Double Beam Microprocessor UV-VIS Spectrophotometer 2904


Double Beam Microprocessor UV-VIS 

Spectrophotometer 2904 (Variable Bandwidth) 

(Eight Cell Holder With Peltier Temperature

Controller and Sipper System)

(Original / premium with Japanese Technology)

DOUBLE BEAM UV-VIS Spectrophotometer with more accuracy and flexible requirements. The two detectors are used 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.


Technical Specification:

Optical system:

Double Beam ( 1200 Lines/nm Grating )

Wavelength range:

190 nm-1100nm


Basic/Quantitative/Wavelength scan

Scanning Speed :

Fast /Medium / low

Wavelength accuracy:

+-0.3 nm


0.5 / 1.0 /  2.0/ 4.0

Wavelength repeatability:

0.2 nm

Photometric accuracy:


Photometric repeatability:


Photometric Display range:

0-200% t, -0.3 -3.0A, 0 – 9999 C


±0.001A/h @500nm

Baseline Flatness:

±0.001 A


±0.001 A

Stray Light :

< 0.05%@220nm&360nm

Data Output Port:


Printer Port :

Parallel Port

Display :

Graphic LCD (  320×240 Dots )


Deuterium Lamp & Tungsten Halogen Lamp


Silicon Photodiode

Packing Dimension :

625*430*206mm (L*B*H)


26 kg


Technical specification of peltier/sipper system

1. The valid temperature range is from 15º to 65º

2. The valid sampling time range is from 30s to 10min,

3. The valid peristaltic pump speed range is from 1 to 12

4. The sampling speed is about 50ml/min.

5. Power supply is 220±22V@50±1Hz or 110±11V@60±1Hz.



1) Control Unit.

2) Cell holder with Peltier System. (It’s already pre-loaded into the compartment of the spectrophotometer).

3) Control Cable (to connect the Control Unit with the Cell holder with Peltier System).

4) Peristaltic pump pipe. (It’s already pre-loaded into the pump valve of the Control Unit)

5) Power cord.



Wide Wavelength range, satisfying requirements various fields.

Fully automated design, realizing the simplest measurement & satisfying the requirement of pharmacopeia

Maximum of 9 Wavelength & 8 Sample can be measured at one time

Automatic change –over Between W 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 method and triple-wavelength methods etc, meet difference measurement requirement 

Automatic 10 mm 8 –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



* Medicine/Pharmaceutical Industry

* Environmental Monitoring

* Commodity Inspection

* Food Inspection

* Agricultural Chemistry

* Teaching in Colleges & Universities

* Metallurgy

* Geology

* Machine Manufacturing

* Petrochemical Industries

* Water and Waste Water Labs

* Food and Beverage Labs


Standard Configuration

* Glass Cell : 4 nos.

* Quartz cells : 2 nos.

* Instruments Cover : 1 no.

* Software CD : 1 no.

* USB Cable : 1 no.

* Operational Manual : 1no.

* Software Manual : 1 no.

* Software key : 1no.


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
3. 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.

±0.002 A