Portable Densitometer DEN-1B
Densitometers are designed for measurement of cell suspension's turbidity in the range:
0.0–6.0 McFarland units (0–180 × 107 cells/ml)
However, it is necessary to remember that in this case the standard deviation values increase.
Calibration
The unit is calibrated at the factory (for operation with 18 mm diameter glass tubes) and keeps calibration without power supply.
However, if necessary it is possible to calibrate the unit by 2–6 points in 0.0–6.0 McFarland unit range.
Both commercial standards (e.g. produced by BioMerieux, Lachema, etc.) and the cell suspensions prepared in a laboratory can be used for calibration
| Order No. DEN-1B | 103.3505 |
| Light source | LED |
| Measurement wavelength (λ) | λ = 565 ±15 nm |
| Measurement range | 0.00–15.00 McF |
| Display resolution | 0.01 McF |
| Accuracy, of the full scale | ±3% |
| Measurement time | 1 s |
| Sample volume | not less than 2 ml |
| Tube external diameter | 18 mm (without adapter) or 16 mm (using optional A-16 adapter) |
| Possibility to restore factory calibration settings | + |
| Display | LCD |
| Overall dimensions (W×D×H) | 165 × 115 × 75 mm |
| Weight | 0.7 kg |
| Independent power supply | 3 × AA batteries |
| Input current/power consumption | 12 V, 7 mA / 0.1 W |
| External power supply | Input AC 100–240 V, 50/60 Hz; Output DC 12 V |
| Standard set | External power supply and 3 × AA batteries |
Can I use tubes of different diameter?
Yes. Glass and transparent plastic tubes (16 or 18 mm in external diameter) can be used for work with DEN-1 densitometer. A-16 adapter (included) must be used for work with tubes which are 16 mm in external diameter.
Note! The unit must be calibrated every time a tube type (e.g. with different ext. diameter, bottom shape or different material) is changed.
Can standards prepared in the laboratory be used for calibration?
Yes. Both commercial standards and standards prepared in the laboratory can be used for calibration.
For what type of tubes is DEN-1/DEN-1B precalibrated at the factory?
From December 2015 factory calibration is for work with glass tubes with an external dimeter of 16 mm.
How to caibrate DEN-1/DEN-1B?
Calibration procedure is described in the user manual p.3.4.
How to restore factory calibration settings?
Procedure of restoration of factory calibration settings is described in the user manual p 3.5.
