Hanna Instruments HI 95715 - Manual (Page 5)

5
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
Precision ±0.12 mg/L @ 6.00 mg/L
Typical EMC Deviation ±0.01 mg/L
Light Source Light Emitting Diode with narrow band interference filter @ 466 nm
Light Detector Silicon Photocell
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.
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/test
HI 93715A-0 First Reagent 4 drops (6 drops in seawater)
HI 93715B-0 Second Reagent 4 drops (10 drops in seawater)
SPECIFICATIONS
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.
PRECISION AND ACCURACY