L55 and IL55BV2 Sensor Instruction Manual
8 Application Example: Sludge Density Monitor
A common application for the IL55/IL55BV2 sensor is the in-line monitoring of Sludge Density in the outlet pipe of
settlement tanks. The sensor in combination with either a 7200 or 8100/8200 monitor will detect the sludge density in
the pipe, providing information that allows the user to control the de-sludging of the tank.
The instrument will warn of a low level of suspended solids being pumped from the tank allowing the user to stop
pumping and allow the sludge density to build up in the tank. This prevents water or thin sludge being passed to the
sludge treatment system.
The system is often used for the de-sludging of settlement tanks as shown below in
163790IM-Iss05 Issue Date 11/05/210
Page 15 of 22
IL55 SENSOR
SETTLEMENT
TANK
SLUDGE
SLUDGE
SUPERNATENT
SUPERNATENT
8100
MONITOR
