Hanna Instruments HI 96724C - Manual (Page 5)

5
SPECIFICATIONS
PRECISION AND ACCURACY
Range 0.00 to 5.00 mg/L of Cl
2
(Free or Total)
Resolution 0.01 mg/L from 0.00 to 3.50 mg/L; 0.10 mg/L above 3.50 mg/L
Accuracy ±0.03 mg/L ±3% of reading @ 25°C
Typical EMC Deviation ±0.01 mg/L
Light Source Tungsten lamp
Light Detector Silicon Photocell with narrow band interference filter @ 525 nm
Method Adaptation of the USEPA method 330.5 and Standard Method 4500-Cl G.
The reaction between chlorine and the reagents 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 93701A-T DPD1 Indicator 3 drops
HI 93701B-T DPD1 Buffer 3 drops
HI 93701C-T DPD3 Solution 3 drops
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 chlorine and a representative lot of reagents,
an operator obtained with a single instrument a
standard deviation of 0.03 mg/L.