29
Operation
4.7 Counter operation
Once the MET ONE HHPC-6 configuration is set:
•
Use the zero count filter to verify the operation of the MET ONE HHPC-6.
•
Collect the air samples.
•
Transfer the data taken from the air samples to a computer for further analysis.
•
Print the data if necessary.
•
Review the number of samples in the print buffer
•
Clear the print buffer if necessary.
4.7.1 Verify the MET ONE HHPC–6 with a zero count filter
Once the configuration for the MET ONE HHPC–6 is set, verify the operation using the
zero count filter. All HHPCs must be verified prior to sampling to make sure that the
instrument is not false counting due to sensor leakage, internal or external electrical
interference or any other reason. Before the MET ONE HHPC–6 is used in a clean-room
or a clean manufacturing environment, purge the MET ONE HHPC–6 with a zero
count filter.
Note:
The verification process of the MET ONE HHPC–6 meets the Japanese Industrial Standard
B9221–1997 (JIS).
To verify the MET ONEMET ONE HHPC–6:
1.
Install the zero count filter (refer to
section 3.3.3 on page 13
).
2.
Set the Sample Volume to Manual operation mode. Continue to sample until there
are no new counts.
Note:
Initial counts are typically from particles shed from components used for zero counting.
Note:
Follow the zero count process or guidelines as per the applicable industry standard(s).
3.
Remove the zero count filter. Attach the isokinetic probe to resume
normal operations.
4.7.1.1 Verify MET ONE HHPC–6 with a zero count filter for indoor air and other applications
Important Note:
Follow all applicable industry guidelines before the verification process
of the MET ONE HHPC–6.
The zero count process may not be necessary when sampling indoor air quality or other
non-clean-room sampling. Consider the following conditions before sampling indoor air:
•
If the sample concentration is higher than 500,000 particles per cubic foot on the
smallest sized channel, further larger volume sampling may not be necessary since
the high counts provide ample statistical data.
•
If the smallest sized channel counts are low, then set the sample volume to 0.1 CF or
larger.
To sample indoor air:
1.
Set the sample volume to 0.01 CF in the Concentration counting mode.
2.
Purge the instrument after each high sampling count and connect the zero count filter
(refer to
section 3.3.3 on page 13
).
3.
Set the sample volume to 0.1 CF and start sampling.
Note:
The process purges particles from the instrument flow path and keeps the sensitive optics
clean. Refer to
Table 2 on page 19
for detailed information on sample counts.
Содержание MET ONE HHPC-6
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Страница 7: ...6 Specifications ...
Страница 10: ...9 General Information Figure 2 MET ONE HHPC 6 1 Front view 3 Back view 2 Bottom view ...
Страница 11: ...10 General Information ...
Страница 35: ...34 Maintenance ...
Страница 39: ...38 Replacement Parts and Accessories ...
Страница 42: ...41 Section 10 Certification ...
Страница 43: ...42 Certification ...
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Страница 51: ...Trademarks are property of their respective owners Specifications subject to change without notice ...
