MS244
0508
0003
POSITIVE DISPLACEMENT FLOW METERS
M50 Pulse; M50 Standard LCD; M50 Deluxe LCD; From serial No.CXXXX
M50 ST. STEEL 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 Pulse outputs
and Liquid Crystal Displays. Each model with
a Liquid Crystal Display has an additional LCD
instruction manual supplied. 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. With
low pressure drop and high pressure rating oval
rotor flow meters are suitable for both gravity and
pump (in line)
applications.
The M50 series meters are available in either
Aluminium, Bronze or Stainless Steel. Standard
rotors are also made from PPS with optional 316
Stainless Steel rotors available for both SS and
Aluminium models.
Meters are available with either;
* Pulse output
* Standard LC Display and Pulse
* Deluxe LC Display and Pulse
IMPORTANT INFORMATION
PLEASE READ THIS INFORMATION
CAREFULLY BEFORE USE!
Before use, confirm the fluid to be used is compatible
with the meter. Refer to industry fluid compatibility
charts or consult your local representative for
advice.
To prevent damage from dirt or foreign matter it is
recommended that a Y or Basket type 60 mesh
strainer be installed as close as possible to the
inlet side of the meter. Contact your local
representative for advice.
Note: When a strainer is installed it should be
regularly inspected and cleaned. Failure to keep
the strainer clean will dramatically effect flow
meter performance.
Note: To prevent damage caused by air purge slowly
fill the meter with fluid. To reduce pressure build up
turn off the pump at the end of each day.
Maintenance can be carried out to the liquid crystal
displays and pulse units without removing or
isolating the meter from the line. When
maintenance to any other part of the meter is
required, the meter must be isolated and the line
pressure reduced.
The reed switch pulse unit can cause inaccurate
rate counts when used with high speed counters. It is
advised that a debounce circuit be used. Contact your
meter distributor for further information.
OPERATING PRINCIPLE
When fluid passes through the meter the rotors
turn, as shown below. The magnets which are
located in the rotors will pass across the pulser circuit
board (containing either Reed switches or Hall
Effect sensors). A signal is generated which is
then sent by the Pulse Circuit Board (PCB) to
the relevant LC display or receiving instrument.
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.
3) For pump applications ensure pipe work has
the appropriate working pressure rating to match the
pressure output of the pump.
See Meter Specifications section for further details.
4) Install a wire mesh strainer (Y or basket type 60
mesh 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.
Note: Incorrect installation can cause
premature wear of meter components.
7) Do not over tighten meter connections.
8) It is important that after initial installation you
fill the line slowly, high speed air purge could
cause damage to the rotors.
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.
ELECTRICAL CONNECTIONS
SERVICE INSTRUCTIONS
Disassembly
Ensure that the fluid supply to the meter is
disconnected, and the line pressure is released
before disassembly, with the exception for repair or
maintenance to the LC Display or PCB where
there is no necessity to isolate the meter from flow.
Refer to the exploded parts diagram on subsequent
pages for item numbers.
1a) Pulse Caps models: Undo the conduit
connector, remove pulse cap (item 9) and
remove the wires from the pulse terminal board
(item 5).
1b) Standard LC Display: Mark the display
orientation with a marking pen, unscrew the four
large screws (Item 26) on top of the LC Display.
Carefully separate the LC Display from the
plastic housing and disconnect the wires from
the pulse terminal block. (Refer to additional
Standard LC Display
instruction manual).
1c) Deluxe LC Display: Mark the display
orientation with a marking pen, remove the four
retaining screws on the display face (Item 16).
Lift off the display unit and remove the 9 pin
connector at the back of the display unit. (Refer
to additional Deluxe LC Display instruction
manual).
2) Remove the mounting adaptor plate and gasket
(Item 14).
3) Loosen the cap head screws (Item 7) that hold
down the meter cap (Item 4), remove the screws,
washers and lift off the cap.
4) Remove the o’ring (Item 2) from the o’ring groove
in the meter cap (Item 4).
5) Remove rotors (Item 3). Note the position of
the timing marks.
Reassembly
3) Replace the rotors (Item 3) onto the shafts at 90dgr
to each other (refer Fig. 5). Check the operation of the
rotors by turning either by hand. If the rotors are
not in mesh correctly or do not move freely,
remove one of the rotors and replace correctly at
90dgr to the other rotor.
Re-check the operation of the rotors.
4) Replace the o’ring (Item 2) into groove in the
meter cap, if the o’ring has grown or is damaged in any
way replace it with a new part.
5) Replace the meter cap making sure that the locating
pin in the body lines up with the hole in the meter cap.
Insert the cap head screws (Item 7) and tighten in
a diagonal sequence 1, 3, 2, 4, etc.
6) The replacement of cables and connectors are a
reversal of the disassembly procedure, replace
conduit fitting if required.
When replacing the Standard LC Display or the Deluxe
LC Display, confirm the orientation marks made on
disassembly are aligned then screw the register into
place.
7) Test the meter by turning the rotors with a finger
or by applying very low air pressure (no more than a
good breath) to one end of the meter, before
returning the meter to the line.
Pulse Circuit Board (PCB) Notes:
The pulse PCB (Item 5) is fitted with (A) two reed
switches; (B) hall effect sensors; or (C) one reed
switch and one hall effect sensor.
The PCB board is fastened to the meter cap
(Item 4) by two screws and stand off’s.
All care and caution should be taken when
removing or handling the PCB as both the reed switch
and hall effect sensor are fragile.
Reed switch or hall effect sensors are not available
as individual replacement parts and are only
available with the complete PCB (Item 5).
1) Before reassembling check the condition of
the rotors (replace if necessary).
2) Check that the plug side of the rotors is facing
you when inserting the rotors, the plug side of
the rotor is the magnet side.
There is no difference between rotor one or
rotor two.
METER PARTS LISTING
DISPLAY PARTS LISTING
METER SPECIFICATONS
METER TROUBLE SHOOTING
15 to 350/4 to 93
30 to 300/8 to 79
15 to 350/4 to 93
30 to 300/8 to 79
15 to 350/4 to 93
30 to 300/8 to 79
METER DIMENSIONS
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.
WARRANTY
Macnaught Pty Ltd
PO Box 90 Arncliffe NSW 2205 Australia
Telephone (02) 9567 0401
Facsimile (02) 9597 7773
Email: sales@macnaught.com.au
Web: www.macnaught.com.au
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