Hanna Instruments HI 93719 User manual

Instruction Manual
HI 93719
Magnesium Hardness
ISM
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HannaInstrumentsreservestherighttomodifythedesign,construction
andappearanceofitsproductswithoutadvancenotice.
WARRANTYWARRANTY
WARRANTYWARRANTY
WARRANTY
HI93719iswarrantedfor two years against defects in workman-
shipand materialswhenusedforits intendedpurposeandmaintained
accordingtoinstructions.
Thiswarranty islimitedto repairorreplacement freeofcharge.
Damages due to accident, misuse, tampering or lack of prescribed
maintenanceare not covered.
Ifserviceis required,contactthedealerfromwhom youpurchasedthe
instrument.Ifunderwarranty, report the model number, dateofpur-
chase,serialnumberandthe nature of the failure. Iftherepairisnot
coveredby the warranty,youwillbe notified ofthechargesincurred. If
theinstrumentistobereturnedtoHannaInstruments,firstobtaina
ReturnedGoodsAuthorizationNumber from the Customer Service de-
partmentand thensenditwith shipmentcostsprepaid.Whenshipping
anyinstrument, makesureitisproperly packagedforcompleteprotec-
tion.
Tovalidate yourwarranty,filloutandreturntheenclosedwarrantycard
within14 daysfromthedateofpurchase.
Allrightsare reserved. Reproduction inwholeor in part isprohibited
without the written consent of the copyright owner, Hanna Instru-
mentsInc.,Woonsocket, Rhode Island, 02895,USA.
DearCustomer,
Thank you for choosing a Hanna product. This manual will
provide you with the necessary information for the correct
operation of the meter. Please read it carefully before using
the meter. If you need additional technical information, do
not hesitate to e-mail us at [email protected].
This instrument is in compliance with directives
EN 50081-1 and EN 50082-1.
Remove the instrument from the packing material and
examine it carefully to make sure that no damage has
occurred during shipment. If there is any damage, notify
your Dealer.
Each Ion Specific Meter is supplied complete with
• 9V Battery
• Two Sample Cuvets and Caps
• One Transport Cap
Note: Conserve all packing material until the instrument
has been observed to function correctly. Any defective
item must be returned in its original packing.
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATIONPRELIMINARY EXAMINATION
PRELIMINARY EXAMINATION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION
The HI 93719 meter measures the magnesium hardness
content, as CaCO3, in water and wastewater in the 0.00 to
2.00 mg/L (ppm) range.
Themeter usesan exclusivepositive-locking systemto ensure
that the cuvet is in the same place every time it is placed
into the measurement cell.
The reagents are in liquid form and are supplied in bottles.
The amount of reagent is precisely dosed to ensure maxi-
mum repeatability.
Display codes aid the user in routine operations.
The meters have an auto-shut off feature that will turn the
instrument off after 10 minutes of non-use.
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONS
Range 0.00 to 2.00 mg/L
Resolution 0.01 mg/L
Accuracy ±0.11 mg/L ±5% of reading
TypicalEMC ±0.02 mg/L
Deviation
Light Source Light Emitting Diode @ 555 nm
Method Adaptation of the Standard Methods for
the Examination of Water and Wastewa-
ter,18th edition,EDTA colorimetricmethod.
The reaction between Mg and reagents
causes a violet tint in the sample
Light Detector SiliconPhotocell
Environment 0 to 50°C (32 to 122°F);
max 95% RH non-condensing
Battery Type/Life1 x 9 volt/40 hours
Auto-Shut off After 10' of non-use
Dimensions 180 x 83 x 46 mm (7.1 x 3.3 x 1.8")
Weight 290 g (10 oz.).
REQUIRED REAGENTS
Code Description Quantity
HI 93719A-0 Mg indicator 0.5 mL
HI 93719B-0 Alkalisolution 0.5 mL
HI 93719C-0 EDTAsolution 1 drop
HI 93719D-0 EGTAsolution 1 drop
REAGENT SETS
HI93719-01 Reagents for 100 tests
HI93719-03 Reagents for 300 tests
This indicates that the meter is in a
ready state and zeroing can be per-
formed.
Sampling in Progress. This prompt ap-
pears each time the meter is performing
a measurement.
This indicates that the meter is in a
zeroed state and measurement can be
performed.
A zero reading was not taken. Insert a
sample before adding reagent and press
ZERO.
Under range. A blinking "0.00" indicates
that the sample absorbs less light than
the zero reference. Check the procedure
and make sure you use the same cuvet
for reference (zero) and measurement.
Over range. A flashing value higher than
themaximumconcentrationreadable(see
specifications) indicates that the sample
absorbs too much light, meaning that
the concentration is too high. Dilute the
sample.
Light over range. The cuvet is not in-
serted correctly and an excess ambient
light is reaching the detector. If the cover
is properly installed, then contact your
dealer or the nearest Hanna Customer
Service Center.
Light under range. The zero sample is
too dark for proper zeroing. If this is not
the case, contact your dealer or the
nearest Hanna Customer Service Center.
The "V" indicates that the battery volt-
age is getting low and the battery needs
to be replaced.
This indicates that the battery is dead
and must be replaced.
Note: once this indication is displayed,
the meter will lockup. Change the bat-
tery to restart.
DISPLAY CODE GUIDEDISPLAY CODE GUIDE
DISPLAY CODE GUIDEDISPLAY CODE GUIDE
DISPLAY CODE GUIDE
V

OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDE
MEASUREMENT PROCEDURE
• Turn the meter on by pressing ON/OFF.
• When the LCD displays "- - -", it is
ready.
• Fill a graduated beaker to the
50 mL mark with the sample.
• Add0.5 mL of HI 93719A Magne-
sium indicator solution, then swirl
to mix.
• Add 0.5 mL of HI 93719B Alkali
solutionforMagnesium,thenswirl
to mix.
• Fill two cuvets up to 1.5 cm
(¾") below the rim with 10
mL of sample each.
• Add 1 drop of HI 93719C EDTA
solution to one cuvet, replace the
cap and swirl the solution. This is
the blank.
• Add 1 drop of HI 93719D EGTA
solution to the second cuvet, re-
place the cap and swirl the
solution. This is the sample.
• Place the blank into the
holder and ensure that the
notch on the cap is posi-
tioned securely into the
groove.
• Press ZERO and "SIP" will appear on the display.
A
B
1.5 cm 1.5 cm
ON
OFF
D
ZERO
• Wait for a few seconds and the display
will show "-0.0-". Now the meter is
zeroed and ready for measurement.
• Remove the blank and insert
the sample into the instrument,
making sure that the notch on
the cap is positioned securely
into the groove.
• Press READ TIMED and the display will show the count-
down prior to the measurement. Alternatively wait for
exactly 30 seconds and press READ DIRECT. In both
cases “SIP” will appear during measurement.
• The instrument directly displays concentration in mg/L
(ppm) of magnesium hardness, as CaCO3, on the Liquid
Crystal Display. To convert the result to mg/L Mg,
multiply the reading by 0.243.
Note: thetest willdetectany calciumor magnesium contami-
nation in the mixing cylinders, measuring droppers or
samplecells. To test cleanliness, repeat the testmultiple
times until you obtain consistent results.
SAMPLE DILUTION
This meter is designed to determine low levels of hardness,
typically found in water purification systems.
When testing some other sources of water, it is not uncom-
mon to come across levels of hardness that are greater than
the range of this meter.
This problem can be overcome through dilution. Dilutions
must be performed with hardness-free water or the readings
will be erroneous.
A dilution to reduce the level of hardness by a factor of one
hundred is performed as follows:
• Fill a 1 mL syringe with the sample.
• Place the syringe in a 50 mL beaker, making sure that
the beaker is clean and empty, and inject 0.5 mL into
the beaker.
• Fill the beaker up to the 50 mL mark with hardness-free
water.
Now, follow normal measurement procedure. The true value
READ
TIMED
The instruction listed below should be carefully followed
during testing to ensure best accuracy.
• Do not touch the cuvet walls with hands.
• In order to maintain the same conditions during the
zeroing and the measuring phases, it is necessary to
close the cuvet to prevent any contamination.
• Do not let the test sample stand too long after reagent
is added or accuracy will be lost.
• Whenever the cuvet is placed into the measurement cell,
it must be completely free of fingerprints, oil or dirt.
Wipe it thoroughly with HI 731318 or a lint-free cloth
prior to insertion.
• It is important that the sample does not contain any
debris. This would corrupt the readings.
• It is possible to take multiple readings in a row, but it
is recommended that a zero reading be taken for each
sample and that the same cuvet is used for zeroing and
measurement.
• It is important to discard the sample immediately after
the reading is taken because the glass might become
permanently stained.
• Shaking the cuvet can generate bubbles in the sample,
causing higher readings. To obtain accurate measure-
ments, remove such bubbles by swirling or by gently
tapping the vial.
• All the reaction times reported in this manual are
referred to 20°C (68°F). As a general rule of thumb,
they should be doubled at 10°C (50°F) and halved at
30°C(86°F).
TIPS FOR AN ACCURATETIPS FOR AN ACCURATE
TIPS FOR AN ACCURATETIPS FOR AN ACCURATE
TIPS FOR AN ACCURATE
MEASUREMENTMEASUREMENT
MEASUREMENTMEASUREMENT
MEASUREMENT
of the sample is the reading obtained multiplied by a factor
of one hundred (the dilution factor).
For your reference, factors to convert readings in mg/L to
French degrees (FD), German degrees (DD) and English
degrees (ED) of hardness are as follows:
1 mg/L = 0.1 FD = 0.056 DD = 0.07 ED.
INTERFERENCES
Interference may be caused by excessive amounts of heavy
metals.
RecommendationsforUsers
Before using these products, make sure that they are entirely suitable for the environ-
mentinwhichtheyareused.
Operationoftheseinstrumentsinresidentialareacouldcauseunacceptableinterferences
toradioandTV equipments, requiring the operatortotakeallnecessary steps to correct
interferences.
Any variation introduced by the user to the supplied equipment may degrade the
instruments'EMCperformance.
Toavoiddamagesorburns,donotperformanymeasurementinmicrowaveovens.
ACCESSORIESACCESSORIES
ACCESSORIESACCESSORIES
ACCESSORIES
REAGENT SETS
HI93719-01 Reagents for 100 tests
HI93719-03 Reagents for 300 tests
OTHER ACCESSORIES
HI710009 Blue rubber boot
HI710010 Orange rubber boot
HI721310 9V battery (10 pcs)
HI731318 Tissue for wiping cuvets (4 pcs)
HI731321 Glass cuvets (4 pcs)
HI731325 Caps for cuvets (4 pcs)
HI93703-50 Cuvets cleaning solution (230 mL).
CE DECLARATIONCE DECLARATION
CE DECLARATIONCE DECLARATION
CE DECLARATION
OF CONFORMITYOF CONFORMITY
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IST93719R1 06/98
PRINTED IN PORTUGAL