sample.
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.
HI 9145 With HI 9145, all the DO readings refer to the sea level. Altitude affects the DO concentration by decreasing its value. The following table reports the maximum oxygen solubility at various temperatures and altitudes. The table provides an idea of the error that can be introduced at different altitudes and the quantity to be subtracted to correct the reading.
Altitude above Sea Level (in meters) C 40
0m 300 m 600 m 900 m 1200 m 1500 m 1800 m
HI 9145 All DO readings refer to 0 g/L of salinity. Salinity affects the DO concentration by decreasing its value. The table below shows the maximum solubility of oxygen at various temperatures and salinity levels. By using the table, the quantity to be subtracted to correct the reading can be calculated.
14.6 13.8 13.1 12.4 11.8 11.3 10.8 10.3 9.9 9.5 9.1 8.7 8.4 8.1 7.8 7.5 7.3 7.1 6.8 6.6 6.4
14.1 13.3 12.7 12.0 11.4 10.9 10.4 9.9 9.7 9.2 8.8 8.4 8.1 7.8 7.5 7.2 7.1 6.9 6.6 6.4 6.2
13.6 12.9 12.2 11.6 11.0 10.5 10.1 9.6 9.2 8.7 8.5 8.1 7.8 7.5 7.3 7.0 6.8 6.6 6.3 6.2 6.0
13.2 12.4 11.9 11.2 10.6 10.2 9.7 9.3 8.9 8.6 8.2 7.8 7.5 7.3 7.0 6.8 6.6 6.4 6.1 5.9 5.8
12.7 12.0 11.4 10.8 10.3 9.8 9.4 9.0 8.6 8.3 7.9 7.7 7.3 7.0 6.8 6.5 6.4 6.2 5.9 5.7 5.6
12.3 11.6 11.0 10.4 9.9 9.5 9.1 8.7 8.3 8.0 7.7 7.3 7.1 6.8 6.6 6.3 6.1 6.0 5.7 5.6 5.4
11.8 11.2 10.6 10.1 9.6 9.2 8.8 8.3 8.0 7.7 7.4 7.1 6.8 6.6 6.3 6.1 5.9 5.8 5.5 5.4 5.2

32.0 35.6 39.2 42.8 46.4 50.0 53.6 57.2 60.8 64.4 68.0 71.6 75.2 78.8 82.4 86.0 89.6 93.2 96.8 100.4 104.4
Salinity (g/L) at Sea Level C 26 28
0 g/L 10 g/L 20 g/L 30 g/L 35 g/L
F 50.0 53.6 57.2 60.8 64.4 68.0 71.6 75.2 78.8 82.4
11.3 10.8 10.3 9.9 9.5 9.1 8.7 8.4 8.1 7.8
10.6 10.1 9.7 9.3 8.9 8.5 8.2 7.9 7.6 7.4
9.9 9.5 9.1 8.7 8.4 8.0 7.8 7.5 7.2 7.0
9.3 8.9 8.6 8.2 7.9 7.6 7.3 7.1 6.8 6.6
9.0 8.6 8.3 8.0 7.6 7.4 7.1 6.9 6.6 6.4
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. 1 Wet the sensor by soaking the bottom (2.5 cm / 1") of the probe in HI7041S electrolyte solution for 5 minutes. Rinse a new membrane (HI 76407A) with some electrolyte while shaking it gently. Refill with fresh electrolyte. Gently tap the sides of the membrane with your finger to ensure that no air bubbles remain trapped. Do not directly tap the bottom as this may damage the membrane. UNSCREW Make sure that the rubber O-ring is seated propfig. 2 erly inside the membrane cap.
With the sensor facing down, screw the membrane cap clockwise. Some electrolyte will overflow.
The platinum cathode sensor 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 sensor should be cleaned. Use a clean, lint-free cardboard or cloth. Rub the cathode very gently side to side 4-5 times. This will be enough to polish and remove any stains without damaging the platinum tip. Then, rinse the probe with deionized or distilled water. Install a new membrane and fill it with fresh electrolyte following the instructions above. Recalibrate the instrument. Important: For accurate and stable measurements, it is important that the surface of the membrane is in perfect condition. This permeable membrane isolates the sensor elements from the environment but allows oxygen to enter. If any dirt is deposited on the membrane, rinse it carefully with distilled or deionized water. If any imperfection is observed, or any damage is evident (such as wrinkles, tears or holes), the membrane should be replaced. Make sure that the O-Ring is properly seated in the membrane cap.

BATTERY REPLACEMENT

Use the HANNA adapters (such as HI 710005 or HI 710006) with proper polarity configuration.
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

Battery replacement must only take place in a safe area using 1.5V AA alkaline batteries.
HI 9143 and HI 9145 can also run on other adapters. In this case, check the correct polarity of the adapter before connecting it to the meter.
In order to replace the batteries, simply remove the two screws on the rear cover of the instrument and replace all four batteries with new ones, while paying attention to the correct polarity.
ACCESSORIES HI 76407/4 HI 76407/10 HI 76407/20 HI 7041S HI 76407A/P HI 710005 HI 710006 HI 710012 HI 710013 HI 710014 DO probe with 4 m (13') cable DO probe with 10 m (33') cable DO probe with 20 m (66') cable Refilling electrolyte solution, 30 mL Spare DO membrane (5 pcs) 115 Vac/12 Vdc adapter, US plug 230 Vac/12 Vdc adapter, European plug 240 Vac/12 Vdc adapter, UK plug 230 Vac/12 Vdc adapter, South African plug 230 Vac/12 Vdc adapter, Australian plug
A 12 Vdc power source can also be used to power the unit. Simply unscrew the protective cap on the top of the instrument and plug the power adapter into the socket. Note: The instrument uses the following configuration.

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. If under warranty, report the model number, date of purchase, serial number and the nature of the failure. If the repair is not covered by the warranty, you will be notified of the charge for repair or replacement. If the instrument is to be returned to Hanna Instruments, please obtain a Return Goods Authorization from the Customer Service Department and then send it with shipment cost prepaid. When shipping any instrument, make sure it is properly packaged for complete protection.
All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner.

Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. 18
Recommendations for Users Before using these products, make sure that they are entirely suitable for the environment in which they are used. Operation of this instrument in residential area could cause unacceptable interference to radio and TV equipment, 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. To avoid electrical shock, do not use these instruments 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.
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 6291.6906

South Africa:

Tel. (011) 615.6076 Fax (011) 615.8582

Taiwan:

Tel. 886.2.2739.3014 Fax 886.2.2739.2983

MANDOWPR3

Thailand:
Tel. 66.2619.0708 Fax 66.2619.0061

United Kingdom:

Tel. (01525) 850.855 Fax (01525) 853.668
Tel. (401) 765.7500 Fax (401) 765.7575
For e-mail contacts and complete list of Sales and Technical offices, please see www.hannainst.com