Hanna Instruments HI 96750 - Manual (Page 5)

5
SPECIFICATIONS
PRECISION AND ACCURACY
Range 0.0 to 10.0 mg/L LR
10 to 100 mg/L MR
Resolution 0.1 mg/L LR
1 mg/L MR
Accuracy LR: ±1.5 mg/L ±7% of reading @ 25°C
MR: ±15 mg/L ±7% of reading @ 25°C
(excluding dilution error)
Typical EMC Deviation ±0.1 mg/L LR
±1 mg/L MR
Light Source Light Emitting Diode
Light Detector Silicon Photocell with narrow band interference filter @ 466nm
Method Tetraphenylborate Method. The reaction between potassium and re-
agents causes turbidity 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 93750A-0 Potassium Reagent 6 drops
HI 93750B-0 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 2.00
mg/L potassium and a representative lot of
reagent, an operator obtained with a single
instrument a standard deviation of 0.06 mg/L.