Martini Instruments MI 306 User manual

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EC/TDS MeterEC/TDS Meter
EC/TDS MeterEC/TDS Meter
EC/TDS Meter
Mi 306
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ogging EC/TDS Meter
INSTRUCTION MANUAL

Instruction Manual Mi 306 EC/TDS Meter
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FUNCTIONAL DESCRIPTION .................................................................................... 2
GENERAL DESCRIPTION ........................................................................................... 4
PROBE MAINTENANCE ............................................................................................ 5
SPECIFICATION ....................................................................................................... 5
SETUP ...................................................................................................................... 7
TAKING MEASUREMENTS ......................................................................................... 9
AUTORANGING .................................................................................................... 10
AUTO ENDPOINT MODE ....................................................................................... 10
TEMPERATURE COMPENSATION ............................................................................ 11
EC/TDS CALIBRATION ............................................................................................ 12
NACL CALIBRATION ............................................................................................... 13
LOGGING FUNCTION .......................................................................................... 14
DATA TRANSFER TO PC .......................................................................................... 17
BATTERY REPLACEMENT ......................................................................................... 18
CONDUCTIVITY VS TEMPERATURE CHART .............................................................. 18
ACCESSORIES ........................................................................................................ 19
DISPLAYDISPLAY
DISPLAYDISPLAY
DISPLAY
A. PRIMARY DISPLAY
B. AUTO ENDPOINT MODE
INDICATOR
C. LOW BATTERY INDICATOR
D. CALIBRATION MODE INDICATOR
E. REQUIRE USER CONFIRMATION
F. CALIBRATION TAGS
G. MEASURING UNIT FOR PRIMARY
DISPLAY
H. PRIMARY DISPLAY MODE
I. MEASURING UNIT FOR
SECONDARY DISPLAY
J. SECONDARY DISPLAY
FUNCTIONAL DESCRIPTION
B
C
H
D
E
FJ
G
I
A

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FUNCTIONAL DESCRIPTION
1. Liquid Crystal Display (LCD)
2. ON/OFF key, to turn the meter on
and off
3. RANGE/FIXED key, to select mea-
surement range or (with SHIFT) to fix
the current range.
4. ▲/SETUP key, to move up or (with
SHIFT) to enter setup mode.
5. ATC/TC key, to select temperature
compensation mode or (with SHIFT)
to view the temperature coefficient
value.
6. MEM/MR key, to store or (with SHIFT)
recall measurements.
7. ▼/CFM key, to move down or (with
SHIFT) to confirm displayed choice.
8. SHIFT key, to enable inverse functions.
9. CAL/HOLD key, to enter calibration
mode or (with SHIFT) to enter Auto
Endpoint mode.
10. DIN connector for probe
11. RS232 plug

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GENERAL DESCRIPTION
Thank you for choosing Martini Instruments. This instruction manual will provide you
the necessary information for correct use of the meter.
Mi 306Mi 306
Mi 306Mi 306
Mi 306 is a waterproof portable logging microprocessor-based Conductivity/TDS/
NaCl/temperature meter.
The autoranging feature of the EC and TDS ranges automatically sets the meter to the
scale with the highest possible resolution.
The Auto Endpoint (HOLD) feature automatically freezes the display when a stable
reading is reached.
The measurements are automatically (ATC) or manually (MTC) compensated for
temperature. The temperature coefficient value is user selectable. It is possible to
disable the temperature compensation and measure the actual conductivity (NOTC).
The Battery Error Preventing System (BEPS) switches the meter off when the batteries
are too weak to support proper function.
The meter can store measurements in memory by logging function for retrieval at a
later time upon user request.
Mi 306Mi 306
Mi 306Mi 306
Mi 306 also allows data transfer to computer through the RS232 port.
This EC/TDS/NaCl/Temp Meter is supplied with:
• MA914D/1 EC/TDS/NaCl Temp Electrode
• MA9066 12880 μS/cm calibration olution, 230 mL
• MA9350 RS232 connection cable with 2 meters cable
• 12 VDC Adapter
• Instruction manual
This instrument is in compliance with the CE Directives.

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SPECIFICATIONS
Range EC 0.00 to 29.99 μS/cm
(Autoranging) 30.0 to 299.9 μS/cm
300 to 2999 μS/cm
3.00 to 29.99 mS/cm
30.0 to 200.0 mS/cm
Up to 500.0 mS/cm actual(*) Conductivity
TDS 0.00 to 14.99 mg/L
(Autoranging) 15.0 to 149.9 mg/L
150 to 1499 mg/L
1.50 to 14.99 g/L
15.0 to 100.0 g/L
Up to 400.0 g/L actual(*) TDS (with 0.80 factor)
NaCl 0.0 to 400.0 %
Temp. 0.0 to 60.0 °C
Resolution EC 0.01 μS/cm (from 0.00 to 29.99 μS/cm)
0.1 μS/cm (from 30.0 to 299.9 μS/cm)
1 μS/cm (from 300 to 2999 μS/cm)
0.01 mS/cm (from 3.00 to 29.99 mS/cm)
0.1 mS/cm (over 30.0 mS/cm)
TDS 0.01 mg/L (from 0.00 to 14.99 mg/L)
0.1 mg/L (from 15.0 to 149.9 mg/L)
1 mg/L (from 150 to 1499 mg/L)
0.01 g/L (from 1.50 to 14.99 g/L)
0.1 g/L (over 15.0 g/L)
NaCl 0.1 %
Temp. 0.1°C
PROBE MAINTENANCE
Rinse the probe with clean water after measurements. If a more thorough cleaning is
required, remove the probe sleeve and clean the probe with a cloth or a nonabrasive
detergent.
Make sure to reinsert the sleeve onto the probe properly and in the right direction.
After cleaning the probe, recalibrate the instrument.

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SPECIFICATIONS
Accuracy EC ±1% of reading (±0.05 μs/cm or 1 digit whichever
greater)
TDS ±1% of reading (±0.053 ppm or 1 digit whichever greater)
NaCl ±1% of reading
Temp. ±0.4°C
Typical EMC EC ±1% of reading
Deviation TDS ±1% of reading
NaCl ±1% of reading
Temp. ±0.1 °C
Logging 250 records, LOG on demand or auto-logging
Communication with PC - RS232
EC Calibration 1 point with 7 memorized buffers: 0, 84, 1413, 5000,
12880, 80000, 111800 μS/cm
NaCl Calibration 1 point with HI 7037 buffer (optional)
Temperature 2 points at 0 and 50°C
Calibration (plus ±1°C adjustment)
Temperature Automatic or Manual from 0 to 60°C
Compensation (can be disabled to measure actual conductivity)
Temperature 0.00 to 6.00 %/°C (for EC and TDS only)
Coefficient Default value is 1.90%/°C
Reference Temp. 20 or 25 °C
TDS Factor 0.40 to 0.80 (default value is 0.50)
Probe MA 814D/1 EC probe with built-in temperature sensor
& 1.1 m cable (included)
Auto Off After 5 minutes (can be disabled)
Power supply 9V Battery (included) - approx. 100 hours of use
Casing IP 67
Environment 0 to 50°C ; 100% RH
Dimensions 200 x 85 x 50 mm (7.9 x 3.3 x 2.0")
Weight 280 g (10 oz)

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SETUP
Setup is used to view or change the instrument parameters.
To enter setup press SHIFT+SETUP when the meter is in measure-
ment mode.
"Set" is displayed on the upper LCD. The lower LCD displays the blinking code of the
current setup item.
Select the desired setup item using the ▲or ▼key.
Press SHIFT+CFM to confirm.
Note:Note:
Note:Note:
Note: If SHIFT+SETUP are pressed before item confirmation, the meter will escape and
return to measurement mode.
Once the desired setup item has been selected, its current value blinks (if it is a
changeable parameter).

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ItemItem
ItemItem
Item DescriptionDescription
DescriptionDescription
Description DefaultDefault
DefaultDefault
Default Valid valueValid value
Valid valueValid value
Valid value
tc Temp. compensation coeff. 0.00 to 6.00 %/°C 1.90
tcE Temp. compensation mode Atc, Mtc, notc Atc
rEF Reference Temperature 20 or 25°C 25°C
tdS TDS factor 0.40 to 0.80 0.50
CEL Cell constant (K) 0.500 to 1.700 1.000
Aof Auto-Off enable On, OFF On
YEA Year 1999 to 2098 1999
dAT Date dd:mm 01:01
hou Hour hh:mm 00:00
uEr Firmware release
Chr Battery level test
To change the value use the ▲or ▼key.
Press SHIFT+CFM to confirm.
Note:Note:
Note:Note:
Note: Press SHIFT+SETUP before confirmation to escape without changing the previ-
ously set value.
The following table lists the setup items, their valid range of values and the factory
settings (default):
Notes:Notes:
Notes:Notes:
Notes:
1 Once enabled, the Auto Off time is fixed at 5 minutes.
2 When the battery level test is selected (Chr), LCD will display the remaining percent-
age of battery charge. 100% means fully charged battery and 0% corresponds to the
minimum battery level that allows the meter to operate.

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TAKING MEASUREMENTS
Press the ON/OFF key to turn the meter on.
At startup the display will show the reference temperature value with
"rEF" indication for a few seconds.
Immerse the probe into the solution to be tested. The sleeve holes
must be completely submerged. Tap the probe repeatedly to re-
move any air bubbles that may be trapped inside the sleeve.
If needed, press the RANGE key repeatedly until the desired range
(EC, TDS, NaCl) is selected on the LCD.
Allow for the reading to stabilize. The upper LCD displays the measure in the selected
range while the temperature is displayed on the lower LCD.
Notes:Notes:
Notes:Notes:
Notes:
1 If the meter displays "----", the reading is out of range.
2 If the reading is not stable, the stability indicator " " blinks.
The battery charge level calculation is based on a typical alkaline battery discharge
curve.
If the meter is connected to an external power adapter and "Chr" is selected, the LCD
will display "LINE".
3 At startup, the main LCD shows briefly the reference temperature, while the secondary
LCD shows "rEF".

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3 Make sure the meter is calibrated before taking measurements.
4 If measurements are taken successively in different samples, to have accurate readings it is
recommended to rinse the probe thoroughly with deionized water before immersion in the
samples.
5 To maximize battery life, the meter is automatically switched off after 5 minutes of non-use. To
reactivate the instrument press the ON/OFF key. This feature can be disabled by entering the
setup mode and selecting the "AoF" item (see SETUP section for details).
6 TDS reading is obtained multiplying the EC reading by the TDS factor, which has a default
value of 0.50. It is possible to change the TDS factor in the 0.40 to 0.80 range by entering
the setup mode and selecting the "tdS" item (see SETUP section). Always set the reference
temperature to 25°C when measuring TDS.
7 When the use of an alternate function (MR, SETUP, CFM, FIXED, TC and HOLD) is
requested, press and hold the SHIFT key first and then the second key.
AUTORANGING
The EC and TDS scales are autoranging. The meter automatically sets the scale with
the highest possible resolution.
By pressing SHIFT+FIXED, the autoranging feature is disabled and the
current range is frozen on the LCD. "FIXED" symbol blinks on the LCD.
To restore the autoranging option press SHIFT+FIXED again.
Note: Autoranging is automatically restored if the RANGE key is pressed, if the setup or
calibration modes are entered and if the meter is turned off and back on again.
AUTO ENDPOINT MODE
The Auto Endpoint feature allows the user to freeze the display, when a stable reading is
reached (EC/TDS/NaCl and temperature range).
To enter the Auto Endpoint mode, press SHIFT+HOLD keys.

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The LCD will show the current reading together with a blinking "H" tag.
When measurement becomes stable, the "H" symbol stops blinking and the measured
value is frozen on the display.
To exit this mode and return to normal operations, press again SHIFT+HOLD.
Note: While in Auto Endpoint mode, current measurement (both stable and unstable)
can be stored in the meter memory by pressing the MEM key.
Note: While in Auto Endpoint mode, calibration mode can not be entered and it is not
allowed to change the temperature compensation and the range options.
TEMPERATURE COMPENSATION
Three options of compensating temperature are available:
Automatic (Atc): The probe has a built-in temperature sensor; the value of the tempera-
ture is used to automatically compensate the EC/TDS reading. This is the default option.
Manual (Mtc): The temperature value, shown on the lower LCD, can be manually set by
the user with the up and down arrow keys. The "°C" symbol blinks when this option is
active.
No Compensation (notc): The temperature reading shown on the lower LCD is not
taken into account. The reading displayed on the upper LCD is the actual EC or TDS
value. The "%TC" symbol blinks when this option is active.
To select the desired option press the ATC key until the option is
briefly displayed on the LCD.

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If temperature compensation is active, measurements are compensated using a default
temperature coefficient of 1.90 %/°C.
It is possible to select a different temperature coefficient (TC) in the 0.00 to 6.00 %/°C
range by entering the setup mode and selecting the "tc" item (see SETUP section for
details).
The current temperature coefficient can be quickly viewed pressing
SHIFT+ATC. The value is briefly displayed on the lower LCD.
EC/TDS CALIBRATION
EC calibration is a single point procedure. Selectable calibration points are: 0.0, 84.0
μS/cm, 1413 μS/cm, 5.00 mS/cm, 12.88 mS/cm, 80.0 mS/cm,111.8 mS/cm.
To enter EC calibration select the EC range and press the CAL key.
Note: TDS reading is automatically derived from the EC reading and no specific
calibration for TDS is needed. Pressing CAL while TDS range is selected has no
effect.
Rinse the probe with some of the calibration solution or deionized water. Immerse the
probe into the solution. The sleeve holes must be completely submerged. Tap the probe
repeatedly to remove any air bubbles that may be trapped inside the sleeve.
Begin with Zero calibration, just leave the dry probe in air.
The indications "REF" and "CAL" are displayed. The upper LCD shows the uncalibrated
EC reading. The lower LCD shows the buffer value. The stability indicator " " blinks.
Select the desired value of buffer with the ▲and ▼keys, if
necessary.

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When the " " symbol stops blinking, the reading is stable. The "CFM" indication starts
blinking on the LCD asking for confirmation.
Press SHIFT+CFM to confirm the calibration.
If everything is satisfactory, the meter displays the "Stor Good"
message and returns to measurement mode.
Notes
I. The meter uses 1.90%/°C compensation factor during calibration. If the setup item
"tc" has been set to a different value, when exiting the calibration mode the value
displayed on the upper LCD could be different from the nominal buffer value.
II. It is possible to set the cell constant value directly without following the calibration
procedure. To set the cell constant enter the setup mode and select "CEL" (see SETUP
for details).
III. Press SHIFT+CFM to confirm. The meter returns to measurement mode.
NaCl CALIBRATION
Calibration is 1-point at 100.0% NaCl. Use the MA 9066MA 9066
MA 9066MA 9066
MA 9066 calibration solution (sea
water solution) as a 100% NaCl standard solution.
• To enter NaCl calibration select the NaCl from “RANGE” key and press CAL.
• Rinse the probe with some of the calibration solution or deionized water. Immerse the
probe into HI 7037 solution. The sleeve holes must be completely submerged. Tap the
probe repeatedly to remove any air bubbles that may be trapped inside the sleeve.
• The indications "STD" and "CAL" are displayed. The upper LCD shows the uncalibrated
NaCl reading in percentage. The lower LCD shows "100".
• When the " " symbol stops blinking, the reading is stable. The "CFM" indication
starts blinking on the LCD asking for confirmation.
• Press SHIFT+CFM to confirm the calibration.
• If everything is satisfactory, the meter displays the "Stor Good" message and returns to
measurement mode.
Note: If the uncalibrated reading is too far from the expected value, the calibration is
not recognized. The "CFM" indication does not appear; the " " and "STD"
symbols blink to signal wrong or contaminated calibration solution.

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LOGGING FUNCTION
To store the current reading in memory press the MEM key while in
measurement mode. The LCD will display "Stor" along with the
"SAMPLE" indication and the sample number for a few seconds.
By pressing the MEM key a complete set of information is memorized: date, time, EC/
TDS/NaCl and temperature readings.
Up to 250 samples can be stored into memory.
When the memory is full and the MEM key is pressed, the sample will not be stored and
the LCD will display "FULL". In this case it is necessary to delete some data from memory
to proceed.
To view logged dataTo view logged data
To view logged dataTo view logged data
To view logged data
To retrieve the memorized information press SHIFT+MR.
The meter displays the day and mounth (upper LCD) and the
number (lower LCD) of the last logged sample. The "ZERO" indica-
tion will be displayed if no samples are stored in memory.
• Select the desired sample number with the arrow keys. Pressing
the ▲key while the last sample is displayed causes the meter to
go to the first sample.

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• Press RANGE to view remaining data of the selected sample.
After the date information, the remaining data will be displayed
in the following order:
year hour
• It is always possible to skip to another sample using the up and down arrow keys.
For example, if the reading of a sample is displayed, pressing the up arrow key
will cause the meter to display the reading of the next sample.
• At any time it is possible to return to normal operational mode by pressing
SHIFT+MR.
- temperature reading
"----" means reading out of range.
- EC, TDS, NaCL reading
"----" means reading out of range
or no probe was connected.

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To delete logged dataTo delete logged data
To delete logged dataTo delete logged data
To delete logged data
It is possible to delete a single sample or all the memory at one time.
To delete a single sample:
• Enter the viewing logged data mode and select the desired
sample number.
•Press SHIFT+HOLD. The "CFM" indication starts blinking asking
for confirmation.
• Press the SHIFT+CFM to confirm deletion.
Note: Press SHIFT+HOLD to escape without data deletion.
When viewing through the logged data, the "NULL" message will be displayed when
selecting a deleted sample.
To delete all data in memory:To delete all data in memory:
To delete all data in memory:To delete all data in memory:
To delete all data in memory:
• Enter the viewing logged data mode.
•Press SHIFT+TC. The "CFM" indication will start blinking asking
for confirmation.
• Press SHIFT and CFM to confirm deletion.
Note: Press SHIFT+TC to escape without data deletion.
Note: If no samples are stored in memory and a deletion is attempted, the meter will
show the message "Zero" and then returns to normal operational mode.

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DATA TRANSFER TO PC
Connect the meter to a PC through the RS232C output (the connector is located on the
top of the meter). Use MA 9351MA 9351
MA 9351MA 9351
MA 9351(5 to 9 pin) connection cable.
SpecificationsSpecifications
SpecificationsSpecifications
Specifications
Isolated 8-bit data transmission
Baud Rate: 2400
Start bit: 1
Stop bit: 1
Parity bit: none
Sending Commands from PCSending Commands from PC
Sending Commands from PCSending Commands from PC
Sending Commands from PC
With any terminal programs it is possible to remotely control the instrument. Connect
the meter to the PC through the MA 9351MA 9351
MA 9351MA 9351
MA 9351 cable, start the terminal program and set the
communication options as follows: 8, N, 1, no flow control.
To send a command to the meter the scheme is:
<command> <CR>
The computer sends the command expressed as a 3-character sequence and a CR
character.
Note:Note:
Note:Note:
Note: All the terminal programs that support the ANSI escape sequence, represent the
CR character with the string '^M'.
The commands available are as follows:
MOD - to request the firmware code of the meter.
RPA - to request the setup parameters setting.
LTB - to request the number of logged samples.
LOD - to request the logged data.
The meter answers with the following order:
status byte
date (ddmmyy)
time (hhmm)
measurement (binary)
temperature reading (binary)
At the end of the logged data the checksum (2 complement) is sent.
Note:Note:
Note:Note:
Note: The meter will send <CAN> if a corrupted or unknown command is received.

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BATTERY REPLACEMENT
When the battery is low the meter will display the blinking battery symbol in the lower left
corner of the LCD.
When the battery indicator appears, the meter can still work for about 20 hours.
A low battery condition will lead to unreliable readings. It is recommended to replace
immediately the battery.
Battery replacement must only take place in a non-hazardous area using a 9V alkaline
battery. Turn the meter off, remove the battery compartment cover on the rear of the
meter and replace the rundown battery with a new one.
Install the battery while paying attention to its polarity and reattach the cover.
CONDUCTIVITY VS TEMPERATURE CHART
The conductivity of an aqueous solution is the measure of its ability to carry an electrical
current by means of ionic motion. The conductivity invariably increases with increasing
temperature. It is affected by the type and number of ions in the solution and by the
viscosity of the solution itself. Both parameters are temperature dependent. The depen-
dency of conductivity on temperature is expressed as a relative change per degree
Celsius at a particular temperature, commonly as percent per °C.
The following table lists the temperature dependence of the Martini calibration buffers.
°C °F - - - - - -
(µS/cm)
19 66.2 11430 1251 74 71300 100200 4429
20 68 11670 1278 76 72400 102100 4523
21 69.8 11910 1305 78 74000 104000 4617
22 71.6 12150 1332 79 75200 105900 4711
23 73.4 12390 1359 81 76500 107900 4805
24 75.2 12640 1386 82 78300 109800 4902
25 77 1288012880
1288012880
12880 14131413
14131413
1413 8484
8484
84 8000080000
8000080000
80000 111800111800
111800111800
111800 50005000
50005000
5000
26 78.8 13130 1440 86 81300 113800 5096
27 80.6 13370 1467 87 83000 115700 5190
28 82.4 13620 1494 89 84900 117700 5286
29 84.2 13870 1521 90 86300 119700 5383
30 86 14120 1548 92 88200 121800 5479
31 87.8 14370 1575 94 90000 123900 5575

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ACCESSORIES
MA 814D/1MA 814D/1
MA 814D/1MA 814D/1
MA 814D/1 4-ring EC probe with DIN connector and 1 m (3.3’) cable
M1 0030BM1 0030B
M1 0030BM1 0030B
M1 0030B 12880 μS/cm calibration solution, 20 ml sachet, 25 pcs.
M1 0031BM1 0031B
M1 0031BM1 0031B
M1 0031B 1413 μS/cm calibration solution, 20 ml sachet, 25 pcs.
M1 0033BM1 0033B
M1 0033BM1 0033B
M1 0033B 84 μS/cm calibration solution, 20 ml sachet, 25 pcs.
M1 0035BM1 0035B
M1 0035BM1 0035B
M1 0035B 111.8 mS/cm calibration solution, 20 ml sachet, 25 pcs.
MA 9060MA 9060
MA 9060MA 9060
MA 9060 12880 μS/cm calibration solution, 230 ml bottle
MA 9061MA 9061
MA 9061MA 9061
MA 9061 1413 μS/cm calibration solution, 230 ml bottle
MA 9063MA 9063
MA 9063MA 9063
MA 9063 84 μS/cm calibration solution, 230 ml bottle
MA 9065MA 9065
MA 9065MA 9065
MA 9065 111.8 mS/cm calibration solution, 230 ml bottle
MA 9069MA 9069
MA 9069MA 9069
MA 9069 5000 μS/cm solution, 230 ml bottle
MA 9351MA 9351
MA 9351MA 9351
MA 9351 RS232 connection cable (5 to 9 pin) with 2 meters cable (for Mi306)
MA 9066MA 9066
MA 9066MA 9066
MA 9066 100% NaCl Calibration solution, 230 ml bottle
WARRANTYWARRANTY
WARRANTYWARRANTY
WARRANTY
These instruments are warranted against defects in materials and manufacturing for a
period of 3 years from the date of purchase. Electrodes and Probes are warranted for 6
months.
If during this period the repair or replacement of parts is required, where the
damage is not due to negligence or erroneous operation by the user, please return
the intruments, electrode and probe to either distributor or our office and the repair
will be effected free of charge.
Damage due to accidents, misuse, tampering or lack of prescribed maintenance is
not covered by the warranty.
Milwaukee/Martini instruments reserves the right to make improvements in design,Milwaukee/Martini instruments reserves the right to make improvements in design,
Milwaukee/Martini instruments reserves the right to make improvements in design,Milwaukee/Martini instruments reserves the right to make improvements in design,
Milwaukee/Martini instruments reserves the right to make improvements in design,
construction and appearance of its products without advance notice.construction and appearance of its products without advance notice.
construction and appearance of its products without advance notice.construction and appearance of its products without advance notice.
construction and appearance of its products without advance notice.
For your Safety don’t use or store the instrument in hazardous environments. To avoid
damages or burns, do not perform any measurement in microwave ovens.

THANK YOU FOR CHOOSING
Sales and Technical Service Contacts:
Milwaukee Electronics Kft.
Alsókikötősor 11.
6726, Szeged, Hungary
Tel: [phone]
Fax: [phone]
e-mail: [email protected]
Milwaukee Instruments, Inc.
2950 Business Park Drive Rocky Mount, NC
27804 USA
Tel: [phone]
Fax: [phone]
e-mail: [email protected]
www.milwaukeeinst.com
MANMI306 23/06