Hanna Instruments hi 95761 ユーザーズマニュアル
5
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.
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.
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
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
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 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
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.
lot of reagent, an operator obtained with a
single instrument a standard deviation of
0.004 mg/L.
16
CALIBRATION PROCEDURE
• Turn the meter on by pressing ON/OFF.
• When the LCD displays “761”, it is ready.
• 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
the factory calibration is selected.
Note: at this point it is possible to reset the
instrument to restore FACTORY CALIBRATION,
see instructions page 18.
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.
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
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.
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