Hach Ultra MET ONE 227, Руководство пользователя

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Operation
4.4.4.2 Set sample period and hold times
To set the sample Period and Hold times:
1. Press
4 (CLK)
on the main screen.
2. Press
2 (NXT)
to display the Period and Hold screen (refer to Figure 14 ).
3. Press
1 (PROG)
to enter the Program mode.
4. Press
1 ( → )
to move the cursor along the digits.
5. Press
2 (INC)
and
3 (DEC)
to set the Period time to 1 minute and the Hold time to
1 second as shown.
6. Press
4 (RET)
to save the settings and return to the main screen.
Once all the parameters are set, begin to sample the room. One possible sampling
pattern is as follows:
1. Take the counter to the center of the first area to be tested.
2. Place or hold the counter about 4 feet off the floor. Make sure that the opening of the
isokinetic probe faces directly into the laminar flow.
3. Press
1 (RUN)
to initiate counting. The display shows three 1-minute samples being
taken, separated by a 1-second hold time. When the three 1-minute samples are
complete, the MET ONE 227 particle counter will stop the count.
4. Move the MET ONE 227 particle counter to the next location that needs to be
sampled. If required, reprogram the Location Number to reflect the movements in the
room.
5. When sampling is complete, print or download the count results. Analyze the results
to verify the condition of the room.
Note: The preceding steps may be modified to create a sampling pattern that fits specific needs.
Figure 14 Period and hold screen