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.