Hanna Instruments HI 91410 User 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
DISSOLVED OXYGEN 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.
DearCustomer,
ThankyouforchoosingaHANNAproduct.
Please read this instruction manual carefully
beforeusingtheinstrument.
Thismanualwillprovideyouwithalltheneces-
saryinformation fora correctuse.
Ifyouneedadditionaltechnicalsupport,donot
hesitatetoe-mailusat[email protected]
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.............................. 24
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.
Ifunderwarranty, report the model number,dateof
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 Autho-
rization 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
62
9
8
10
7
HI 9141 and HI 91410 are portable, printing
DO meters designed for continuous monitor-
ing 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 perma-
nent 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 fea-
ture, both meters automatically compensate
for altitude (from 0 to 1900 meters) and salin-
ity (from 0 to 40 g/L).
The dissolved oxygen probe has a membrane
covering the polarographic sensors and a built-
in 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 re-
acts 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. Probeandpoweradaptersockets
2. UPkey,tosetdate,time,printinginterval,
altitude & salinity factors
3. DOWN key, to set date, time, printing
interval, altitude & salinity factors
4. PRINT key,to printon-demand
5. LOG key, to enter/exit logging mode
6. LiquidCrystalDisplay(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
temperaturemode,andforcompensation
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
DISSOLVED OXYGEN METER
HI 91410
RANGE
O
2
0. . . 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
DISSOLVED OXYGEN 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 Prepara-
tion" 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-condition-
ing (polarization) mode. Once the "Cond" dis-
appears, 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 auto-
matically switched off after 4 hours of non-
use. 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) O2
0.0 to 50.0°C
Resolution 0.01 ppm (mg/L) O2
0.1°C
Accuracy ±1.5% FS (O2)
±0.5°C
TypicalEMCDeviation
±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)
AltitudeCompensation
0 to 1900 m (resolution 100 m)
SalinityCompensation
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(HI91410only)Interval
Selectable at
1, 2, 5, 10, 15, 30, 60, 120 or 180 min.
PCConnection(HI91410 only)
RS232 port with HI 9200 transmitter
and HI 92000 software (not included)
PowerSupply
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 po-
larization 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 oxy-
gen 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 solu-
tion. 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 mea-
surements (see page 10), i.e. the mem-
brane cap is filled with electrolyte, the
probe is connected to the meter and prop-
erly polarized.
• Switch the meter on by pressing ON/OFF.
The "Cond" message appears on the dis-
play to inform that the probe is in auto-
conditioning (polarization) mode.
• Once the "Cond" disappears, the instru-
ment 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 fol-
lows:
1. Remove the red & black plas-
tic cap. This cap is for ship-
ping 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 mem-
brane cap with
your finger to en-
sure that no air
bubbles remain
trapped. To avoid
damaging the
membrane, do not
tap the membrane
directly on the bot-
tom.
5. Make sure that the rubber O-ring sits prop-
erly 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 mem-
brane 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. Im-
merse 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 wa-
ter movement of 0.3 m/sec is required. This
is to ensure that the oxygen-depleted mem-
brane surface is constantly replenished. A
moving stream provides adequate circulation.
During field measurements, this condition may
be met by manually agitating the probe. Ac-
curate 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 con-
centration of the dissolved oxy-
gen directly in ppm (mg/L).
If the sample contains significant salinity
concentration or measurements are per-
formed at an altitude different from sea
level, the readout values must be corrected,
• For an accurate calibra-
tion, it is recommended
to wait for 5-10 minutes to
ensure precise condition-
ing of the probe.
• Remove the protective
cap.
• Press the CAL key. The "CAL" message
is displayed to indicate that the calibra-
tion mode has been entered.
• The instrument will automatically standard-
ize itself to the actual saturation value and
after approximately 1 minute, will show
the ppm value corresponding to the maxi-
mum oxygen level soluble in water at that
particular temperature, altitude and salin-
ity (previously set).
Once the ppm value is dis-
played, 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 "Salin-
ity Compensation" sections for details).
Notes: • The instrument must also be cali-
brated whenever the probe, the mem-
brane or the electrolyte solution are
changed.
• To exit the calibra-
tion 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 dis-
play 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 oxy-
gen solubility in such conditions (see "Alti-
tude Compensation" and "Salinity Compen-
sation" sections for details).
Remember to set altitude and/or salinity be-
fore taking ppm measurements, and the meter
will automatically compensate for these fac-
tors.
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 equilib-
rium 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 indi-
cate 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 record-
ing mode, "LOG" is displayed
on the LCD with the tempera-
ture value.
Notes:
• It is recommended to use an external
power supply during recording mode, es-
pecially 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 print-
out is produced without af-
fecting the running sample
number.
• Once in recording mode, the printing inter-
val cannot be changed. Exit the recording
mode by pressing the
RECORD key, before set-
ting 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 informa-
tion:
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 record-
ing 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 un-
til the RECORD key is pressed.
Each printout provides the following informa-
tion:
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