4
5
GENERAL DESCRIPTION
ABBREVIATIONS
SPECIFICATIONS
PRECISION AND ACCURACY
The
HI 96715
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.
The instrument is 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 96715
meter measures the ammonia nitrogen (NH
3
-N) content in water samples in the
0.00 to 9.99 mg/L (ppm) range. The method is an adaptation from ASTM Manual of Water and
Environmental Technology, D1426-93, Nessler Method.
The reagents are liquid form and are supplied in bottles. 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
Light Emitting Diode
Liquid Crystal Display
American Society for Testing and Materilas
°C
:
°F
:
mg/L
:
mL
:
LED
:
LCD
:
ASTM
:
Range
0.00 to 9.99 mg/L (as NH
3
-N)
Resolution
0.01 mg/L for
measurement
0.1 mg/L for
calibration and validation
Accuracy
±0.05 mg/L ±5% of reading @ 25°C
Typical EMC Deviation
±0.01 mg/L
Light Source
Light Emitting Diode
Light Detector
Silicon Photocell with narrow band interference filter @ 466 nm
Method
Adaptation of the ASTM Manual of Water and Environmental Technology,
D1426-93, Nessler Method. The reaction between ammonia and the
reagents causes a yellow 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 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 93715A-0
First Reagent
4 drops (6 drops in seawater)
HI 93715B-0
Second Reagent
4 drops (10 drops in seawater)
Precision
is how closely repeated measurements
agree with each other. Precision is usually
expressed as standard deviation (SD).
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 6.00
mg/L ammonia nitrogen (NH
3
-N) and a
representative lot of reagents, an operator
obtained with a single instrument a standard
deviation of 0.12 mg/L.