Hach-Lange DRB 200 Thermostat - Manual (Page 22)

22
Maintenance
1. Fill a clean, empty vial with glycerol at room
temperature, and insert the thermometer until it
touches the bottom of the vial.
2. When the thermometer is in the vial, the level of the
glycerol must be 5
1 mm ± 0.5 mm from the bottom.
3. Insert the vial in the center opening of the second row
of the test block.
4. Start the temperature program for 150 °C, 60 minutes
(or the COD program) for this block.
5. When the heating phase is complete, the thermometer
temperature should be the same as the temperature
shown on the display.
3.3 Changing the Protective Covers
1. Open the protective cover approximately 45°. Hold the
inside of the external hinge with your thumb.
2. Press your thumb against the inside of the cover.
Carefully lift each side of the cover out of its mounting.
3. Fit a new protective cover by following steps 1-2 in
reverse order.
Figure 5 Changing the Protective Covers