MS244G
0899
0001
Positive Displacement Flowmeters
GM50 series instruction manual
GM50 Pulse • GM50 Standard LCD • G540 Deluxe LCD • From serial No. CXXXX
Thank you for purchasing a GPI GM
Series Flow Meter. Please take a few
minutes to read through this manual
before installing and operating your
meter. 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 the M50
Series meters with pulse outputs and
liquid crystal displays. For models
with deluxe liquid crystal display an
additonal instruction manual is
supplied. If you need further
assistance, contact your local GPI
representative or contact GPI by
telephone or fax.
The GPI GM Series 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 GM
Series flow meter design. The low
pressure drop and high pressure rating
means the GM Series flow meter is
suitable for both gravity and pump (in
line) applications.
The GPI GM Series flow meters are
available in either aluminum 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 aluminum models.
The M50 Series is available with
either;
* Standard Pulse
* Standard LC Display and Pulse
* Deluxe LC Display and Pulse
PLEASE READ THIS INFORMATION
CAREFULLY BEFORE USE!
Before use, confirm the fluid to be used
is compatible with the meter (refer to
the GPI fluid compatibility chart), or
consult your local GPI representative
for advice.
This meter will handle particle sizes up
to 0.4mm/0.016”.
To prevent damage from dirt or foreign
matter, GPI recommends a Y or Basket
type 60 mesh strainer be installed as
close as possible to the inlet side of the
meter (if required contact GPI for
further information).
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.
To prevent damage to the meter slowly
fill the system with fluid (this will
prevent damage caused by air purge).
Note: Failure to do this could damage
the meter.
For pump applications, 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 or
alternatively use the hall effect sensor
option.
PTB - Deluxe LC Display
EEX1A IIC T6 (PTBnr EX-93.C4033X)
1
To the owner
Important Information
1] GPI recommends that when setting
up pipework 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 2”
ANSI 150lb or DIN16, 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. The maximum
working pressures are;
2” flanged stainless steel or aluminum
series. See appropriate ANSI/DIN
flange rules.
4] Install a wire mesh strainer (Y or
basket type 40 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.
2
Installation
When fluid passes through the meter,
rotors turn. 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 received which is
then sent by the Pulse Circuit Board
(PCB) to the relevant LC display or
receiving instrument.
Operation
1
2
Bypass Line
Flow Outlet
Flow Inlet
Strainer
Do Not Install Meter This Way
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 pages 7 and 8 for item
numbers.
1a] Units with Pulse Caps; 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 30) on top of the LC Display.
Carefully separate the LC Display
from the plastic housing and
disconnect the wires from the
Reed Switch Connections for PCB Terminals - refer Fig.3
Hall Effect Sensor Connections - refer Fig.4
3
Electrical Connections
Service Instructions
3
Contact rating 15VA
Maximum Voltage 150VDC
Configuration 1
2 x pulse outputs
Configuration 2
Link 2 & 3 for double
pulse output
LCD Versions
1 x Hall Effect Sensor
1 x Reed Switch
1 - Reed Switch
2 - Reed Switch
3 - HE Common 4 - HE Signal
5 - HE Supply +
Pulse V
ersions Only
2 x Hall Effect Sensor
1 - HE Supply +
2 - HE 1 Signal
3 - HE Common 4 - HE 2 Signal
5 - HE Ground
4
Hall Effect Voltage 4.5 to 24 VDC
Current Draw Minimum 4.6mA
Output NPN Open Collector 25mA
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