Summary
Series 2000 colorimeters are high performance instruments. Excellent
detection at low concentration is possible with flow cells of
up to 50mm path length. A full range of high quality filters
from 340nm to 880nm are stocked. Signal damping, sensitivity
control and zeroing make for simple and reliable operation. 1
to 6 channel instruments cover the range of Burkard flow analysers.
Visible and UV models are available.
Product Details
The CFX & CFX-UV colorimeters are designed for use with
continuous flow and flow injection analysers. A key benefit of
the CFX & CFX-UV colorimeters is the simple operating design
providing easy access to flowcells, filters and lamp. The single
lamp design and direct light path (no fiberoptic light conductors)
provides a highly efficient system with minimal heat generation
and lower maintenance requirements. The unit is expandable from
1 to 4 channels of detection while the footprint remains one
of the smallest of any continuous flow laboratory colorimeter.
The colorimeter also offers the option for sample blanking capability
through specially modified interchangeable flowcell blocks.
The colorimeter is fitted with flow-through cells with path
lengths of 10-50mm. Light from a quartz-halogen lamp (deuterium
CFX-UV) is passed through a narrow band interference filter to
select the appropriate wavelength. The light beam then passes
through each flow cell to a pair of detectors. A reference beam
falls upon the second detector to compensate for any variation
in output from the lamp. A light metering screw shutter allows
the reference beam to be attenuated to balance the output from
the two detectors to give a zero voltage analogue baseline signal
for a recorder or data handling system. For noisy signals, or
irregular baseline effects, a damping circuit provides a smoothed
output. Signal damping is activated on a per channel basis by
a switch conveniently situated within the flow cell compartment.
The read/zero switch located on the front panel allows the recorder
zero position to be verified. In the zero position the output
is zero volts so that the position of the recorder pen may be
adjusted by the recorder zero control. In the read position the
normal analogue signal is output to the recorder.
The sensitivity of the colorimeter may be varied by a setting
control that amplifies the output signal. The control is operated
by a ten-turn vernier potentiometer situated on the front panel.
The analogue out level is controlled by this potentiometer, the
higher, the vernier setting, the greater is the expansion of
the signal. This allows the adjustment of the analogue out to
attain full peak height on any given channel.
The unit has a mains on/off rocker switch situated on the back
panel with a neon light on the front panel to confirm that the
instrument is switched on. The CFX-UV also has two additional
lamps to indicate the status of the deuterium lamp.
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