Hanna Instruments HI 9835 User manual

Instruction Manual
HI 9835
Autoranging
Portable Waterproof
Microprocessor
EC/TDS/NaCl/°C Meter
Manufacturers since 1978 This Instrument is in
Compliance with the CE Directives

2
Dear Customer,
Thank you for choosing a Hanna product.
Please read this instruction manual carefully before using the instru-
ment.
This manual will provide you with the necessary information for a
correctuseoftheinstrument,aswellasapreciseideaofitsversatility.
Ifyou needadditional technicalinformation, donot hesitateto e-mail
us at [email protected].
These instruments are in compliance with directives
EN 50081-1, EN 50082-1 and EN 61010-1.
PRELIMINARY EXAMINATION ..................................................................3
GENERAL DESCRIPTION..........................................................................3
FUNCTIONAL DESCRIPTION.....................................................................4
SPECIFICATIONS ....................................................................................5
CONNECTIONS.......................................................................................6
TAKING MEASUREMENTS .......................................................................7
AUTORANGING ......................................................................................8
TEMPERATURE COMPENSATION ..............................................................8
EC / TDS CALIBRATION ..........................................................................9
NaCl CALIBRATION...............................................................................10
TEMPERATURE CALIBRATION ................................................................11
TEMPERATURE ADJUSTMENT................................................................11
CONDUCTIVITY VS. TEMPERATURE CHART .............................................12
SETUP.................................................................................................13
BATTERY REPLACEMENT .......................................................................15
PROBE MAINTENANCE .........................................................................15
ACCESSORIES ......................................................................................16
WARRANTY..........................................................................................18
CE DECLARATION OF CONFORMITY........................................................19
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner,
Hanna Instruments Inc., 584 Park East Drive, Woonsocket, Rhode
Island, 02895 , USA.
Visit our Internet Home Page:
http://www.hannainst.com

3
Remove the instrument from the packing material and examine it
carefully to make sure that no damage has occurred during shipping.
If there is any damage, notify your Dealer.
Each meter is supplied complete with:
• HI76309Conductivity/TDS probe
•AA size Alkaline Batteries (4 pcs)
•Rugged Carrying Case.
Note:Saveallpackingmaterialuntilyouaresurethattheinstrument
functions correctly. Any defective item must be returned in its
original packaging together with the supplied accessories.
HI 9835 is a waterproof portable microprocessor-based Conductivity/
TDS/NaCl/temperaturemeter.
The autoranging feature of the EC and TDS ranges automatically sets
the meter to the scale with the highest possible resolution.
Themeasurementsareautomatically(ATC)ormanually (MTC) compen-
sated for temperature. The temperature coefficient value is user
selectable. It is possible to disable the temperature compensation and
measure the actual conductivity.
The meter is equipped with a stability indicator.
The Battery Error Preventing System (BEPS) switches the meter off
when the batteries are too weak to support proper function.
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION

4
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
1) Power adapter socket
2) Probe Connector
3) Liquid Crystal Display (LCD)
4) ON/OFF key, to turn the meter on and off
5) ALT key, to alternate key function
6) RANGE / FIXED key, to select measurement range or (with ALT)
to freeze the current range on the LCD
7) CAL / CALT key, to enter calibration mode
8) !CFM key, to move down or (with ALT) confirm values
9) ATC / TC key, to select temperature compensation mode or (with
ALT) to view the temperature coefficient value
10)"FNC key, to move up or (with ALT) enter setup mode

5
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS
Range EC 0.00 to 29.99 µS/cm
(Autoranging) 30.0to 299.9µS/cm
300 to 2999 µS/cm
3.00to 29.99mS/cm
30.0to 200.0mS/cm
Up to 500.0 mS/cm actual(*) Conductivity
TDS 0.00 to 14.99 ppm
(Autoranging) 15.0 to 149.9 ppm
150 to 1499 ppm
1.50 to 14.99 g/L
15.0 to 100.0 g/L
Up to 400.0 g/L actual(*) TDS(with 0.80factor)
NaCl 0.0 to 400.0 %
Temp. 0.0 to 60.0 °C
Resolution EC 0.01µS/cm (from0.00 to29.99 µS/cm)
0.1µS/cm (from30.0 to 299.9 µS/cm)
1 µS/cm (from 300 to 2999 µS/cm)
0.01mS/cm (from3.00 to 29.99 mS/cm)
0.1mS/cm (over30.0 mS/cm)
TDS 0.01 ppm (from 0.00 to 14.99 ppm)
0.1 ppm (from 15.0 to 149.9 ppm)
1 ppm (from 150 to 1499 ppm)
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
Accuracy EC ±1% of reading ± (0.05 µS/cm or 1 digit,
whichever greater)
TDS ±1% of reading ± (0.03 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
(*) Actual conductivity (or TDS) is the non-temperature compensated conductivity (or
TDS) value of a solution.

6
EC Calibration 1 pointwith 6 memorized buffers
84,1413,5000,12880,80000,111800µS/cm
NaCl Calibration 1point with HI 7037 buffer (optional)
Temperature 2points 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
TDSFactor 0.40 to 0.80 (default value is 0.50)
Probe HI 76309 4-ring probe, K=1 nominal and
built-in temperature sensor (included)
Auto Off After 5 minutes (can be disabled)
Powersupply 4x1.5VAA alkaline typebatteries (included),or
12 VDC adapter
Casing IP 67
Environment 0 to 50°C ; 100% RH
Dimensions 196 x 80 x 60 mm (7.7 x 3.1 x 2.4")
Weight 500 g (18 oz)
CONNECTIONSCONNECTIONS
CONNECTIONSCONNECTIONS
CONNECTIONS
Removetheback cover,unwrapthe batteries
and install them while paying attention to
the polarity. Replace the back cover.
Alternatively, connect the voltage adapter to
the power socket.
Connect the EC/TDS probe to the
7-pin connector located on the top
of the instrument. Tighten the
threaded ring.
Makesuretheprobesleeveisprop-
erlyinserted,asshowninthefigure.

7
Press the ON/OFF key to turn the meter on.
Immerse the probe into the solution to be tested.
The sleeve holes must be completely submerged.
Taptheproberepeatedlytoremoveanyairbubbles
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:
IIf the meter displays "----" the reading is out of range.
II If the reading is unstable, the stability indicator " " blinks.
III The "gm" indication on the LCD means g/L.
IV Makesure the meteris calibratedbeforetaking measurements.
VIf measurements are taken successively in different samples, to
have accurate readings it is recommended to rinse the probe
thoroughlywithdeionizedwaterbeforeimmersioninthesamples.
VI 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 for de-
tails).
VII 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 for
details).
VIII Whentheuseofanalternatefunction(FNC,CFM,GLP,FIXED,TC
and CALT) is requested, press and hold the ALT key first and
then the second key.
TAKING MEASUREMENTSTAKING MEASUREMENTS
TAKING MEASUREMENTSTAKING MEASUREMENTS
TAKING MEASUREMENTS

8
TEMPERATURE COMPENSATIONTEMPERATURE COMPENSATION
TEMPERATURE COMPENSATIONTEMPERATURE COMPENSATION
TEMPERATURE COMPENSATION
Three options of compensating temperature are available:
Automatic (Atc): The probe has a built-in temperature sensor; the
value of the temperature is used to automatically compensate the EC/
TDS reading using 25°C as reference temperature. 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
compensationis referencedat 25°C.The "°C"symbol blinkswhen 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 "°C" and "%TC" symbols
blink when this option is active.
To select the desired option press the ATC key until
the option is briefly displayed on the LCD.
Note: The default compensation mode is ATC.
If temperature compensation is active, measurements are compen-
sated 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 for details).
The current temperature coefficient can be
quickly viewed pressing ALT+TC. The value
is briefly displayed on the lower LCD.
The EC and TDS scales are autoranging. The meter automatically sets
the scale with the highest possible resolution.
BypressingALT+FIXED,the autoranging
feature is disabled and the current range
is frozen on the LCD. "F1" symbol blinks
on the LCD.
To restore the autoranging option press ALT+FIXED again.
Note: AutorangingisautomaticallyrestorediftheRANGEkeyispressed,
ifthesetup or calibrationmodesareentered and ifthemeteris
turned off and back on again.
AUTORANGINGAUTORANGING
AUTORANGINGAUTORANGING
AUTORANGING

9
EC/TDS CALIBRATIONEC/TDS CALIBRATION
EC/TDS CALIBRATIONEC/TDS CALIBRATION
EC/TDS CALIBRATION
Calibration is a 1-point procedure. Selectable calibration points are:
0.0,84.0µS,1413µS,5.00mS,12.88mS,80.0mS,111.8mS.
Toenter EC calibrationselectthe ECrangeand 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.
For zero calibration, just leave the dry probe in air.
The indications "BUF" and "CAL" are dis-
played.TheupperLCDshowstheuncalibrated
EC reading. The lower LCD shows the buffer
value. The stability indicator " " blinks.
Select the desired value with the "
and !keys, if necessary.
When the " " symbol stops blinking, the
readingisstable.The "CON"indicationstarts
blinking on the LCD asking for confirmation.
PressALT+CFMtoconfirmthecalibration.
If everything is satisfactory, the meter displays the "Stor Good" mes-
sage and returns to measurement mode.
Notes
IIf the uncalibrated reading is too far from the expected value,
calibration is not recognized. The "CON" indication does not
appear; the " " and "BUF" symbols blink to signal wrong or
contaminated calibration solution.
II For best results choose an EC buffer value close to the sample
to be measured.

10
NN
NN
Naa
aa
aCC
CC
Cllll lCALIBRATIONCALIBRATION
CALIBRATIONCALIBRATION
CALIBRATION
Calibration is 1-point at 100.0% NaCl. Use the HI 7037 calibration
solution (sea water solution) as a 100% NaCl standard solution.
To enter NaCl calibration select the NaCl range and
press the CAL key.
Rinse the probe with some of the calibration solution or
deionized water. Immerse the probe into HI 7037 solu-
tion. The sleeve holes must be completely submerged.
Taptheproberepeatedlyto remove anyairbubblesthat
may be trapped inside the sleeve.
The indications "BUF" and "CAL" are dis-
played.TheupperLCDshowstheuncalibrated
NaCl reading in percentage. The lower LCD
shows"100".
When the " " symbol stops blinking, the
readingisstable.The "CON"indicationstarts
blinking on the LCD asking for confirmation.
PressALT+CFMtoconfirmthecalibration.
If everything is satisfactory, the meter displays the "Stor Good" mes-
sage and returns to measurement mode.
Note: If the uncalibrated reading is too far from the expected value,
thecalibrationisnot recognized. The"CON"indicationdoesnot
appear; the " " and "BUF" symbols blink to signal wrong or
contaminated calibration solution.
Note: The meter uses 1.90%/°C compensation factor during calibra-
tion. If the setup item "tc" has been set to a different value,
whenexitingcalibrationmodethevaluedisplayedontheupper
LCD could be different from the nominal calibration value.
III In order to minimize any EMC interference, use plastic beakers.
IV The meter uses 1.90%/°C compensation factor during calibra-
tion. 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.
VIt 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).

11
TEMPERATURE CALIBRATIONTEMPERATURE CALIBRATION
TEMPERATURE CALIBRATIONTEMPERATURE CALIBRATION
TEMPERATURE CALIBRATION
((
((
(for technical personnel only)for technical personnel only)
for technical personnel only)for technical personnel only)
for technical personnel only)
The calibration is 2 points at 0.0, 50.0°C.
• Immerse the probe in a 0°C temperature bath.
• Press ALT+CALT to enter temperature calibration mode.
• The lower LCD displays "0.0 °C"; "BUF" and "CAL" tags appear.
• When the reading is stable, "CON" symbol starts to blink.
• Press ALT+CFM to confirm. The lower LCD displays 50.0°C.
• Immerse the probe in a 50°C temperature bath.
• When the reading is stable, "CON" symbol starts to blink.
• Press ALT+CFM to confirm and return to normal operation.
TEMPERATURE ADJUSTMENTTEMPERATURE ADJUSTMENT
TEMPERATURE ADJUSTMENTTEMPERATURE ADJUSTMENT
TEMPERATURE ADJUSTMENT
Thetemperature reading can be manuallyfine-tuned byfollowing this
procedure:
Press ALT+CALT to enter the temperature
calibrationmode.
PressCALtoenterthetemperatureadjustmentmode.
The upper and lower LCD will display the current
temperature reading.
Adjust the temperature reading on
the upper LCD using the arrow keys.
The maximum adjustment is ±1°C
around current reading.
Press ALT+CFM to confirm. The meter re-
turns to measurement mode and displays
the new temperature.
Note: Press ALT+CALT to escape without any changes.
Note: It ispossible toenter thetemperature adjustmentmode only if
theprobe is connected.

12
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.
Itisaffectedbythetypeandnumberofionsinthesolutionandbythe
viscosity of the solution itself. Both parameters are temperature de-
pendent. The dependency 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 HANNA
calibrationbuffers.
°C °F HI 7030 HI 7031 HI 7033 HI 7034 HI7035 HI 7039
HI8030 HI8031 HI8033 HI8034 HI8035 HI8039
(µS/cm) (µS/cm) (µS/cm) (µS/cm) (µS/cm) (µS/cm)
0 32 7150 776 64 48300 65400 2760
5 41 8220 896 65 53500 74100 3180
10 50 9330 1020 67 59600 83200 3615
15 59 10480 1147 68 65400 92500 4063
16 60.8 10720 1173 70 67200 94400 4155
17 62.6 10950 1199 71 68500 96300 4245
18 64.4 11190 1225 73 69800 98200 4337
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 12880 1413 84 80000 111800 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
CONDUCTIVITY VERSUSCONDUCTIVITY VERSUS
CONDUCTIVITY VERSUSCONDUCTIVITY VERSUS
CONDUCTIVITY VERSUS
TEMPERATURE CHARTTEMPERATURE CHART
TEMPERATURE CHARTTEMPERATURE CHART
TEMPERATURE CHART

13
Setup is used to view or change the instrument parameters.
To enter setup press ALT+FNC when the
meter is in measurement 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 ALT+CFM to confirm.
Note: If ALT+FNC are pressed before item confirmation, the meter
will escape and return to measurement mode.
Once the desired setup item has been se-
lected, its current value blinks (if it is a
changeable parameter).
To change the value use the "or
!key.
Press ALT+CFM to confirm.
Note: Press ALT+FNC before confirmation to escape without chang-
ing the previously set value.
The following table lists the setup items, their valid range of values
and the factory settings (default):
SETUPSETUP
SETUPSETUP
SETUP

14
Item Description Valid values Default
tc Temp. compensation coeff. 0.00 to 6.00%/°C 1.90
tcE Temp. compensation mode Atc, Mtc, notc Atc
tdS TDS factor 0.40 to 0.80 0.50
CEL Cell constant (K) 0.500to1.700 1.000
Aof Auto-Off enable On, OFF On
vEr Firmware release
Chr Battery level test
Notes
IOnce enabled, the Auto Off time is fixed at 5 minutes.
II When the battery level test is selected (Chr), LCD will display the
remainingpercentageofbatterycharge.100%meansfullycharged
battery and 0% corresponds to the minimum battery level that
allows the meter to operate.
Thebattery chargelevel calculationis based on a typical alkaline
battery discharge curve.
Ifthe meteris connected toan externalpower adapter and "Chr"
is selected, the LCD will display "LINE".

15
PROBE MAINTENANCEPROBE MAINTENANCE
PROBE MAINTENANCEPROBE MAINTENANCE
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.
When the batteries are inserted and no power adapter is connected,
the meter can recognize the following battery charge levels:
•Low battery - "LOBAT" indication is displayed on the LCD. Back-
light is automatically disabled and it is not possible to enable it
until new batteries are inserted or an external power adapter is
used. When "LOBAT" appears, batteries have typically 10% of
their life left and the meter is still measuring properly.
•Very weak battery - The meter shuts off to avoid erroneous
operations.
Note: If the meter is not powered for several minutes (e.g. in dead
battery condition), the current date and time are lost.
Battery replacement must only take place in a non-hazardous area
using 1.5V alkaline AA type batteries.
In order to replace run down batteries, simply
removethe twoscrews onthe rearcover ofthe
instrument and replace the four 1.5V AA bat-
teries with new ones, paying attention to the
correctpolarity.
New batteries allow 150 hours approx. of continuous use (with 2700
mA/h batteries and without backlight)
A 12VDC power adapter can also be used. It is recommended to use
the Hanna voltageadaptersthat usetheproper polarityconfiguration.
However, other adapters can be used. In
this case, check the polarity of your adapter
before connecting it to the meter.
BATTERY REPLACEMENTBATTERY REPLACEMENT
BATTERY REPLACEMENTBATTERY REPLACEMENT
BATTERY REPLACEMENT

16
CONDUCTIVITY BUFFER SOLUTIONS
HI 70030P 12880µS/cm(µmho/cm),20mLsachets(25pcs.)
HI 7030L 12880µS/cm (µmho/cm),460mL bottle
HI 7030M 12880 µS/cm(µmho/cm), 230mLbottle
HI 70031P 1413 µS/cm (µmho/cm), 20mL sachets (25 pcs.)
HI 7031L 1413µS/cm (µmho/cm), 460mL bottle
HI 7031M 1413 µS/cm(µmho/cm), 230mL bottle
HI 70033P 84 µS/cm (µmho/cm), 20mL sachets (25 pcs.)
HI 7033L 84 µS/cm (µmho/cm), 460 mL bottle
HI 7033M 84 µS/cm (µmho/cm), 230 mL bottle
HI 7034L 80000µS/cm (µmho/cm),460mL bottle
HI 7034M 80000 µS/cm(µmho/cm), 230mLbottle
HI 7035L 111800µS/cm (µmho/cm),460mL bottle
HI 7035M 111800 µS/cm(µmho/cm), 230mL bottle
HI 70039P 5000 µS/cm (µmho/cm), 20mL sachets (25 pcs.)
HI 7039L 5000µS/cm (µmho/cm), 460mL bottle
HI 7039M 5000 µS/cm(µmho/cm), 230mL bottle
HI 7037L 100% NaCl sea water standard solution, 460mL
CONDUCTIVITY BUFFER SOLUTIONS
IN FDA APPROVED BOTTLES
HI 8030L 12880 µS/cm (µmho/cm), 460 mL bottle
HI 8031L 1413 µS/cm (µmho/cm), 460 mL bottle
HI 8033L 84 µS/cm (µmho/cm), 460 mL bottle
HI 8034L 80000 µS/cm (µmho/cm), 460 mL bottle
HI 8035L 111800 µS/cm (µmho/cm), 460 mL bottle
HI 8039L 5000 µS/cm (µmho/cm), 460 mL bottle
PROBE CLEANING SOLUTIONS
HI 7061M General Cleaning Sol., 230 mL bottle
HI 7061L General Cleaning Sol., 460 mL bottle
PROBE CLEANING SOLUTIONS
IN FDA APPROVED BOTTLES
HI 8061M General Cleaning Sol., 230 mL bottle
HI 8061L General Cleaning Sol., 460 mL bottle
ACCESSORIESACCESSORIES
ACCESSORIESACCESSORIES
ACCESSORIES

17
OTHER ACCESSORIES
HI 76309 stainless steel 4-ring conductivity/TDS probe with
temperature sensor and 1m (3.3') cable.
HI 76310 platinum 4-ring conductivity/TDS probe with tem-
perature sensor and 1m (3.3') cable.
HI 710005 12VDC voltage adapter (US plug)
HI 710006 12VDC voltage adapter (European plug)
HI 710012 12VDC voltage adapter (UK plug)
HI 710013 12VDC voltage adapter (S. Africa plug)
HI 710014 12VDC voltage adapter (Australian plug)
HI 740027 1.5V AA batteries (4 pcs)
HI 740036 100mL plastic beaker (6 pcs)
HI 740034 Cap for 100mL beakers (6 pcs)
HI 76405 Electrode holder

18
WARRANTYWARRANTY
WARRANTYWARRANTY
WARRANTY
AllHanna Instruments meters arewarranted fortwo years against
defects in workmanship and materials when used for their intended
purpose and maintained according to instructions. The electrodes
and the probes are warranted for a period of six months. This
warranty is limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering or lack of prescribed
maintenance are not covered.
Ifservice is required,contactthe dealerfromwhom youpurchasedthe
instrument. If under warranty, report the model number, date of
purchase, serial number and the nature of the failure. If the repair is
not covered by the warranty, you will be notified of the charges
incurred.IftheinstrumentistobereturnedtoHannaInstruments,first
obtain a Returned Goods Authorization number from the Customer
Service department and then send it with shipping costs prepaid.
When shipping any instrument, make sure it is properly packaged for
complete protection.
To validate your warranty, fill out and return the enclosed warranty
card within 14 days from the date of purchase.
Hanna Instruments reserves the right to modify the design, construc-
tion and appearance of its products without advance notice.

19
CE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITY
CE DECLARATION OF CONFORMITYCE DECLARATION OF CONFORMITY
CE DECLARATION OF CONFORMITY
RecommendationsforUsers
Beforeusingthisproduct,makesurethatitis entirelysuitablefortheenvironmentinwhichitisused.
OperationofthisinstrumentinresidentialareacouldcauseunacceptableinterferencetoradioandTV
equipment,requiring theoperator totakeall necessarystepsto correctinterference.
Themetalbandsoftheprobearesensitivetoelectrostaticdischarges.Avoidtouchingthesemetalbands
atalltimes.
TomaintaintheEMC performanceof thisequipmenttherecommendedcables mustbeused.
Any variation introduced by the user to the supplied equipment may degrade the instruments EMC
performance.
Toavoidelectricalshock,donotusethisinstrumentwhenvoltageatthemeasurementsurfaceexceeds
24VACor 60VDC.
Toavoiddamagesorburns,donotperformanymeasurementin microwaveovens.