Hanna Instruments HI96709C, Instruction Manual, Page: 6 / 28

6
Precision is how closely repeated measurements
agree with each other. Precision is usually
expressed as standard deviation (SD).
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
10.0 mg/L manganese and a representative lot
of reagent, an operator obtained with a single
instrument a standard deviation of 0.2 mg/L.
SPECIFICA
TIONS
PRECISION AND ACCURACY
Range 0.0 to 20.0 mg/L
Resolution 0.1 mg/L
Accuracy
@25 ºC (77 ºF)
±0.2 mg/L ±3% of reading
Light Source Tungsten lamp
Light Detector Silicon Photocell with narrow band interference filter @525 nm
Method
Adaptation of Standards Methods for the Examination of Water and Wastewater,
18
th
edition, Periodate method. The reaction between manganese and reagents
causes a violet tint in the sample.
Environment 0 to 50 ºC (32 to 122 ºF); max 95% RH non-condensing
Battery Type 9V (1 pc.)
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 320 g (11.3 oz.)
REQUIRED REAGENTS
Code
Description Quantity/test
HI93709A-0 Manganese HR Reagent A 1 packet
HI93709B-0 Manganese HR Reagent B 1 packet