Hanna Instruments HI 96718 - Manual (Page 5)

5
SPECIFICATIONS
PRECISION AND ACCURACY
Range 0.0 to 12.5 mg/L
Resolution 0.1 mg/L
Accuracy ±0.1 mg/L ±5% of reading @ 25°C
Typical EMC Deviation ±0.1 mg/L
Light Source Tungsten lamp
Light Detector Silicon Photocell with narrow band interference filter @ 525nm
Method Adaptation of the Standard Methods for the Examination of Water and
Wastewater, 18
th edition, DPD method. The reaction between iodine
and the reagent causes a pink 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 93718-0 DPD Powder 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 2.5
mg/L iodine and a representative lot of reagent,
an operator obtained with a single instrument a
standard deviation of 0.1 mg/L.