4
Light Life
Life of the instrument
Light Detector
Silicon Photocell
Environment
0 to 50°C (32 to 122°F);
max 95% RH non-condensing
Power Supply
2x 9 V batteries / 12 to 20 VDC through voltage
adapter
Auto-Shut off
After 10' of non-use
Dimensions
230 x 165 x 70 mm (9.0 x 6.5 x 2.8")
Weight
640 g (22.6 oz.)
For specifications related to each single parameter (e.g. range, accu-
racy, etc.), refer to the related measurement section.
Absorption of Light is a typical phenomenon of interaction between
Electromagnetic Radiation and Matter. When a light beam crosses a
substance, some of the radiation may be absorbed by atoms, mol-
ecules or crystal lattices.
If pure absorption occurs, the fraction of light absorbed depends both
on the optical path length through the matter and on the physico-
chemical characteristics of substance according to the Lambert-Beer
Law:
-log
I
/
I
o
ε
λ
c d
or
A
ε
λ
c d
Where:
-log
I
/
I
o
= Absorbance (A)
I
o
= intensity of incident light beam
I
= intensity of light beam after absorption
ε
λ
= molar extinction coefficient at wavelength
λ
c = molar concentration of the substance
d = optical path through the substance
Therefore, the concentration "c" can be calculated from the absorbance
of the substance as the other factors are known.
Photometric chemical analysis is based on the possibility to develop
an absorbing compound from a specific chemical reaction between
sample and reagents.
SPECIFICATIONS
PRINCIPLE OF OPERATION
49
All Hanna Instruments meters are warranted for two years
against
defects in workmanship and materials when used for their intended
purpose and maintained according to instructions.
This warranty is limited to repair or replacement free of charge
.
Damages due to accidents, misuse, tampering or lack of prescribed
maintenance are not covered.
If service is required, contact the dealer from whom you purchased the
instrument. If under warranty, report the model number, date of
purchase, serial number and the nature of the failure. If the repair is
not covered by the warranty, you will be notified of the charges
incurred.
If the instrument is to be returned to Hanna Instruments, first obtain a
Returned Goods Authorization Number from the Customer Service
department and then send it with shipment costs prepaid. When
shipping any instrument, make sure it is properly packaged for com-
plete protection.
To validate your warranty, fill out and return the enclosed warranty
card within 14 days from the date of purchase.
Hanna Instruments reserves the right to modify the design, construc-
tion and appearance of its products without advance notice.
WARRANTY
