Hanna Instruments HI 2400 User manual

1
0
Instruction Manual
HI 2400
Microprocessor
Dissolved Oxygen
Bench Meter
ppm
HI2400
Logging DO Meter
Functions
SETUP
LOG
RANGE
CFM
CAL
Confirm Value
CFM
Change Value
/
Select Logging
LOG
View / Setup Parameters
SETUP
Start DO Calibration
CAL
Select DO Measurement
RANGE
www.hannainst.com

2
WARRANTY
HI 2400 is guaranteed for two years against defects in workmanship and
materials when used for their intended purpose and maintained according to
instructions. The electrodes and the probes are guaranteed for a period of six
months. This warranty is limited to repair or replacement free of charge.
Damage 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 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 Authori-
zation number from the Technical Service department and then send it with
shipping costs prepaid. When shipping any instrument, make sure it is
properly packaged for complete protection.
Dear Customer,
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using the instrument.
This manual will provide you with the necessary information for correct use of
the instrument, as well as a precise idea of its versatility.
If you need additional technical information, do not hesitate to e-mail us at
[email protected] or turn to the back cover for our worldwide contact list.
This instrument is in compliance with directives.
TABLE OF CONTENTS
PRELIMINARY EXAMINATION ........................................................................................... 3
GENERAL DESCRIPTION.................................................................................................... 3
PROBEFUNCTIONALDESCRIPTION...................................................................................4
HI2400 FUNCTIONAL DESCRIPTION ................................................................................ 5
HI2400SPECIFICATIONS.................................................................................................6
OPERATIONALGUIDE ....................................................................................................... 7
D.O.CALIBRATION.................................................................................................................10
TEMPERATURE CALIBRATION (for technical personnel only) ............................................ 12
SETUP.................................................................................................................................13
LOGGING.............................................................................................................................18
PCINTERFACE....................................................................................................................20
PROBE&MEMBRANEMAINTENANCE..............................................................................25
ACCESSORIES......................................................................................................................26

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2
PRELIMINARY EXAMINATION
HI2400 is a logging microprocessor-based DO/Temperature bench meter.
It can store up to 99 lots in memory, with up to 8000 readings. These readings
can be transferred to a computer for elaboration or permanent storage.
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 Teflon®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.
Remove the instrument from the packing material and examine it carefully to
make sure that no damage has occured during shiping. If there is any
damage, notify your Dealer or the nearest Hanna Customer Service Center.
Each instrument is supplied with:
•HI 76407/2 D.O. probe with 2 m (6.7') cable
•HI 76407A membrane cap (2 pcs)
•HI 7041S electrolyte solution (30 ml)
•12 VDC power adapter
•Instruction Manual
Note: Save all packing material until you are sure that the instrument
functions correctly. All defective items must be returned in their original
packing with the supplied accessories.
GENERAL DESCRIPTION
Teflon®is registered Trademark of “Du Pont de Nemours & Co.”

4
PROBE FUNCTIONAL DESCRIPTION
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 Teflon®Membrane
10. Membrane Cap
7
8
10
9
3
4
1
2
4
5
6

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HI 2400 FUNCTIONAL DESCRIPTION
1) Liquid Crystal Display (LCD).
2) CAL key, to enter/exit calibration mode.
3) CFM key, to confirm different values.
4) key, to select the calibration value or to decrease other parameters.
5) key, to select the calibration value or to increase other parameters.
6) SETUP key, to enter/exit SETUP mode.
7) LOG key, to store measured data.
8) RANGE key, to select the measurement unit or to switch the focused data.
9) ON/OFF switch.
10) Power supply socket.
11) D.O. probe connector.
12) RS232 serial communication connector.
10
RS232
PROBEPOWER
12VDC
Front Panel
Primary LCD
Secondary LCD
1
2
4
6
3
11
Rear Panel
8
9
5
7
12
ppm
HI2400
Logging DO Meter
Functions
SETUP
LOG
RANGE
CFM CAL
Confirm Value
CFM
Change Value
/
Select Logging
LOG
View / Setup Parameters
SETUP
Start DO Calibration
CAL
Select DO Measurement
RANGE

6
HI 2400
SPECIFICATIONS
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6
OPERATIONAL GUIDE
POWER CONNECTION
Plug the 12 VDC adapter into the power supply socket.
Note: This instrument use non volatile memory to retain the calibration
parameters and all the other settings even when unplugged.
Note: Make sure a fuse protects the main line.
PROBE CONNECTION AND PREPARATION
To take measurements, connect the D.O. 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 gen-
tly. 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 8),
use the protective transparent cap supplied in the kit
with the meter.
Shipping
cap
black
red
FILL FIRST
THEN TAP
THEN SCREW
BACK ON

8
INSTRUMENT START-UP
•Turn the instrument on by pressing the ON/OFF switch.
•All LCD tags are displayed and a beep is generated while the instrument
performs self test.
•After a few seconds “Cond” message appears on the LCD 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.
•If the probe is disconnected, the meter will display “----”.
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 recur-
ring degree of accuracy.
With the probe properly polarized, oxygen is continually consumed when it
passes through the sensitive diaphragm and dissolves in the electrolyte solu-
tion 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.
The calibration of this instrument is very simple.
Before proceeding with the calibration, make sure the probe is ready for
measurements (see page 7), i.e. the membrane cap is filled with electrolyte
and the probe is connected to the meter and properly polarized.
For an accurate calibration, it is recommended to wait at least 15 minutes to
ensure precise conditioning of the probe.
Keep the protective cap on during polarization time and remove it for calibration
and measurements. Follow the calibration procedure (see page 10).
ppm
s
m
INTVDATETIME%
BUF
WRONG
CFM
NaCl
LOGCAL
ppm
g / l

9
8
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 14-16).
Remember to set the altitude and/or the salinity before taking any D.O.
measurements. The meter will automatically compensate for these factors.
D.O. 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 %) is displayed on the primary LCD and
the temperature on the secondary LCD.
•Press RANGE to change the reading from % to ppm and vice-versa.
For accurate Dissolved Oxygen measurements, a water movement of 0.3 m/s
is required. This is to ensure that the oxygen-depleted membrane surface is
constantly replenished. A moving stream will provide adequate circulation.
The use of a magnetic stirrer to ensure a certain fluid velocity is recommended.
TEMPERATURE MEASUREMENTS
The probe has a built-in temperature sensor.
The measured temperature is indicated on the secondary LCD as shown above.
Allow the probe to reach thermal equilibrium before taking any measurement.
This can take several minutes. The greater the difference between the tem-
perature at which the probe was stored and the temperature of the sample,
the longer the time will be.
Note: If “----” is displayed, the D.O. probe is not properly connected or the
temperature is out of range. This also indicates the posibility of a
broken probe cable.
ppm
%

10
D.O. CALIBRATION
Calibrate the instrument frequently, especially if high accuracy is required.
The instrument can be calibrated in maximum 2 points: 0.0% (zero calibra-
tion) and 100.0% (slope calibration).
The zero calibration of the HI 2400 is very stable, therefore this procedure
needs to be performed only whenever the probe or the membrane is replaced.
However, because the slope calibration is more critical, it is recommended to
perform this procedure every week.
INITIAL PREPARATION
•Pour small quantities of HI 7040 Zero Oxygen
solution into a beaker. If possible, use a plastic
beaker to minimize any EMC interferences.
•Make sure the probe is ready for measurements (see probe preparation on
page 7), i.e. the membrane is filled with electrolyte and the probe is
connected to the meter.
•Switch the meter on by pressing the ON/OFF switch.
•For an accurate calibration, it is recommended to wait
for at least 15 minutes to ensure precise conditioning of
the probe.
•Remove the protective cap from the D.O. probe.
•Set the appropriate altitude factor (see page 14). Make
sure the salinity factor is set to zero (see page 13).
ZERO CALIBRATION
•Submerge the probe into HI 7040 zero oxygen solution
and stir gently for 2-3 minutes.
•Press CAL. The “~” tag will blink on the LCD until the
reading is stable.
•When the reading is stable, “CFM” starts blinking. Press
CFM to confirm the “0.0%” D.O. calibration.
•If the reading is within the limits (±15% f.s.), the
meter stores the value (and adjusts the slope point).
HI 7040
HI 7040
CFM
BUF
CAL
CFM
BUF
CAL %

11
10
CAL
OR
CFM
BUF
CAL
CFM
CAL
WRONG
BUF
CAL
WRONG
•Press CAL. The instrument will return to measure-
ment mode and will memorize the zero calibration
data. For a two-point calibration do not press CAL
and follow the procedure below.
SLOPE CALIBRATION
It is suggested to perform the slope calibration in air.
•Rinse the probe in clean water to remove any residual
zero oxygen solution.
Note: If you did not perform the zero calibration proce- dure, press CAL
and then the ARROW keys to select the 100% D. O. calibration point.
•Dry the probe tip and allow a few seconds for the LCD reading to stabilize.
The “~” tag will blink until the reading is stable.
•When the reading is stable, “CFM” tag starts blinking. Press CFM to confirm
the “100.0%” D.O. calibration.
•If the reading is within the limits (±15% f.s.), the meter
stores the value (and adjusts the slope point).
•The instrument stores the slope calibration data and
returns to measurement mode.
Note: •If the reading is not close to the selected value, “WRONG “
and “WRONG ” tags will blink alternatively.
•HI 2400 has automatic buffer recognition function. If the ARROW
keys are pressed to select the desired calibration value, the automatic
buffer recognition function is disabled.
BUF
CAL %

12
Each meter has been factory calibrated for temperature with the supplied D.O.
probe and is ready for measurements.
The D.O. probes are interchangeable and no temperature calibration is
needed.
If the temperature measurements are not accurate, temperature recalibration
should be performed.
For an accurate recalibration, contact your dealer or the nearest Hanna
Customer Service Center, or follow the procedure below.
•Prepare a vessel containing ice and water and another one containing hot
water (at a temperature of around 50 °C). Place insulation material
around the vessels to minimize temperature changes.
•Use a ChecktempC or a calibrated thermometer with a resolution of 0.1
°C as a reference thermometer. Connect the HI 76407/2 D.O. probe to the
appropriate socket.
•With the instrument off, press and hold down CAL, then power on the
instrument. The "CAL" tag will appear and the secondary LCD will show
0.0 °C.
•Immerse the D.O. probe in the vessel with ice
and water as near as possible to the
ChecktempC. Allow a few seconds for the probe
to stabilize.
•Use the " " or " " key to set the reading on the secondary LCD to that
of ice and water, measured by ChecktempC. When the reading is stable,
"CFM" tag starts blinking.
•Press CFM to confirm. The secondary LCD will
show 50.0 °C.
TEMPERATURE CALIBRATION
(for technical personnel only)
CAL
CAL
CFM

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12
SETUP
Setup mode allows viewing and modifying the following parameters:
•Salinity Compensation
•Altitude Compensation
•Log Interval
•Time
•Date
•Baud Rate
•Command Prefix
•Beep Status
To enter the Setup mode press SETUP while the instrument is in measurement
mode. Press SETUP again to exit SETUP mode.
Select a parameter with the ARROW keys.
Press CAL if you want to change a parameter value. The selected parameter
will blink.
Press the ARROW keys to increase or decrease the displayed value.
Press CFM to save the modified value or CAL to escape.
Press the ARROW keys to select the next/previous parameter.
SALINITY COMPENSATION SET
Press CAL when the salinity factor is displayed. The salinity factor (0 to 40
g/l) will start blinking.
Press ARROW keys to change the salinity factor value.
Press CFM to save the modified value or press CAL to escape without saving.
CFM
•Immerse the D.O. probe in the second vessel as
near as possible to the ChecktempC. Allow a
few seconds for the probe to stabilize.
•Use the " " or " " key to set the reading on
the secondary LCD to that of the hot water.
•When the reading is stable, "CFM" tag starts
blinking.
•Press CFM to confirm. The instrument returns to
measurement mode.
Note: If the reading is not close to the selected calibration point, "WRONG"
tag will blink. In this case, check if the value set on the secondary LCD
and the temperature measured with ChecktempC are close. Change
the D.O. probe or restart calibration if necessary.
NaCl
g / l

14
Cº leveLaeSta)l/g(ytinilaS Fº
l/g0 l/g01 l/g02 l/g03 l/g53
0 06.41 46.31 47.21 09.11 05.11 0.23
2 18.31 19.21 70.21 92.11 19.01 5.63
4 90.31 52.21 74.11 37.01 83.01 2.93
6 44.21 56.11 19.01 22.01 98.9 8.24
8 38.11 90.11 04.01 57.9 44.9 4.64
01 82.11 85.01 39.9 23.9 30.9 0.05
21 77.01 11.01 05.9 29.8 56.8 6.35
41 92.01 86.9 01.9 55.8 03.8 2.75
61 68.9 82.9 37.8 12.8 79.7 8.06
81 54.9 09.8 93.8 09.7 66.7 4.46
02 80.9 65.8 70.8 06.7 83.7 0.86
22 37.8 32.8 77.7 33.7 21.7 6.17
42 04.8 39.7 94.7 70.7 78.6 2.57
52 42.8 97.7 63.7 59.6 57.6 0.77
62 90.8 56.7 32.7 38.6 46.6 8.87
82 18.7 83.7 89.6 16.6 24.6 4.28
03 45.7 41.7 57.6 93.6 22.6 0.68
23 92.7 09.6 45.6 91.6 30.6 6.98
43 50.7 86.6 33.6 10.6 58.5 2.39
63 28.6 74.6 41.6 38.5 86.5 8.69
83 16.6 82.6 69.5 66.5 15.5 4.001
04 14.6 90.6 97.5 05.5 63.5 0.401
24 22.6 39.5 36.5 53.5 22.5 6.701
44 40.6 77.5 84.5 12.5 90.5 2.111
64 78.5 16.5 33.5 70.5 79.4 8.411
84 07.5 74.5 02.5 59.4 58.4 4.811
05 45.5 33.5 70.5 38.4 57.4 0.221
The salinity affects the D.O. concentration, decreasing its value. The table below
shows the maximum oxygen solubility at various temperatures and salinity levels.
Note: The relationship between salinity and chlorinity for sea water is given
by the equation below:
Salinity (g/l) = 1.80655 Chlorinity (g/l)
ALTITUDE COMPENSATION SET
Press CAL when the altitude factor is displayed. The altitude factor (0 to
4000 m, in steps of 100 m; 1 meter = 3.28 feet) will start blinking.
Press the ARROW keys to change the altitude factor value.
Press CFM to save the modified value or press CAL to escape without saving.

15
14
Cº
leveLaeSevobasreteM,edutitlA
Fº
m0 003
m
006
m
009
m
0021
m
0051
m
0081
m
0012
m
0042
m
0072
m
0003
m
0033
m
0063
m
0093
m
0004
m
0 6.41 1.41 6.31 1.31 6.21 1.21 7.11 2.11 8.01 4.01 0.01 7.9 3.9 0.9 9.8 0.23
2 8.31 3.31 8.21 4.21 9.11 5.11 0.11 6.01 2.01 9.9 5.9 2.9 8.8 5.8 4.8 6.53
4 1.31 6.21 2.21 7.11 3.11 9.01 5.01 1.01 7.9 3.9 0.9 7.8 4.8 0.8 9.7 2.93
6 4.21 0.21 5.11 1.11 7.01 3.01 9.9 6.9 2.9 9.8 6.8 2.8 9.7 6.7 5.7 8.24
8 8.11 4.11 0.11 6.01 2.01 8.9 5.9 1.9 8.8 4.8 1.8 8.7 5.7 3.7 2.7 4.64
01 3.11 9.01 5.01 1.01 7.9 4.9 0.9 7.8 4.8 1.8 8.7 5.7 2.7 9.6 8.6 0.05
21 8.01 4.01 0.01 6.9 3.9 9.8 6.8 3.8 0.8 7.7 4.7 1.7 9.6 6.6 5.6 6.35
41 3.01 9.9 6.9 2.9 9.8 5.8 2.8 9.7 6.7 4.7 1.7 8.6 6.6 3.6 2.6 2.75
61 9.9 5.9 2.9 8.8 5.8 2.8 9.7 6.7 3.7 0.7 8.6 5.6 3.6 1.6 0.6 8.06
81 5.9 1.9 8.8 5.8 1.8 8.7 6.7 3.7 0.7 8.6 5.6 3.6 0.6 8.5 7.5 4.46
02 1.9 8.8 4.8 1.8 8.7 5.7 3.7 0.7 7.6 5.6 2.6 0.6 8.5 6.5 5.5 0.86
22 7.8 4.8 1.8 8.7 5.7 2.7 0.7 7.6 5.6 2.6 0.6 8.5 6.5 4.5 3.5 6.17
42 4.8 1.8 8.7 5.7 2.7 0.7 7.6 5.6 2.6 0.6 8.5 6.5 4.5 2.5 1.5 2.57
52 3.8 0.8 7.7 4.7 1.7 8.6 6.6 4.6 1.6 9.5 7.5 5.5 3.5 1.5 0.5 0.77
62 1.8 8.7 5.7 2.7 0.7 7.6 5.6 2.6 0.6 8.5 6.5 4.5 2.5 0.5 9.4 8.87
82 8.7 5.7 3.7 0.7 7.6 5.6 2.6 0.6 8.5 6.5 4.5 2.5 0.5 8.4 7.4 4.28
03 6.7 3.7 0.7 8.6 5.6 3.6 0.6 8.5 6.5 4.5 2.5 0.5 8.4 6.4 6.4 0.68
23 3.7 0.7 8.6 5.6 3.6 1.6 8.5 6.5 4.5 2.5 0.5 8.4 7.4 5.4 4.4 6.98
43 1.7 8.6 6.6 3.6 1.6 9.5 6.5 4.5 2.5 0.5 9.4 7.4 5.4 3.4 3.4 2.39
63 8.6 6.6 3.6 1.6 9.5 7.5 5.5 3.5 1.5 9.4 7.4 5.4 4.4 2.4 1.4 8.69
83 6.6 4.6 1.6 9.5 7.5 5.5 3.5 1.5 9.4 7.4 5.4 4.4 2.4 1.4 0.4 4.001
04 4.6 2.6 9.5 7.5 5.5 3.5 1.5 9.4 7.4 6.4 4.4 2.4 1.4 9.3 9.3 4.401
24 2.6 0.6 8.5 6.5 3.5 2.5 0.5 8.4 6.4 4.4 3.4 1.4 0.4 8.3 8.3 6.701
44 0.6 8.5 6.5 4.5 2.5 0.5 8.4 6.4 5.4 3.4 1.4 0.4 8.3 7.3 7.3 2.111
64 8.5 6.5 4.5 2.5 0.5 8.4 7.4 5.4 3.4 2.4 0.4 9.3 7.3 6.3 5.3 8.411
84 7.5 5.5 3.5 1.5 9.4 7.4 5.4 4.4 2.4 0.4 9.3 7.3 6.3 5.3 4.3 4.811
05 5.5 3.5 1.5 9.4 7.4 6.4 4.4 2.4 1.4 9.3 8.3 6.3 5.3 4.3 3.3 0.221

16
The altitude affects D.O. concentration, decreasing its value. The table on the
previous page reports the maximum oxygen solubility at various temperatures
and altitudes.
LOGGING INTERVAL SET
Press CAL when the logging interval is displayed. The logging interval (1, 15,
30 s, or 1, 2, 5, 15, 30, 60, 120, 180 min) will start blinking.
Press the ARROW keys to change the logging interval value.
Press CFM to save the modified value or press CAL to escape without saving.
CURRENT TIME SET
Press CAL when the current time is displayed. The hour will start blinking.
Press the ARROW keys to change the displayed value.
Press RANGE.The minutes will start blinking.
Press the ARROW keys to change the dispayed value.
Press CFM to save the modified value or press CAL to escape without saving.
CURRENT DATE SET
Press CAL when the current date is displayed. The month will start blinking.
Press the ARROW keys to change the month.
s
LOG INTV
TIME
TIME
DATE

17
16
Press RANGE. The day will start blinking.
Press the ARROW keys to change the dispayed value.
Press RANGE.The year will start blinking on the secondary LCD.
Press the ARROW keys to change the year.
Press CFM to save the modified value or press CAL to escape without saving.
SERIAL COMMUNICATION BAUD RATE SET
Press CAL when the baud rate is displayed. The baud rate (150, 300, 600,
1200, 2400, 4800 or 9600) will start blinking.
Press the ARROW keys to change the baud rate.
Press CFM to save the modified value or press CAL to escape without saving.
SERIAL COMMUNICATION COMMAND PREFIX SET
Press CAL when the command prefix is displayed. The command prefix (0 to
48) will start blinking.
Press the ARROW keys to change the command prefix.
Press CFM to save the modified value or press CAL to escape without saving.
Note: • See the PC interface section on page 39 for a complete explanation.
• The command prefix must be 16 if HI 92000 PC software is used.
DATE
DATE

18
LOGGING
This function allows the user to log D.O. (in ppm or %) together with
temperature automatically, for long periods of time. All logged data can be
stored into a PC through the RS232 port.
The memory used for storing the logged data is divided in 16 pages. The
capacity of each page is 500 samples. The lot number goes from 1 to 99. The
maximum capacity of the log memory is 8000 samples. Each time a new lot
starts, it automatically starts from a new page. When the samples collected for
a single lot reach the limit (8000 samples) or all memory pages are occupied,
the meter stops logging automatically.
The appropriate logging interval can be set between 1, 15, 30 seconds or 1,
5, 30, 60, 120, 180 minutes (see SETUP section for details).
LOGGING THE CURRENT DATA
To start the Auto LOG mode press LOG while in measure-
ment mode.
The instrument will display for about five seconds the lot number on the
primary LCD and start message (“St” ) on the secondary LCD.
The instrument starts data logging and displays the current D.O. value on the
primary LCD and the temperature on the secondary LCD line, along with the
“LOG” tag.
BEEP STATUS SET
Press CAL when the beep status is displayed. The beep status (ON or OFF) will
start blinking.
Press the ARROW keys to change the beep status.
Press CFM to save the modified value or press CAL to escape without saving.
LOG
%
LOG

19
18
To stop the Auto LOG mode press LOG again. The instrument will display for
about five seconds the sample number on the primary LCD and the lot number
on the secondary LCD.
The instrument returns to normal measurement mode.
If the log space is full, the “FULL” message will be displayed and no more data
will be saved.
Note: •Pressing RANGE during the logging mode, the instrument
toggles between measurement reading (in ppm and %) and
sample number on the primary LCD, together with lot number
on the secondary LCD.
•While in Auto LOG mode, CAL & SETUP keys are inactive.
TO DELETE LOTS
Press CFM to enter deleting mode. If no data were logged, the instrument
displays:
Otherwise, it will display the “dEL” message on the primary LCD and the
selected lot number on the secondary LCD. The “CFM” tag will blink.
LOG
LOG
CFM
LOG

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PC INTERFACE
Data transmission from the instrument to the PC can be done with the HI 92000
Windows®compatible software (optional). HI 92000 also offers graphing and
on-line help feature.
Data can be exported to the most popular spreadsheet programs for further
analysis.
To connect your instrument to a PC, use the optional Hanna HI 920010 cable
connector. Make sure that your instrument is switched off and plug one
connector to the instrument RS232C socket and the other to the serial port of
your PC.
Note: •Other cables than HI 920010 may use a different configuration.
In this case communication between instrument and PC may
not be possible.
•If you are not using Hanna Instruments HI 92000 software,
please see the following instructions.
SENDING COMMANDS FROM PC
It is also possible to remotely control the instrument with any terminal
program. Use HI 920010 cable to connect the instrument to a PC, start the
terminal program and set the communication options as follows: 8, N, 1, no
flow control.
COMMAND TYPES
To send a command to the D.O. meter the scheme is:
<DLE> <command><CR>
CFM
LOG
LOG
Press the ARROW keys to change the lot number or press SETUP to select the
current lot number or all memorized lots to be deleted.
Press CFM to confirm deletion of the selected lot or of all memorized lots.
Note: •After all records are deleted, the instrument displays “FrEE ALL
message for a few seconds and returns to measurement mode.
•Press CAL to exit and return to normal measurement mode at
any time.