4
The
HI 95761
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 waterproof 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 95761
portable meter measures the total chlorine (Cl
2
) content in water samples in the
0.000 to 0.500 mg/L (ppm) range. The method is an adaption of the USEPA METHOD 330.5 for
wastewater.
The reagent is in
powder form and is supplied in packets. The amount of reagent is precisely dosed
to ensure the maximum repeatability.
GENERAL DESCRIPTION
degree Celsius
US Environmental Protection Agency
degree Fahrenheit
milligrams per liter. mg/L is equivalent to ppm (part per million)
milliliter
°C
:
EPA
:
°F
:
mg/L
:
mL
:
ABBREVIATIONS
17
or
• Press READ/TIMER and “SIP” will blink during
measurement.
• The instrument will show for three seconds the
CAL CHECK™ standard value.
Then the date of last calibration (e.g.: “01.08”)
appears on the display, or “01.01” if the factory
calibration was selected. In both cases the
number of the month is blinking, ready for date
input.
Note
: if the display shows “ERR” the calibration
procedure failed. Verify that both CAL CHECK™
Standards HI 95761-11 Cuvets,
A
and
B
, are
free from fingerprints or dirt and that they are
inserted correctly.
DATE INPUT
• Keep READ/TIMER pressed to scroll to the desired
month number (01-12).
• When the correct month has been set, press
ZERO to confirm. Now the display will show the
day number blinking. Keep READ/TIMER pressed
to scroll to the desired day number (01-31).
Note
: it is possible to change from
day
to
month
and vice versa by pressing ZERO.
• When both the day and month have been
selected, hold CAL CHECK for three seconds to
store date and calibration values. The instrument
will show for one second “Stor”, to confirm that
the new calibration data has been accepted.
• The instrument will return automatically to the
measurement mode by displaying "761" on
the LCD.