Hanna Instruments HI 96751 - Manual (Page 3)

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GENERAL DESCRIPTION
ABBREVIATIONS
SPECIFICATIONS
PRECISION AND ACCURACY
The HI 96751 is an auto diagnostic portable microprocessor meter that benefits from Hanna’s
years of experience as a manufacturer of analytical instruments. It has the advanced optical
system based on a Light Emitting Diode (LED) and a narrow band interference filter that allows
most accurate and repeatable readings. All instruments are factory calibrated and the electronic
and optical design minimizes the need of frequent calibration.
With the powerful CAL CHECK
TM validation function, you are able to validate good performance
of your instrument at any time. The validation procedure is extremely user friendly. Just use the
exclusive HANNA ready-made, NIST traceable standards to verify the performance of the
instrument and recalibrate if necessary.
All instruments are splash waterproof and the LED and filter units are protected from dust or dirt
by a transparent cup. This makes the instruments fulfill field applications. Display messages aid
the user in routine operation. The meter has an auto-shut off feature that will turn off the
instrument after 10 minutes of non use in
measurement mode or after 1 hour if left in
calibration mode.
The meter uses an exclusive positive-locking system to ensure that the cuvette is in the same
position every time it is placed into the measurement cell. It is designed to fit a cuvette with a
larger neck making it easier to add both sample and reagents. The cuvette is made from special
optical glass to obtain best results.
The HI 96751 meter measures the sulfate content in water samples in the 0 to 150 mg/L (ppm) range.
Sulfate is precipitated with barium chloride crystals.
The reagent is in
powder form and is supplied in packets. The amount of reagent is precisely
dosed to ensure the maximum repeatability.
degree Celsius
degree Fahrenheit
milligrams per liter. mg/L is equivalent to ppm (parts per million)
milliliter
millivolts °C :
°F :
mg/L :
mL :
mV:
Range 0 to 150 mg/L
Resolution 1 mg/L
Accuracy ±1 mg/L ±5% of reading @ 25°C
Typical EMC Deviation ±1mg/L
Light Source Light Emitting Diode
Light Detector Silicon Photocell with narrow band interference filter @ 466 nm
Method Sulfate is precipitated with barium chloride crystals. Light absorbance
of the suspension is measured.
Environment 0 to 50°C (32 to 122°F); max 95% RH non-condensing
Battery Type 1 x 9 volt
Auto-Shut off After 10' of non-use in measurement mode;
after 1 hour of non-use in calibration mode;
with last reading reminder.
Dimensions 192 x 104 x 69 mm (7.6 x 4.1 x 2.7”)
Weight 360 g (12.7 oz.).
REQUIRED REAGENTS
Code
Description Quantity/test
HI 93751-0 Indicator Reagent 1 packet
Precision Precision Precision Precision Precision is how closely repeated measurements
agree with each other. Precision is usually
expressed as standard deviation (SD).
Accuracy
Accuracy Accuracy Accuracy Accuracy is defined as the nearness of a test
result to the true value.
Although good precision suggests good accuracy,
precise results can be inaccurate. The figure
explains these definitions.
In a laboratory using a standard solution of 75
mg/L sulfate and a representative lot of reagent,
an operator obtained with a single instrument a
standard deviation of 3 mg/L.