General Catalogue Chemistry - BECO Internacional LTDA.

667 349
photometry
Determination of the absorption characteristic
of an untreated chlorophyll solution
By simple means it is possible to produce an
alcohol extract from crushed leaves. This untreated
chlorophyll solution may then be subjected to
photometric analysis.
With the aid of the digital spectrophotometer
(> 667 349) it is possible to record a continuous
absorption spectrum; in spite of the presence
of contamination the existence of absorption
peaks in the blue and red ranges can be
detected.
Equipment list
60 LEYBOLD DIDACTIC · GENERAL CATALOGUE CHEMISTRY
667 352
Determination of the absorption characteristic
of an untreated chlorophyll solution
Quantity Description Cat. No.
1 Digital spectral photometer . . .667 349
1 Computer connection cable
with software . . . . . . . . . . . . . .667 352
1 Personal computer
667 349
Digital spectral photometer
The digital spectral photometer is an economical,
easy-to-operate single beam photometer.
The digital display allows the simultaneous indication
of transmission and absorption or concentration
and factor.
The wavelength can also be indicated in both
cases.The filter wheel contains 4 filters each of
which covers a different range of wavelengths.
Specific wavelengths are selected manually
after the appropriate filter has been positioned
in the beam.
The integrated interface allows connection to
the RS 232 interface of a computer. The software
which is accompanying the computer
connection cable (> 667 352 ) allows the
recording of the absorption as a factor of the
concentration, time or wavelength.
The function of a large digital display can be
called up on the monitor.
Wavelength range: 340...900 nm
Resolution: 2.5 nm
Wavelength accuracy: ± 1.0 nm
Photometric stability: ± 0.1 %T
Photometric linearity: ± 0.1 %T
Measurement ranges:
Transmission: 0...100 %
Absorption: 0...1.999
Concentration: 0...199
Factor: 0.1...999
Display:
LED, 4-digit, 7 mm high
Cells:
Round cells,
15 mm external diameter,
100 mm high
Cell holder: 15 mm
Data output: Serial, 9-pin
Voltage supply:
115/230V, 50/60 Hz, switchable
Dimensions: 410 x 210 x 220 mm
Weight: 5.8 kg
Scope of delivery
1 Digital spectral photometer,
including RS 232 interface
2 Round cells
667 352
Computer connection cable
This cable allows the digital spectral photometer
(> 667 349 ) to be connected directly to
the serial interface of a computer. DOS software
is also included in the scope of supply