Biochrom WPA range of Colorimeters & Spectrophotometers

Biochrom WPA CO7500 Colorimeter

Biochrom WPA CO7500 Colorimeter


  • Single beam filter based colorimeter covering 440-680nm
  • Rugged, portable and easy to use
  • Excellent value for money and ideal for educational applications.
  • Absorbance, %Transmission and simple kinetic measurements
  • Rechargeable battery version available

Biochrom has helped to educate scientists in spectrophotometry for over 30 years. Our Biochrom WPA brand of spectrophotometers and colorimeters are used by schools, colleges and universities worldwide to educate the next generation of scientists.

Designed for science education
The Biochrom WPA CO7500 colorimeter is a value for money instrument that has been designed for use in educational establishments such as schools and colleges. It is compact, lightweight and ergonomically designed to withstand student use! This makes it ideal for use in busy teaching laboratories. The large display is easy to read and the instrument is simple to both set up and use, giving rapid results. The samples can be measured in either standard or semi micro 10mm pathlength cuvettes or in 16mm diameter test tubes (adapters for 10/12 mm test tubes are available). Available in mains only or mains /internal rechargeable NiMH battery versions. 

Measures Absorbance, % Transmission and simple kinetics. When used in kinetics mode - to study rates of reaction, for example - the CO7500 colorimeter takes readings approximately every second and these can be sent to a chart recorder (via the analogue output) if required. Alternatively, the results could be downloaded to an Excel spreadsheet for graphing and other manipulation using the appropriate accessories.

Low maintainance
The CO7500 colorimeter is designed to make life easier for technical staff, and to be low maintainance under demanding conditions. The eight filters (440, 470, 490, 520, 550, 580, 600 and 680nm) are encased in an integral filter wheel so filters cannot be accidentally lost or damaged. With no lid needed, this robust instrument is easy to use, clean and store. There is a drain hole at the bottom of the cell compartment so that spillages do not affect the instrument. Lamp life is extended as it is only on during the measurement cycle. Spare lamps are available and easy to install.

Ordering Information Order Code
Biochrom WPA CO7500 Colorwave Colorimeter (mains only) 80-3000-43
Biochrom WPA CO7500 Colorwave Colorimeter (includes rechargeable battery) 80-3000-44
Spreadsheet interface software (requires serial cable) 80-2112-23
Serial cable 80-3001-00
Adaptor set for 10 and 12mm tubes 80-3000-57

Spare Parts
80-3000-59 Spare lamp, CO 7500L
80-3000-58 Spare filter set, CO 7500F
80-2004-53  Disposable methacrylate cells, 10mm pathlength, volume 2.5ml, pack of 100
80-2084-11  Disposable polystyrene cells, 10mm pathlength, volume 2.5ml, pack of 100
80-3001-25 2 rolls printer paper plus ribbon
80-3001-00 Spare Serial lead

Full technical specifications and a video demonstration of the colorimeter are shown below. Optional accessories marked *

Technical Specifications
Specification Data
Type Visible 
Wavelength Range 440 - 680nm 
Wavelength Accuracy (+/-) n/a 
Wavelength Reproducibility (+/-) n/a 
Lamp Source Tungsten Halogen 
Beam Single Beam 
Optical System Filters 
Bandwidth 40nm 
Detector Diode 
Photometric Range -0.3 to 1.99A, 0-199%T 
Photometric Accuracy <+/- 0.05A at 1A using neutral density filters 
Photometric Reproducibility 0.02A at 1A in 10mm cuvette 
Stray Light <1%T at filter wavelength 
Stability n/a 
Measurement Type Fixed Wavelength (Abs/%T), kinetics 
Cell Compatibility Cuvette 10mm 
Other Sample Containers Test tube * (10, 12, 16mm) 
Cell Holder Single Cell 
Accessory Options Printer* 
Method Storage n/a 
Compliance CE 
Data Output Print*, Export to PC* 
Display LCD 
Data Interface Serial, Analogue 
Languages English, Manuals in French, German, Italian and Spanish 
Power Requirement 110-220V, 50/60Hz, 20VA 
Weight 0.6 Kg (1.2lb) 
Dimensions (WxDxH) 15 x 18 x 6cm (5.9 x 7.1 x 2.4 inches) 
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