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MSL600
Installation, Operation & Maintenance Manual
IP262/Z0, Rev. AB
February 2012
1. Introduction
Before operating this device the manual should be read carefully paying particular attention to the safety
precautions laid out in section (i).
This instruction manual provides comprehensive information specific to the Mobrey Measurement continuous
suspended solids blanket level monitor, the MSL600.
1.1 About the MSL600
The basic MSL600 system contains an ultrasonic transducer and a bridge-mounted control unit.
The control unit is microprocessor-based and is given the designation MSL600. It is intended to be mounted on a
bridge using a specially designed and easy-to-install mounting bracket that is supplied with the system.
The system is specially adapted for use with clarifiers and thickeners containing municipal and industrial
wastewater treatment sludge. The MSL600 provides a means of sensing the presence of the sludge blanket and
measuring its depth in the clarifier. It also provides a range of current and relay outputs to the user for control and
alarm purposes.
The MSL600 uses the sonar principle, with an ultrasonic pulse transmitted under water from a partially
submerged, IP68-rated transducer (MSL603). The pulse of ultrasound is transmitted vertically down into the
clarifier tank, and then reflects from the surface of the sludge blanket. The system captures the ultrasonic echoes
received from the sludge blanket interface and determines the time-of-flight of the echo from the transducer to the
sludge blanket.
Knowing the speed of sound in the supernatant (the system has automatic temperature compensation), the
control unit calculates the distance to the blanket interface. This distance is then subtracted from the
programmed depth of the tank to give the sludge blanket depth or interface level. This is the system’s
fundamental process variable.
1.2 About this Manual
This section introduces the user to the MSL600 system, its components and key features. The system’s mode of
operation is explained in this section.
In section 2, the manual discusses application planning where installation is primarily intended to be on municipal
and industrial wastewater clarifiers.
In section 3, the manual discusses the actual physical process of mechanical and electrical installation of the
system. This section provides a step by step procedure for easy installation of the MSL600 system on site.
In section 4, the manual introduces the basics of programming the system. This section introduces the human
machine interface (HMI), keypad and display
In section 5, the manual discusses the minimum programming steps needed for commissioning the system so
that a meaningful measurement can be made. This quick start setup section is intended to cater for the needs of
most users.
In section 6, the manual discusses in more detail the human machine interface and how the system is
programmed.
In section 7, all of the system’s parameters are discussed and their function detailed. Sections 6.0 and 7.0 are
primarily intended for the more advanced user who needs to tune the system to meet an unusual application.
In section 8, the manual discusses in detail the mode of operation of some of the key system elements. This
section is intended for the most advanced user.