Hanna Instruments HI 9146 User manual

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Dissolved Oxygen
and
Temperature Meter
HI 9146
Instruction Manual
www.hannainst.com

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Dear Customer,
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using this instrument.
This manual will provide you with the necessary information for correct
use of this instrument, as well as a precise idea of their versatility.
If you need additional technical information, do not hesitate to e-mail us
at [email protected].
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
HI 9146 is guaranteed for two years against defects in workmanship and
materials when used for its intended purpose and maintained according
to instructions. Electrodes and probes are guaranteed for six months. This
warranty is limited to repair or replacement free of charge.
Damage due to accidents, misuse, tampering or lack of prescribed
maintenance is 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 problem. If the repair is
not covered by the warranty, you will be notified of the charges incurred.
If the instrument is to be returned to Hanna Instruments, first obtain a
Returned Goods Authorization number from the Technical Service
department and then send it with shipping costs prepaid. When
shipping any instrument, make sure it is properly packed for complete
protection.
WARRANTY ........................................................................................................... 2
PRELIMINARY EXAMINATION ................................................................................. 3
GENERAL DESCRIPTION ......................................................................................... 3
PROBE FUNCTIONAL DESCRIPTION ......................................................................... 4
METER FUNCTIONAL DESCRIPTION ......................................................................... 5
SPECIFICATIONS ................................................................................................... 7
OPERATIONAL GUIDE ............................................................................................. 8
AutoEnd ............................................................................................................. 12
DO CALIBRATION ................................................................................................. 12
GOOD LABORATORY PRACTICE (GLP) ..................................................................... 15
SETUP ................................................................................................................ 17
DO CONCENTRATION VERSUS SALINITY CHART ..................................................... 18
DO CONCENTRATION VERSUS ALTITUDE CHART ..................................................... 19
TEMPERATURE CALIBRATION (for technical personnel only).................................. 20
BATTERIES REPLACEMENT .................................................................................... 21
LCD MESSAGE GUIDE ........................................................................................... 22
PROBE & MEMBRANE MAINTENANCE .................................................................. 23
TROUBLESHOOTING GUIDE .................................................................................. 25
ACCESSORIES ..................................................................................................... 26
WARRANTYWARRANTY
WARRANTYWARRANTY
WARRANTY

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HI 9146 is state-of-the-art, heavy-duty DO meter, designed to provide
laboratory results and accuracy under harsh industrial conditions.
This instrument is provided with a series of new diagnostic features and
messages on the LCD which add an entirely new dimension to the
measurement of DO, by allowing the user to dramatically improve the
reliability of the measurement.
The Auto Endpoint feature automatically freezes the display when a
stable reading is reached.
Dissolved Oxygen is indicated in ppm (parts per million) or in %. All
measurements are automatically compensated for temperature. Salinity
compensation in water allows direct determination of Dissolved Oxygen in
saline waters and altitude compensation readjusts for the altitude variance.
The Dissolved Oxygen probe has a membrane covering the polarographic
sensors and a built-in thermistor for temperature measurements and
compensation. This permeable PTFE membrane isolates the sensor
elements from the testing solution, but allows Oxygen to pass through.
When a voltage is applied across the sensor, oxygen that has passed
through the membrane reacts causing a current flow, and hence
determining a reading.
The Battery Error Preventing System (BEPS) detects when the batteries
become too weak to ensure reliable measurements.
The backlight feature is automatically disabled when batteries are
getting low and a clear indication is displayed to warn the user of this
condition. However, the meter continues to measure correctly even when
the low battery indication is displayed. The meter automatically switches
itself off when the batteries are too weak to support proper function.
In addition, the meter allow the user to enter an ID code to uniquely
identify the instrument.
Remove the instrument from the packing material and examine it carefully
to make sure that no damage has occurred during shipping. If there is any
damage, notify your Dealer or the nearest Hanna Customer Service Center.
Each instrument is supplied with:
•HI 76407/2 DO probe with 2 m (6.7’) cable
•HI 76407A membarne cap (2 pcs.)
•HI 7041S electrolyte solution (30 mL)
•3 x 1.5V AAA, Batteries
•Instruction Manual
•Rugged Carrying Case
Note:Save all packing material until you are sure that the instrument
functions correctly. All defective items must be returned in the
original packing with the supplied accessories.
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION

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1. D.O. Probe
2. Protective Cap
3. Watertight Shielded Cable
4. Polypropylene Probe Body
5. Temperature Sensor
6. O-Ring Seal
7. Silver Chloride Anode
8. Platinum Cathode (sensor)
9. Oxygen Permeable PTFE Membrane
10. Membrane Cap
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8
10
9
3
4
1
2
4
5
6
PROBE FUNCTIONAL DESCRIPTIONPROBE FUNCTIONAL DESCRIPTION
PROBE FUNCTIONAL DESCRIPTIONPROBE FUNCTIONAL DESCRIPTION
PROBE FUNCTIONAL DESCRIPTION

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1) Liquid Crystal Display (LCD).
2) Range key, to select ppm or % range.
3) On/Off key, to turn the instrument ON and OFF.
4) CAL key, to enter/exit calibration mode.
5) Setup key, to enter/exit SETUP mode.
6) key, to manually increase temperature or other parameters.
7) Battery compartment cap.
8) DIN connector for DO probe.
9) key, to manually decrease temperature or other parameters.
METER FUNCTIONAL DESCRIPTIONMETER FUNCTIONAL DESCRIPTION
METER FUNCTIONAL DESCRIPTIONMETER FUNCTIONAL DESCRIPTION
METER FUNCTIONAL DESCRIPTION

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10) GLP key, to display Good Laboratory Practice information.
CFM key, to confirm different values.
11) AutoEnd key, to freeze first stable reading on the LCD.
12) Light key, to toggle display backlighting.
13) Secondary LCD.
14) Primary LCD.

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SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS

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INITIAL PREPARATION
The instrument is supplied complete with batteries. In order to place the
batteries inside the instrument follow the instructions from page 21.
To take measurements, connect the DO probe to the meter securely by
aligning the pins with the socket located on the back of the meter,
pushing the plug in and tightening the threaded ring.
Probes shipped from Hanna Instruments are dry. To hydrate the probe
and prepare it for use, connect it to the meter and proceed as follows:
1. Remove the red and black plastic cap.
This cap is for shipping purposes and
can be thrown away.
2. Wet the sensor by soaking the bottom
2½ cm (1") of the probe in electrolyte
(HI 7041S) for 5 minutes.
3. Rinse the membrane cap (HI 76407A
supplied in the kit with the meter)
with electrolyte solution while shaking
it gently. Refill with clean electrolyte
solution.
4. Tap gently the sides of the membrane
cap with your finger tip to ensure that
no air bubbles are trapped. To avoid
damaging the membrane, do not tap
it directly on the bottom.
5. Make sure that the rubber O-ring sits
properly inside the membrane cap.
6. With the sensor facing down, slowly
screw the cap clockwise. Some electrolyte
will overflow.
When not in use and during polarization
(see page 9), use the protective transparent
cap supplied in the kit with the meter.
Shipping
cap
black
red
FILL FIRST
THEN TAP
THEN SCREW
BACK ON
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDE

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Turn the instrument ON by pressing On/Off.
At start-up the display will show all
the used segments for a few seconds
(or while the button is held), followed
by the percentage indication of the
remaining battery life.
•After a few seconds “Cond” message
appears, the “ ” and “WAIT” tags will
blink on the LCD if probe is connected
to inform the user that the probe is in
auto-conditioning (automatic polarization)
mode.
•When this message disappears, the probe
is polarized and the instrument can be
calibrated.
•The meter is now ready to operate.
•If the probe is disconnected or broken, the
meter will display “----” and “NO Probe”
tag blinking. In this situation only SETUP
menu is available.
The auto-off feature turns the instrument off
after a set period (default 20 min) with no
button pressed to save battery life. To set
another period or to disable this feature, see SETUP menu on page 17.
The auto-off backlight feature turns the backlight off after a set period
(default 1 min) with no buttons pressed. To set another period or to
disable this feature, see SETUP menu on page 17.
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.

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With the probe properly polarized, oxygen is continually consumed
when it passes through the sensitive diaphragm and dissolves in the
electrolyte solution contained in the probe.
If polarization is interrupted, the electrolyte solution continues to be
enriched with oxygen until it reaches an equilibrium with the surrounding
solution.
Whenever measurements are taken with a non-polarized probe, the
oxygen level revealed is both that of the tested solution, as well as that
present in the electrolyte solution. This reading is incorrect.
Keep the protective cap on during polarization time and remove it for
calibration and measurements.
Note:If the probe is changed while the instrumen is ON, a conditioning
period is started.
SALINITY AND ALTITUDE COMPENSATION
If the sample contains significant concentration of salinity or if you are
performing measurements at an altitude different from sea level, the
read out values must be corrected, taking into account the lower degree
of oxygen solubility in these situations (see pages 18-19).
Remember to set the altitude and/or the salinity before taking any DO
measurements. The meter will automatically compensate for these factors.
DO MEASUREMENTS
Make sure that the instrument has been
calibrated and the protective cap has been
removed.
•Immerse the tip of the probe in the sample
to be tested. Allow approximately one
minute for the reading to stabilize.
•The Dissolved Oxygen value (in ppm) is
displayed on the primary LCD and the
temperature on the secondary LCD.
•Press RANGE to change the reading from
ppm to % and vice-versa.