Maintenance; Clean The Instrument; Measure The Temperature Of The Heating Block - Hach LT 200 Manual Del Usuario

Maintenance

C A U T I O N
Multiple hazards. Only qualified personnel must conduct the tasks
described in this section of the document.
N O T I C E
Do not disassemble the instrument for maintenance. If the internal components
must be cleaned or repaired, contact the manufacturer.

Clean the instrument

Keep the instrument clean to get continuous and accurate operation.
C A U T I O N
Fire hazard. Do not use flammable agents to clean the instrument.
C A U T I O N
Burn hazard. Do not clean the instrument when it is hot.
N O T I C E
To prevent instrument damage, do not use cleaning agents such as turpentine,
acetone or similar products to clean the instrument including the display.
1. Turn the instrument off and disconnect the power cord.
2. When the instrument is cool, clean the surface of the instrument with
a soft, moist cloth and a weak soap solution. Make sure that no water
gets into the instrument.
If the liquid in a sample cell spills or a sample cell breaks:
1. Turn the instrument off and disconnect the power cord.
2. Let the temperature of the heating block(s) and sample cells
decrease until cool.
3. Remove the liquid with a pipette. Do not let the liquid touch skin.
4. Move the liquid to the correct disposal.
5. Remove broken glass using tweezers. Remove any remaining liquid
on the instrument. Do not let the liquid touch skin.

Measure the temperature of the heating block

Measure the temperature of the heating block to make sure that the
temperature shown on the display is correct.
The temperature shown on the display is the temperature in a closed
sample cell that is filled with a liquid. While the temperature of the
heating block is increasing, the temperature of the heating block, near
the heater, may be greater than the temperature shown on the display.
Tools needed:
• Sample cell (LT 200: LCW906, DRB 200: 2275800)
• Glycerol (anhydrous), 5 mL
• Thermometer, stem-type, calibrated for 95 to 155 °C (203 to 311 °F),
type 67C to ASTM
To measure the temperature of the heating block:
1. Fill a clean, empty sample cell with glycerol that is at room
temperature.
2. Put the thermometer in the sample cell until the thermometer touches
the bottom of the sample cell.
3. LT 200: Make sure that the level of the glycerol is 62 mm ± 0.5 mm
(2.44 in. ± 0.02 in.) from the bottom of the sample cell when the
thermometer is in the sample cell.
4. DRB 200: Make sure that the level of the glycerol is 56 mm ± 0.5 mm
(2.20 in. ± 0.02 in.) from the bottom of the sample cell when the
thermometer is in the sample cell.
5. Put the sample cell in the center opening of the second row of the
heating block.
English 11