Emerson Process Management manual About the MSL600, About this Manual

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Installation, Operation & Maintenance Manual

MSL600

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.

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Contents Installation, Operation & Maintenance Manual MSL600Contents MSL600 12.1 12.2Before Operating this Device the Manual should be Read Fully About the MSL600 About this ManualHuman Machine Interface Important MSL600 featuresSelf-cleaning Mounting bracketAs a system LocationApplication planning Circular clarifiersRotating bridge Rectangular clarifiers Static bridgeLocation InstallationPreliminary checks Mounting bracket attachmentInstalling the bracket on the bridge Attaching the MSL600MSL600 mounting Power and other electrical connections Transducer connectionsExternal connection terminals Cable extension Programming DisplayContrast viewing angle control Keypad and Menu NavigationSecurity On-line/Off-lineQuick start parameters Tank depth Bottom referenceTransducer self-cleaning Determination of tank depthCurrent output adjust MA current output parametersAlarm Relay parametersTransducer out-of-water time Digital input Main menu item Detailed operationMenu structure Menu Item DescriptionDirect access Parameter editingScrolling Installation parameters Application parametersMain menu parameters Start On P250 De-sludge parametersDescription P240 Stop On P251Interval P254 Stop If P252Start Time P253 Max Retries P257Cleaning parameters MA output parametersAlarm Action P402 4 0/4-20mA P403Relay RL1 mode P410 and RL2 mode P420 Alarm mode relay RL1 and RL2 parameters P540 toTable B Relay Parameter numbers De-sludge mode relay RL1 and RL2 Fault mode relay RL1 and RL2 parameters P560 to P570Set point mode relay RL1 and RL2 On mode relay RL1 and RL2Relay overrides Min ON, Max ON, and Min OFF Display parameters HMIRelay On and Off Points HMI upper, middle, and lower display optionsBacklight On/Off P575 Clear TrendClear Profile Log Interval P590 Low Mem Alarm P593Logging parameters Fast log P5911 Alg. Select P620 Parameter values Default Min Max 128 1024Engineering parameters Common algorithm parameters P621 to P629Default Min Max +85 105 185 Parameter values Default Min Max 100 Top Blanking P623Parameter values Default Min Max 9999 Upr S-nat Temp P625 Noise Alrm Lev P622Lwr S-nat Temp P626 Default Min Max +85 185 SoS constant P627Default metric m/s Bottom Blanking P628Significance P630 Parameter values Default Min Max Lost Echo Rnge P633Municipal 1 parameters P630 to P637 Sharp Echo Reject P631Parameter values Default Min Max 255 Parameter values Default Min Max Dirty Mult P636Parameter values Default Min Max Lost Echo Time P637 Noise SD Mult P635Threshld Offset P640 Parameter values Default Min Max 100Municipal 2 parameter P640 Threshold level = Threshld Offset P640 + Noise Level D834Auto Cycle function Load Defaults functionSystem parameters Display testSettings parameters P730 to P737 and Base Units selection Comms parameters P710 to P716PIN parameter P740 Fixed parameters D750 to D753Readings and diagnostics parameters Readings parameters D800 to D834Diagnostics parameters D835 to D852 Speed of Sound D850 Max Xdr Temp D851Min Xdr Temp D852 Technical reference MaintenanceTroubleshooting Transmit pulse and echo processingProgramming chart Sub-menu Level Parameter Title Par No Main Menu OptionProgramming chart … Direct Model No Specification12.1 MSL600 OutputsWeight Additional specification notes12.2 MSL603 transducer Dimensional drawings MSL600 Bridge mounted unitMSL600 and MSL603 assembly MSL603 transducer cable extension Parts requiredFitting instructions MSL600 MSL600 Emerson Process Management Rosemount Measurement
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