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4.2
Analysis Timer
The analysis timer is programmed with program specific color development times for all factory calibrated
programs. When the analysis timer is turned on (Configuration/Photometry/Analysis timer menu), it is active for
all factory calibrated programs and can not be bypassed. When the analysis timer is turned on and a program is
selected to run, the meter will show a prompt for starting the analysis timer. When
START/ENTER
is pushed, the
analysis timer displays and counts down the required color development time and then beeps. When the meter
beeps,
START/ENTER
must be pressed twice
to obtain a the concentration measurement.
4.3 Timer
There may be waiting periods in between the individual steps of a test method. The Timer function can be used
to manually set these time intervals. The timer is set and started in the Configuration/Timer menu by entering a
time interval. The timer is displayed in the lower left corner (status line) of the display. When the selected time
expires, the meter beeps. Press
START/ENTER
to stop the beeping.
4.4 Measuring Diluted Samples
If the concentration of a sample exceeds the measuring range of a test method, it may be reasonable to dilute
the sample with distilled water prior to analysis. The corresponding dilution factor (1....99) can be manually set
on the photometer so that test results are automatically adjusted for the dilution factor. After selecting the
program for which a sample dilution is to be employed, go to the Configuration/ Photometry/Dilution menu to
specify the appropriate dilution factor. Once the dilution factor is set, the meter applies the dilution factor and
displays the concentration of the undiluted sample
. The entered dilution factor is only valid for the selected
program. If a dilution factor is active, it is indicated on the display during measurement as follows:
[x + 1].............with x = parts water and 1 = parts sample.
The dilution factor is erased if:
!
the photometer is turned off
!
a different program number is selected
!
the factor 0 is entered in the Dilution menu.
NOTE
: Sample dilution is not appropriate for all analytes.