Pulsar SLUDGE FINDER 2 User manual

SLUDGE FINDER 2

SERVICE MANUAL

PULSAR ULTRA SERIES

SLUDGE FINDER 2 SERVICE MANUAL (FIRST EDITION Rev 2)

June 2017

Part Number M-920-S-001-1P

COPYRIGHT

reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form

without the written permission of Pulsar Process Measurement Limited.

WARRANTY AND LIABILITY

Pulsar Process Measurement Limited guarantee for a period of 2 years (for the integrator), and 1 year (for the

transducer), from the date of delivery that it will either exchange or repair any part of the product returned to

Pulsar Process Measurement Limited if it is found to be defective in material or workmanship, subject to the

defect not being due to unfair wear and tear, misuse, modification or alteration, accident misapplication or

negligence.

DISCLAIMER

Pulsar Process Measurement Limited gives nor implies any process guarantee for the product, and shall have

no liability in respect of any loss, injury or damage whatsoever arising out of the application or use of any

product or circuit described herein.

Every effort has been made to ensure accuracy of this documentation, but Pulsar Process Measurement

Limited cannot be held liable for any errors.

TECHNICAL ENQUIRIES

Please contact Pulsar Process Measurement Limited for technical support.

COMMENTS AND SUGGESTIONS

If you have any comments or suggestions about this product, then please contact:

Pulsar Process Measurement Limited

Cardinal Building

Enigma Commercial Centre

Sandy’s Road

Malvern

Worcestershire

WR14 1JJ

United Kingdom

Tel: 01684 891371 (International +44 1684 891371)

Fax: 01684 575985 (International +44 1684 575985)

Web Site: http://www.pulsar-pm.com

e-mail: info@pulsar-pm.com (general information)

e-mail: support@pulsar-pm.com (product support)

CONTENTS

About Service Parameters....................................................................................................................................... 1

Echo Profile Overview ............................................................................................................................................ 2

Sludge Finder 2 Service Parameters....................................................................................................................... 7

P021 Set Distance ........................................................................................................................................... 7

P043 Breakpoint.............................................................................................................................................. 8

P044 Slope ..................................................................................................................................................... 11

P046 Persist Count (Direct Access Only) .................................................................................................... 11

P047 Outside Count ...................................................................................................................................... 12

P883 Gate Expand (Available in Stability Menu under 1997)................................................................... 12

P050 Negative End ....................................................................................................................................... 13

P051 Margin Enable ..................................................................................................................................... 13

P052 End Margin .......................................................................................................................................... 14

P067 Choose Peak ........................................................................................................................................ 15

P068 Measure Percentage ............................................................................................................................. 16

P079 Use Gate ............................................................................................................................................... 17

P088 Hard Default ........................................................................................................................................ 17

Service Alarm ................................................................................................................................................ 17

P194 Date ...................................................................................................................................................... 17

P195 Interval.................................................................................................................................................. 17

P196 STD Zeroes .......................................................................................................................................... 18

P197 STD Code ............................................................................................................................................ 18

P198 Phone Number ..................................................................................................................................... 18

P199 Reset ..................................................................................................................................................... 18

P884 Trace Update ........................................................................................................................................ 19

P885 Threshold Percentage .......................................................................................................................... 19

P886 Minimum Threshold ........................................................................................................................... 19

P887 Wipe Interval ....................................................................................................................................... 20

P888 Motor Persist ........................................................................................................................................ 20

Sludge Finder 2 Troubleshooting ......................................................................................................................... 22

Page 1

About Service Parameters

The following parameters can only be accessed via the following passcode

552621 and can be used to modify Echo Processing Algorithms in particularly

arduous applications.

Further parameters allow changes to parameters specific to communications and

other hardware functions.

Care and caution should be exercised when changing any of these parameters

and any such changes should only be undertaken by, or under the guidance, of

an experienced Service Engineer.

Direct Access.

In order to access parameters directly use the following procedure.

Some parameters are not part of the menu system and can only be accessed

directly. To do this use the cancel key until there are no digits in the main

display then key in the parameter number and press enter.

Page 2

Echo Profile Overview

The Digital Adaptive Tracking of Echo Movement, is a powerful algorithm

unique to Pulsar’s ultra range of products. Care should always be taken when

adjusting and analysing echo profiles, if in doubt, please contact Pulsar technical

department.

There are no ‘typical’ echo traces for Sludge Blanket applications, the echo

returns vary widely with the type of application and the concentration levels of the

Sludge.

The screen shot below is a Secondary Clarifier approx 70% full.

The y axis indicates signal strength and the x axis is distance.

The black shape is the echo profile of the sludge.

The blue line indicates the measuring point.

Page 3

The Components of the Echo Profile Display.

Threshold

Line

Measuring

Window

Measuring Line

Echo Profile

Tank

Floor

Indicator

Page 4

How to interpret the echo profile screen.

The first echo that is reflected back to the transducer is from the top of the sludge

blanket, the second echo with the sharper leading edge is the echo reflected back

from the bottom of the tank.

Page 5

Problematic Echo Profiles.

This echo profile is typical of what you would see if the transducer was out of the

water

No echo returns.

There is no sludge present the echo return is from the bottom of the tank

Page 6

The transducer is surrounded by material in flight, or, the blanket level is high

enough to be surrounding the transducer.

Multiple echoes, the unit is receiving multiple signal returns, either from different

densities of Sludge Blanket, or, an object in the water.

Page 7

Sludge Finder 2 Service Parameters

P021 Set Distance

Use this parameter to tell the unit which of the echoes is the correct one in a

situation where there are multiple echoes, or there is a large amount of ’material

in flight’ in the area above the interface.

Establish the distance from the face of the transducer to the interface in

measurement units and then enter this value into P21.

The unit will lock onto the true echo and attempt to suppress any unwanted echoes

in the settling zone above the interface leaving the correct echo untouched.

Example. The settled sludge is at 4m distance but, there is an echo from a ‘rag’

layer at 2.5m, go to parameter 21 and enter 4m thus informing the unit which of

the echoes it is required to measure, the unit will then auto-adjust to this echo.

Default = 0.00

Page 8

P043 Breakpoint

The gain starting point in meters, for signal amplitude decay compensation. Used

in conjunction with P44, to establish fixed gain levels. See table below for details.

Application Type SBR

Application Type Secondary

Default = Application Dependant

Application Type

SBR

Industrial

Primary

Secondary

P43 Breakpoint (metres)

1.0m

1.5m

1.0m

P44 Gain (slope/angle)

5

10

15

P050 Negative

End Setpoint.

Default = 80

Values Min = 0m Max = 99.9m

Page 9

In addition to the operator adjustable signal amplitude decay compensation there

is also an existing layer of suppression programmed into the Sludge Finder

software. This suppression becomes active when SBR’s or Secondary are chosen

as the application type.

The suppression works by applying negative gain compensation to the settle zone

in front of the leading edge of the gate as indicated below.

If Industrial or Primary is chosen as the application type this compensation is not

present. However, in instances where there are large amounts of settling material

in front of the true echo, as shown below by the Blue Trace (the Raw Echo Signal

Return), and the operator adjustable signal amplitude decay compensation is not

sufficient, it may be necessary to alter the application type to increase signal

suppression.

Application Type

SBR

Industrial

Primary

Secondary

Settle zone signal

suppression active

No

Yes

Page 10

The compensation works as explained below.

Page 11

P044 Slope

This sets the angle of the positive time varied gain line. That is, the amount of

gain applied. See the explanation of P43 for details.

Values Min = 0

Max = 1000

P046 Persist Count (Direct Access Only)

This parameter determines the number of processed echoes the unit will need to

see moving in the same direction before the display reading is updated. This is to

help prevent the displayed reading from fluctuating whilst inside the gate. Sludge

echoes are constantly changing shape and in order to prevent the reading from

‘hunting’, the echo has to move in the same direction for 5 counts in order for it to

be seen as a trend and update the reading.

Values Min = 1

Max = 1000

Default = Application Dependant

Default = 5

Page 12

P047 Outside Count

This parameter determines the number of processing cycles, or transducer ‘shots’,

that any valid echo must be seen outside of the gate before the gate will move and

allow the new echo to be processed. This will prevent any unwanted update, or

false readings being given due to the intermittent appearance of echoes from

devices such as scrapers.

Values Min = 1

Max = 5000

P883 Gate Expand (Available in Stability Menu under 1997)

This parameter is closely associated with the Outside Count as part of the

Damping parameters designed to make the reading more stable. When the Outside

Count has expired and the Gate is moving towards a new target then it expands at

a rate of 0.1m after every cycle.

Values Min = 0

Max = 99.99

Default = 10

Default = 0.1m/min

Page 13

P050 Negative End

The point at which, the negative gain line intersects the 0.0m distance y axis.

This parameter determines the angle at which the rate of near signal amplitude

suppression, (gain attenuation), is applied, over a distance starting at the gain

breakpoint . See the explanation of P43 for details.

Values Min = -999

Max = 999

P051 Margin Enable

This parameter is associated with P52 End Margin.

1 switches the feature on

0 (off) is the default value

Values Min = 0

Max = 1

Default = 80

Default = 0 off

Page 14

P052 End Margin

The End Margin sets a boundary within which the Secondary Negative Gain

applied from the front of the gate is released.

Sometimes during periods of rain or high flow the interface is disturbed, this can,

under certain conditions, cause the unit to read incorrectly low.

When the event is over and the interface is re-forming at a higher level the

negative gain applied at lower levels is preventing the correct echo from being re-

established.

When the ‘End Margin’ is set to on and the echo falls to a level below the level

set in P52, then the Secondary Negative Gain applied from the front end of the

gate is not applied and the unit has a chance to re-establish itself on the correct

echo.

Values Min = 0.00m

Max = 99.99m

Note * The unit as does not apply negative gain at the front of the gate as a default

when no echoes can be seen within the system span (i.e. no ‘Normalised’ echo

trace).

If this is required, then set P51 = 1 and P52 = 0

*Versions 111E and above.

Default = 0.2m

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