715 Portable – Instruction Manual
1 Introduction
The 715 Portable Sludge Blanket Level Detector is designed for spot checking sludge interface
levels in settling tanks. The 715 works by measuring the change in the level of suspended solids
as the sensor is lowered into the tank. When the sensor reaches the sludge blanket, an audible
signal changes from a fast bleeping to a slow bleeping. A red LED provides a visual indication
that the sludge blanket has been detected. To enable measurement of the sludge interface
position in a tank, the sensor cable is marked in one-metre intervals from the sensor.
The 715 consists of two main parts, a cable reel and an IR sensor. The cable reel houses the
detector electronics and battery and is also used to store the sensor cable when not in use. The
715 is supplied with either an IR8, IR15, IR40 or IR100 sensor as required for the application.
The IR sensors use light attenuation across a single measurement gap to determine the
suspended solids in a solution. The length of the sensing gap determines the measurement
range of the sensor.
Page 4 of 10
156770IM-Issue 07 Issue Date 24/10/2010
Front Panel
Fixing Screws
(4off)
Battery
Compartment
Inteface LED
On / Off Switch
Sensor
Sensor
Cable Clip
Reeling
Handle
