Hanna Instruments HI 91410 Instruction Manual

1

Instruction Manual

HI 9141 • HI 91410

Printing and Logging

Dissolved Oxygen Meters

ON/OFF

PAPER

FUNCTION

UP

DOWN

CAL

PRINT

LOG

MICROPROCESSOR LOGGING
DISSOLVEDOXYGEN METER

HI 91410

RANGE

O

2

0. . . 19.99ppm

www.hannainst.com

32

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 cable

• HI 7041S electrolyte solution (30 mL)

• Protective cap

• 2 spare membranes with O-ring

• 5 pPaper rolls

• 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. All defective items must be
returned in the original packing with
the supplied accessories.

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 all the neces-

sary information for a correct use.
If you need additional technical support, do not

hesitate to e-mail us at [e-mail]
These instruments are in compliance with the

directives.

TABLE OF CONTENTS

Warranty ..................................................... 3

Preliminary Examination............................. 3

General Description .................................... 4

Probe Functional Description...................... 5

Functional Description HI9141 ................... 6

Functional Description HI91410.................. 7

Specifications ............................................. 8

Initial Preparation........................................ 9

Calibration................................................. 11

Taking Measurements .............................. 13

Setting Date, Time, Printing Interval ......... 15

Printing / Recording with HI9141.............. 18

Printing / Logging with HI91410 ............... 20

Altitude Compensation.............................. 2 4

Salinity Compensation.............................. 25

Temperature Compensation ...................... 25

Probe & Membrane Maintenance ............. 26

Data Transfer to PC (HI91410) ................. 28

Fault Functions ........................................ 29

Memory Organization (HI91410) ............... 30

Printer Maintenance.................................. 31

Battery Replacement ................................ 33

Accessories.............................................. 35

WARRANTY

All Hanna Instruments 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 accident, 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, obtain a Return Goods Autho­rization from the Customer Service Department
first and then send it with shipment cost prepaid.
When shipping any instrument, make sure it is
properly packaged for complete protection.

PRELIMINARY EXAMINATION

54

PROBE FUNCTIONAL DESCRIPTION

1. Dissolved Oxygen (DO) probe

2. Protective cap

3. Watertight shielded cable

4. Polypropylene probe body

5. Temperature sensor

6. O-Ring seal

7. AgCl (silver chloride) anode

8. Platinum cathode (sensor)

9. Oxygen permeable membrane

10. Membrane cap

3

1

4

4

5

6

2

9

8

10

7

HI 9141 and HI 91410 are portable, printing
DO meters designed for continuous monitor­ing and recording at selectable time intervals.
The low-power printer uses regular paper that
is easily sourced and will not fade over time.
HI 91410 combines all of the comprehensive
printing functions of the HI 9141, with the
capability to log measurements. In addition
to supplying the user with instant print-outs
of DO, HI 91410 also provides datalogging
facilities that will store up to 8000 readings.
These measurements can be scrolled through
at any time, printed or even transferred to a
computer system for elaboration or perma­nent storage. An optional HI 9200 infrared
transmitter can be used to take the data from
HI 91410 and send it to a computer without
any cords. Simply place the meter on the
cradle and, at the touch of a button, all of the
recorded lots are transferred in seconds. This
infrared connection is important in humid
environments, where a standard RS232 plug
on a meter could become damaged.
In addition to the automatic calibration fea­ture, both meters automatically compensate
for altitude (from 0 to 1900 meters) and salin­ity (from 0 to 40 g/L).

The dissolved oxygen probe has a membrane
covering the polarographic sensors and a built­in thermistor for temperature measurements
and compensation. This 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 a current flow.

GENERAL DESCRIPTION

Hanna Instruments reserves the right to modify

the design, construction and appearance of its

products without advance notice.

76

FUNCTIONAL DESCRIPTION HI91410

1. Probe and power adapter sockets

2. UP key, to set date, time, printing interval,
altitude & salinity factors

3. DOWN key, to set date, time, printing
interval, altitude & salinity factors

4. PRINT key, to print on-demand

5. LOG key, to enter/exit logging mode

6. Liquid Crystal Display (LCD)

7. PAPER key, to move the paper up

8. ON/OFF key, to turn the meter on or off

9. FUNCTION key, to select the D.O. or
temperature mode, and for compensation
selection

10. CAL key, to enter/exit calibration mode

ON/OFF

PAPER

FUNCTION UP

DOWN

CAL

PRINT

LOG

6

7
8

9

10

4
5

3

2

1

MICROPROCESSOR LOGGING
DISSOLVEDOXYGEN METER

HI 91410

RANGE

O20. . . 19.99ppm
°C 0. . . +50.0°C

FUNCTIONAL DESCRIPTION HI9141

1. Probe and power adapter sockets

2. UP key, to set date, time, printing inter-
val, altitude & salinity factors

3. DOWN key, to set date, time, printing
interval, altitude & salinity factors

4. PRINT key, to print on-demand

5. RECORD key, to enter recording mode

6. Liquid Crystal Display (LCD)

7. PAPER key, to move the paper up

8. ON/OFF key, to turn the meter on or off

9. FUNCTION key, to select the DO or
temperature mode, and for compensation
selection

10. CAL key, to enter/exit calibration mode

ON/OFF

PAPER

FUNCTION UP

DOWN

CAL

PRINT

RECORD

6

7
8

9

10

4
5

3

2

1

MICROPROCESSOR PRINTING
DISSOLVEDOXYGEN METER

HI 9141

RANGE

O20. . . 19.99ppm
°C 0. . . +50.0°C

98

Each meter is supplied complete with four

1.5V AA batteries. Remove the back cover,
unwrap the batteries and install them while
paying attention to the polarity (see "Battery
Replacement" section for details).

To prepare the instrument for use, connect
the DO probe to the meter by aligning the
pins with the socket located on the top of the
meter, pushing the plug in and tightening the
threaded ring. See the "Initial Probe Prepara­tion" procedure explained on page 10.

To switch the meter on, press the ON/OFF
key and "Cond" appears on the display to
inform that the probe is in the auto-condition­ing (polarization) mode. Once the "Cond" dis­appears, the instrument can be calibrated.

If the probe is not connected, the meter will
display "°C ---.-", and print "---- ppm" & "---­°C" to alert the user.
This can also indicate a broken probe cable.

To save the battery life, the display is auto­matically switched off after 4 hours of non­use. However, the meter will continue to monitor
the dissolved oxygen and temperature (if in
recording/logging mode) .

ON/OFF

SPECIFICATIONS

Range 0.00 to 19.99 ppm (mg/L) O

2

0.0 to 50.0°C

Resolution 0.01 ppm (mg/L) O

2

0.1°C

Accuracy ±1.5% FS (O2)

±0.5°C

Typical EMC Deviation

±0.6 ppm (mg/L) O2 / ±3°C

Calibration Automatic,
in saturated air, at 100%

Temperature Compensation

Automatic, 0 to 30°C (32 to 86°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)

Printer Low power impact type belt,

common 38 mm plain paper (HI 710034)

Printing/Logging (HI 91410 only) Interval

Selectable at

1, 2, 5, 10, 15, 30, 60, 120 or 180 min.

PC Connection (HI 91410 only)

RS232 port with HI 9200 transmitter

and HI 92000 software (not included)

Power Supply

4 x 1.5V AA batteries / approx. 70 hours of use;

auto-off after 4 hours of inactivity;

or 12 Vdc input

Environment 0 to 50°C (32 to 122°);

RH max 95%

Dimensions 220 x 82 x 66 mm

(8.7 x 3.2 x 2.6")

Weight 550 g (1.2 lb.)

INITIAL PREPARATION

°C

14-01-96

0009 *00.50

---- ppm

---- °C

<>

1110

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" when it passes
through the sensitive diaphragm and dissolves
in the electrolyte solution inside 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 measured oxygen
level is both that of the tested solution as
well as that present in the electrolyte solu­tion. This reading is not correct.

The calibration procedure is very simple and
should be performed every time the meter is
turned on.

• Make sure the probe is ready for mea­surements (see page 10), i.e. the mem­brane cap is filled with electrolyte, the
probe is connected to the meter and prop­erly polarized.

• Switch the meter on by pressing ON/OFF.
The "Cond" message appears on the dis­play to inform that the probe is in auto­conditioning (polarization) mode.

• Once the "Cond" disappears, the instru­ment can be calibrated.

ON/OFF

THEN SCREW

BACK ON

THEN TAP

FILL FIRST

INITIAL PROBE PREPARATION

All HANNA DO 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 plas­tic cap. This cap is for ship­ping purposes and can be
thrown away.

2. Wet the sensor by soaking
the bottom 2.5 cm (1") of the
probe in HI 7041S electrolyte
solution for 5 minutes.

3. Rinse the membrane (HI76407A supplied
with the meter) with electrolyte solution
while shaking it gently.
Refill with fresh
electrolyte.

4. Gently tap the
sides of the mem­brane cap with
your finger to en­sure that no air
bubbles remain
trapped. To avoid
damaging the
membrane, 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, slowly screw
the cap clockwise. Some electrolyte will
overflow.

When not in use, protect the mem­brane with the supplied cap.

Shipping

cap

black

red

1312

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.

Make sure the temperature sensor is also
immersed.

Allow approximately one minute for the meter
to stabilize before reading on the display the
mg/L (ppm) value of dissolved oxygen.

For accurate measurements a minimum wa­ter movement of 0.3 m/sec is required. This
is to ensure that the oxygen-depleted mem­brane surface is constantly replenished. A
moving stream provides adequate circulation.

During field measurements, this condition may
be met by manually agitating the probe. Ac­curate readings are not possible while the
liquid is at rest.

During laboratory measurements, the use of
a magnetic stirrer to ensure a certain velocity
in the fluid is recommended. In this way,
errors due to the diffusion of air oxygen into
the solution are minimized.

Always allow the time necessary for thermal
equilibrium to occur between probe and tested
sample (a few minutes if the temperature
difference is only several degrees).

ppm READINGS

The meters display the con­centration of the dissolved oxy­gen directly in ppm (mg/L).

If the sample contains significant salinity
concentration or measurements are per­formed at an altitude different from sea
level, the readout values must be corrected,

• For an accurate calibra­tion, it is recommended
to wait for 5-10 minutes to
ensure precise condition­ing of the probe.

• Remove the protective
cap.

• Press the CAL key. The "CAL" message
is displayed to indicate that the calibra­tion mode has been entered.

• The instrument will automatically standard­ize itself to the actual saturation value and
after approximately 1 minute, will show
the ppm value corresponding to the maxi­mum oxygen level soluble in water at that
particular temperature, altitude and salin­ity (previously set).

Once the ppm value is dis­played, the calibration is
completed.

• Press the FUNCTION key
and make sure F1 and F2
are set to the appropriate
altitude and salinity values
(see "Altitude Compensation" and "Salin­ity Compensation" sections for details).

Notes: • The instrument must also be cali-

brated whenever the probe, the mem­brane or the electrolyte solution are
changed.

• To exit the calibra­tion mode at any
time, press the CAL
key.

CAL

CAL

FUNCTION

1514

SETTING

DATE, TIME & PRINTING INTERVAL

Turn the instrument on by
pressing the ON/OFF key and
wait for the "Cond" message
to disappear.

Press the FUNCTION key twice and the dis­play will show "F1".

Press the CAL key and the display will show
the date setting.

Press the CAL key again and the year will
start blinking on the secondary LCD.

Use the UP or DOWN keys to set the year.

When the correct year is selected, press the
CAL key. The month will start blinking.

CAL

DATE

DATE

UPDOWN

ON/OFF

DATE

FUNCTION

taking into account the lower degree of oxy­gen solubility in such conditions (see "Alti­tude Compensation" and "Salinity Compen­sation" sections for details).

Remember to set altitude and/or salinity be­fore taking ppm measurements, and the meter
will automatically compensate for these fac­tors.

TEMPERATURE READINGS

The supplied probe is provided with a built-in
temperature sensor.

Press the FUNCTION key to display the
measured temperature.

Allow the probe to reach the thermal equilib­rium before taking any measurement. This
can take several minutes. The greater the
difference between the temperature at which
the probe was stored and the temperature of
the sample, the longer the time will be.

If the display shows "°C ---.-", the D.O. probe
is not properly connected. This can also indi­cate a broken probe cable.

FUNCTION

°C

°C

CAL

CAL

1716

To select the hour, press the UP or DOWN
keys (24 hour clock).

Press CAL and the minutes will start blinking.

Use UP or DOWN keys to set the minutes.

Press the CAL key to confirm the selected
time and printing interval.

Press the FUNCTION key to leave the time
setting mode.

Press the FUNCTION key again to display
D.O. readings.

Selected time, date and printing interval are
now stored in the memory even when the
display is switched off.

TO VIEW DATE / TIME / TEMPERATURE

To view the temperature, press FUNCTION.
To view the date, press the FUNCTION key

to display "F1" and then press CAL.
To view the time, press the FUNCTION key

until the display shows "F2" and then press
CAL. This also displays the selected prinitng
interval.

Press the FUNCTION key until the display
returns to the D.O. readings.

TIME

INTV

TIME

INTV

CAL

CAL

UPDOWN

Set the month with the UP or DOWN keys.

Press CAL, and the day will start blinking.

Use the UP or DOWN keys to set the day.

Press CAL to confirm the selected date, then
FUNCTION to leave the date setting mode.

Press FUNCTION key again to display "F2".

Press CAL and the display will show the
time and printing interval setting.

Press the CAL key again and the printing
interval will start blinking.

Any interval can be selected from among 1,
2, 5, 10, 15, 30, 60, 120 or 180 minutes by
using the UP and DOWN keys.
Set the desired interval by pressing the CAL
key once and the hour starts blinking.

UPDOWN

DATE

TIME

INTV

TIME

INTV

UPDOWN

CAL

FUNCTION

FUNCTION

CAL

CAL

CAL

UPDOWN

1918

a- Current log number
b- Current sample number (in that log)
c - Date (DD-MM-YY)
d- Printing interval indicator in minutes
e- Time (HH.MM)
f - D.O. value in ppm
g- Temperature value in °C.

When the meter is in record­ing mode, "LOG" is displayed
on the LCD with the tempera­ture value.

Notes:

• It is recommended to use an external
power supply during recording mode, es­pecially when many printouts are required.

• Before proceeding with recording, make
sure there is enough paper. When the
paper is finished, the meter will not advise
the operator and printouts could be lost.

• It is possible to insert a new paper roll
during recording session (see "Printer
Maintenance" section).

• If PRINT is pressed while
in recording mode, a print­out is produced without af­fecting the running sample
number.

• Once in recording mode, the printing inter­val cannot be changed. Exit the recording
mode by pressing the
RECORD key, before set­ting the new interval.

TO STOP RECORDING

In order to quit the recording mode, press the
RECORD key. This will generate a recording
exit status printout.

10-01-96

==07== 0005M

0016 *16.25
#1 20.0 °C
#2 57.3 °C..

Log number

Total sample number

LOG EXIT
Date/Time

PRINT

°C

LOG

RECORD

To print the measured values, press
the PRINT key.

The printout provides the following informa­tion:
a- Current sample number
b- Date (DD-MM-YY)
c - Time (HH-MM)
d- D.O. value in

ppm.

e- Temperature

value in °C.

RECORDING MODE (PROGRAMMED
PRINTOUTS)

Press the RECORD key to enter the record­ing mode. The log number and the interval
time will be displayed for a few seconds to
indicate the correct operational mode.

The meter will print the measurement taken
in that moment, and will print at
the interval selected thereafter un­til the RECORD key is pressed.

Each printout provides the following informa­tion:

PRINT

LOG

RECORD

RECORD

PRINTING / RECORDING WITH HI 9141

a
b

c
d
e

<>

14-01-96

0015 *00.50

8.1 ppm

20.4 °C

<>

a
b

c
d
e
f
g

14-01-96

--02-- 0005M
0003 *15.50

8.5 ppm

25.4 ºC

2120

a- Current log number
b- Current sample number (in that log)
c - Date (DD-MM-YY)
d- Printing interval indicator in minutes
e- Time (HH-MM)
f - DO value in ppm
g - Temperature value

in °C

To continue logging without printing, press
CAL. The "LOG" symbol will start blinking
and no printout will be generated.

To restart printing, press the CAL key again.

Notes:

• Once in logging mode, the
interval cannot be changed.
First exit the logging mode
by pressing the LOG key,
then set the new interval.

• If PRINT is pressed while
in logging mode, a print­out is produced without af­fecting the running sample
number.

PRINT

CAL

LOG

LOG

To print the measured values
shown on display, press the
PRINT key.

This function can be activated in normal op­eration mode as well as during logging.

When in measurement mode, the printout
provides the following information:
a- Current sample number
b- Date (DD-MM-YY)
c - Time (HH-MM)
d- DO value in ppm
e - Temperature value

in °C

LOGGING MODE

This function is suggested when remote mea­surements have to be taken automatically
without the necessity of an operator and for a
long period of time. In this mode data will be
stored directly into memory.

Set the appropriate logging interval, then press
the LOG key to enter the logging mode. The
log number and page number will be dis­played for a few seconds to indicate the
correct operational mode.

The printer will print a complete set of data
and the "LOG" symbol appears on the LCD.

The printout provides the following informa­tion:

PRINT

PRINTING / LOGGING WITH HI 91410

a
b

c
d
e

14-01-96

0001 *16.50

8.95 ppm

20.4 °C

<>

LOG

LOG

Log number

Page Number

14-01-96

--02-- 0005M
0001 *16.50

8.95 ppm

20.4 °C

<>

a
b

c
d
e
f
g

LOGGING MODE WITH PRINTING

This function is suggested when an immedi­ate report of measurement is required in addi­tion to the recording of the data into memory.

Press the LOG key. The log number and
page number will be displayed for a few sec­onds on the display to indicate the correct
operational mode.

2322

PRINT

CAL

LOG

LOG

The printer will print a complete set of data
and the "LOG" symbol is displayed.

Each printout provides the following informa­tion:
a- Current log number
b- Current sample number (in that log)
c - Date (DD-MM-YY)
d- Printing interval indicator in minutes
e- Time (HH-MM)
f - DO value in ppm
g- Temperature

value in °C

It is always possible to switch from the log­ging with printing function to the logging func­tion. Press the CAL key and the "LOG" sym­bol will start blinking to indicate that the data
are now stored only into memory.

Notes:

• It is recommended to use the external power
supply during logging with printing mode,
especially when many printouts are
required.

• Before proceeding with logging with print­ing, make sure there is enough paper for
your measurements. When the paper is
finished the meter will not advise the op­erator and the printouts could be lost.
Anyway, data will continue to be stored
into the meter memory.

• It is possible to insert a new paper roll
during logging session (see "Printer
Maintenance" section for details).

14-01-96

--03-- 0010M
0001 *19.10

8.02 ppm

22.1 °C

<>

a
b

c
d
e
f
g

• Once in logging mode, the
interval cannot be changed.
First exit the logging mode
by pressing the LOG key,
and then set the new in­terval.

• If the PRINT key is
pressed while in logging
mode, a printout is pro­duced without affecting the
running sample number.

TO STOP LOGGING

Press the LOG key, this will generate a log
exit status printout.

10-01-96

==07== 0005M

0016 *16.25
#1 20.0 °C.

Log number

Total sample number

LOG EXIT
Date/Time

14-01-96

- -09- - 0001M
0016 *20.00

<>

2524

FUNCTION

UPDOWN

ALTITUDE COMPENSATION

Press the FUNCTION key twice and “F1” will be
displayed.

Use the UP and DOWN keys to set the altitude
between 1 and 1900 m, in steps of 100 m
(1 meter = 3.28 feet).

Altitude affects the disssolved oxygen concen­tration by decreasing its value. The following
table reports the maximum oxygen solubility at
various temperatures and altitudes.

FUNCTION

UPDOWN

35 g/L

9.0

8.6

8.3

8.0

7.6

7.4

7.1

6.9

6.6

6.4

30 g/L

9.3

8.9

8.6

8.2

7.9

7.6

7.3

7.1

6.8

6.6

°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

Salinity (g/L) at Sea Level

°F

50.0

53.6

57.2

60.8

64.4

68.0

71.6

75.2

78.8

82.4

°C

0
2
4
6

8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40

0 m

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

300 m

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

600 m

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

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

°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

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

Altitude, Meters above Sea Level

TEMPERATURE COMPENSATION

The DO probe features a built-in temperature
sensor, so that DO readings are automati­cally compensated for temperature effects.

SALINITY COMPENSATION

Press FUNCTION key until “F2” is displayed.

Use the UP and DOWN keys to set the salinity
between 0 and 40 g/L.

Salinity affects the dissolved oxygen concen­tration by decreasing its value. The table below
shows the maximum solubility of oxygen at
various temperature and salinity.

2726

• Make sure that the rubber O-ring sits
properly inside the membrane cap.

• With the sensor facing down, slowly
screw the membrane cap clockwise.
Some electrolyte will overflow.

The platinum cathode 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. 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.

Afterwards, rinse the probe with deionized
or distilled water, and install a new mem­brane cap using fresh electrolyte and fol­low the above procedure.

Re-calibrate the instrument.
Important: For accurate and stable mea-

surements, it is important that the surface
of the membrane is in perfect condition.
This semipermeable membrane isolates the
sensor elements from the environment but
allows oxygen to enter. If any dirt is ob­served on the membrane, rinse carefully
with distilled or deionized water. If any
imperfection still exists, or any damage is
evident (such as wrinkles or tears-holes),
the membrane should be replaced.

Make sure that the O-Ring sits properly in
the membrane cap.

PROBE & MEMBRANE MAINTENANCE

The DO probe body is made of reinforced
plastic for maximum durability.
A built-in thermistor temperature sensor pro­vides temperature measurements. It is al­ways recommended to keep the protective
cap on the probe when it is not used, to
provide protection against damage and dirt.

To replace the membrane or refill with
electrolyte, proceed as follows:

• Remove the protective
cap by gently twisting
and pulling it off the
probe body (fig.1).

• Unscrew the membrane
cap by turning it coun­terclockwise (fig.2).

• Wet the sensor by
soaking the bottom (2.5
cm / 1") of the probe
in HI 7041S electrolyte
for 5 minutes.

• Rinse the new mem­brane (HI 76407A, sup­plied with the meter)
with electrolyte solution
while shaking it gen­tly. Refill with fresh
electrolyte solution.

• Gently tap the sides of
the membrane cap with
your finger to ensure
that no air bubbles re­main trapped. Do no di­rectly tap the bottom
with your finger as this
will damage the mem­brane.

TWIST

AND

PULL

fig. 1

UNSCREW

fig. 2

2928

Data transmission from the instrument to the
PC is handled with the HI 92000 Windows

®

compatible software by HANNA instruments®.
HI 92000 allows you to use the powerful

means of the most common spread sheet
programs (e.g. Excel©, Lotus 1-2-3©).

Simply run your favorite spread sheet and
open the file downloaded by HI 92000. It is
possible to make any elaboration available
with your software (e.g. graphics, statistical
analysis).

HI 92000 offers a variety of features and has
an on-line help to support the user throughout
any situation.

To install HI 92000 you need a 3.5" drive and
a few minutes to follow the instructions con­veniently printed on the disk label.

Windows® is registered Trademark of "Microsoft Co."
Excel© Copyright of "Microsoft Co."
Lotus 1-2-3© Copyright of "Lotus Co."

Press the FUNCTION key until "F2" is dis­played on the secondary LCD.

Place the instrument on the HI 9200 infrared
transmitter (ensuring that the infrared LEDs
of meter and interface match). The memory
can be downloaded to your PC through a
serial port.

During the data transfer the
instrument displays the "r 232"
message.

Using the HI9200 infrared transmitter, all re­corded data can be fed to your PC for easy
reproduction, storage or elaboration without
any interference from cables or cords be­tween meter and transmitter.

FUNCTION

FAULT FUNCTIONS

HI 9141 and HI 91410 are factory programmed

to automatically diagnose a fault, that is dis­played with the corresponding error code.

Error codes:
PEr 0, PEr 1, PEr 2 = Short circuit on the

system, the meter should be returned
for repair. Contact your dealer

PEr 3 =Printer mechanism fault. Repair

needed, contact your dealer.

PEr 4 = Printer clutch jammed. Reset printer

(see "Printer Maintenance" section).

PEr 9 = Printer jammed. Reset printer (see

"Printer Maintenance" section).

DATA TRANSFER TO PC (HI 91410)

3130

PAPER

PRINTER MAINTENANCE

CHANGING THE INK CARTRIDGE

When printouts become faint, it might be
necessary to change the ink cartridge. Con­tact your dealer or the nearest HANNA Office
for technical service.

INSERTING PAPER ROLL

HI 9141 and HI 91410 use plain 38 mm wide

paper rolls. To insert a new roll gently pull out
the printer cover.

Take out the used paper cylinder.
Insert the paper edge in the printer slot and

feed the paper through by pressing the PA­PER key.

Allow about 5 cm (2") of paper to exit from
the printer and then replace the cover.

MEMORY ORGANIZATION

(HI91410 ONLY)

Capacity: 8000 data samples, divided into

16 pages.

Data capacity per page:

500 data samples.

Each time a new logging period starts, it
automatically starts from a new page.

If “LOGGING” is still on, and the available
page is “0” the meter will overwrite the first
LOT DATA in the existing meter memory.
During logging the meter automatically re­turns to the oldest page in the memory and if
it contains data, it will overwrite it. In this
case the first log will not correspond to the
oldest set of data.

It is recommended to periodically “clean” the
memory. Save the data on your PC if you
need to keep a record and then disconnect
the batteries for about 1 minute. Afterwards,
remember to re-set the date, time, altitude
and salinity.

WARNING

If batteries need to be replaced and data is
not to be lost, power the meter through a
12Vdc adapter before proceeding with battery
replacement.

Once batteries have been changed, the ex­ternal power supply can be disconnect without
losing the previously memorized data.

3332

When batteries become
weak, the "LO BAT" indica­tion is displayed to warn the
user. If it blinks during printing, it means that
200 printouts can be made before the batter­ies are exhausted. When there is only suffi­cient power for 100 printouts, the "LO BAT"
indication is displayed continuously.

Battery replacement must only take place in
a safe area and using the battery type specified
in this instruction manual.

To replace the
batteries, simply
remove the two
screws on the
rear cover of the
instrument and
replace the four

1.5V AA batteries
with new ones,
while paying at­tention to the cor­rect polarity.

A 12 Vdc power source can also be used to
power the unit.

Note: The instrument uses the following con­figuration.

It is recommended to use the HANNA
HI710005 or HI710006 voltage adapters with
the proper polarity configuration.

LO BAT

°C

+

+

-

-

TO RESET THE PRINTER

Take off the battery
compartment cover
by removing the
screws on the back
of the meter.

Using a sharp pen­cil press the black
reset button. This
will reset the print­ing mechanism.

Before replacing the battery cover, investigate
likely cause of the printer jam (e.g. the paper
might be caught under the cover preventing
the paper from advancing).

Replace the battery cover and tighten the
screws.

-

-

+

+

1.5V

1.5V

-

-

+

+

1.5V

1.5V

SCREW

POTS

RESET

-

-

+

+

1.5V

1.5V

-

-

+

+

1.5V

1.5V

SCREW

POTS

RESET

BATTERY REPLACEMENT

3534

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 76407A/P Spere membrane (5 pcs)
HI 7041S Refilling electrolyte solution,

30 m L

HI 710005 115 Vac/12 Vdc power adapter
HI 710006 230 Vac/12 Vdc power adapter
HI 710034 Paper roll (10 pcs)
HI 710035 Ink cartridge
HI 9200 Infrared transmitter
HI 92000 Windows® compatible software

Windows® is registered Trademark of "Microsoft Co."

Recommendations for Users

Before using these products, make sure that they are entirely
suitable for the environment in which they are used.

Operation of these instruments in residential area could cause
unacceptable interferences to radio and TV equipments, 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
voltages at the measurement surface exceed 24 Vac or 60 Vdc.

To avoid damages or burns, do not perform any measurement in
microwave ovens.

In particular cases the meters could turn off. In such cases, the
meters can be turned on by pressing the ON/OFF key.

HI9141 and HI91410 can also be used with
other adapters. In this case, remember to
check the correct polarity of your adapter
before connecting it to the meter.

WARNING: In HI91410, if the external power

supply and batteries are discon­nected, all stored data will be
erased. Always apply external
power supply to the instrument
before replacing the batteries, to
prevent data from being lost.

36

MANDOPRNR2 09/05

SALES AND TECHNICAL SERVICE CONTACTS

Australia:

Tel. [phone] • Fax [phone]

China:

Tel. [phone] • Fax [phone]

Egypt:

Tel. & Fax [phone]

Germany:

Tel. [phone] • Fax [phone]

Greece:

Tel. [phone] • Fax [phone]

Indonesia:

Tel. [phone] • Fax [phone]

Japan:

Tel. [phone] • Fax [phone]

Korea:

Tel. [phone] • Fax [phone]

Malaysia:

Tel. [phone] • Fax [phone]

Singapore:

Tel. [phone] • Fax [phone]

South Africa:

Tel. [phone] • Fax [phone]

Taiwan:

Tel. [phone] • Fax [phone]

Thailand:

Tel. [phone] • Fax [phone]

United Kingdom:

Tel. [phone] • Fax [phone]

USA:

Tel. [phone] • Fax [phone]

For e-mail contacts and complete list of Sales and
Technical offices, please see www.hannainst.com