Delta OHM HD 98569 User manual

Our instruments' quality level is the results of the product continuous development. This can bring
about differences between the information written in this manual and the instrument that you have
purchased. We cannot entirely exclude errors in the manual, for which we apologize.
The data, figures and descriptions contained in this manual cannot be legally asserted. We reserve
the right to make changes and corrections without prior notice.
HD 98569
ENGLISH
REV. 1.1
22/01/2013

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HD 98569
pH – Conductivity – Dissolved Oxygen – Temperature

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1. 8-pole DIN45326 connector, input for dissolved Oxygen and temperature combined probes
with SICRAM module, or temperature only Pt100 probes with SICRAM module.
2. 8-pole DIN45326 connector, for combined pH/mV/temperature electrodes with SICRAM
module, or temperature only Pt100 probes with SICRAM module.
3. Function key F1: The key’s function is described in the bottom line of the display. In standard
measurement mode, if you press it repeatedly, it toggles the unit of measurement of the
SICRAM pH probe connected to the left input, between pH, mV, or no indication.
4. Function key F2: The key’s function is described in the bottom line of the display. In standard
measurement mode, if you press it repeatedly, it toggles the unit of measurement of the
dissolved Oxygen probe connected to the central input, between Oxygen concentration in
liquids (mg/l), saturation index (%), or no indication in absence of the connected probe.
5. MEAS (measurement) key: It allows to repeat the measurement, when the EPT = AUTO, MAN
or TIME modes are selected (see the EPT function description on page 5). It also returns to
the standard display.
6. EPT (End PoinT) key: It selects the unit of measurement. The EPT, MAN, TIME, and AUTO
modes are available (see the EPT function description on page 5).
7. LOG key: It starts and ends the saving of data in the internal memory.
8. PRINT key: It prints the data on the current screen. It uses the serial communication port
RS232C, the USB 2.0 port, or, if any, the Bluetooth connection.
9. MEM key: It stores the currently displayed screen.
10. ESC key: In the menu, it cancels the operation in progress without making changes.
11. ENTER key: In the menu, it confirms the current selection.
12. key: In the menu, it moves the cursor leftwards. During measurement, it decreases the
display contrast.
13. HELP key: It shows a description of the instrument main functions on the display.
14. Power supply input 12Vdc for the ∅5.5mm - ∅2.1mm connector. Positive at centre.
15. 8-pole female MiniDin, serial RS232C and USB1.1-2.0 multiport connector.
16. MENU key: It allows access to the menu.
17. key: In the menu, it decreases the current value.
18. key: In the menu, it moves the cursor rightwards. During measurement, it increases the
display contrast.
19. DISP key: It gives the main parameters of the probes connected to the instrument, the
barometric pressure measured by the internal pressure sensor, the next memory positions
MEM and ID, current date and time.
20. key: In the menu, it increases the current value.
21. °C/°F key: If the temperature sensor is present, the key toggles the unit of measurement
between °C and °F. If no temperature or combined temperature probes are present, the key
allows manual input of the temperature value used for temperature compensation and
selection of the unit of measurement (°C or °F). See also the description of the ATC/MTC
feature.
22. CAL key: It starts the pH electrode, conductivity probe or dissolved Oxygen probe calibration
procedure.
23. ID key: It allows to set the sample identifier number.
24. ON-OFF key: It turns the instrument on and off.
25. Function key F3:The key’s function is described in the bottom line of the display. In standard
measurement mode, if you press it repeatedly, it toggles the unit of measurement of the
conductivity probe connected to the right input, between conductivity, resistivity, TDS, NaCl
concentration, or no indication.
26. Description of the F1, F2, F3 function keys:
27. Instrument display. The display is backlit: To enable or disable the backlight, select the menu
item Menu >> System Parameters >> Backlight. Use the arrows to modify the display
contrast.
28. 8-pole DIN45326 connector, input for combined 4-ring or 2-ring conductivity/temperature
probes complete with SICRAM module (the conductivity input is not compatible with the
temperature probes with SICRAM module).

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Introduction
The HD 98569 is a multiparameter portable instrument and datalogger for electrochemical
measurements: pH, conductivity, dissolved Oxygen and temperature. It is fitted with a large
backlit LCD display.
The instrument measures:
•pH, mV, redox potential (ORP) using pH, redox electrodes or combined pH/temperature
probes complete with SICRAM module;
•conductivity, liquid resistivity, total dissolved solids (TDS) and salinity using combined 4-
ring and 2-ring conductivity/temperature probes with SICRAM module;
•concentration of dissolved Oxygen in liquids (in mg/l), saturation index (in %) and
temperature using SICRAM combined probes of polarographic, with two or three
electrodes, and galvanic type with integrated temperature sensor.
The immersion, penetration, or contact Pt100 temperature probes with SICRAM module can be
connected to the instrument.
•The pH electrode calibration can be carried out on a minimum of one to a maximum of five
points, and the calibration sequence can be chosen from a list of 8 buffers. The
temperature compensation can be automatic or manual.
•The calibration of the conductivity probe can be automatic, by recognition of standard solutions:
147μS/cm, 1413μS/cm, 12880μS/cm, 111800μS/cm or manual with different solutions.
•The dissolved Oxygen probe's quick calibration function guarantees timely accuracy of the
performed measurements.
•The pH, conductivity, dissolved Oxygen and temperature probes are fitted with a SICRAM
module, with the factory calibration settings already being memorized inside.
The HD 98569 is a datalogger. It stores up to 2000 single screens (labels) and up to 9000
samples in continuous recording of: pH or mV, conductivity or resistivity or TDS or salinity,
dissolved Oxygen concentration, saturation index, and temperature.
The data can be transferred from the instrument connected to a PC via the multistandard RS232C
serial port or the USB 2.0-1.1 port.
If equipped with the Bluetooth HD22BT option, the HD 98569 can send the data to a PC fitted with
the USB/Bluetooth HD USB.KL1 converter, to a printer with a Bluetooth HD40.2 interface, or to a
PC fitted with a Bluetooth input, without the need of any connection.
The RS232C serial connection can be used for direct printing of the labels using a 24 column
printer (HD40.1 or HD40.2).
The DeltaLog11 dedicated software (vers. 2.0 and later) allows management and configuration of
the instrument, and data processing on the PC.

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Display Description
When you turn the instrument on the display appears as in the figure.
The display is backlit: To enable or disable the backlight, select the menu item Menu >> System
Parameters >> Backlight.
You can adjust the contrast level: Use the  arrows to modify it.
The display is laid out as described below:
1. Battery symbol: It indicates the battery level.
2. EPT symbol: The EPT (End PoinT) symbol indicates the display mode. The mode selection is
done using the EPT key. Until the EPT is blinking, the measurement is updated on the
display; when it is fixed, the measurement is “frozen”. For a new measurement, press MEAS.
EPT = DIR: The instrument operates in continuous view mode. In this mode the displayed
measurement is updated every second (standard mode).
EPT = MAN: The displayed measurement is continuously updated until MEAS is pressed.
During the measurement update, the MAN symbol is blinking. For a new measurement, press
MEAS.
EPT = TIME: The measurement is frozen after a set time of 8 seconds. For a new
measurement, press MEAS.
EPT = AUTO: The instrument performs the measurement, and when it stabilizes the AUTO
symbol stops blinking. For a new measurement, press MEAS.
In the following figure you can see an example of the measurement process with the EPT
AUTO function enabled. After setting the EPT = AUTO function using the EPT key, the
electrode is immersed into a liquid. To perform the measurement, press MEAS. the AUTO

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symbol blinks to indicate that the measurement is in the stabilization phase. In the position
indicated by point 1, the measurement remains within a predefined stability range for 8
seconds. At the end of this interval (point 2), the instrument freezes the measurement, and
shows a stable value. The AUTO symbol stops blinking.
For a new measurement, press MEAS.
2 digit
10s
t
p
H
pH
1
The reference stability range has a span of 2 digits.
When recording is started (Logging), the EPT function switches automatically to DIR.
3. pH/mV: It reports the pH or mV value measured by the SICRAM pH probe connected to the left
input. The measurement indication blinks if the pH/mV probe is not calibrated or if the
calibration was unsuccessful (please see the DISP key description on page 9).
4. Conductivity: It reports the conductivity, resistivity, TDS, NaCl concentration value measured
by the conductivity probe with SICRAM module connected to the right input. The
measurement indication blinks if the conductivity probe is not calibrated or if the calibration
was unsuccessful (please see the DISP key description on page 9).
5. Function keys line:The bottom line is associated to the F1, F2, F3 function keys. Please see
the details in the keyboard’s description on page 6.
6. Dissolved Oxygen: It reports the dissolved Oxygen concentration value (mg/l) or saturation
index (%) measured by the dissolved Oxygen probe with SICRAM module connected to the
central input. The measurement indication blinks if the dissolved Oxygen probe is not
calibrated or if the calibration was unsuccessful (please see the DISP key description on
page 9).
7. Temperature used to compensate the pH, conductivity and dissolved Oxygen measurements.
For the details see the paragraph dedicated to temperature on page 33.
8. ATC or MTC indicate the temperature compensation type being used.
ATC means automatic compensation: If the temperature probe is present, compensation is
carried out according to this probe, or according to the temperature detected by a combined
probe, if present. In this case, you cannot modify the manually input temperature value.
For the details see the paragraph dedicated to temperature on page 33.
MTC means manual compensation: There are no temperature sensors; the temperature used
for compensation is typed using the keyboard. Press the °C/°F key once to modify its value:
The temperature indication blinks. Use the and arrows to set the desired value and
confirm with ENTER. The display stops blinking, and the temperature displayed is used for
compensation.
If the temperature probe is not present, in order to change the unit of measurement between
°C and °F, it is necessary to press the °C/°F key twice.

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Keyboard description
Each key specific function is described in detail below.
ON-OFF key
The instrument is turned on using the ON/OFF key. Press this key for at least two seconds.
When pressing ON-OFF again the instrument is turned off.
The turning on starts a self test including the detection of the probes connected to the inputs. As
the probes’ identification and calibration data are captured upon turning the instrument on,
it is necessary to connect the probes when the instrument is off. If a probe is connected
and the instrument is on, nothing is shown on the display: it is necessary to turn the
instrument off and on.
Finally, the instrument is set for normal measurement.
Once turned off, wait few seconds before turning it on to allow completion of the shut down
routine.
MEAS key
The key allows to perform or repeat a new measurement, when the EPT = AUTO, MAN or TIME
modes are selected (see the EPT function description on page 5).
It returns the instrument display to the standard measurement mode, after pressing the MEM and
DISP keys.
EPT key
The key selects the measurement performance mode. By pressing the EPT key, you can select the
DIR, MAN, TIME or AUTO modes in this order (see the EPT function description on page 5).
CAL key
It starts the pH, conductivity or dissolved Oxygen probes calibration procedure (see the chapter
dedicated to calibration on page 21).
ID key
This key allows to input the value of the first sample ID associated with the PRINT and MEM
function. Use the and arrows to select the value to be modified, and set the desired value
using the and arrows. Modify the other values in the same way. At the end, confirm with
ENTER.
The ID is an automatically increased progressive number. The identifier is indicated in the printout
and in the recorded samples together with the date, time and measured values. This parameter
can be modified only by the administrator (see page 17).
If the EPT option is set to DIR (see the EPT key in this chapter), each time the PRINT or MEM key
is pressed, the ID is increased by 1.

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If the EPT option is set to Auto, Man or Time, pressing PRINT only causes the print to occur when
the measurement has stabilized (EPT symbol still); until the measurement is frozen, it is possible to
repeat the print at will, but the sample identifier number is not increased. This is useful when more
labels concerning a single measurement must be printed with the same identification code, without
increasing the code each time.
LOG key
It starts and stops the logging of a data block to be saved in the instrument's internal memory. The
data logging frequency is set in the “System Parameters >> Memory and Logging >> Log Interval”
menu parameter. The data logged between a start and subsequent stop represent a data block.
When the logging function is on, the “NOW LOGGING!” indication and the time elapsed since the
recording beginning are displayed.
To end the logging, press LOG.
For the details see the chapter dedicated to recording on page 49.
°C/°F key
If a temperature sensor is present (temperature probe or combined probe with integrated
temperature sensor), the key changes the unit of measurement between °C and °F. If no
temperature or combined temperature probes are present, the key allows manual input of the
temperature value used for temperature compensation and selection of the unit of measurement
(°C or °F). See also the description of the EPT key.
PRINT key
It sends the displayed data to the serial RS232C or USB output as a label formatted across 24
columns.
If EPT = DIR, the ID is increased by 1 (see page 7).
Before starting the communication via the RS232C serial port, set the baud rate according to the
connected device.
•For the connection to a PC’s RS232 port, select the “System Parameters >> RS232 Baud Rate”
menu item, and select the maximum value equal to 38400 baud by using the arrows and .
Confirm by pressing ENTER.
The DeltaLog11 software (vers. 2.0 and later) for PC will automatically set the baud rate value
during connection by reading it on the instrument. If you are using a different program than
DeltaLog11, be sure the baud rate is the same for both the instrument and the PC: the
communication will only work in this way.
•For the connection to a PC’s USB port, please see the connection details on chapter 46.
•For the direct connection to a serial printer (e.g. HD40.1 or HD40.2), set the recommended baud
rate for the printer. See the details on page 50.
Note: The PRINT key can also print the data contained in the instrument's memory: Select the
data to be printed using the MEM key and press PRINT to print it.

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MEM key
It manages the single data storage. For continuous recording use the LOG key.
By pressing MEM you will enable the F1= STOR, F2=CLR and F3=VIEW commands.
F1=STOR stores the current screen. Before enabling the MEM function, you can select (using the
F1=pH/mV, F2=O2and F3=cond function keys) the variable to be stored: pH or mV, conductivity,
resistivity, TDS or NaCl, dissolved Oxygen concentration, or saturation index; using the °C/°F key,
the temperature in °C or °F. The units of measurements of the logged samples are the same as
those used on the display during recording.
F2=CLR allows clearing of the memory part dedicated to the single records stored using the MEM
>> F1 = STOR key. The message “CLEAR ALL?” is displayed: Press F3=YES to clear, F1=NO to
cancel the operation.
F3=VIEW displays the logged data: F1=PREV goes to the previous sample, F3=NEXT to the next
one. The displayed sample is indicated as “M:####”, where #### is the current sample progressive
number. To print the current data, press the PRINT key.
To return to the standard view, press MEAS.
For the details see the chapter dedicated to recording on page 49.
DISP key
The feature reports useful information on the instrument and connected probes functioning.
From top to bottom there are:
•Barometric pressure, measured by an internal pressure sensor,
•Temperature compensation type (ATC or MTC),
•Temperature compensation,
•Calibration information on the connected probes.
For the pH probe the symbol shows an electrode that gets “empty” as its efficiency decreases. If
the pH probe is not calibrated, the CAL blinking message appears.
For the dissolved Oxygen probe, the calibration coefficient (SLOPE) is reported: this value must be
between 0.500 and 1.500. A value close to 1.500 indicates an exhausted probe.
For the conductivity probe, the cell constant nominal value is shown. It has up to 4 different
calibration points and nominal cell constant corrections. The displayed value is referred to the
calibration point at 1413μS/cm.
The memory position MEM progressive number and the identification code will follow (please see
the ID key description).
In the bottom line we have the current date and time.
If a pH, conductivity or dissolved Oxygen probe has not been calibrated by the user or if the
calibration was unsuccessful, the measurement indication in the main page will blink to notify the
problem: By pressing DISP, you can check the type of problem occurred.

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Up Arrow
in the menu, it increases the current value.
ESC key
In the menu, the key clears or cancels the active function.
Right Arrow
In the menu, it moves the cursor rightwards. During measurement, it increases the display
contrast.
ENTER key
In the menu, the ENTER key confirms the current parameter.
Left Arrow
In the menu, it moves the cursor leftwards. During measurement, it decreases the display contrast.
MENU key
Using this button the instrument’s menu can be accessed. See a detailed description on page 11.
Down Arrow
In the menu, it decreases the current value.
HELP key
It displays a short help on the instrument’s main functions. Press ESC to go back to standard
measurement. Use the and arrows, to browse the HELP items. To display an item, press
ENTER.
… Function keys F1 … F3
The function of the F1, F2, F3 keys is described by the message near each key in the bottom line
of the display.

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Menu description
The MENU key is used to access the menu main screen. To select one item, use the arrow keys
(and ). The selected item has a white text on a black background.
INFO / STATUS / HELP
User Options
System Parameters
pH Options
Conductivity Options
Diss. Oxygen Options
UP/DOWN/ENTER or ESC
Press ENTER to access the selected item. Use the and arrows to browse the submenus and
modify the single parameters. Press ENTER to confirm the value of the selected parameter, press
ESC to cancel the operation: In both cases, you return to the initial menu.
Press ESC to return to the main menu from a submenu, and to exit the main menu and return to
measurement mode.
Note: Some menu parameters can be changed only by an user registered as “Administrator” (see
the details on page 17).
Language selection
The menu items are in 4 languages: Italian, English, French and Spanish. To select the language,
press MENU, use the and arrows to select User Options >> User Registration and select the
language using the MENU key. Press ESC to confirm and return to measurement mode.
The menu items are listed in this order:
1. “INFO / STATUS / HELP”
1.1. “Instrument Info” shows some information on the instrument: model, types of
measurement, firmware version, serial number and calibration date.
1.2. “Instrument Status” reports the last enabled user, the current type and status of
communication interface, the temperature compensation mode and the temperature
sensor used for compensation.
1.3. “Short Manual”. It is a short help showing the instrument main functions.
2. “USER OPTIONS”
2.1. “Logged=Admin” displays the currently registered user (see the next point)
2.2. “User Log-in” selects the language among Italian, English, French or Spanish and/or
the current user type. See the details on page 17.
2.3. “User Password” allows to create and/or edit the password associated to each
registered user: Administrator, User_1, User_2 and User_3. See the details on page
17.
2.4. “User Logoff option”: When you turn the instrument on you can get:
A) The user of the previous session without requiring a password (“Recall User”),
B) Require a user (“Request New User”): in this case, you have to select the user and,
if not “Anonymous”, enter the password. This parameter can be modified only by the
administrator (see page 17).

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3. “SYSTEM PARAMETERS”
3.1. “Date and Time” manages the instrument date and time setting. Use the and 
arrows to move the cursor, and the and arrows to edit the selected value. The
MENU key clears the seconds to synchronize them to the minute: Use the
 and
 arrows to set the current minute plus one, and as soon as that minute is reached
press MENU. This synchronizes the time to the second. Press ENTER to confirm, ESC
to exit without making changes.
3.2. “Memory and Logging” is composed of five sub-functions:
3.2.1. “Log Interval”: It sets the interval in seconds between two loggings. The interval
can be set from 0 to 999 seconds. If the value 0 is set, the logging is
disabled. Press LOG to start the logging, press LOG again to end.
3.2.2. “Single Memory Mode”: It selects the instrument memory management mode. It
applies only to the single record (MEM key): The continuous recording (LOG
key) stops when the available memory space is full.
By setting it to “0” you select the standard mode (normal): When the memory
is full, the logging stops; to carry out further recordings, you should download
the data, if necessary, and clear them.
By setting it to “1” you select the circular mode (“endless loop”): When the
memory is full, it starts to overwrite the oldest data. Recording is not
interrupted. The logging mode can be selected or modified only by the
administrator (see page 17).
3.2.3. “Memory on Print opt.”:
If you select “0”, when using PRINT the current data is sent to the printer but
is not saved in the memory.
If you select “1”, when using PRINT the current data is sent to the printer and
also saved in the memory.
This parameter can be selected only by the administrator (see page 17).
3.2.4. “Clear Log” allows to permanently clear all the data stored in the memory using
the LOG key. Press ENTER to confirm, ESC to exit without clearing the
memory.
3.2.5. “Print Log” sends all the data contained in the continuous memory to the device
connected to the serial port. The continuous recording data (using the LOG key)
are formatted across 80 columns: They cannot be printed on the HD40.1 or
HD40.2 portable printer. This command allows, for example, to send the data
to the HyperTerminal software. The DeltaLog11 software (vers. 2.0 and later)
manages the data transfer and the printing from the PC, and does not require
the use of this command.
3.3. “RS232 Baud Rate”. This function allows selection of the frequency used for the serial
RS232 communication with the PC. Values from 1200 to 38400 baud. Use the and
arrows to select the parameter and confirm with ENTER. The communication
between instrument and PC (or serial port printer) only works if the instrument
and PC or printer baud rates are the same. If the USB connection is used this
parameter value is automatically set (please see the details on page 49).
3.4. “Electrode Serial Numbers”. It identifies the serial numbers of the SICRAM probes
connected to the instrument inputs. These serial numbers are reported in the printouts
and stored data.
The SICRAM pH, conductivity and dissolved Oxygen probes report the “service hours”,
that is, the number of hours that the probe has been connected to the functioning
instrument. This parameter is saved in the SICRAM memory and cannot be modified.
3.5. “System Reset”: It is formed by two sub-functions:
3.5.1. “Partial Reset”: The partial reset restores the instrument functioning without
modifying the menu settings such as, Baud Rate, log interval, date and time…

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The data in the memory are not cleared. This operation can be carried out only
by the administrator (see page 17).
3.5.2. “Complete Reset”: The complete system reset restores the instrument to the
original factory conditions, restoring all menu parameters. After a complete
reset, the date, time, baud rate, log interval... must be set again. The data in the
memory are not cleared. This operation can be carried out only by the
administrator (see page 17).
3.6. “Backlight”. It enables or disables the display backlight. Use the arrows e , press
ESC to exit.
3.7. “Bluetooth Parameters” is displayed by the instruments fitted with the Bluetooth
HD22BT module. It is formed by three sub-functions:
3.7.1. “Disable Bluetooth module”: Select this item using the and arrows and
confirm with ENTER to disable the Bluetooth device. This function allows using
the COM serial port or the USB port.
3.7.2. “Bluetooth Connection to a PC” sets the instrument for connection to a PC fitted
with a Bluetooth interface or Bluetooth “HD USB.KL1” module. When exiting the
menu, the “BT” symbol blinks up on the left side of display to indicate that the
instrument is ready for connection using the DeltaLog11 software (vers. 2.0 and
later). The instrument waits a connection for 10 minutes, then shows an error
alternating “BT” and “ERR”. For the details, see the chapter dedicated to PC
connection on page 46.
3.7.3. “Bluetooth Connection to a Printer” sets the instrument for connection to the
HD40.2 printer fitted with a Bluetooth module. Turn on the printer, select
“Bluetooth Connection to a Printer” using the and arrows, and confirm
with ENTER. The instrument searches for all functioning Bluetooth devices and
lists them on the display. Use the and arrows to select the HD40.2 printer
and confirm with ENTER. When pressing PRINT the data are sent to the
Bluetooth printer.
4. “pH OPTIONS”
4.1. “pH Resolution” selects the number of leading digits for the pH measurement: using the
and arrows select 7.12 to obtain the pH hundredths or 7.123 to obtain the
thousandths. The chosen resolution is applied to the new logged measurements, while
the previous choice still applies for the already memorized ones.
4.2. “pH Buffer Solutions”: The instruments allows selecting up to 5 buffers for the pH
electrode calibration. Select the buffer BUFFER1, …, BUFFER5 to be modified using
the and arrows, and confirm with ENTER.
Select BUFFER
to be changed, or ESC
Buffer1 = 1.679
Buffer2 = 4.010
Buffer3 = 6.860
Buffer4 = 9.180
Buffer5 = 10.010

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In the next table, select the value to be assigned to the chosen buffer.
You can select one of the 8 buffers in the memory, enter a user defined CUSTOM
buffer, or exclude one from the list by selecting NIL. The 8 buffers in the memory are
compensated for temperature, but the buffer defined by the user is not compensated
for temperature: So the buffer value must be set at the actual solution temperature. As
an alternative, the correct value according to temperature can be set in the calibration
phase. Please see the chapter dedicated to calibration on page 21.
4.3. “pH Electrode History”: The last eight calibrations can be stored in the instrument
memory. The data are associated to the SICRAM probe serial number: The “Show on
Display” submenu displays the following items: date, time, operator that carried out the
calibration, calibration points (pH, mV and temperature detected). The last 8 calibration
information are shown: offset, slope and the symbol indicating the pH electrode
efficiency after calibration. Use the and arrows to browse the last 8 calibrations.
Use the “Print” function to print these information.
4.4. “pH Calibration Expiration”: It is possible to set the pH electrode calibration validity
number of days. When the validity period has expired, the measurement is blinking on
the display and by pressing the DISP key the “CAL” blinking message appears; the
calibration data can still be used. The “Expired calibration” message is indicated in the
printout. Enter “Number of days” = 0 to disable this feature.
Note: The day is counted at midnight: By entering 1, at midnight of the same day, the
calibration is considered expired.
This operation can be carried out only by the administrator (see page 17).
4.5. “Reset pH History”: This function clears the pH electrode calibration information in the
memory (see “pH Electrode History” above). Press ENTER to erase, ESC to exit
without erasing.
This operation can be carried out only by the administrator (see page 17).
4.6. “Advanced Settings” groups some advanced functions concerning the pH
measurement.
4.6.1. “Set Antimony Electrode”: This function allows using an antimony electrode for
pH measurement and to perform its calibration with the standard calibration
solutions. To enable it, select YES and confirm with ENTER. Select NO and
confirm with ENTER, to exit without making changes. To modify the “Iso pH”
parameters and offsets, please see the following.
4.6.2. “Isotherm pH Point” is expressed in pH units: Use the arrows to set its value
between 0pH and 14pH, and confirm with ENTER. If the parameter is
expressed in mV instead of pH, use the following formula to obtain the
corresponding value in pH:
59.16
mV
7pH_ISO −=
4.6.3. “Initial Offset” is the electrode zero point expressed in mV: Use the arrows to set
the corresponding value between -500mV and +500mV, and confirm with
ENTER.
1.679 4.000 4.010
6.860 7.000 7.648
9.180 10.010 NIL
CUSTOM

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4.6.4. “Reset Std. glass electrode”: It restores the standard pH measurement
functioning and disables the special electrode measurement correction.
Note: The “Set Antimony Electrode” function activation or the modification of the
submenu items, will erase the current calibration. When exiting the menu, you should
perform a new calibration.
5. “CONDUCTIVITY OPTIONS”
5.1. “Cond. ALFA Coefficient” (αT): The temperature coefficient αTis the percentage
measurement of the conductivity variation according to temperature and is expressed
in %/°C (or %/°F). The coefficient may vary from 0.00 to 4.00%/°C. Use the arrows (
and ) to set the desired coefficient, and confirm with ENTER.
5.2. “Reference Temperature”: It indicates the temperature to which the displayed
conductivity value is standardized. The values vary from 0 to 50°C. Usually the values
of 20°C or 25°C are used. Use the arrows (and ) to set the desired value, and
confirm with ENTER.
5.3. “Conductivity TDS”: It represents the
χ
/TDS conversion factor, that is, the ratio
between the measured conductivity value and the total quantity of dissolved
solids in the solution, expressed in mg/l (ppm) or g/l (ppt). This conversion factor
depends on the nature of the salts present in the solution. In the field of water quality
treatment and control, the main component is CaCO3 (Calcium Carbonate). For this
solution, a value of 0.5 is usually used. In agriculture, for fertilizer water preparation,
and in hydroponics, a factor of about 0.7 is used. Using the arrows (and ), set the
desired value, selecting it in the 0.4…0.8 range, and confirm with ENTER.
6. “DISSOLVED OXYGEN OPTIONS”
6.1. “View Oxy History”: The dissolved Oxygen probe SICRAM module stores the last eight
calibrations in the memory. This menu item displays each calibration date and slope.
The “Print Oxygen History” function, gives the date, slope and temperature per each
calibration.
6.2. “Oxy Calibration validity”: It is possible to set the dissolved Oxygen probe calibration
validity number of days. When the validity period has expired, the measurement is
blinking on the display and by pressing the DISP key the “CAL” blinking message
appears; the calibration data can still be used. The “Expired calibration” message is
indicated in the printout. Enter “Number of days” = 0 to disable this feature.
Note: The day is counted at midnight: By entering 1, at midnight of the same day, the
calibration is considered expired.
This operation can be carried out only by the administrator (see page 17).
6.3. “Reset Calibration History”: This function clears the dissolved Oxygen probe calibration
information (see “Dissolved Oxygen Probe Calibration History” above). Press ENTER
to erase, ESC to exit without erasing.
This operation can be carried out only by the administrator (see page 17).
6.4. “Salinity Correction”: Enter the measured liquid salinity. Use the and arrows to set
the value expressed in g/l, and confirm with ENTER. To disable the salinity
compensation, set the value to zero.
Note: The dissolved Oxygen concentration depends on the measured liquid salinity. In
contrast, salinity has no effect on the saturation index.
6.5. “Automatic Salinity Correction”: The salinity value is measured directly by the
instrument, if a conductivity probe is connected and immersed in the measured liquid.
Select “0” to manually set the correction using the “Manual Setting of the Salinity” menu
item, select “1” to enable automatic correction.

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Instrument Identifier Code
The instrument can be identified using a code appearing in the printouts and in the stored data.
This code is managed (creation, editing, erasing...) using the DeltaLog11 software (vers. 2.0 and
later) and this can be performed only by the administrator (see page 17).

- -17
User Management
The user must identify himself or herself by entering a user name and password: The registered
user name is shown in all performed operations: Printing, logging, calibration...
The available users are: Administrator, user_1, user_2, user_3 and anonymous user. The different
users have different usage levels: The Administrator is enabled to use all of the instrument
functions and assigns the password to the other users. The three users and the anonymous can
access only part of the functions.
Settings
The user management options are stored in the “USER OPTIONS” menu item.
When the instrument comes out of the factory, the only user stored is the administrator. The
password is “00000000”: The “Menu >> User Options >> User Password” function allows
modification of the administrator password.
To enable the user_1, user_2 and user_3, you must assign a different password (not “00000000”),
using the “User Password” function.
In order to do that:
1. Select the menu item “Menu >> User Options >> User Password”.
2. Select the desired user (e.g. User_1) using the  arrows, and confirm with ENTER.
3. Type the old password (“00000000” in a new instrument), and confirm with ENTER.
4. Type the new password (not “00000000”), and confirm with ENTER.
5. Select “Menu >> User Options >> User Registration” using the  arrows, and select
the new user to which you have just assigned a password.
6. Type the password, and confirm with ENTER.
Now the User_1 is enabled and can use the instrument: The printed and stored information will
show “Operator = User_1”.
Note: The passwords beginning with 27 (27000000 to 27999999) are reserved and you cannot use
them.
Access modes
If you wish the instrument to request the user selection and relevant password upon turning on, set
“Menu >> User Options >> User Exit Mode = Request New User”. When you turn the instrument
on you get all the users: Select the user using the  arrows, and type its password. Confirm
by pressing ENTER. The anonymous user does not need a password.
If you select “Recall User”, the instrument uses the previous user without requiring a password. In
this case, use the “User Registration” menu item to change the user (see points 5 and 6 above).
Note: The access mode can be modified only by the administrator.

- -18
Functions reserved to the administrator
Some functions are reserved to the user registered as "Administrator" (see the details on page 11).
Only the Administrator can:
•Modify the instrument identifier with the DeltaLog11 software (vers. 2.0 and later),
•Perform the instrument partial and total reset,
•Set the user access mode with or without password prompting (“User Exit Mode”),
•Selects the instrument memory management mode (“Single Memory Mode”),
•Set the storage mode when using the PRINT key (“Print Memory Mode”),
•Clear the calibration history (“Clear Calibration History”),
•Set the pH and dissolved Oxygen calibration interval (“pH Calibration Expiration” and
“Dissolved Oxygen Calibration Expiration”),
•Modify the ID sample value (ID key),
•Clear the memory content.

- -19
pH measurement
The HD 98569 instrument works with combined pH/temperature probes complete with SICRAM
module, pH measurement electrodes, redox potential measurement electrodes (ORP), and specific
ion electrodes combined with the SICRAM KP471 module. To switch from pH to mV and vice
versa, press the F1= pH/mV function key.
The pH measurement is generally accompanied by the temperature measurement for the
automatic compensation of the pH electrode Nernst coefficient. The SICRAM combined
pH/temperature probes are fitted with Pt100 temperature sensor.
The SICRAM KP471 module is provided for the connection of a pH electrode. For a pH
measurement compensated for according to temperature, the instrument requires a temperature
probe to be connected to the O2input. As an alternative, the compensation temperature value for
the solution being measured can be entered manually.
If a temperature only probe is connected to the instrument, it has priority on the temperature
supplied by any combined probe: Please see the chapter dedicated to temperature measurement
on page 33.
pH SICRAM probes
The SICRAM pH probe is formed by a pH electrode, a Pt100 temperature sensor located inside the
probe, and an electronic module. The module has a memory circuit that enables the instrument to
recognize the type of probe connected. It stores also the serial number, the factory calibration of
the Pt100 sensor, the manufacturing date and the parameters of the last two pH calibration
performed by the user.
The instrument stores the last eight pH calibrations performed by the user: The last two calibration
are stored in the probe’s SICRAM memory. Upon power on, the instrument reads the two
calibrations in the probe and, if the probe was calibrated on the same instrument, they are added
to the ones already stored in the instrument in order to make up the history calibration of the
SICRAM pH probe. If the SICRAM pH probe is connected to a different instrument, only the
parameters in the probe memory will make up the calibration history.
Module pH SICRAM KP471
The KP471 module is a SICRAM type interface for pH electrodes with S7 connector.
Three different cable lengths are available: 1m (code KP471.1), 2m (code KP471.2) and 5m (code
KP471.5).
By using this module you can add all of the advantages of a SICRAM probe to a pH electrode: For
example, you can move the module with the electrode from an instrument to another instrument,
without performing a new calibration.
The module is automatically recognized by the instrument when you turn it on, and the serial
number and parameters described above are read.
You just need to connect the electrode to the KP471 module S7 connector, connect the module to
the pH input, and turn the instrument on. Perform a first calibration on two or more points. One
must be in the neutral band (e.g. 6.86pH). The module is now ready for use.
Of course, once the calibration is performed, the electrode linked to the module should not
be changed: As the electrode calibration information are saved in the module, this will generate
measurement errors. When you replace the electrode you should do a new calibration.

- -20
The electrode for pH measurement
The electrode for pH measurement, generally in glass, generates an electrical signal proportional
to the pH according to Nernst law. Of this signal the following aspects are considered:
Zero point: The pH where the electrode generates a potential of 0 mV. In most electrodes, this
value is found at about 7 pH.
Offset or Asymmetry Potential: mV generated by an electrode when immersed in a buffer solution
at 7pH. Generally oscillates between ± 20 mV.
Slope: Response of the electrode expressed in mV per pH units. The theoretical electrode slope at
25°C is 59.16 mV/pH. When the electrode is new the slope is close to the theoretical value.
Sensitivity: It is the electrode's slope expression in relative terms. It is obtained by dividing the
actual value of the slope by the theoretical value, and is expressed as a %. The asymmetry
potential and the slope vary in time with the use of the electrode, which necessitates regular
calibration.
The pH electrodes must be calibrated using the standard solutions (see the calibration chapter
below). The ORP and specific ion electrodes do not need calibration. The standard redox
solutions are only used to check the quality of a redox electrode.
User calibration of the temperature sensor is not required: The sensor is calibrated in the
factory and the Callendar Van Dusen parameters are recorded in the SICRAM module.
The probes are detected during turn on, and this cannot be performed when the instrument
is already on, therefore if a probe is connected and the instrument is on, it is necessary to
turn it off and on.
Automatic or manual temperature compensation for pH measurement
The pH measurement is influenced by the measured solution temperature.
The electrode slope varies according to the temperature in a known mode according to Nernst law:
e.g., a 1pH variation, that at 25°C means 59.16mV, at 100°C means 74.04mV.
6pH 7pH
pH
8pH
74.04mV
-74.04mV
59.16mV
-59.16mV
54.20mV
-54.20mV
0mV
mV
T=100°C, 74.04mV/pH
T=25°C, 59.16mV/pH
T=0°C, 54.20mV/pH
When a temperature probe is present (temperature only probe, combined pH/temperature probe,
conductivity/temperature probe, or dissolved Oxygen/temperature probe), the instrument
automatically applies the ATC (Automatic Temperature Compensation) function.
In absence of the temperature probe or sensor, the lower display shows the MTC (Manual
Compensation Temperature).
If the correct value is not entered manually, the extent of the error committed in pH measurement
is proportional to temperature and measured liquid pH value itself. This occurs, for example with