4. Operation of DEN-1
Recommendation during operation
Keeping the unit switched on for 15 min before starting the operation for the operation mode,
stabilisation is recommended.
If flat-bottomed tubes are used, the solution level should be higher than 7 mm from a tube bottom;
if round-bottomed tubes are used, the level should be higher than 12 mm from a tube bottom.
4.1.
Connect the external power supply unit to electric circuit.
4.2.
Switch ON the unit using the Power switch (Fig.1/
u
) on the rear panel (position I).
4.3.
The following indication may be shown on the display (fig.2/
v
):
“0.0” means that the unit is calibrated and ready for operation (if no any tube inserted);
“CC” (flashing) means that the unit is not calibrated. Calibrate the unit.
“EE” means that operator error message. Switch OFF the unit and then switch ON again.
4.4.
Shake the tube with the solution (it is recommended to use a vortex mixer, e.g. Vortexer PV-1, for
shaking) and insert it into the socket (fig.2/
u
). The McFarland value for the solution will be
shown on the display (fig.2/
v
).
4.5. Glass and transparent plastic tubes (16 or 18 mm in external diameter) can be used for work with
DEN-1 densitometer. An adapter must be used for work with tubes which are 16 mm in external
diameter.
Note!
The unit must be calibrated each time a tube type (e.g. with different outer diameter,
bottom shape or different material [transparent plastic tubes]) is changed.
4.6.
After finishing the operation switch OFF the unit using the Power switch (position O). Disconnect
the power supply from electric circuit.
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Fig.2 Front panel
Page 7
DEN-1
Operating instructions
Version 1.03 - July 2013
