Microprocessor Double Beam UV-VIS spectrophotometer LI- 2700 ( Two Cell Holder)


Silent Features

* Wide Wavelength range, satisfying requirements of various fields.

* Fully automated design, realizing the simplest measurement & satisfying the requirement of pharmacopoeia.

* Maximum of 9 Wavelength & 1 sample can be measured at one time.

* Automatic change-over between T lamp & D2 lamp.

* Optimized optics and large scale integrated circuits design, light source and receiver from world famous measurement methods all add up to high performance and reliability.

* Rich measurement methods: wavelength scan, time scan multi-wavelength determination, multi-order derivative determination, double-wavelength methods and triple-wavelength methods etc, meet difference measurement requirement.

* 10mm,  2-cell holder.

* Data Output can be obtained via a printer port and a USB interface.

* Parameters and data can be saved for user's convenience.

* PC controller measurement can be achieved for more accurate and flexible requirement.


DOUBLE  BEAM UV-VIS Spectrophotometer with more accuracy and flexible requirements. The two detectors are used to measure sample and reference respectively and simultaneously for optimizing measurement accuracy. It has wide wavelength range satisfying requirement of various fields, such as biochemical research and industry, pharmaceuticals analysis and production, education, environment protection, food industry etc.

Basic Mode

To measure the Absorbance and transmittance 


  1. Coefficient Method
  2. Standard Curve Up to 10 Standard sample may be used to establish a Curve.  Four methods for fitting a curve through the calibration points : Linear fit. Linear fit through zero, Square fit and cubic fit. 

DNA/Protein Test

Concentration and DNA purity are quickly and easily calculated: Absorbance

Rations : 260 nm / 280 nm with optional subtracted absorbance at 320 nm. DNA

Concentration = 62.9XA260-36.0XA280 Protein concentration = 1552xA260-757.3xA 280

Wavelength Scan

  1. The wavelength scan intervals are 0.1,0.2,0.5,1,2,5 nm
  2. Hi, Medium and low scan speed are available. They vary from 100 to 3600 nm/min
  1. Wavelength are scanned from high to low so that the instrument waits at high WL. And it minimizes the degradation of UV sensitive samples.


This mode may be used for time course scanning or reaction rate calculations.

Abs v/s time graphs is displayed on the screen in real time, Wait time and measurement time up to 12 hours may be entered with time interval of 0.5,1,2,5,10,30 seconds and one min. Post-run manipulation includes re-scaling, curve tracking and selection of the part of the curve required for rate calculation. Rate is calculated using a linear regression algorithm before multiplying be the entered factor.