5
SPECIFICATIONS
PRECISION AND ACCURACY
Range
0.000 to 0.500 mg/L
Resolution
0.001 mg/L
Precision
±0.004 mg/L @ 0.200 mg/L
Typical EMC Deviation
±0.001 mg/L
Light Source
Tungsten lamp
Light Detector
Silicon Photocell with narrow band interference filter @ 525 nm
Method
Adaptation of the Standard Method 4500-Cl G. The reaction between
the chlorine and the DPD reagent 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 95761-0
DPD Powder Reagent
1 packet
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 0.200
mg/L chlorine and a representative lot of reagent,
an operator obtained with a single instrument a
standard deviation of 0.004 mg/L.