Hach LANGE DR 900 Manuel D'utilisation page 13

7. Add the calibration points: a minimum of 2 and a maximum of
*
12 calibration points. Select Edit Std 1 and enter the first standard
concentration value. Push Done.
Note: A beep means that the concentration is a duplicate of a previously
entered standard or the concentration is too high for the selected resolution.
Enter a different value and continue.
8. Enter the absorbance value:
Option Description
Edit ABS Manual Use the navigation keys to enter the absorbance value
manually.
Edit ABS Auto
1. Put the blank into the cell holder and push Zero.
2. Put the prepared sample into the cell holder and
push Read.
3. Push Done.
Note: A beep means that the absorbance is a duplicate of a previously entered
standard or that it falls between two previous standards. Enter a different value
and continue.
9. Push Done.
10. Select Add Cal Point.
11. Enter additional calibration points as described in steps 7–9.
12. Select Save User Program.
Edit a user program
To edit a stored user program:
1. Select HOME>Favorites/User Programs.
2. Select the applicable program and push Options.
3. Push Edit.
4. Obey the screen prompts to edit the procedure.
*
If the curve is known to be linear, only two concentration data points (e.g., a standard with zero absorbance and another known standard) are
necessary. Use additional data points to confirm linearity or define a nonlinear curve.
Delete a user program
Delete a stored user program if the program is not used anymore.
1. Select HOME>Options>Favorites/User Programs.
2. Highlight the applicable program and push Options>Delete and
obey the screen prompts.
Instrument information
The instrument information menu shows specific information such as the
instrument name, serial number, software version, database version,
memory used and program availability. Push
SETTINGS>Setup>Instrument Information.
Set the password
The password settings options are used to prevent access to restricted
menus.
Note: If the specified password is forgotten and Security Options is set to on, the
operator is locked out of the restricted menus. Contact technical support if the
password is forgotten.
1. Push SETTINGS>Setup>Password Settings.
2. Select an option.
Option Description
Password Select On or Off to set the password protection to on or
Settings off.
Protected Items Shows the list of protected items: edit operator ID, edit
sample ID, edit user programs, date & time, upgrade
firmware, upgrade methods, language and edit favorites
list.
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