Hach-Lange DRB 200 Thermostat - Manual (Page 21)

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Section 3 Maintenance
There are no scheduled maintenance requirements for the
instrument. To ensure reliable and precise operation, it
must be kept clean.
3.1 Cleaning the Instrument
DANGER
Strong acids and
bases can cause
burns.
1. Switch off the instrument, unplug the power cord and
allow the instrument to cool.
2. Wipe the instrument with a soft, damp cloth. Make
sure no water penetrates into the instrument.
If a vial overflows or breaks, or a small amount of liquid is
spilled, proceed as follows:
1. Switch off the instrument, unplug the power cord and
allow the instrument to cool.
2. Draw off the liquid with a pipette, avoiding any
contact with the skin.
3. Transfer liquid residues to a proper disposal.
4. Remove broken glass with tweezers and wipe out any
remaining liquid, avoiding any contact with the skin.
3.2 Instrument Test
The temperature shown in the display corresponds to the
temperature in a closed HACH vial filled with an aqueous
medium. During the heating phase, the real block
temperature in the vicinity of the heater may be higher
than the temperature shown on the display.
An empty Hach vial, glycerol (approximately 5 mL), and a
calibration stem-type thermometer (95–1
55 °C) are needed
to check the block temperature.