Macnaught M50 SERIES User manual

MS365
0708
0004
POSITIVE DISPLACEMENT
FLOWMETERS
M50 Mechanical meter; From erial No.CXXXX
M50 SERIES INSTRUCTION MANUAL
TO THE OWNER
Please take a few minutes to read through this
manual before installing and operating your
meter
Always retain this manual for future reference
If you have any problems with the meter, refer
to the maintenance and trouble shooting sections
of this manual
This manual contains connection and operating
instructions for meters with mechanical displays
If you need further assistance, contact your local
representative or distributor for advice
This Flow Meter has incorporated the oval rotor
principal into its design This has proven to be a reliable
and highly accurate method of measuring flow
Exceptional repeatability and high accuracy over a
wide range of fluid viscosities and flow rates are
features of the oval rotor design The low pressure
drop and high pressure rating means oval rotor flow
meters are suitable for both gravity and pump (in line)
applications
Flow meters are available in either Aluminium or
316 Stainless Steel Standard rotors are made from
PPS (Polyphenylene Sulfide Resins) with optional
316 Stainless Steel rotors available for both
Stainless steel and Aluminium models
Mechanical displays have a re-settable batch totaliser
and non-re- settable accumulative totaliser

IMPORTANT INFORMATION
Before u e, confirm the fluid to be u ed i
compatible with the meter. Refer to Indu try
fluid compatibility chart or con ult your local
repre entative for advice.
To prevent damage from dirt or foreign matter it
i recommended that a Y or ba ket type 60
me h trainer be in talled a clo e a po ible
to the inlet ide of the meter. Contact your
local repre entative for advice.
Note: When a trainer i in talled it hould be
regularly in pected and cleaned. Failure to
keep the trainer clean will dramatically effect
flow meter performance.
Note: To prevent damage cau ed by air purge
lowly fill the meter with fluid. To reduce pre ure
build up turn off the pump at the end of each day.
When maintenance to any other part of the meter
i required, the meter mu t be i olated and the
line pre ure reduced. Contact your meter
di tributor for further information.
OPERATING PRINCIPLE
When fluid passes through the meter the rotors
turn, as shown below The gear located on top of
one of the rotors drives the mechanical registers gear
train which provides an accurate readout
INSTALLATION
1) It is recommended that when setting up pipe work
for meter installations a bypass line be included in
the design This provides the facility for a meter to be
removed for maintenance without interrupting
production (See Fig 1)
2) Use thread sealant on all pipe threads For
flanged versions appropriate companion flanges and
gaskets are required
3) For pump applications ensure pipe work has
the appropriate working pressure rating to match
the pressure output of the pump
4) Install a wire mesh strainer (Y or basket type)
as close as possible to the inlet side of the meter.
5) Ensure that the meter is installed so that the
flow of the liquid is in the direction of the arrows
embossed on the meter body
6) The meter can be installed in any orientation
as long as the meter shafts are in a horizontal
plane (Refer to Fig 2 for correct installation) The
register assembly may be orientated to suit the
individual installation
7) Do not over tighten meter connections
Note: Incorrect in tallation can cau e
premature wear of meter component .
8) It i important that after initial in tallation
you fill the line lowly, high peed air purge
could cau e damage to the rotor .
9) Test the system for leaks
10) Check the strainer for swarf or foreign material,
after the first 200 litres check periodically,
particularly if the flow rate decreases
PLEASE READ THIS INFORMATION
CAREFULLY BEFORE USE!

SERVICE INSTRUCTIONS
Di a embly
Ensure that the fluid supply to the meter is
disconnected, and the line pressure is released
before disassembly
Refer to the exploded parts diagram on subsequent
pages for item numbers
Rea embly
1) Clean all components before reassembly
2) Before reassembly check the condition of
the rotors (Item 3) Replace if necessary
3) Replace the rotor (with the gear) on the short shaft
in the housing then place the 2nd rotor onto the
shaft so as the rotors are at 90° to each other (Refer
Fig 3) Check rotor operation by turning either of
the rotors If the rotors are not in mesh correctly or
do not move freely remove one of the rotors and
replace it correctly at 90° to the other rotor
Recheck the operation of the rotors
4) Inspect the gears (Item 6) in the meter cap
(Item 4) for wear (Replace if required, refer to
spare parts on page 5)
5) Replace the o-ring (Item 2) into the groove in the
meter cap, if the o-ring has been distorted or
is damaged in any way replace it with a new part
6) Replace the meter cap, making sure the locating
pins line up with the holes in the meter cap and the
gear on the rotor meshes correctly with the gear in
the meter cap (Item 4) Insert the allen screws (Item
5) and tighten in the sequence 1, 4, 2, 5, 3, 6
8) Replacement of output haft, bu h and eal
(a per “Di a embly” and “A embly” procedure
below).
Di a embly
a Remove the bevel gear
b Remove the circlip and push out the output shaft
assembly, including washers (Items 7, 8, 9)
c Remove the seal
d Carefully press out the output shaft bush (If
required)
A embly
Fig 3
7) Inspect the bevel gear (Item 13), o- ring (Item 10),
and output gear (Item 7) for wear or damage
(Replace faulty components if necessary)
1) Remove the four screws (Item 17) located on
the face of the register
Then remove the face plate cover including
register assembly
2) Remove the four register mounting screws (Item
15) Then remove the lower half of the register
housing
3) Remove the six cover plate screws (Item 12) and
remove the cover plate (Item 11)
4) Remove the eight meter cap screws (Item 5) and
remove the meter cap (Item 4)
5) Remove rotors (Item 3)
a Carefully press the new output shaft bush into
place (Use Loctite Primer 747, as per instructions,
followed by sealant Loctite 262)
b Insert a new seal into the groove of the output shaft
bush
c Replace the output gear and washer and
replace the circlip to lock the output gear shaft into
place
d Replace the bevel gear (Item 13) and tighten the
grub screw onto flat face of shaft
9) Place the o-ring (Item 10) into the groove in
the cover plate (Replace the o-ring seal if required)
10) Place the cover plate onto the meter
Replace the cover plate screws and tighten the six
cap head screws (Item 12) firmly
11) Place the lower cover plate of the register into
position Replace the four screws (Item 15) and
tighten
12) Position the register correctly on top of the lower
register cover Replace the four screws (Item 17)
and tighten
13) Test the meter by turning the rotors with a finger or
by applying low air pressure (No more than a good
breath) to one end of the meter, before returning
meter to the line

METER TROUBLE SHOOTING
HEATING JACKETS

METER PARTS LISTING

METER PARTS LISTING
METER DIMENSIONS
METER SPECIFICATONS
15 to 350/4 to 93
30 to 300/8 to 79

NOTES:

WARRANTY
Macnaught Pty Ltd warrants that the Products will be free from any defects caused by faulty
material or workmanship for a period of Twenty Four (24) months from the date of sale of the
Products to the end user (the ‘Warranty Period’) PROVIDED THAT, during the Warranty Period:
1 Macnaught receives notice setting out full details of any defect in any product and details of the
time and place of purchase of the Product: and
2 the end user, at its own cost returns the Product to the nearest authorised Macnaught Service
Centre
Macnaught shall, as its option repair or replace and Product found defective by its inspection or
refund the price paid by the end user for that Product
Macnaught liability and the end user’s rights under this warranty shall be limited to such repair,
replacement or refund and, in particular, shall not extend to any direct, special, indirect or
consequential damage or losses of any nature
Note:
This warranty does not form part of, nor does it constitute, a contract between Macnaught
and the end user It is additional to any warranty given by the seller of the Products and does
not exclude, limit, restrict or modify the rights and remedies conferred upon the end user, or the
liabilities imposed on the seller, by any statute or other laws in respect of the sale of the Product
Macnaught Pty Ltd
PO Box 90 Arncliffe NSW 2205 Australia
Telephone [phone]
Facsimile [phone]
Email: sales@macnaught com au
Web: www macnaught com au