Delta OHM HD3409.2 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 correction without prior notice.
REV. 1.2
22/10/2013
HD3409.2
ENGLISH

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2
Dissolved Oxygen – Temperature
HD3409.2

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3
HD3409.2
1. Connectors
2. Battery symbol: displays the battery charge level. It does not appear when the external power
supply is connected.
3. CAL key: it starts the dissolved Oxygen probe calibration.
4. REL key: enables the relative measurement (displays the difference between the current value
and the logged value when the key is pressed).
5. LOG/DUMP LOG key: during normal operation, starts and ends the saving of the data in the
internal memory; in the menu, starts the data transfer from the instrument's memory to the PC.
6. mg/l-%-ESC key: cyclically changes the main variable measurement between:
•dissolved Oxygen concentration (in mg/l),
•saturation index (in %),
•barometric pressure (in mbar).
7. SERIAL/ERASE LOG key: starts and ends the data transfer to the serial/USB communication
port. In the menu, clears the data contained in the instrument's memory.
8. °C/°F key: when the probe is not connected, allows manual modification of the temperature.
When a probe with temperature sensor is connected, pressing this key twice changes the unit of
measurement from degrees Celsius to Fahrenheit.
9. Function indicators.
10. key: in the menu, increases the current value.
11. Line for symbols and comments.
12. Main display line.
13. ON-OFF key: turns the instrument on and off; when pressed together with the CAL key, dis-
ables the automatic turn off.
14. MENU key: allows access to and exit from the menu.
15. ENTER key: in the menu, confirms the current selection; when pressed together with the
ON/OFF key, disables the automatic turn off. In the menu, increases the current value.
16. ESC key: in the menu, cancels the operation in progress without making changes.
17. FUNC key: during normal operation displays the maximum (MAX), the minimum (MIN) and
the average (AVG) of current measurements; in the menu, confirms the current selection. This
updates the display measurement when the Auto-Hold function is enabled.
18. MAX, MIN and AVG symbols.
19. key: in the menu, decreases the current value.
20. Secondary display line.
21. External mains power supply connector input 12Vdc for ∅5.5mm - 2.1mm connector.
22. Not used.
23. 8-pole DIN45326 connector, input for dissolved Oxygen and temperature combined probes, for
Pt100 SICRAM temperature probes and direct 4-wire Pt100 probes with TP47 module.
24. 8-pole MiniDin connector for RS232C connection using cable HD2110CSNM, for USB 2.0
connection using cable HD2101/USB, and for HD40.1 printer connection using cable
HD2110CSNM.

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4
INTRODUCTION
The HD34… family is composed of four desktop instruments for electrochemical measurements:
pH, conductivity, dissolved Oxygen and temperature.
The HD3409.2 measures the concentration (in mg/l) of dissolved Oxygen in liquids, the saturation
index (in %) and the temperature using SICRAM combined probes of polarographic, with two or
three electrodes, and galvanic type with integrated temperature sensor. Temperature only is meas-
ured by Pt100 SICRAM or direct 4-wire immersion, penetration or contact probes.
Thanks to an internal pressure sensor, the instruments automatically compensate for barometric
pressure. The instrument anticipates automatic compensation of the Oxygen probe membrane per-
meability and of the salinity of the liquid being examined.
The dissolved Oxygen probe's quick calibration function guarantees timely correctness of the per-
formed measurements.
The displayed data can be stored (datalogger) and can be transferred to PC or serial printer thanks
to the multi-standard serial ports RS232C and USB2.0 and software DeltaLog9 (Vers.2.0 or later).
The storing and printing parameters can be set from menu.
Display, printing and logging always show temperature in °C or °F, and one of the parameters of
oxygen measure (mg/l O2, %O2, mbar).
Other common functions of this instrument series include: Max, Min and Avg function, the Auto-
HOLD function, the automatic turning off which can also be disabled.
The instruments have IP66 protection degree.

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5
KEYBOARD AND MENU DESCRIPTION
Foreword
The instrument keyboard is composed of single-function keys, like the MENU key, and double-
function keys such as the LOG/DUMP LOG key.
In the double-keys, the function in the upper part is the "main function", while the one in the bottom
part is the "secondary function". When the instrument is in standard measurement mode, the main
function is active. In the menu or in conjunction with the FUNC key, the secondary function is en-
abled.
The pressing of a key is accompanied by a short confirmation beep: a longer beep sounds if the
wrong key is pressed.
Each key specific function is described in detail below.
ON-OFF key
The instrument is turned on and off using the ON/OFF key. The turning on enables all display seg-
ments for a few seconds. An auto-test follows which analyses the type of probe connected, and
reads its calibration information. In cases of a dissolved Oxygen probe, the electrode calibration co-
efficient (SLOPE) is also displayed: this value must be between 0.500 and 1.500. A value close to
1.500 indicates an exhausted probe (see page 12 for how to proceed). Finally, the instrument is set
for normal measurement.
If a temperature probe is connected, the main line displays a dotted line (- - - -).
The connected probe's data are captured upon turning the instrument on: when the
probe is inserted into a functioning instrument, the "NEW_PROB_DET" message ap-
pears: turn the instrument off and then back on again.
Replace the probes when the instrument is off.
+
Automatic turning off
The instrument has an AutoPowerOff function that automatically turns the instrument off after about
8 minutes if no key is pressed during the intervening time. The AutoPowerOff function can be dis-
abled by holding the ENTER/key pressed down when turning the instrument on: the battery
symbol will blink to remind the user that the instrument can only be turned off by pressing the
<ON/OFF> key.

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6
The automatic turning off function is disabled when external power is used. On the other
hand, it cannot be disabled when the batteries are discharged.
ENTER key
In the menu, the ENTER key confirms the current parameter and then goes to the next one. Pressed
together with the ON/OFF key, disables the automatic turn off.
MENU key
The first menu item is accessed by initially pressing on the MENU key; press ENTER to go to the
following items. To modify the item displayed, use the arrow keys (and ). The current value is
confirmed by pressing the ENTER key and the display moves on to the next parameter. If pressing
ESC the setting is cancelled.
To exit the menu, press the MENU key at any time.
The menu items are listed in this order:
1) Sample ID (Identifier of the sample being measured): it is an automatically increased
progressive number associated with the single PRINT function (print interval set to 0) for
the printing of labels. The index appears in the single sample printing together with date,
time, dissolved Oxygen and temperature measured values. This menu item allows the value
of the first sample to be set: each time the PRINT key is pressed, the identification ID in the
printing is increased by 1 allowing progressive measurement of all measured samples. If the
Auto-Hold function, described below in this chapter, is enabled, the print time interval is
forced to zero. Pressing SERIAL only causes the print to occur when the measurement has
stabilized (HOLD symbol still). Later, it is possible to repeat the print at will, but while the
HOLD mode is on, the sample identifier number is not increased. This is useful when more
labels must be printed with the same identification code without increasing the code each
time.
The message "SMPL ID UNT=RSET SER=PRNT" is scrolled in the comment line: using
the arrows (and ) the currently measured sample identifier value can be changed.
By holding the °C/°F key down the proposed number is set to zero.
The instrument's heading information will be printed using the SERIAL key.
2) AUTO-HOLD function: the instrument normally operates in continuous view mode (de-
fault setting). In this mode the displayed measurement is updated every second. If the Auto-
Hold function is enabled, the instrument performs the measurement and when it stabilizes it
goes in HOLD mode. To update the display indication, press FUNC.
In the following figure you can see an example of the measurement process with the Auto-
Hold function enabled. A probe is immersed into a liquid at concentration C1and, to per-
form the measurement, the FUNC key is pressed: The concentration measurement raises
progressively reaching the final value. The HOLD symbol blinks. In the stretch indicated by
1, the measurement remains stable for 10 seconds, within two digits: at the end of this inter-
val (point 2), the instrument goes into HOLD mode, presenting the final stable value.

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7
2 digit
10s
t
Ο
2
C
1
3) SAL mg/l (Setting the salinity): the message "SAL mg/l – UNT=RSET" is scrolled in the
comment line. The display central line shows the current salinity value, and the secondary
line the corresponding dissolved Oxygen concentration value. Use the arrows to enter this
value, and confirm using ENTER. To disable the salinity compensation, set the value to
zero: pressing the °C/°F key rapidly sets the value to zero without the need to use the ar-
rows.
Note: the dissolved Oxygen concentration depends on the measured liquid salinity. In con-
trast, salinity has no effect on the saturation index.
4) Management of memorized data: the message "LOG_DUMP_or_ERAS" (Transfer data
or erase) is scrolled in the comment line. The center figure reports the number of free mem-
ory pages (FREE). All memory data are permanently erased by pressing SE-
RIAL/EraseLOG. By pressing LOG/DumpLOG, the data transfer of the logged data on the
serial port is started: the "BAUD-RATE" must have previously been set to the maximum
value (please see the menu items described below and the paragraph "STORING AND
TRANSFERRING DATA TO A PERSONAL COMPUTER" on page 25).
5) Sleep_Mode_LOG (Automatic turning off during recording): this function controls the
instrument's automatic turning off during logging, occurring between the capture of a sample
and the next one. When the interval is lower than 60 seconds, the instrument will always
remain on. With intervals greater than or equal to 60 seconds, it is possible to turn off the in-
strument between loggings: it will turn on at the moment of sampling and will turn off im-
mediately afterwards, thus increasing the battery life. Using the arrows select YES and con-
firm using ENTER in order to enable the automatic turning off, select NO and confirm to
disable it and keep the instrument on continuously.
Note: even if Sleep_Mode_LOG=YES is selected, the instrument does not turn off for less
than one minute intervals.
6) Print and log interval: sets the interval in seconds between two loggings or data transfers
to the serial port. The interval can be set at 0s, 1s, 5s, 10s, 15s, 30s, 60s (1min), 120s (2min),
300s (5min), 600s (10min), 900s (15min), 1200s (20min), 1800s (30min) and 3600s (1
hour). If the value 0 is set, SERIAL works on command: the sending of data to the se-
rial port is performed each time the key is pressed. Recording (LOG) is performed with
one second intervals even if the interval is set to 0. With an interval from 1 to 3600s, con-
tinuous data transfer is started when the SERIAL key is pressed. To end the recording
(LOG) and continuous data transfer operations (SERIAL with an interval greater than 0),
press the same key again.
7) RCD MODE (Record mode): the instrument captures the dissolved Oxygen concentration,
saturation index, barometric pressure and temperature values every second. The relationship
existing between these parameters is such that the maximum or minimum value of one gen-
erally does not correspond to the maximum or minimum value of the others. If the RCD
MODE parameter is set to "I Sat", the maximum (MAX) and minimum (MIN) values dis-

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8
played using FUNC refer to saturation: the remaining indicated parameters are those meas-
ured at the maximum and minimum saturation index and not their maximum and minimum
values.
The same is true for the other items: "Conc" refers to dissolved Oxygen concentration, "tp"
to temperature, "Press" to barometric pressure.
If the RCD MODE parameter is set to "tp", the maximum and minimum values displayed
using FUNC refer to temperature: the other indicated parameters are those measured at the
maximum and minimum temperature and are not the maximum and minimum of the other
variables.
If "Indep" (=independent) is selected, the maximum and minimum values displayed using
FUNC/ENTER are independent: the indicated values are the maximum and minimum of
each variable but are not necessarily referred to the same measurement moment.
8) YEAR: to set the current year. Use the arrows to modify this parameter and confirm using
ENTER.
9) MNTH (month): to set the current month. Use the arrows to modify this parameter and con-
firm using ENTER.
10) DAY to set the current day. Use the arrows to modify this parameter and confirm using EN-
TER.
11) HOUR to set the current hour. Use the arrows to modify this parameter and confirm using
ENTER.
12) MIN to set the current minutes. In order to correctly synchronize the minute, it is possible to
reset the seconds by pressing the °C/°F key. Use the arrows to set the current minute plus
one, and as soon as that minute is reached press °C/°F: this synchronizes the time to the
second. Press ENTER to go onto the next item.
13) BAUD_RATE indicates the frequency used for the serial communication with the PC. Val-
ues from 1200 to 38400 baud. Use the arrows to modify this parameter and confirm using
ENTER. The communication between instrument and PC (or serial port printer) only
works if the instrument and PC baud rates are the same. If the USB connection is used
this parameter value is automatically set (please see the details on page 25).
FUNC key
It enables the display and logging of the maximum (MAX), minimum (MIN) and average (AVG)
value of dissolved Oxygen concentration, saturation index, barometric pressure and temperature
measurements, updating them with the acquisition of new samples. The acquisition frequency is
once a second. To switch from dissolved Oxygen to barometric pressure and to saturation index use
the mg/l-% key.
The MAX, MIN and AVG measurements remain in the memory until the instrument is on, even
after exiting the calculation function. To reset the previous values and restart with a new meas-
urement session, press FUNC until the message "FUNC CLR" appears, then use the arrows to
select YES and confirm using ENTER.
The dissolved Oxygen concentration (or barometric pressure or saturation index) and tem-
perature values are displayed at the same time. According to settings in the "RCD Mode"

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9
menu item, the maximum, minimum and average indications have different meanings: please
see the description of this MENU key below.
Attention: the data captured using the Record function cannot be transferred to the PC.
ESC key
In the menu, the key clears or cancels the active function (ESC).
CAL key
It starts the dissolved Oxygen probe calibration (please see the chapter dedicated to calibration on
page 13).
REL key
In measurement mode, it displays the difference between the current value and that measured on
pressing the key. The REL message appears on the display; press the key again to return to the cur-
rent measurement.
mg/l - % key
It changes the main variable measurement between dissolved Oxygen concentration (in mg/l), baro-
metric pressure (in mbar), and saturation index (in %).
The selected parameter is used for display, printing and logging.
The instrument has an Auto-Hold function, which can be set in the MENU, that "freezes" the meas-
urement automatically when it has been stable (within 1 digit) for over 10 seconds: the message
HOLD is displayed.
To perform a new measurement, it is necessary to press the FUNC key.
The HOLD message starts blinking, while the display follows the actual measurement trend, until it
stabilizes again and the HOLD message remains still.
LOG/DumpLOG key
In measurement mode, this function 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 "Print and log interval"
menu parameter. The data logged between a start and subsequent stop represent a single session.

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10
When the logging function is on, the LOG indication is displayed, the battery symbol blinks and a
beep is issued each time a logging occurs; the battery symbol does not appear when using an
external power supply.
To end the logging, press LOG.
If the Auto-HOLD function is enabled (please see the menu), the data logging is disabled.
The HD3409.2 can turn off during logging between one capture and the next: the function is
controlled by the Sleep_Mode_LOG parameter. When the logging interval is less than one minute,
the logging instrument remains on; with an interval of at least one minute, it turns off between one
capture and the next if the parameter Sleep_Mode_LOG=YES.
>>> Dump LOG
To start the transfer of the data contained in the instrument internal memory via the serial port, press
the MENU key. Using FUNC/ENTER select the "LOG_DUMP_or_ERAS" item, and then press on
the LOG/DUMP LOG key.
Please see the paragraph dedicated to data transfer on page 25.
SERIAL/EraseLOG key
In measurement mode, this function starts and stops the data transfer to the RS232C serial output.
According to the settings entered in the Print and log interval menu item, a single sample can be
printed if Print and log interval=0 or a continuous indefinite printing of the measured data can be
set up if Print and log interval=1…3600.
The printing operation is accompanied by the display of the RS232 symbol and the blinking of the
battery symbol; when using an external power supply the battery symbol does not appear.
Press SERIAL to end the continuous printing.
Before starting the printing with SERIAL, set the baud rate. To do so, select the Baud Rate menu
item and select the maximum value equal to 38400 baud by using the arrows. Confirm by pressing
ENTER.
The DeltaLog9 software for PC will automatically set the baud rate value during connection. If you
are using a different program than DeltaLog9, be sure the baud rate is the same for both the
instrument and the PC: the communication will only work in this way.
>>>
Erase memory
Press the MENU key to permanently clear all the data contained in the instrument's memory. Us-
ing FUNC/ENTER select the "LOG_DUMP_or_ERAS" item, and then press on the SERIAL key.

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°C/°F key
The temperature value measured by the sensor present in the dissolved Oxygen probe is used to cal-
culate the saturation index and the dissolved Oxygen concentration in the liquid being measured.
The key changes the unit of measurement between Centigrade or Fahrenheit.
If the probe is not present, the compensation temperature must be entered manually: to manually
change the value shown in the display lower line, press °C/°F once. The temperature indicated starts
blinking. While the display is blinking, it is possible to change the compensation temperature using
the arrows (and ). Confirm using ENTER. The display stops blinking, and the temperature
displayed is used for compensation.
If the temperature probe is not present, to change the unit of measurement between °C and °F, it is
necessary to press twice the °C/°F key.
Up Arrow
When used in the menu, it increases the current variable value. During measurement, if the tempera-
ture probe is not present, it increases its value.
Down Arrow
When used in the menu, it decreases the current variable value. During measurement, if the tem-
perature probe is not present, it decreases its value.

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MEASUREMENT OF THE DISSOLVED OXYGEN
The instruments work with combined probes of polarographic, with two or three electrodes, and
galvanic type with integrated temperature sensor, or with temperature probes with Pt100 sensor.
The dissolved Oxygen probe is fitted with SICRAM module; the temperature probe can be a SI-
CRAM type or direct 4 wires with TP47 module.
The probe measures the dissolved Oxygen partial pressure in the measured liquid, as well as the
temperature and the barometric pressure. Using these values, it calculates the dissolved Oxygen
concentration in mg/l, and the saturation index (in %).
The temperature indication is displayed in the secondary line; the main line shows all the other
quantities.
The probe is 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.
How to measure
Some instruction on the instrument's operation procedures are reported below.
To measure the dissolved Oxygen, immerse the probe in the liquid to a depth of at least 40 mm.
It is essential that the liquid in front of the membrane is continually changed so as to avoid incorrect
measurements caused by Oxygen exhaustion in the liquid in contact with the membrane. Check that
the liquid stirring is such that it avoids production of measurement variations.
While immersing the probe, check that no air bubbles remain trapped in contact with the membrane.
When connecting the probe to the instrument, wait a few minutes until the reading is stable and reli-
able. This time span serves to eliminate the dissolved Oxygen in the probe's internal electrolyte.
The probe connected to the instrument is always aligned even if the instrument is off: in this condi-
tion the measurement can occur immediately after turning on, once the probe response stabilized.
Attention: when no measurement is taken for long periods, it is recommended that the probe
be disconnected from the instrument to avoid useless consumption of the probe internal elec-
trolyte. In the galvanic probe, withdraw the probe internal electrolyte using the syringe, to
avoid useless consumption of the measurement electrodes.
If the measurements are taken in a container, perform them with the container filled until running
over. Fit the container with a stirrer and adjust the stirring speed in order to obtain a stable reading
until an equilibrium is reached, avoiding trapping air in the liquid.
While measuring running water, for example, water streams, check that the flow speed is sufficient,
otherwise remove the probe, pick up a sample and proceed as described above.
The temperature measuring range with the oxygen probe is 0°C to +45°C.

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13
Measurement of the concentration of dissolved Oxygen
The probe must be calibrated periodically using the DO9709/20 (for polarographic probe) or
DO9709/21 (for galvanic probe) calibrator.
The instrument checks the dissolved Oxygen probe efficiency; the "CHNG MEMBRANE AND
ELECTROLYTE" message indicates that the probe is exhausted.
The same message is displayed during calibration: either when calibration is not possible or the
reading is unstable. It is thus necessary to replace the probe or clean the measurement cell with re-
placement of the electrolyte and/or the membrane covering the measurement electrodes.
Proceed as follows:
1. Connect the probe to the instrument.
2. Turn the instrument on with the ON/OFF key.
3. Wet the sponge contained in the calibrator using 2ml of distilled water.
4. Insert the probe into the calibrator.
5. Wait a few minutes until the system stabilizes thermally and 100%RH is reached inside the
calibrator.
6. Using "mg/l-%", select the measurement of dissolved Oxygen concentration (SAT%).
7. Press CAL to start the calibration: press ENTER to confirm and exit the procedure, or ESC
to quit the calibration without making changes.
8. On pressing ENTER, the display shows the new gain value (SLOP) for a few seconds and then
will progressively reach 101.7%.
The instrument is calibrated and ready for use.
On pressing ENTER during calibration, the instrument checks that the correction to be made does
not exceed the expected limits for correct functioning. Slope between 0.500 and 1.500. If the cali-
bration is rejected because it is outside the admitted corrections, the CAL ERR message will ap-
pear, followed by the "CHNG MEMBRANE AND ELECTROLYTE" message. The instrument
maintains the previous calibration values until the probe's efficiency is restored.
Electrolyte solution and/or membrane replacement
The electrolyte contained in the dissolved Oxygen probe will be exhausted because of the chemical
reaction generated by the current in proportion to the partial pressure of the Oxygen present in the
water. Subsequently, the current generated by the probe is so low that the calibration operation is
impossible. It is necessary to replace the electrolyte contained in the probe to restore its functionality.
Incorrect use of the probe can cause the rupture or obstruction of the Oxygen-permeable membrane con-
taining the electrolyte solution. In this case it is necessary to replace the membrane and the electrolyte
solution.

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14
POLAROGRAPHIC PROBE
Unscrew the probe's head and the membrane
permeable to oxygen.
If necessary, replace the membrane.
Fill the probe's head with the DO 9701 electrolyte
solution until the level indicated in the figure
(filling level).
Eliminate any possible air bubble in the electrolyte
solution.
Screw the probe's head back on carefully.
GALVANIC PROBE
1. Unscrew the probe's head and the membrane permeable to oxygen. If necessary, replace the
membrane.
2. Attach the needle to a 10 ml syringe.
3. Using the syringe, withdraw the DO 9701.1 electrolyte solution.
4. Remove the air bubbles inside the syringe. Insert the needle into one of the
four holes surrounding the cathode of the probe and inject the solution until it
leaks out. The fill volume is approximately 5 ml.
5. Screw the probe's head back on carefully.
After replacement of the electrolyte solution and/or membrane, insert the probe's connector in the
instrument and wait 15 minutes before performing the dissolved oxygen measurement (this is the
necessary time to exhaust the oxygen trapped in the electrolyte solution during the replacement).

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15
Check the probe's status
The glass body covering the cathode of the polarographic probe and the membrane on the probe's
head should not be damaged.
If there are cracks in the glass body, the probe must be replaced. If the Oxygen-permeable mem-
brane is damaged, dirty or obstructed it must be replaced. When the probe's head is unscrewed the
probe is not protected. Handle it with care to avoid collisions that could damage it irreparably.
Control the zero of the probe
Compensation of the zero (offset) of the probe is already done in the factory.
The user can control the offset by immersing the probe in the 0.0% dissolved Oxygen solution (DO
9700):
•pour a small quantity of 0.0% dissolved Oxygen solution into a container, after suitably
cleaning the container with distilled water,
•insert the probe in the zero solution and wait at least 5 minutes,
•the instrument should indicate a saturation index < 0.3%.
Dissolved Oxygen probe storage
When the dissolved Oxygen probe is not used it should be disconnected from the instrument to
avoid useless consumption of the electrolyte solution and the discharge of the batteries.
When no measurement is taken for long periods, withdraw the internal electrolyte of the galvanic
probe using the syringe, to avoid useless consumption of the measurement electrodes.
Always keep the electrode wet using the special cap provided with the probe and filled with dis-
tilled water.
Polarographic probe and galvanic probe: differences
To help choosing between the use of polarographic or galvanic probe, the following table summa-
rizes the main differences between the two probes.
Polarographic probe Galvanic probe
Polarization time After connecting the probe to the
instrument it is necessary to wait
at least 5-10 minutes before taking
the measurement.
Polarization is not needed. After
connecting the probe to the in-
strument it is possible to take the
measurement immediately.
Power consumption If connected to the instrument, the
probe is also powered when the
instrument is off, decreasing the
life of the batteries.
Power is not needed. Longer life
of the batteries, feature important
in field measurements.
Cleaning Requires frequent cleaning of the
anode.
Maintenance of the electrodes is
not needed.
Electrolyte replacement Requires frequent replacement of
the electrolyte solution.
It can also work months without
replacing the electrolyte solution.
Drift The measurement of the zero has
the tendency to drift.
The measurement of the zero is
stable. Higher accuracy when me-
asuring low oxygen concentrations.

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16
Pt100 TEMPERATURE PROBES
The instrument accepts the input of Platinum temperature probes with resistances of 100Ωwith SI-
CRAM module or direct 4 wires with TP47 module.
The excitation current was chosen in order to minimize the sensor self-heating effects.
The probes with direct 4 wire input are checked for conformity with class A tolerance accord-
ing to norm IEC751 - BS1904 - DIN43760.
The °C or °F unit of measurement can be chosen for display, printing, and logging using the °C/°F
key °C/°F.
How to measure
The temperature measurement by immersion is carried out by inserting the probe in the liquid for at
least 60mm; the sensor is housed in the end part of the probe.
In the temperature measurement by penetration the probe tip must be inserted to a depth of at least
60mm, the sensor is housed in the end part of the probe. When measuring the temperature on frozen
blocks, it is convenient to use a mechanical tool to bore a cavity in which to insert the tip probe.
In order to perform a correct contact measurement, the measurement surface must be even and
smooth, and the probe must be perpendicular to the measurement plane.
So as to obtain the correct measurement, the insertion of a drop of oil or heat-conductive
paste is useful (do not use water or solvents). This method also improves the response time.
Instructions to connect the TP47 module for 4-wire Pt100 probes
All Delta Ohm probes are provided with a TP47 module. The HD3409.2 also work with direct
4-wire Pt100 probes manufactured by other producers: for the instrument connection is prescribed
the TP47 connector to which the probe's wires should be welded.
The instructions to connect the Platinum probe to the TP47 module are provided below.
The module is supplied complete with fairlead and gasket for 5mm maximum diameter cables.
Do the following to open the module and connect a probe:
Unscrew the fairlead and extract the gasket, remove the label using a cutter, unscrew the ring on the
opposite side as illustrated in the figure:

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17
Open the two module shells: the printed circuit to which the probe must be connected is housed in-
side. On the left there are the 1…4 points on which the sensor wires must be welded. The JP1…JP4
jumpers are in the center of the card. These must be left open:
1
2
3
4
Pt100 3 wires
Pt1000
Ni1000
Not Used
Before welding, pass the probe cable through the fairlead and gasket.
Weld the wires as shown in the table:
Sensor Card connection Jumper to close
Pt100 4 wires
4JP4
3JP3
1JP1
2JP2
Pt100
4 wires
None
Ensure the welds are clean and perfect. Once the welding operation is complete, close the two
shells, insert the gasket in the module, screw the fairlead. At the other end of the module, enter the
ring with the O-Ring as indicated in the picture.
Make sure the cable is not twisted while you are screwing the fairlead. Now the probe is ready.
Direct connection of the 4-sensor to a DIN45326 connector
4-wire Pt100 sensor can be welded
directly to the DIN45326 female con-
nector’s pins without having to resort
to the TP47 board. The 4 wires of
Pt100 must be soldered as shown in
the diagram to the left.
Probe Pt100 is acknowledged by the
device upon start-up: insert the probe
when the device is off, and only start
up after insertion. No further setting is
needed to use these probes. This con-
nector does not guarantee the IP66
protection degree.
Sensor Direct connection to the connector
Pt100 4 wires
Female connector on the welding

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18
WARNINGS AND OPERATING INSTRUCTIONS
1. The dissolved Oxygen probes can be influenced by the presence of gases and vapours, such as
chlorine, sulphur dioxide, hydrogen sulphide, amines, ammonia, carbon dioxide, bromine and
iodine. Such substances can get through the membrane and interfere with the measurement.
Other substances such as solvents, oils, sulphurs, carbonates and algae can obstruct or degrade
the membrane or corrode the electrodes.
2. Never touch the active membrane surface of the dissolved Oxygen probe.
3. Do not expose the probes to gases or liquids that could corrode the material of the sensor or the
probe itself. Clean the probe carefully after each measurement.
4. Do not bend the probe connectors or force them upward or downward.
5. Do not bend or force the contacts when inserting the probe connector into the instrument.
6. Do not bend, deform or drop the probes, as this could cause irreparable damage.
7. Always select the most suitable probe for your application.
8. Do not use probes in presence of corrosive gases or liquids. The sensor container is made of
AISI 316 stainless steel, while the contact probe container is made from AISI 316 stainless steel
plus silver. Avoid contact between the probe surface and any sticky surface or substance that
could corrode or damage it.
9. Above 400°C and below –40°C, avoid violent blows or thermal shocks to Platinum temperature
probes as this could cause irreparable damage.
10. To obtain reliable measurements, temperature variations that are too rapid must be avoided.
11. Temperature probes for surface measurements (contact probes) must be held perpendicular
against the surface. Apply oil or heat-conductive paste between the surface and the probe in or-
der to improve contact and reduce reading time. Whatever you do, do not use water or solvent
for this purpose. A contact measurement is always very hard to perform. It has high levels of
uncertainty and depends on the ability of the operator.
12. Temperature measurements on non-metal surfaces usually require a great deal of time due to the
low heat conductivity of non-metal materials.
13. Probes are not insulated from their external casing; be very careful not to come into contact with
live parts (above 48V). This could be extremely dangerous for the instrument as well as
for the operator, who could be electrocuted.
14. Avoid taking measurements in presence of high frequency sources, microwave ovens or large
magnetic fields; results may not be very reliable.
15. Clean the probe carefully after use.
16. The instrument is water resistant and IP66, but is not watertight and therefore should not be
immersed in water without closing the free connectors using caps. The probe connectors must
be fitted with sealing gaskets. Should the instrument fall into the water, check for any water in-
filtration. Gently handle the instrument in such a way as to prevent any water infiltration from
the connectors' side.

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19
INSTRUMENT SIGNALS AND FAULTS
The following table lists all error indications and information displayed by the instrument and sup-
plied to the user in different operating situations.
Display indications Explanation
ERR It appears when the dissolved oxygen or temperature measurements ex-
ceed the expected ranges.
CAL
ERR
This appears during calibration when the gain correction exceeds the lim-
its of 0.500 or 1.500. If this occurs, the calibration is rejected and the
previous values are maintained.
LOG
MEM
FULL
Memory full; the instrument cannot store further data, the memory space
is full.
SYS
ERR
#
Instrument management program error. Contact the instrument's supplier
and communicate the numeric code # reported by the display.
CAL
LOST
Program error: it appears after turning on for a few seconds. Contact the
instrument's supplier.
BATT TOO LOW
CHNG NOW
Indication of insufficient battery charge appearing on turning on. The in-
strument issues a long beep and turns off. Replace the batteries.

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20
The following table reports the indications provided by the instrument as they appear on the display,
together with their description.
Display indication Explanation
AUTO HOLD automatic function holding the displayed measurement
BATT TOO LOW - CHNG NOW battery discharged - replace it immediately
BAUDRATE baud rate value
CHNG MEMBRANE AND ELECTROLYTE replace the electrolyte solution and/or membrane
COMM STOP printing complete
COMM STRT printing started
DAY_ day
DUMP_END data transfer complete
DUMP_IN_PROG data transfer in progress
FUNC CLR max, min and average values clearing
FUNC CLRD max, min and average values cleared
HOUR hour
LAST CAL m/d h/m last calibration date month/day hour/minutes
LOG IN PROG logging in progress
LOG MEM FULL memory full
LOG_CLRD memory data cleared
LOG_DUMP_OR_ERAS transfer or erase data
LOG_STOP logging complete
LOG_STRT logging started
mg/l concentration of dissolved Oxygen unit of measurement
MIN >>> USE_UNIT_TO_ZERO SEC minutes >>> use the UNIT key to reset the seconds
MNTH month
NaCl measurement of salinity in g/l
PLS_EXIT >>> FUNC RES_FOR_FACT ONLY please exit using ESC >>> function reserved to factory calibra-
tion
PRBE_TYPE type of probe connected
PRNT AND LOG INTV printing and logging intervals
PRNT INTV printing interval
PROB COMM LOST lost communication with probe
RCD MODE record function operating mode (max, min, avg)
REF_TEMP reference temperature
SAL mg/l UNT=RSET setting the salinity (°C/°F key to reset)
SAT % the display is showing the saturation index
SLOP slope or gain of the dissolved Oxygen probe
SLP_MODE_LOG turning off during recording mode
SMPL ID UNT=RSET SER=PRINT identifier of the sample - °C/°F=reset - SERIAL=print heading
SYS ERR # program error number #
UNDR minimum limit exceeded
YEAR year