Hanna Instruments HI 9143 User Manual

Instruction Manual
HI 9143 • HI 9145
Portable D.O. Meters
in Water-Resistant Casing
SAMPLE
ppm
°C
HI 9143
Microprocessor
Auto Cal
Dissolved
ON/OFF
CAL
RANGE
HOLD
FACTOR
www.hannainst.com
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 neces-
sary 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
Cali bratio n ................................................... 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
23
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.
HI 9143 Microprocessor Auto Cal Dissolved Oxygen Meter
CAL
ON/OFF
RANGE
FACTOR
85
9
67
23
24
4
19 20
21 22
3
210
SAMPLE
LOBAT SAMPLE HOLD
CAL
F1 F2
HOLD
ppm
ppm %
°C
°C
1
2
10
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 - PROBE
3
1
FUNCTIONAL DESCRIPTION - METER
4
6 7
8
9
4
5
6 7
8 9
1. D.O. probe
2. Protective cap
3. Watertight shielded cable
4. Polypropylene body
5. Temperature sensor
6. O-Ring seal
7. AgCl (silver chloride) anode
8. Platinum cathode
9. Oxygen permeable membrane
10. Membrane cap
45
1) Battery compartment 2 ) Probe connector
3) Liquid Crystal Display (LCD)
4) ON/OFF key
5) CAL key, to enter/exit calibration mode
6) FACTOR* key, to select altitude (F1) and salinity (F2)
2
10
7) UP* and DOWN* arrow keys, to set F1 and F2 values
8) HOLD key, to freeze reading on display
9) RANGE key, to select oxygen measure­ment range (ppm or % of saturation)
10) Socket for 12 Vdc power adapter
19) “LOW BAT”, low battery indicator
20) “SAMPLE”, measuring mode indicator
21) “F1”, altitude factor* indicator
22) “F2”, salinity factor* indicator
23) “%” or “ppm”, oxygen measure unit
24) Secondary display
(*) HI 9143 only
SPECIFICATIONS
PROBE PREPARATION
HI 9143 HI 9145
Range 0.00 to 45.00 mg/L O
0.0 to 300.0% O
0.0 to 50.0°C
Resolution 0.01 mg/L / 0.1% O
0.1°C
Accuracy (@20°C/68°F)
±1.5% FS (O2)
±0.5°C
Typical EMC Deviation
±0.3 mg/L / ±3.5% O
±0.5 °C
Calibration Automatic, in air, at 100% Temperature Compensation
Automatic, 0 to 50°C (32 to 122°F)
Altitude Compensation
0 to 1900 m ---
(resolution 100 m)
Salinity Compensation
0 to 40 g/L ---
(resolution 1 g/L)
Probe HI 76407/4 polarographic
with 4 m (13’) cable (included)
Environment 0 to 50°C (32 to 122°F);
RH max 100%
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 196 x 80 x 60 mm
(7.7 x 3.1 x 2.4")
Weight 500 g (1.1 lb.)
2
2
2
2
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.
1. Remove the red & black plas-
Shipping
cap
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 solution for 5 minutes.
red
3. Rinse the sup-
plied membrane (HI76407A) with some electro­lyte while shak­ing it gently. Refill with fresh electrolyte.
4. Gently tap the
sides of the
SECOND
FILL
THIRD
TAP
FIRST INSERT O’RING
membrane with your finger to ensure that no air bubbles re­main trapped. To avoid any
THEN SCREW
BACK ON
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.
67
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. 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.
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.
Press CAL. The disply shows "----" together with the "CAL" symbol to indicate that the instrument is in calibration
CAL
mode.
The instrument will automati­cally standardize itself to the
CAL
actual saturation value. After approx. 1 minute it will dis­play "100%" with "SAMPLE" to indicate that the calibra-
SAMPLE
%
°C
tion 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.
• The display may be
CAL
switched from readings in % saturation to ppm (mg/L) by simply pressing the RANGE
RANGE
key. Recalibration is not needed.
89
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.
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.
SAMPLE
%
°C
TEMPERATURE 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.
10 11
ALTITUDE COMPENSATION
SALINITY COMPENSATION
HI 9143
Press FACTOR and “F1” will be displayed.
Use the UP and DOWN keys
SAMPLE
F1
or
to set the altitude from 0 to 1900 m, in steps of 100 m.
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
0 m
300 m
10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
600 m
0
14.6
14.1
2
13.8
4
13.1
6
12.4
8
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
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
900 m
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
1200 m
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
1500 m
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
1800 m
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
ppm
°F
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
HI 9143
Press FACTOR twice and “F2” will be displayed.
Press the UP and DOWN keys to set the salinity between 0
SAMPLE
ppm
F2
or
and 40 g/L. Press FACTOR again to display the temperature.
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.
Salinity (g/L) at Sea Level
°C 10
12 14 16 18 20 22 24 26 28
0 g/L
11.3
10.8
10.3
9.9
9.5
9.1
8.7
8.4
8.1
7.8
10 g/L
10.6
10.1
9.7
9.3
8.9
8.5
8.2
7.9
7.6
7.4
20 g/L
9.9
9.5
9.1
8.7
8.4
8.0
7.8
7.5
7.2
7.0
30 g/L
9.3
8.9
8.6
8.2
7.9
7.6
7.3
7.1
6.8
6.6
35 g/L
9.0
8.6
8.3
8.0
7.6
7.4
7.1
6.9
6.6
6.4
°F
50.0
53.6
57.2
60.8
64.4
68.0
71.6
75.2
78.8
82.4
12 13
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).
Unscrew the membrane by turning it counterclock-
TWIST
AND
PULL
wise (fig.2)
Wet the sensor by soak-
fig. 1
ing 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.
Make sure that the rub­ber O-ring is seated prop-
UNSCREW
fig. 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.
14 15
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
LOBAT SAMPLE
ppm
°C
the operator that the display will be shut-off after about 4 hours of use to prevent erroneous readings due to low voltage.
Battery replacement must only take place in a safe area using 1.5V AA alkaline batteries.
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.
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.
ACCESSORIES
HI 76407/4 DO probe with 4 m (13') cable HI 76407/10 DO probe with 10 m (33') cable HI 76407/20 DO probe with 20 m (66') cable HI 7041S Refilling electrolyte solution,
30 mL
HI 76407A/P Spare DO membrane (5 pcs)
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 con-
figuration.
16 17
HI 710005 115 Vac/12 Vdc adapter, US
plug
HI 710006 230 Vac/12 Vdc adapter, Eu-
ropean plug
HI 710012 240 Vac/12 Vdc adapter, UK
plug
HI 710013 230 Vac/12 Vdc adapter, South
African plug
HI 710014 230 Vac/12 Vdc adapter, Aus-
tralian plug
WARRANTY
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.
CE DECLARATION OF CONFORMITY
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 19
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
Thailand:
Tel. 66.2619.0708 • Fax 66.2619.0061
United Kingdom:
Tel. (01525) 850.855 • Fax (01525) 853.668
USA:
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
MANDOWPR3 09/05
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