Hach-Lange 2100 AN Laboratory Turbidimeter User Manual - Manual (Page 50)

Delete all the ASC data points
Either of the ASC calibration curves can be deleted and the ASC unit
name changed back to the factory default.
1. Push UNITS/Exit until the correct ASC name is shown on the
display.
2. Push CAL/Zero to enter ASC calibration mode.
The display flashes "EDIT?".
3. Push the up or down arrow key until "DEL?" flashes on the display.
4. Push ENTER to delete all the ASC data points and change the ASC
unit name back to the factory default.
Maintenance
D A N G E R
Multiple hazards. Only qualified personnel must conduct the tasks
described in this section of the document.
Clean the instrument
Keep the instrument clean to get continuous and accurate operation.
N O T I C E
Never use cleaning agents such as turpentine, acetone or similar products to
clean the instrument including the keypad.
1. Turn the instrument off and disconnect the power cord.
2. Clean the surface of the instrument with a soft, moist cloth and a
weak soap solution.
3. Dry the surface of the instrument with a lint-free cloth.
Change the filter assembly
N O T I C E
The filter assembly is fragile and must be handled with care to prevent damage.
1. Hold the tab of the filter assembly and pull straight up and out of the
instrument.
2. Store the filter assembly in a clean container.
3. Before installation, clean the lens of the filter assembly. Refer to
Clean the filter assembly on page 48.
4. Hold the tab of the filter assembly with the arrows pointing toward the
front of the instrument.
5. Push the filter assembly fully into the housing.
Clean the filter assembly
Note: Be careful not to push the lens out of the filter assembly.
1. Clean both sides of the lens of the filter assembly with glass cleaner,
lens cleaner or isopropyl alcohol, and a cotton-tipped swab or lens
tissue.
2. Inspect the filter glass for scratches or other damage.
3. If a cloudy circle is seen around the edge of the filter, the filter
material is delaminating. Replace the filter assembly.
Replace the lamp
C A U T I O N
Wear protective eye wear when the lamp is turned on and the lamp cover is
removed.
C A U T I O N
Burn hazard. The lamp must be cool before removal from the instrument.
Notes:
48 English