5
Given that the absorption of a compound strictly depends on the
wavelength of the incident light beam, a narrow spectral bandwidth
should be selected as well as a proper central wavelength to optimize
measurements.
The optical system of Hanna's HI 83000 multiparameter photometers
is based on special subminiature tungsten lamps and narrow-band
interference filters to guarantee both high performance and reliable
results.
Four measuring channels (at four different wavelengths) allow a wide
range of tests.
HI 83000 Block diagram (optical layout)
A microprocessor controlled special tungsten lamp emits radiation
which is first optically conditioned and beamed to the sample con-
tained in the cuvet. The optical path is fixed by the diameter of the
cuvet. Then the light is spectrally filtered to a narrow spectral band-
width, to obtain a light beam of intensity
I
o
or
I
.
The photoelectric cell collects the radiation
I
that is not absorbed by
the sample and converts it into an electric current, producing a poten-
tial in the mV range.
The microprocessor uses this potential to convert the incoming value
into the desired measuring unit and to display it on the LCD.
The measurement process is carried out in two phases: first the meter
is zeroed and then the actual measurement is performed.
The cuvet has a very important role because it is an optical element
and thus requires particular attention. It is important that both the
measurement and the calibration (zeroing) cuvets are optically identi-
cal to provide the same measurement conditions. Whenever possible
use the same cuvet for both.
It is also necessary that the surface of the cuvet is clean and not
scratched. This is to avoid measurement interference due to unwanted
reflection and absorption of light. It is recommended not to touch the
cuvet walls with hands.
Furthermore, in order to maintain the same conditions during the
zeroing and the measuring phases, it is necessary to close the cuvet to
prevent any contamination.
48
REAGENT SETS
HI 93706-01
100 Phosphorus tests
HI 93706-03
300 Phosphorus tests
HI 93715-01
100 Ammonia tests
HI 93715-03
300 Ammonia tests
HI 93728-01
100 Nitrate tests
HI 93728-03
300 Nitrate tests
HI 93750-01
100 Potassium tests
HI 93750-03
300 Potassium tests
OTHER ACCESSORIES
HI 721310
9V battery (10 pcs)
HI 731318
Tissue for wiping cuvets (4 pcs)
HI 731321
Glass cuvets (4 pcs)
HI 731325N
New cap for cuvet (4 pcs)
HI 740034
Cap for 100 mL beaker (6 pcs)
HI 740036
100 mL plastic beaker (6 pcs)
HI 740157
Plastic refilling pipette (20 pcs)
HI 92000
Windows
®
Compatible Software
HI 920010
PC connection cable
HI 93703-50
Cuvets cleaning solution (230 mL)
HI 740223
170 mL plastic beaker
HI 740224
170 mL plastic beakers (12 pcs)
HI 740225
60 mL graduated syringe
HI 740226
5 mL graduated syringe
HI 740227
Filter assembly
HI 740228
Filter discs (25 pcs)
HI 740229
100 mL Polypropylene cylinder
HI 740230
230 mL Demineralized water
HI 93703-54
Dried resin (100 g)
HI 93703-55
Activated Carbon (50 pcs)
ACCESSORIES
