Dwyer Instruments FLMG-06-GM-GAL-H-15, FLMG-06-LM-LIT-H-15, FLMG-08-LM-LIT-H-15, FLMG-04-GM-GAL-H-15, FLMG-10-GM-GAL-H-15 User manual
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SERIES FLMG
MUNICIPAL/INDUSTRIAL MAGMETER
INSTRUCTIONS
F-FLMG
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TABLE OF CONTENTS
General Information
General Information, Features ................................................................................................... Page 1
Specications
Specications, Flow Range ............................................................................................................ Page 2
Installation and Grounding
Positioning the Meter,
Calibration, Chemical Injection, Metal Pipe Installations, Plastic Pipe Installations....................... Page 3
Straight Pipe Recommendations ................................................................................................ Page 4
Full Pipe Recommendations ...................................................................................................... Page 5
Inputs/Outputs and Operation
Power, Pulse Output, High Frequency Output/K-Factor, Display Reading ................................................... Page 6
Connections Diagrams
BAT/FLMG, RTI/FLMG .............................................................................................................. Page 7
Straight Pipe Recommendations, Full Pipe Recommendations, Fittings,
Troubleshooting
Problem, Probable Cause, To Try .................................................................................... Page 8
TABLES, DIAGRAMS & CHARTS
Features ...................................................................................................................................Page 1
Specifications .......................................................................................................................... Page 2
Flow Range ............................................................................................................................. Page 2
Metal Pipe Installation, Plastic Pipe Installation ..................................................................... Page 3
Straight Pipe Recommendations ............................................................................................. Page 4
Full Pipe Recommendations .................................................................................................... Page 5
High Frequency Output/K-Factor ............................................................................................................. Page 6
Display Readings ..................................................................................................................... Page 6
Connections Diagrams ............................................................................................................. Page 7
Troubleshooting ......................................................................................................................... Page 8
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GENERAL INFORMATION
The Series FLMG is a anged electromagnetic owmetersfor
use in 4” to 10” pipe in municipal or industrial water and
wastewater applications where propeller meters have typically
been used in the past. Because the FLMG has no moving
parts and has electrodes designed to discourage fouling, this
magmeter performs well and requires much less frequent
maintenance in applications where debris or sand would
impede propeller meters. There is no rotor to stop turning
or bearings to wear out. Minimal straight pipe requirements
allow FLMG Series meters to be used in piping congurations
where there is little space between the meter and an elbow.
In chemical injection applications, the meter should be placed
upstream of the injection line or far enough downstream for
thorough mixing to occur before the meter.
Rate and total indication are standard on both models. Flow
measurement units are customer-selected and factory-set
and can only be changed in the eld by an authorized agent.
The Series FLMG is externally powered with 7-26 VDC at 30
mA max (see WARNING on Wiring Diagrams). Two Lithium
3.6V “AA” batteries provide backup during power failures,
allowing the meter to seamlessly continue recording ow rate
and total for the duration of the outage. Under intermittent
use, the battery life is approximately 10 years.
The 20-foot power cable also provides pulse output for use
with a variety of Dwyer Instruments Inc. and other displays
and controls for remote reading, data logging, pulse-toanalog conversion, and telemetry applications. An internal
data logger is also available for secure ow logging. Pulse
rate is customer-selected and factory-set and can only be
changed in the eld by an authorized agent. Default is high
frequency for use with 4 to20 mA signal conversion devices.
FEATURES
Rate and total indicator
Powder-coated diecast-aluminum electronics housing
Power/Output cable
Internal Data Logger (Optional)
Welded steel epoxy-coated ow tube
316 SS electrodes
Dual durometer rubber liner
Flanges, ANSI 150 lb drilling
Equalization lug
4” 6” 8” 10”
Gal/Min Liter/Sec Gal/Min Liter/Sec Gal/Min Liter/Sec Gal/Min Liter/Sec
12 .75 32 2 60 3.8 95 6
500 31.5 1,200 75.7 2,200 138.8 3,500 220.8
Page 1
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SPECIFICATIONS
SPECIFICATIONS*
Pipe Sizes
Flanges
Pressure
Temperature Operating
Accuracy
Materials Body
Liner
Electronics Housing
Electrodes
Display
Digits
Units
Power
Pulse Output Signal
High Frequency
(pulse/gal)
Conductivity
Empty Pipe Detection
Environmental
*Specications subject to change.
Non-Operating
Pulse Rates
4”, 6”, 8”, 10”
ANSI 150 lb drilling
150 psi (10.3 bar) working pressure
10˚ to 130˚ F (-12˚ to 54˚ C)
-40˚ to 158˚ F (-40˚ to 70˚ C)
+/- 1% of reading for ow between 10% to 100% of max ow
+/- 2% of reading for ow from cutoff to 10% of max ow
Welded steel, epoxy-coated
Dual durometer rubber
Diecast aluminum, powder-coated
316 SS
Rate
5 8
Gallon/Minute, Liter/Minute, Liter/Second, Gallon, Gallon x 1000, Liter, Liter x 1000, Mega Liter,
Cubic Feet/Minute, Cubic Meter/Hour, Cubic Meter, Cubic Meter x 1000, Cubic Feet,
Million Gallon/Day, Mega Liter/Day Cubic Feet x 1000
7-32 Vdc at 30 mA max, with auxiliary battery for continuous operation during power failures
NOTE: Using an unregulated power supply >18 Vdc may damage the meter due to AC line input voltage uctuation
Current sinking pulse, opto-isolated, 30 Vdc at 10 mA max
High Frequency (default); 10 units/pulse; 100 units/pulse; 1000 units/pulse
4” 6” 8” 10”
16.362 6.307 3.344 2.150
>20 microSiemens/cm
Hardware/software, conductivity-based
NEMA 4X (IP66)
Total
FLOW RANGE
Minimum
Maximum
Page 2
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INSTALLATION and GROUNDING
INSTALLATION
Caution: These ow sensors are not recommended
where installation fault may expose the ow sensor to boiler pressure and temperature. Maximum
recommended temperature is 130˚ F.
Positioning the Meter. These meters can be installed
horizontally, vertically, and in any radial position.
Straight Pipe Recommendations. As with most flow
meters, the FLMG requires some straight pipe before and
after the meter for best accuracy. However, the ability of
electromagnetic meters to average the ow across the entire
pipe allows for shorter straight pipe recommendations than
most mechanical meters (see page 4).
Full Pipe Recommendations. All magmeters require a
method for determining that the pipe is empty, to prevent false
reading. This meter is designed to go to zero reading if one
or more electrodes is exposed. For highest accuracy, install
the meter so that the pipe will be full when there is ow. If air
bubbles may be present in the pipe or sludge accumulation
is an issue, rotate the meter by one ange hole to position
the control housing at a 45˚ angle (see diagrams on page 5).
EQUALIZATION AND GROUNDING
Metal Pipe Installations. To equalize the electrical potential
of the uid, the FLMG meter, and the surrounding pipe, secure
the ange plates (factory-installed on the equalization lug) to
both pipe anges at one of the bolt holes, as shown below.
Be sure the lockwasher ts between the pipe ange and the
ange plate.
Meter Flange
Pipe Flange
Lockwasher
Flange Plate
Equalization Lug
Metal
Pipe
Meter
Flange
Bolt
Pipe
Flange
Metal
Pipe
Equalization Diagram
Run wire from equalization lug to both pipe anges;
secure ange plates under bolt heads as shown.
Fittings. The FLMG anges have standard ANSI 150 lb drilling
and mate with any other ANSI 150 lb ange.
Calibration. The FLMG is factory-calibrated and will not require
any form of eld calibration.
Chemical Injection. When any magmeter, by any manufacturer, is used in a chemical injection application, the chemical
injection point must be placed downstream of the magmeter OR far enough upstream for complete mixing to occur
before the uid reaches the meter. When unmixed chemical
alternates with water passing through the meter, the rapid
changes in conductivity may cause sudden spikes and drops
in the meter’s reading, resulting in inaccurate measurement.
The magmeter will restabilize, however, with a steady ow of
uid of uniform conductivity.
Caution: In chemical injection applications, install chemical injection
point downstream of magmeter, or far
enough upstream to allow complete
mixing of uids before the meter.
WARNING: ELECTRICAL SHOCK HAZARD When
the meter is externally AC powered, the piping system must be grounded to meet national and local
electrical safety codes. Failure to do so can result
in electrocution.
Plastic Pipe Installations. When the FLMG is installed in a
plastic piping system, it is not necessary to use the equalization straps, but very important to ground the meter to avoid
electrical shock hazard and electrostatic interference with
meter function.
Page 3
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STRAIGHT PIPE RECOMMENDATIONS
(X = diameter)
Reduced Pipe
Two Elbows In Plane
Two Elbows, Out Of Plane
1X
2X
FLMG
1X
2X
FLMG
1X
2X
Expanded Pipe
Swirling Flow
Propeller Meter
5X
5X
FLMG
FLMG
5X
1X
1X
FLMG
1X
Swirling Flow
Partially Open
FLMG
Buttery Valve
Page 4
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FULL PIPE RECOMMENDATIONS
Recommended:
Keeps pipe full at meter for accuracy
FLMG
FLMG
Not Ideal:
Allows air pockets to form at meter
FLMG
Recommended:
Keeps pipe full at meter for accuracy
FLMG
Recommended:
Allows air to bleed off
Intermittent air
Electrode
moved from
top by rotating
meter
FLMG
miss electrode
Electrodes free
from sediment
bubbles
build-up
FLMG
Not Ideal:
Post-valve cavitation can create air pocket
FLMG
Not Ideal:
Air can be trapped
Intermittent air
bubbles
pass over
electrode
Possible
sediment
build-up
FLMG
Recommended:
Improved accuracy results from
unimpeded electrodes
Air bubbles and sediment on the
electrodes can affect accuracy
Not Ideal:
Page 5
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INPUTS/OUTPUTS and OPERATION
Power.
The FLMG operates on 8-32 VDC at 30 mA max external power
(see WARNING in wiring diagrams). The display reads “P” when
external power is in use (see illustration below).
The Lithium battery pack installed in the FLMG serves as
backup in the event of a power failure, when it will keep the
meter operating without interruption for the duration of the
outage. When battery power in is use, the FLMG display
continues to read out the rate and total, but the “P” indicating
external power is extinguished. When power resumes, the
FLMG will seamlessly return to normal power mode, and the
“P” will again display.
When used for occasional emergency backup, battery life is
approximately ten years.
Pulse Output. The FLMG cable also provides pulse output that
can be used for remote reading, 4-20 mA signal conversion,
datalogging, and telemetry applications. See page 7 for
connection diagrams to Dwyer Instruments Inc. controls and
displays.
OPERATION
Caution: There are no user-adjustable
connections or settings inside the display
housing. Use caution when opening the
housing for a battery change, to avoid
damage to internal components.
Display Reading. The FLMG display has two lines, the bottom
line for ow rate and the top line for accumulated total.
Measurement units are pre-ordered and factory-set and can
be changed in the eld only by an authorized individual.
Refer to the diagrams below to read your display.
Note: For data logger setup and operation, refer to Flow
Inspector Manual
Pulse rates are selected by the customer at time of order,
factory-set.Three pulse rates are possible: One pulse per ten
gallons (or liters), one pulse per thousand gallons (or liters), or
High Frequency (required for use with 4 to 20 mA converters;
see below):
High Frequency Output/K-Factor
Meter Size Pulses per Gallon Pulses per Liter
4” 16.362 4.323
6” 6.307 1.666
8” 3.344 0.883
10” 2.150 0.568
External Power Indicator
Backup Operation
Meter Installed Backwards
No Power
Empty Pipe
Page 6
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CONNECTIONS DIAGRAMS (WMX101)
The FLMG requires a power source of 8-32 VDC at 30 mA
max (see WARNING). The power cable also serves as a pulse
output if needed for remote reading, data logging, signal
conversion, or telemetry.
Series BAT/ Series FLMG
Cable Color Codes
Orange and Blue: Serial Output (Do Not Use)
Green (+) and White (-): Pulse Output, 30 Vdc max, 10 mA max
Red (+) and Black (-): External Power, 8-32 VDC at 30 mA max
Drain: Connect to earth ground (see WARNING)
WARNING: Using an unregulated power
supply >18 Vdc may damage the meter
due to AC line input voltage uctuation.
Series RTI/ Series FLMG
WARNING: Using an unregulated power
supply >18 Vdc may damage the meter
due to AC line input voltage uctuation.
Page 7
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TROUBLESHOOTING
Problem
Blank Display
Flow rate steadily reads
zero when there is ow
Flow rate intermittently
drops when there is ow
Probable Cause Try...
No power plus dead backup battery
Flow is below cutoff (very low)
Pipe is not full
Meter is installed backwards
(display reads [ - ] )
Power connections reversed
Fluid conductivity <20microSiemens/cm
Pipe is not full
Replace battery pack, check power
connections
Reading will resume when ow increases
Reposition meter for full pipe (see page 4)
Note ow direction arrow, reverse meter
Change power connections
Select another ow meter
Reposition meter for full pipe (see page 5)
Jumpy reading
Meter reads, but no
pulse output
Output pulses missing
Missing or incorrect ground wire
Pulsing ow
Rapidly changing conductivity
(in chemical injection applications)
External device needs pull-up resistor
Reversed leads (polarity sensitive)
Meter not reading
Check for proper ground
Use external power source
(allows more ow averaging)
Install chemical injection line downstream
of meter (or far enough upstream to allow
complete mixing of uids before meter)
Add pull-up resistor
Change output connections
Check display
Page 8
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