Macnaught M50 ST. STEEL SERIES User manual

MS244
0508
0003
POSITIVE DISPLACEMENT FLOW METERS
M50 Pulse; M50 Standard LCD; M50 Deluxe LCD; Fro serial No.CXXXX
M50 ST. STEEL SERIES INSTRUCTION MANUAL
TO THE OWNER
Please take a few inutes to read through
this anual before installing and operating
your eter. Always retain this anual for future
reference.
If you have any proble s with the eter, refer
to the aintenance and trouble shooting
sections of this anual.
This anual contains connection and operating
instructions for eters with Pulse outputs
and Liquid Crystal Displays. Each odel with
a Liquid Crystal Display has an additional LCD
instruction anual 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 ethod of
easuring 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 eters are suitable for both gravity and
pu p (in line)
applications.
The M50 series eters are available in either
Alu iniu , Bronze or Stainless Steel. Standard
rotors are also ade fro PPS with optional 316
Stainless Steel rotors available for both SS and
Alu iniu odels.
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 industr fluid compatibilit
charts or consult our local representative for
advice.
To prevent damage from dirt or foreign matter it is
recommended that a Y or Basket t pe 60 mesh
strainer be installed as close as possible to the
inlet side of the meter. Contact our local
representative for advice.
Note: When a strainer is installed it should be
regularl inspected and cleaned. Failure to keep
the strainer clean will dramaticall effect flow
meter performance.
Note: To prevent damage caused b air purge slowl
fill the meter with fluid. To reduce pressure build up
turn off the pump at the end of each da .
Maintenance can be carried out to the liquid cr stal
displa s and pulse units without removing or
isolating the meter from the line. When
maintenance to an 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 our
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 b the Pulse Circuit Board (PCB) to
the relevant LC displa or receiving instrument.
INSTALLATION
1) It is recommended that when setting up pipe work
for meter installations a b pass line be included in the
design. This provides the facilit 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 t pe 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 bod .
6) The meter can be installed in an orientation as
long as the meter shafts are in a horizontal plane.
(Refer to Fig.2 for correct installation)
The register assembl ma be orientated to suit the
individual installation.
Note: Incorrect installation can cause
pre ature wear of eter co ponents.
7) Do not over tighten meter connections.
8) It is important that after initial installation ou
fill the line slowl , high speed air purge could
cause damage to the rotors.
9) Test the s stem for leaks.
10) Check the strainer for swarf or foreign
material, after the first 200 litres check
periodicall , particularl if the flow rate
decreases.
ELECTRICAL CONNECTIONS

SERVICE INSTRUCTIONS
Disasse bly
Ensure that the fluid suppl to the meter is
disconnected, and the line pressure is released
before disassembl , with the exception for repair or
maintenance to the LC Displa or PCB where
there is no necessit to isolate the meter from flow.
Refer to the exploded parts diagram on subsequent
pages for item numbers.
1a) Pulse Caps odels: 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 displa
orientation with a marking pen, unscrew the four
large screws (Item 26) on top of the LC Displa .
Carefull separate the LC Displa from the
plastic housing and disconnect the wires from
the pulse terminal block. (Refer to additional
Standard LC Displa
instruction manual).
1c) Deluxe LC Display: Mark the displa
orientation with a marking pen, remove the four
retaining screws on the displa face (Item 16).
Lift off the displa unit and remove the 9 pin
connector at the back of the displa unit. (Refer
to additional Deluxe LC Displa 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.
Reasse bly
3) Replace the rotors (Item 3) onto the shafts at 90dgr
to each other (refer Fig. 5). Check the operation of the
rotors b turning either b hand. If the rotors are
not in mesh correctl or do not move freel ,
remove one of the rotors and replace correctl 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 an
wa replace it with a new part.
5) Replace the meter cap making sure that the locating
pin in the bod 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 disassembl procedure, replace
conduit fitting if required.
When replacing the Standard LC Displa or the Deluxe
LC Displa , confirm the orientation marks made on
disassembl are aligned then screw the register into
place.
7) Test the meter b turning the rotors with a finger
or b appl ing ver 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) b 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 onl
available with the complete PCB (Item 5).
1) Before reassembling check the condition of
the rotors (replace if necessar ).
2) Check that the plug side of the rotors is facing
ou 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 Pt Ltd warrants that the Products will be free from an defects caused b fault
material or workmanship for a period of Twent Four (24) months from the date of sale of the
Products to the end user (the ‘Warrant Period’) PROVIDED THAT, during the Warrant Period:
1. Macnaught receives notice setting out full details of an defect in an 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 b its inspection or
refund the price paid b the end user for that Product.
Macnaught liabilit and the end user’s rights under this warrant shall be limited to such repair,
replacement or refund and, in particular, shall not extend to an direct, special, indirect or
consequential damage or losses of an nature.
Note:
This warrant does not form part of, nor does it constitute, a contract between Macnaught
and the end user. It is additional to an warrant given b the seller of the Products and does
not exclude, limit, restrict or modif the rights and remedies conferred upon the end user, or the
liabilities imposed on the seller, b an statute or other laws in respect of the sale of the Product.
WARRANTY
Macnaught Pt Ltd
PO Box 90 Arncliffe NSW 2205 Australia
T elephone [phone]
F acsimile [phone]
Email: sal es@ macnaught.com.au
Web: www. macnaught.com. au