Hach LXV526.98.2011A Betriebsanleitung Seite 22

b. Select an option.
Option Description
+ Select when the water is higher than the top mark (+).
0 Select when the water is between the top mark (+) and than the bottom mark (–).
– Select when the water is lower than the bottom mark (–).
Section 5 Calibration
Chemical exposure hazard. Obey laboratory safety procedures and wear all of the personal protective
equipment appropriate to the chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
5.1 Set the auto calibration settings
Note: Only do this task if the analyzer has a calibration bottle. Refer to Product overview in the installation manual
to identify the calibration bottle.
Set the auto calibration schedule and select the channel used for calibrations. The manufacturer
recommends that the analyzer is calibrated at 7-day intervals (weekly).
1. Push cal, then select SET AUTO CALIBRATION.
2. Select and configure each option.
Option
ENABLE AUTO
CAL
STD SOLUTION
TIME BASE
WEEK DAY
TIME
SET INTERVAL
SELECT CAL
CHANNEL
5.2 Do a calibration
Let the analyzer operate for 2 hours after initial startup (or storage) to become stable, then do a
calibration.
Over time readings can drift to higher or lower than they should be. For the best accuracy, calibrate
the analyzer at 7-day intervals (weekly).
22 English
Description
NO—Sets auto calibration to off. YES (default)—Sets auto calibration to on.
Sets the concentration of the calibration standard that is in the analyzer bottle (default:
10,000 ppb = 10 ppm).
Note: If the concentration of the calibration standard is 100 ppm or higher, set the
measurement units setting to ppm.
DAYS (default)—Sets calibration to occur on selected days at a selected time (e.g., daily
at 9:00 am). HOURS—Sets a time interval between calibrations (e.g., 168 hours =
7 days).
Note: The WEEK DAY option only shows when TIME BASE is set to DAYS.
Sets the days a calibration is done. An auto calibration is done weekly on Sunday by
default. The recommended time interval between calibrations is 7 days.
Note: The TIME option only shows when TIME BASE is set to DAYS.
Sets the time a calibration is done (default: 02:00 = 2:00 am).
Note: The SET INTERVAL option only shows when TIME BASE is set to HOURS.
Sets the time interval between calibrations. Options: 2 to 255 hours (default: 168 hours =
7 days). The recommended time interval between calibrations is 7 days.
Selects the channel used for calibrations (default: Channel 1).
Note: Do not select a channel that contains the symbol "~" (e.g., 4-~SAMPLE4).
Channels that contain the symbol "~" are not measured.
C A U T I O N