Hach Ultra MET ONE 237AB, User Manual

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Appendix C PortAll Software
The clean-room classification standards FS 209E and ISO 14644–1 require specific
particle count measurements and calculations to verify the cleanliness level of a
clean-room or clean area. The PortAll software automatically generates clean-room
verification results from the measurement data from the MET ONE 237 particle counter.
C.1 Connections
In order to communicate with a computer, the MET ONE 237 RS232 mode found in the
SIO menu is set to normal (printer disabled). At the time, MET ONE 237 particle counter
is connected to the computer, the location number is set between 0 and 31 to be
recognized by PortAll software. If there is any communication under computer control, the
keypad will be disabled until the power to the counter is turned off and on (refer to
Figure 25 ).
C.2 Operation
The following four rules must be followed to make sure that an accurate classification
result from PortAll software.
• The data returned from the particle counter contains a location number for each
sample. Change the location number from the front panel instrument controls, each
time the instrument is moved to a new location. The PortAll software relies on the
location number as an accurate indicator of the number of sample locations and
number of samples per location.
• Set the sample time to obtain the required sample volume at each location. (Sample
Time x Instrument Flow Rate = Sample Volume). The PortAll software does not have
access to the instrument flow rate and cannot verify that the sample volume complies
with standard requirements. The MET ONE 237 particle counter can be setup in the
following ways:
• Sample period to one minute (0.1 cubic ft.) and select Normalize Data (counts x
10) in PortAll software
OR
• Sample period to 10 minutes (1.0 cubic ft.) and do not select Normalize Data in
PortAll software
Figure 25 MET ONE 237 particle counter connections
1 Computer 3 Standard 9-pin serial cable
2 PortAll adapter 4 MET ONE 237 particle counter