Hanna Instruments HI 95725C - Manual (Page 3)

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The HI 95725 is an auto diagnostic portable microprocessor meter that benefits from Hanna’s
years of experience as a manufacturer of analytical instruments. It has the advanced optical
system based on a special tungsten lamp and a narrow band interference filter that allows most
accurate and repeatable readings. All instruments are factory calibrated and the electronic and
optical design minimizes the need of frequent calibration.
With the powerful
CAL CHECK™ validation function you are able to validate good performance
of your instrument at any time. The validation procedure is extremely user friendly. Just use the
exclusive Hanna ready-made, Nist traceable standards to verify the performance of the instrument
and recalibrate if necessary.
All instruments are splash proof and the lamp and filter units are protected from dust or dirt by
a transparent cup. This makes the instruments fulfill field applications. Display codes aid the
user in routine operation. The meter has an auto-shut off feature that will turn off the instrument
after 10 minutes of non use or after 1 hour if left in the
calibration mode.
The meter uses an exclusive positive-locking system to ensure that the cuvet is in the same
position every time it is placed into the measurement cell. It is designed to fit a cuvet with a
larger neck making it easier to add both sample and reagents. The cuvet is made from special
optical glass to obtain best results.
The
HI 95725 meter measures the free and total chlorine (Cl
2
), the cyanuric acid and the pH in
water samples.
The liquid reagents are supplied in dropper bottles and the powder reagent in easy to handle
powder packets. The amount of reagent is precisely dosed to ensure the maximum repeatability.
°C: degree Celsius
USEPA: US Environmental Protection Agency
°F: degree Fahrenheit
mg/L: milligrams per liter. mg/L is equivalent to ppm (part per million)
mL: milliliter
Light Source Tungsten lamp with narrow band interference filter @ 525 nm.
Light Detector Silicon Photocell
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.)
For specifications related to each single parameter (e.g. range, accuracy, etc.), refer to the
related measurement section.
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
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.
GENERAL DESCRIPTION
ABBREVIATIONS
PRECISION AND ACCURACY
SPECIFICATIONS