Hach Ultra MET ONE HHPC-2, User Manual, Page: 19 / 42

18
Operation
4. When the date, month, year or time is set, press the
START/STOP
key to change the
numbers for that field.
5. To select another unit of time, press the
MODE
key to select the next field. Press the
START/STOP
key to change the numbers.
6. When the date and time are set, press and hold the
MODE
key for one second to
save the new setting and return to the Main screen.
4.5.2 Select the count mode
To select the count mode:
1. Press the
MODE
key once on the Main screen. Refer to Table 2 on page 18 for the
different modes available. The bottom line displays the current mode (refer to
Figure 8 on page 18 ).
2. Press the
START/STOP
or the
MODE
key.
3. When the required mode is displayed on the screen, press and hold the
MODE
key
for one second to save the new setting and return to the Main screen.
Figure 8 Select mode screen
Table 2 Count modes
Mode Description Sample unit
Concentration
The Concentration mode is useful for taking a quick snapshot of
airborne particulate samples, especially in areas where
particulate levels are unknown and may exceed the operating
levels of the counter. The MET ONE HHPC–2 estimates count
per cubic foot or liter depending on the volume selected. The unit
updates the results by calculating completed sample counts and
volume compared to the balance of volume remaining.
Volume size
Rate
In the Rate mode, counting is continuous. The sliding average of
ten samples is displayed.
Volume unit
Totalize
In the Totalize mode, number of counts are displayed as they
accumulate, until the end of the sample. When the sample is
completed, the record is stored and the value is displayed on the
screen until the next sample is started.
Volume size