Hanna Instruments HI 96720 - Manual (Page 3)

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GENERAL DESCRIPTION
ABBREVIATIONS
SPECIFICATIONS
PRECISION AND ACCURACY
The HI 96720 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 special tungsten lamp 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 lamp 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 96720 meter measures the calcium hardness content, as CaCO
3
, in water and wastewater in the
0.00 to 2.70 mg/L (ppm) range. The method is an adaptation of the Standard Methods for the
Examination of Water and Wastwater, 18
th edition, calmagite method.
The reagents are in liquid form and are supplied in bottles. The amount of reagent is precisely
dosed to ensure the maximum repeatability.
degree Celsius
degree Fahrenheit
Liquid Crystal Display
milligrams per liter. mg/L is equivalent to ppm (parts per million)
milliliter
millivolts °C :
°F :
LCD:
mg/L :
mL :
mV:
Range 0.00 to 2.70 mg/L
Resolution 0.01 mg/L
Accuracy ±0.11 mg/L ±5% of reading @ 25°C
Typical EMC Deviation ±0.01mg/L
Light Source Tungsten lamp
Light Detector Silicon Photocell with narrow band interference filter @ 525 nm
Method Adaptation of the Standard Methods for the Examination of Water and
Wastwater, 18
th edition, calmagite method. The reaction between Ca
and reagents causes a red tint in the sample.
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 102 x 67 mm (7.6 x 4 x 2.6")
Weight 290 g (10 oz.).
REQUIRED REAGENTS
Code
Description Quantity/test
HI 93720A-0 Ca indicator 0.5 mL
HI 93720B-0 Alkali solution 0.5 mL
HI 93720C-0 EGTA solution 1 drop
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
1.50 mg/L calcium hardness and a representative
lot of reagent, an operator obtained with a single
instrument a standard deviation of 0.05 mg/L.