Chapter 4: processing the data, Front end algorithm – AMETEK 7100 Leak Detect Stik User Manual
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Chapter 4: Processing the Data
Data acquisition was discussed in Section 3 to the degree that memory locations are filled with an array of
data from a selected number of frames. It is now appropriate to test for data integrity, average and/or filter the
data, and then convert from binary counter values to scaled, meaningful numbers.
4.1: Front End Algorithm
A technique for eliminating any possible erroneous data is to discard some of the highest and lowest count
values. Lets assume that there is some uncontrolled source of harsh electrical noise causing erroneous data
to be received once approximately every 100 to 1000 frames. The table below shows appropriate numbers of
High and Low discard values to ensure that no erroneous data is used.
After discarding the Highs and Lows, the remaining data is averaged and the results are referred to as one
Probe Reading. These discard numbers are only guidelines. They may be changed to accommodate more or
less frequently encountered noise problems, depending upon the installation environment.
One probe reading contains ten values, one for product level, one for water level, and eight for temperature.
Parameter
Highs
Discarded
Lows
Discarded
Probe Reading is the Average of
Product
12
12
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Water
2
2
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Temp #1
2
2
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Temp #2
2
2
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Temp #3
2
2
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Temp #4
2
2
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Temp #5
2
2
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Circuit Temp
2
2
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LO Reference Temp.
2
2
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HI Reference Temp.
2
2
12 of 16