Pre-Installation Checks; Operating Principle; Installation Procedure - Macnaught M Series Instruction Manual

Important Information
WARNING
Before use, confirm the fluid to be used is com-
patible with the meter. Refer to Industry fluid
compatibility charts or consult your local rep-
resentative for advice.
To prevent damage from dirt or foreign matter it is
recommended that a Y or Basket type 200 mesh
strainer be installed as close as possible to the
inlet side of the meter. Contact your local repre-
sentative for advice.
CAUTION
When a strainer is installed it should be reg-
ularly inspected and cleaned. Failure to keep
the strainer clean will dramatically effect flow
meter performance.
CAUTION
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 isolat-
ing 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 Procedure

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 interrupt
ing production. (see figure above)
2. Use a thread sealant on all pipe threads.
Caution: Thread tape must not enter flow meter,
stopping flow meters operation.
3. For pump applications ensure pipe work and
Meter have the appropriate working pressure
rating to match the pressure output of the pump.
Refer to Meter Specifications section for further
details.
4. Install a wire mesh strainer, Y or basket type
as close as possible to the inlet side of the meter.
Meter 1/4‖ 74 micron / 200 mesh
5. Note: The Flow meter can accept flow in any
direction.
6. The meter can be installed in any orientation as
long as the meter shafts are in a horizontal plane.
(Refer to diagram below for correct installation)
.
Note: Incorrect installation can cause premature
wear of meter components.
The orientation of the LC display can be changed
by loosening the 4 mounting screws.
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 is noted to be
decreasing.
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