FMC Technologies MPU B Series Reference guide

Multipath Ultrasonic Gas Flow Meter
MPU Series B (6 Long Transducers)
Transducer Replacement Procedure
Procedure Manual
The Most Trusted Name In Measurement
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Note: This manual is the Transducer Replacement Procedure for the old style MPU
Series B ( 6 Long Transducers)

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TABLE OF CONTENT
1. INTRODUCTION ..................................................................................... 5
1.1. Contact Address if Assistance is Required ................................... 5
1.2. Copyright .......................................................................................... 5
1.3. Trademarks ....................................................................................... 6
1.4. Equipment Required ........................................................................ 6
1.5. Consumables .................................................................................... 6
1.6. Reference Documents...................................................................... 6
1.7. Warnings ........................................................................................... 6
2. DISMOUNTING PROCEDURE ............................................................... 9
2.1. Dismounting, Short Form .............................................................. 10
2.2. Dismounting Cable Gland From End Cover ................................. 11
2.2.1. Dismounting (European Model)................................................... 11
2.2.2. Dismounting (USA Model)........................................................... 12
2.3. Dismounting End Cover................................................................. 13
2.4. Dismounting Fastening Cover....................................................... 13
2.5. Dismounting the Transducer......................................................... 15
3. MOUNTING PROCEDURE ................................................................... 17
3.1. Pre-mounting Procedure ............................................................... 17
3.1.1. Cleaning...................................................................................... 17
3.1.2. Visual Inspection ......................................................................... 17
3.1.3. Assumptions................................................................................ 17
3.2. Mounting, Short Form .................................................................... 18
3.3. Mounting the Fastening Cover ...................................................... 20
3.4. Mounting Transducer..................................................................... 21
3.5. Mounting Cable Gland to End Cover ............................................ 23
3.5.1. Mounting (European Model)........................................................ 23
3.5.2. Mounting (USA Model)................................................................ 24
3.6. Mounting the End Cover ................................................................ 25
4. PARAMETER CONFIGURATION ......................................................... 27
4.1. General ............................................................................................ 27
4.2. Calibration certificate..................................................................... 28
4.3. Transducer delays.......................................................................... 29
4.4. Update path lengths ....................................................................... 30

4.5. Documentation ............................................................................... 30
4.6. Example........................................................................................... 31
Pictures
Picture 1 Flame Paths ..........7
Picture 2 Transducer mounting parts .....................................................................10
Picture 3 End Cover Parts......................................................................................13
Picture 4 Fastening Cover Parts.............................................................................14
Picture 5 Transducer with O-rings and Back-up rings mounted .............................15
Picture 6 Fastening Cover Parts.............................................................................20
Picture 7 End Cover Parts......................................................................................25
Tables
Table 1 Transducer pair definition.........................................................................27
Table 2 Database object numbers for zero calibration nodes..................................29
Table 3 Database object numbers for path lengths .................................................30
Figures
Figure 1 Cable Gland and End Cover (European Model) .......................................11
Figure 2 Conduit and End Cover (USA Model) .....................................................12
Figure 3 Fastening Cover Assembly Mounted .......................................................14
Figure 4 Transducer Mounting ..............................................................................19
Figure 5 Transducer Assembly ..............................................................................21
Figure 6 Cable Gland and End Cover (European Model) .......................................23
Figure 7 Cable Gland and End Cover (USA) .........................................................24
Figure 8 Transducer Calibration Report.................................................................28

Kongsberg MPU
Ultrasonic Gas Flow Meter
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MNKS024 Page 5 of 31
1. INTRODUCTION
This manual describes mounting and dismounting of the
transducers for the MPU ultrasonic gas flow meter delivered by
FMC Kongsberg Metering. If further information is needed, please
do not hesitate to contact our service department.
We reserve the right to make changes to the construction and/or
configuration at any time, this manual is based on the latest
information, and may be subject to changes.
1.1. Contact Address if Assistance is Required
Publisher Customer Support
Contact
Address:
FMC Kongsberg Metering AS
P.O. Box 1012
NO-3601 Kongsberg
Norway
FMC Kongsberg Metering AS
P.O. Box 1012
NO-3601 Kongsberg
Norway
Telephone
No.:
(47) 32 28 67 00 (47) 32 28 79 21
Telefax
No.:
(47) 32 28 67 50 (47) 32 28 79 10
E-Mail: [e-mail] [e-mail]
Internet: www.fmcmeasurementsolutions.com
1.2. Copyright
All technical and technological information contained in this
manual, including any drawings and technical specifications shall
remain the property of FMC Kongsberg Metering a.s. and may not
be used (other than for the operation of this product), copied,
multiplied, passed on or communicated to a third party without the
prior written permission of FMC Kongsberg Metering a.s.
©2001 FMC Kongsberg Metering a.s.
Kongsberg, Norway
FMC Kongsberg Metering a.s. is an FMC Technologies Inc.
subsidiary.

MPU Transducer Replacement Procedure
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Page 6 of 31 MNKS024
1.3. Trademarks
Products listed are trademarks of their respective manufacturers.
Company names listed are trade names of their respective
companies.
1.4. Equipment Required
•Adjustable wrench
•Hexagonal key 4, 6 and 8 mm
•Oilstone or fine file
•Seeger ring pliers
•Transducer Removal Wrench ►
•Torque wrench
1.5. Consumables
•O-rings.
•Back-up rings.
•Copper Grease (Copaslip or equivalent)
•Silicone grease (Gleitmo 750 or equivalent)
•Loctite 577 or equivalent
1.6. Reference Documents
Document No. Title
1 USM-0000020565 MPU User Manual, Series B
2 PRD-0000021266 MPU Transducer Replacement Procedure
using Retraction Tool
1.7. Warnings
Warning:Always make absolutely sure that there is no pressure
in the pipe, before removing the Transducer End
Cover.
Do not use metal tools or similar that can damage the
inner surface of the Nozzle when dismounting the
Transducers. The Nozzle has a very fine O-ring
surface to make it possible to use the Transducer
Retraction Tool.

Kongsberg MPU
Ultrasonic Gas Flow Meter
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13fo7egaP
MNKS024
Caution: Spesial attention is required to avoid damages to
flame paths, see Picture 1.
If the flame paths are damaged, the parts must be
replaced and NOT repared.
Flame paths
Threads
Inner
surface
Outer
surface
Picture 1 Flame Paths

MPU Transducer Replacement Procedure
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Kongsberg MPU DISMOUNTING PROCEDURE
Ultrasonic Gas Flow Meter
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MNKS024 Page 9 of 31
2. DISMOUNTING PROCEDURE
This procedure describes how to remove and mount a Transducer
with NO PRESSURE in the pipeline. This can only be done before
the spool piece is installed in the pipeline, or if the operational
pressure is atmospheric and the pipeline is drained of any lethal or
flammable gases.
If it is necessary to remove a transducer from the MPU without
shutting down the line, this is possible by using the Transducer
Retraction Tool. This tool may be ordered as an option, and will be
delivered with its own operational manual. Alternatively, this can
be done by the supplier’s service engineer, bringing the suppliers
own Transducer Retraction Tool.
If the transducer is replaced by a new, remember to update the
acoustic path length and the zero calibration data in the database.
See USM-0000020565 “User Manual, MPU Series B” [1] for
details.
Unless otherwise stated, nuts and screws are removed by turning
counter-clockwise, and tightened by turning clockwise.
Make sure the workplace is suitable for this operation, protected
from rain- or sea water, dirt or oil spill. Cover the MPU with a
protection hood if necessary.

MPU Transducer Replacement Procedure
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Page 10 of 31 MNKS024
2.1. Dismounting, Short Form
A. Remove the mechanical protection for the transducers (if any).
B. Make sure there is no pressure in the pipe.
C. Unscrew the 4 screws on the End Cover and remove it (ref.
section 2.3).
D. Disconnect the Transducer Cable Connector.
E. Check that the Locking Screws are set to outer position or
remove the Fastening Cover (ref. section 2.4).
F. Remove the Transducer by carefully pulling it straight out (ref.
section 2.5).
Picture 2 Transducer mounting parts

Kongsberg MPU DISMOUNTING PROCEDURE
Ultrasonic Gas Flow Meter
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MNKS024 Page 11 of 31
2.2. Dismounting Cable Gland From End Cover
2.2.1. Dismounting (European Model)
NOTE: It is not necessary to dismount the Cable Gland from
the End Cover to remove a Transducer.
A. Dismount part C of the Cable Gland. See Figure 1 below.
B. Dismount part B of the Cable Gland.
C. Part A of the Cable Gland is connected to the End Cover with
Locktite, and shall not be dismounted unless the complete
Cable Gland must be changed.
Cable gland
A B C
Body
elongation
Transducer
A B C
Wire loop
Connector
Cable shield
O-ring
Detail B
End cover
EUROPE
Figure 1 Cable Gland and End Cover (European Model)

MPU Transducer Replacement Procedure
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Page 12 of 31 MNKS024 Rev. B
2.2.2. Dismounting (USA Model)
NOTE: It may not be necessary to dismount the Conduit from
the End Cover to remove a Transducer. However, it may ease
the operation as the Conduit is not very bendable.
A. Pull back the coating over the Conduit Gland.
B. Dismount part B of the Conduit. See Figure 2 below.
C. Part A of the Conduit is connected to the End Cover with
Locktite, and shall not be dismounted unless the complete
Cable Gland must be changed.
Cable gland
AB
Transducer
A
Wire loop
Connector
Cable shield
O-ring
End cover
Figure 2 Conduit and End Cover (USA Model)
USA Model

Kongsberg MPU DISMOUNTING PROCEDURE
Ultrasonic Gas Flow Meter
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MNKS024 Page 13 of 31
2.3. Dismounting End Cover
Before removing the End Cover, make absolutely sure that
there is no pressure in the pipe!
A. Remove the 4 screws (see picture below) located on the End
Cover (quantity may vary on 6” units).
B. Remove the End Cover.
C. Disconnect the Transducer Cable Connector.
D. Make sure neither the End Cover nor the Transducer Connector
is subjected to water ingress or mechanical damage while
dismounted. Do not leave the End Cover hanging by the
Transducer Cable.
Picture 3 End Cover Parts
2.4. Dismounting Fastening Cover
NOTE: It is not necessary to remove the Fastening Cover to
change the Transducer. If the Fastening Cover is left mounted,
the Locking Screws (if any) must be put to their outer position
before pulling the transducer out. See Figure 3 below.
A. Remove the screws.
B. Remove the Fastening Cover by pulling it straight out. In case
the Fastening Cover is stuck to the spool piece, knock gently
with a plastic hammer on the sides while pulling out. Be aware
of the temperature effects on metal.

MPU Transducer Replacement Procedure
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Page 14 of 31 MNKS024
C. Make sure that the Fastening Cover is not subjected to water
ingress or mechanical damage while dismounted.
Picture 4 Fastening Cover Parts
Figure 3 Fastening Cover Assembly Mounted

Kongsberg MPU DISMOUNTING PROCEDURE
Ultrasonic Gas Flow Meter
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MNKS024 Page 15 of 31
2.5. Dismounting the Transducer
A. If the Fastening Cover is removed or the Locking Screws are in
outer position, see Figure 3, the Transducer can be removed.
Enter the Transducer Removal Wrench (TRW) to the threads of
the Transducer and turn clockwise two to three turns. Then pull
the Transducer carefully straight out using the TRW.
CAUTION: Do not use any kind of tools, which may damage
the Transducer while dismounting. Pay special
attention to the transducer front and the flame
path section.
B. Make sure that the Transducer is not subjected to water ingress
or mechanical damage while dismounted.
C. While the Transducer is removed, one must inspect the inside
of the nozzle for damages, grease or pollution from the process.
Pollutions must be removed using suitable tools and liquids,
preferably isopropanol.
CAUTION: If any damage is discovered to the nozzle, this
Transducer Nozzle must be clearly marked such
that the Transducer Retraction Tool is NOT used
on this specific nozzle. This must also be reported
to the one responsible for the MPU.
Picture 5 Transducer with O-rings and Back-up rings mounted

MPU Transducer Replacement Procedure
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Kongsberg MPU Mounting Procedure
Ultrasonic Gas Flow Meter
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MNKS024 Page 17 of 31
3. MOUNTING PROCEDURE
3.1. Pre-mounting Procedure
Before starting the mounting procedure, the following procedure
must be performed:
3.1.1. Cleaning
Pollutions must be removed using suitable tools and liquids,
preferably isopropanol.
3.1.2. Visual Inspection
•Inspect the inside of the nozzle for damages, grease or pollution
from the process.
•Transducers with O-rings and Back-up rings.
•Tolerances for Fastening Cover mounting.
3.1.3. Assumptions
It is assumed that the Transducers are zero calibrated.

MPU Transducer Replacement Procedure
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Page 18 of 31 MNKS024 Rev. B
3.2. Mounting, Short Form
CAUTION: Make sure the Transducers are mounted in correct
position according to the calibration certificate.
A. Replace o-rings and back-up rings. Use silicon grease on O-
rings and copper grease (e.g. Copaslip) on the screws.
B. Check the nozzle internals, clean it before mounting.
C. Mount the Fastening Cover to the Spool Piece.
CAUTION: Make sure that the flamepaths (see Figure 4, pos.
no. 15, 16, 17) do not have any damage. If so, the
part must be replaced.
D. Carefully insert the Transducer into the Nozzle.
E. Mount the Cable Gland (EU) or Conduit (US) into the End
Cover.
F. Connect the Transducer Cable Connector.
G. Mount the End Cover onto the Fastening Cover.
H. Change Transducer nameplate if the Transducer has been
replaced.
I. Mount the optional mechanical protection.
J. Update the database if transducers are replaced.
CAUTION: The screws must be of required quality, the
threads must be lubricated and correct torque
must be used (ref section 3.3 and 3.6).
CAUTION: Make sure to measure the ohm resistance between
Transducer Cables and bonding if transducers are
replaced.

Kongsberg MPU Mounting Procedure
Ultrasonic Gas Flow Meter
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MNKS024 Page 19 of 31
Figure 4 Transducer Mounting
ITEM NAME, TYPE, DIMENSION
1 Spool Piece
2 Nozzle
3 Transducer Assy.
4 O-ring 18.77x1.78
5 Back-up ring 19.4x22x1.2
6 Fastening Cover
7 Locking Screw
8 O-ring 6.5x1.5
9 Back-up ring 6.6x9x1
10 End Cover
11 O-ring 34x2
12 O-ring 25.12x1.78
13 Back-up ring 26.2x29x1.4
14 O-ring 22x2
15 Flamepath Transducer
16 Flamepath End Cover
17 Flamepath threads for Eex d Gland

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Page 20 of 31 MNKS024 ev. B
3.3. Mounting the Fastening Cover
A. Remove the old O-rings.
B. Make sure that the mating faces are clean. When cleaning a
joint face, use a tool which is not likely to score or damage the
face, and remove any burrs or nicks with an oilstone or fine file.
C. Replace the O-ring on the Fastening Cover. Put silicon grease
on the new O-ring.
D. Remove the Seeger rings on the Fastening Cover. Remove the
Locking Screws and replace the O-rings and the Back-up rings.
Put silicon grease (Gleitmo 750 or equivalent) on the new O-
rings.
E. Mount the Locking Screws and the Seeger rings.
Mount the Fastening Cover and fasten the bolts. Use copper
grease (e.g. Copaslip) on the bolt threads.
CAUTION: Required torque is 22 Nm!
F. Put the Locking Screws in their outer position if the Transducer
is not mounted.
Picture 6 Fastening Cover Parts