Hach Ultra MET ONE 227, User Manual, Page: 24 / 59

23
Operation
4.5 Average mode
In the Average mode, the MET ONE 227 particle counter counts for the number of
sample periods programmed and then stops. The results displayed for both the channels
are the average results of all the cycles. The minimum and maximum number of counts in
all cycles are also displayed.
To program the MET ONE 227 particle counter for Average mode:
1. Press
2 (DSP)
on the main screen
.
2. Press
2 (NXT)
to display the Count mode screen (refer to Figure 15 ).
3. Press
1 (PROG)
to enter the Program mode.
4. Press
2 (INC)
or
3 (DEC)
to select the Average mode.
5. Press
4 (RET)
. The Num Cycles screen is displayed in the Program mode
(refer to Figure 16 ).
6. Press
2 (INC)
or
3 (DEC)
to select the required period.
7. Press
4 (RET)
to save the settings and return to the main screen.
8. Press
1 (RUN)
to begin the count cycle. The count status display will display “Wait”
while the pump comes up to speed, then display “RUN” when the MET ONE 227
particle counter takes a sample. The MET ONE 227 particle counter will display
“Hold” for the programmed Hold time between samples. When the programmed
number of count cycles is complete, the MET ONE 227 particle counter will stop
sampling and display the Completed Samples screen (refer to
Figure 17 on page 24 ).
Press
1
,
2
or
3
to view the average, minimum and maximum counts respectively.
9. Press
4 (RET)
to return to the main screen.
Figure 15 Count mode screen
Figure 16 Num cycles screen in program mode