Biochrom WPA range of Colorimeters & Spectrophotometers

Biochrom WPA CO8000 Cell density meter

Biochrom WPA CO8000 Cell density meter


  • Single beam LED cell density meter measures OD at 600nm
  • Small, portable with rechargeable battery
  • Long lifetime LED source with little maintenance needed
  • Easy to use, clean and sterilise
  • Stores up to 99 results to download later

The Biochrom WPA CO8000 is a robust, easy to use instrument dedicated to the measuring of the density of cells in suspension such as E.coli, yeast, cells and other cell cultures. This hand held instrument has an integral battery allowing it to be taken to where the cell cultures are growing e.g. in incubation cabinets, under anaerobic conditions or even in a fume hood or safety cabinets.

This robust instrument will accept a variety of cuvettes and tubes- including 10, 12, and 16mm diameter test tubes meaning it can be used with Erlenmeyer side arm flasks. With no warm up time, just switch it on and it’s ready to use giving you results that are comparable to larger, more expensive spectrophotometers. The cell density of the cultures can be measured and the results stored in the memory. The results are given in Absorbance Units (OD). Once all measurements are taken, the up to 99 sample results can be viewed on the easy to read screen or the instrument can be connected to a PC or printer and the results downloaded.

This low maintenance instrument uses an indefinite life LED with fibre optics and no filters. The rechargable battery automatically recharges when connected to the mains and allows up to 1 month's normal use (under normal conditions) on a single charge. It is easily cleaned with ethanol or sterilized with formaldehyde or ethylene oxide.

It is important to note that cell cultures are turbid samples , so the Absorbance (OD) measured is due to light scattering, and not due to molecular absorption. Clumping together of cells will also affect readings, so the medium they are suspended in will also make a difference. This means that the actual reading obtained is very dependent on the collecting area of the detector after the sample and the optical geometry of the system. These vary depending on the make and model of instrument, so differences in readings between types of instruments are to be expected.

To use this instrument with cells other than yeast or E.coli known concentrations / cell counts (with replicates to gauge error limits) should be plotted against measured OD600 to construct a calibration curve.

Ordering Information Order Code
Biochrom WPA CO8000 Cell Density Meter 80-3000-45
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
80-2004-53  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

Technical Specification shown below. Optional accessories shown marked *.

Technical Specifications
Specification Data
Type Visible 
Wavelength Range 600nm 
Wavelength Accuracy (+/-) n/a 
Wavelength Reproducibility (+/-) n/a 
Lamp Source LED 
Beam Single Beam 
Optical System LED 
Bandwidth 40nm 
Detector Diode 
Photometric Range -0.3 to 1.99A 
Photometric Accuracy +/- 0.02A at 1A 
Photometric Reproducibility 0.02A at 1A in 10mm cuvette 
Stray Light <1%T 
Stability n/a 
Measurement Type Cell Density 
Cell Compatibility Cuvette 10mm 
Other Sample Containers Test tube * (10, 12, 16mm) 
Cell Holder Single Cell 
Accessory Options Rechargeable battery included 
Method Storage None 
Compliance CE 
Data Output Print*, Store*, Export to PC* 
Display LCD 
Data Interface Serial 
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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