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6. Calibration
6.1. The unit is pre-calibrated at the factory for operation with the glass tubes 16 mm in
external diameter (see the label on the bottom side of the unit, fig. 1/1) at temperature
range from +15°C to +25°C and saves calibration data when being switched off. To
use different types of tubes, recalibrate the unit as shown below.
6.2. Before using the standards, prepare them by the instructions from the manufacturer.
6.3. Perform calibration from lower to higher calibration value. Use at least 2 points for
calibration. Different calibration points are available: 0.00, 0.50, 1.00, 2.00, 3.00, 4.00,
5.00, 6.00.
6.4. Connect the external power supply to electric circuit. Switch on the unit using the
Power switch (fig. 3/1) on the rear panel.
DEN-1B can operate without external power supply on battery power.
Make sure that the tube socket is empty. For Ø12 mm or Ø16 mm tubes,
place the A-12 or A-16 adapters, accordingly.
6.5. Press the Select button (fig. 3/3) on the rear of the unit.
Use a thin pin of maximum diameter of 2 mm for pressing the Select and
Install buttons.
6.6. It is necessary to set values for an empty socket . and transparent standard . .
6.6.1. Empty socket. Display shows . indication. Press Install button (fig. 3/4) to save
empty socket value. Display shows next required calibration value.
6.6.2. Transparent standard. Display shows . indication. Insert standard for 0.00 value
into the socket (fig. 2/1) of the unit. If the standard for 0.00 value is not available, fill
the tube (of the kind that is used for operations) with distilled water. Use the tube as
the 0.00 value standard. Press Install button to save transparent standard value.
Display shows next required calibration value.
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