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Since the performance of many precipitators deteriorates when the resistivity value exceeds 2 x 1010 ohm-cm, resistivity data are used in many ways:
Resistivity data are also used in the selection
of allowable voltage/current relationships for computer modeling
of precipitator performance.
The recommended sample for particulate characterization
is a proportionately blended hopper sample representing inlet through
outlet hoppers for a given precipitator chamber. Knowing the electrical
section and hopper layout and the design or measured efficiency,
calculations are made to determine the amount of dust to use from
each hopper to reconstruct the original inlet sample. The blended
hopper sample is large enough to permit a variety of tests to be
conducted. Isokinetically obtained samples, individual hopper samples
and samples removed from wires and plates are also useful for specific
purposes.Other available particulate characterization techniques
include:
Unique resistivity tests involving collection plate sections or unusual test conditions and procedures.
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