Measuring
Contamination with a Current Sensor
An electrostatic precipitator is placed on an industrial smoke stack to
remove particulate pollutants. The filter grids within these precipitators
are charged with a known voltage and operate at a specific current level
when the grids are clear of conductive materials. As these materials are
trapped and absorbed by the grid, the current increases due to leakage
between the grids. This increasing current can be detected by
a current sensor. For constant monitoring, (as shown) a linear analog
output current transducer like the TCSA would be selected. The output of
the TCSA is connected to a meter or
an analog input module of a PLC.
PLC=Programmable Logic Controller
AI=Analog Input Module
AO=Analog Output Module
For alarm applications, (not shown) a current sensor with a
preset trip level like the ECS Series is used. When the current level
reaches a preset level, the ECS Series output relay
energizes and an alarm buzzer or lamp is energized.
|
