Hanna Instruments HI 96719 - Manual (Page 5)

5
SPECIFICATIONS
PRECISION AND ACCURACY
Range 0.00 to 2.00 mg/L
Resolution 0.01 mg/L
Accuracy ±0.11 mg/L ±5% of reading @ 25°C
Typical EMC Deviation ±0.02 mg/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 , EDTA colorimetric method. The reaction
between Mg and reagents causes a violet 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 93719A-0 Mg indicator 0.5 mL
HI 93719B-0 Alkali solution 0.5 mL
HI 93719C-0 EDTA solution 1 drop
HI 96719D-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 1.00
mg/L magensium hardness and a representative
lot of reagent, an operator obtained with a single
instrument a standard deviation of 0.03 mg/L.