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Back To Hanna's Main Product
Listing Page Need
a New Electrode or Power Cord? REPLACEMENT
PARTS
The following was taken from the HANNA Instruments Catalog in Section G:
WHY DO I NEED SOLUTIONS AND WHAT
ARE THEY?
It
is difficult to exaggerate the importance of buffer and maintenance solutions.
Expensive equipment is often utilized well below its full capabilities due to
lack of proper maintenance of sensors. With Hanna solutions, this is no
longer a problem. All solutions are prepared with carefully weighed
chemicals of the highest grade following International Laboratory Practice
guidelines. Due to the sheer volume of solutions produced, the quantity of
chemicals used provides a much better resolution than if small volumes were
prepared by a lab tech. The pH, ORP, Refill, Storage, Cleaning, Sodium and
Sodium Chloride solutions give you the advantage of being able to perform
accurate calibration at a minimal cost even out in the field.
The quality of the buffers depends on
the quality and weight of the chemicals and distilled water as well as many
other factors such as temperature control and the instrumentation used for their
preparation. At Hanna, buffers are prepared with analytical grade
chemicals in a clean laboratory environment and using high-tech reference
material.
pH Testers
pH buffers are certified to +/- 0.01
accuracy at 25o C and carry individual expiration dates. It
comes as a pleasant surprise to know that Hanna solutions often cost less than
"freshly" prepared buffers! The range of Hanna standardization
and maintenance solutions is such to satisfy the varied needs of the users.
GO TO:
Tips To Ensure Long Electrode Life
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EXPIRY DATE |
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Hanna buffer solution carries a label showing the lot # and expiration
date to ensure maximum accuracy and safety.
We ensure our Stock here is properly rotated and
will not send you anything close to expiration.
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CALIBRATION
SOLUTIONS |
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To ensure optimum accuracy time after time, calibrate your instruments
using the Hanna buffers in the exclusive FDA approved
bottles. The buffer values in these leakproof opaque bottles
remain unchanged even under direct light.
Temperature Charts
are included on each bottle of solution. |
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SACHETS ARE
CONVENIENT AND ECONOMICAL! |
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Hanna's popular sachet solutions are now also available in combination
kits suitable for dual range meters and 2-point calibration.
Sachet solutions now also come with Certificate of Analysis. |
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| 20
mL Sachets are ideal for infrequent calibrations while for heavy-duty
applications, you can choose from the popular 230 mL and 460 mL
containers. |
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pH 7.01 is the most commonly used Buffer Solution. |
HANNA RECOMMENDS CLEANING &
STORAGE SOLUTIONS
Clean the liquid junction of your
electrodes once a day or at least once a week to prevent clogging and to
maintain accuracy.
Hanna Storage Solutions are prepared with
high grade Potassium Chloride and Potassium Hydrogen Phthalate by titration with
NIST 2201 standardized Silver Nitrate and NIST 84j standardized Sodium Hydroxide
Solution, respectively.
By conditioning your ORP electrodes in a
Hanna ORP Pretreatment Solution you can speed up your measurements.
TIPS
TO ENSURE LONG ELECTRODE LIFE
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Proper electrode
storage maximizes electrode performance and extends electrode life.
The electrodes should not be stored in distilled water. The filling
solution will be diluted and the electrode response will be slow. If using a
refillable pH electrode, the fill hole should be covered overnight and
during storage. The fill hole cover must be removed during calibration
and measurement to ensure a uniform flow of electrode filling solution. The
best way to store the electrode is to read the included manual.
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Maintenance and
cleaning. The electrode should be inspected weekly for
scratches, cracks, or salt crystalization. Follow instructions and do not
clean excessively.
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Calibration.
To verify electrode slope and proper function, calibration must be performed
each day before any samples are measured and recalibrated every couple of
hours to ensure that correct slope is used to calculate the sample pH. If
the user is unsure of the sample range, a pH test strip can quickly
determine the approximate sample pH. TIP: At
least once a day, the electrode should be calibrated with 2 or 3 buffers or
standards that bracket the expected sample range.
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Filling solution
level. Different styles of electrodes are available that offer
features for the wide range of pH applications. The filling solution
level must be higher than the sample level to maintain a uniform flow of
filling solution.
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Stirring during all
measurements. All buffers, standards, and samples should be
stirred at a uniform rate to obtain a representative sample measurement and
improve electrode response time.
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Rinsing between
measurements. Rinsing prevents contamination by carryover on
the electrodes. Tip: The electrode should be rinsed with deionized
water or an aliquot of the next buffer or sample. Caution: the pH electrode
glass bulb should not be wiped.
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pH buffers and
standards. pH buffers and standards should be accurate and
free of contamination. If special buffers are made in the lab, volumetric
glassware should be used. Tips: Keep your bottle tightly
shut. Check expiration dates.
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Temperature. To
account for pH slope, buffer and sample changes, a separate or integrated
automatic temperature comp. probe or digital LogR should be used. pH is
readily temperature correctable.
Feel free to contact Hanna Instruments at www.hannainst.com
for more information!
Need a New Electrode or Power Cord?
REPLACEMENT
PARTS
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