Download Mantis 5000 Specifications

Introduction
The traditional use of the spectrophotometer is to measure the absorbance or transmission
of a clear or translucent liquid or solid. Typically UV/VIS/NIR spectroscopy applications
include reaction kinetics, quantitative analysis or the identification of the chemical
constituents in a substance. The measurement of reflectance offers an added dimension to
the spectroscopy capabilities of your spectrophotometer, the analysis is no longer limited
to the portion of the beam that penetrates the sample. Accordingly, the analysis is no
longer limited to samples that are clear or translucent. The DRA provides the means of
measuring absorbance or transmission of opaque, turbid and reflecting substances.
Figure 1. The external DRA.
Figure 2. The external DRA viewed from
the back.
There are three versions of the diffuse reflectance accessory that operate over different
wavelength ranges.These are specified below. While all of the following variations are
available, the configurations indicated by ticks in the table below offer optimal operation.
(External DRA
900)
(External DRA
1800)
(External DRA
2500)
Cary
4000
Cary
5000
Cary
6000i
The Varian 900, 1800, 2500 External Diffuse Reflectance accessory (DRA) consists of a
150 mm diameter integrating sphere. The sphere is easily installed in the sample
compartment of the instrument and features an inbuilt high performance photomultiplier
tube (PMT). The DRA also has a Lead Sulfide (PbS) or InGaAs detectors which become
active Varian 2500 External DRA. The coating is Polytetrafluoroethylene (PTFE), which