Hanna Instruments HI 96731 - Manual (Page 5)

5
SPECIFICATIONS
PRECISION AND ACCURACY
Range 0.00 to 3.00 mg/L
Resolution 0.01 m/L
Accuracy ±0.03 m/L ± 3% of reading @ 25°C
Typical EMC Deviation ±0.01 mg/L
Light Source Tungsten lamp
Light Detector Silicon Photocell with narrow band interference filter @ 575nm
Method Adaptation of the Standard Methods for the Examination of Water and
Wastewater, 20
th edition, Zincon method. The reaction between zinc
and the reagent causes a brownish-green to a blue 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 93731A-0 Reagent A 1 packet
HI 93731B-0 Reagent B Cyclohexanone 0.5 mL
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
300 mg/L zinc and a representative lot of reagent,
an operator obtained with a single instrument a
standard deviation of 4 mg/L.