ECM BB100, Instruction Manual, Page: 26 / 37

4. Starting at a flow of about 4 LPM, record the frequency from the BB100 and the actual
(ie. not corrected to “standard” conditions) volume flowrate entering the BB100. Keep in
mind that due to pressure and temperature changes between the flow calibration
apparatus and the inlet of the BB100, the flow entering the BB100 (Vbb) is related to the
flow reported by the flow calibration apparatus (Vfca) according to the relationship:
Vbb = (Pfca/Pbb) x (Tbb/Tfca) x Vfca
Where: Pfca and Pbb are the absolute pressures at the flow calibration apparatus and the
inlet to the BB100 respectively.
Tfca and Tbb are the absolute temperatures at the flow calibration apparatus and
the inlet to the BB100 respectively.
5.
Increase the flow and repeat step 4 (above) in steps until approximately 150 LPM. Up to
51 datapoints can be taken. The first datapoint must be “0.0 0.0” (zero frequency
<space> zero LPM).
6.
After the data has been taken, enter it into any editor (such as Word, for example). Type
in the data in the following manner (not including arrows and notes) and save it in a text
file format. Note that the flow data must have a single space between the frequency and
the LPM and both the frequency and the LPM must have a decimal point.
12/25/1998
←
the date in format: month/day/year
0.0 0.0
←
the first data point in format: frequency LPM (ie. Vbb)
322.0 4.1
←
the second data point in format: frequency LPM (ie. Vbb)
. .
. .
. .
9282.0 151.1
←
the last data point in format: frequency LPM (ie. Vbb)
A minimum of two and a maximum of fifty one data points are to be entered.
7. Save the data file with a filename and the extension “.raw” (ex. CAL3211.RAW).
8. Start the program BBREMOTE and activate the option “PROCESS RAW DATA” (under
“FILE”). The program will ask for the filename of the data file to process. For the above
example, CAL3211.RAW would be entered. The program will process the file and
produce a calibration file with the same filename but the extension .BB (ex.
CAL3211.BB).
9. Activate the option “LOAD CAL DATA FROM DISK” (under FILE). The program will
ask for the filename of the calibration file. For the above example, CAL3211.BB would
be entered. To download the calibration file to the BB100, use the “DOWNLOAD CAL
DATA TO BB100” option (under COMMANDS). The calibration file will be
downloaded to the BB100. Note that the calibration file, not the data file is to be
downloaded to the BB100.
10. Connect the BB100 to the flow calibration apparatus again and check its accuracy.
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