Hanna Instruments HI 95761 - Manual (Page 5)

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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 with narrow band interference filter @ 525 nm
Light Detector Silicon Photocell
Method Adaptation of the USEPA METHOD 330.5. 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.
Dimensions 180 x 83 x 46 mm (7.1 x 3.3 x 1.8")
Weight 290 g (10 oz.).
REQUIRED REAGENTS
Code
Description Quantity/test
HI 95761-0 Total Chlorine LR Reagent 1 packet
SPECIFICATIONS
PRECISION AND ACCURACY
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.
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CALIBRATION PROCEDURE
• Turn the meter on by pressing ON/OFF.
• When the LCD displays “761”, it is ready.
• Enter the calibration mode by holding CAL CHECK
for three seconds.
• The date of the last calibration appears (e.g.:
month “01”, day “08”). “F.CAL” means that
the factory calibration is selected.
Note: at this point it is possible to reset the
instrument to restore FACTORY CALIBRATION,
see instructions page 18.
• Place the CAL CHECK™ Standard Cuvet A into
the holder and ensure that the notch on the cap
is positioned securely into the groove.
• Press ZERO and “SIP” will blink on the display.
• After a few seconds the display will show
“-0.0-”. The meter is now zeroed and ready for
calibration.
• Remove the cuvet.
• Place the CAL CHECK™ Standard HI 95761-11
Cuvet B into the holder and ensure that the
notch on the cap is positioned securely into the
groove.
Note: it is possible to interrupt calibration procedure at any time by pressing ON/OFF.
Warning: do not validate or calibrate the instrument with standard solutions other than the Hanna
CAL CHECK™ Standards, otherwise erroneous results will be obtained.
or
CALIBRATION PROCEDURE