EX80-Series
ISO
ELECTROMAGNETIC FLOW SENSOR
INSTRUCTIONS
EX80- SERIES ELECTROMAGNETIC FLOW SENSOR INSTRUCTIONS
9 001:2008
CERTIFIED COMPANY
EX81
EX82
EX83
TABLE OF CONTENTS
General Information
Features, Specications .......................................................................................................................................Page 1
Installation
Distorted Flows, Fitting Installation, Chemical Injection or Fertigation, Meter Installation,
Positioning the Meter ............................................................................................................................................Page 2
Straight Pipe Recommendations .........................................................................................................................
Full Pipe Recommendations .................................................................................................................................Page 4
Electrical Connections
General Electrical Guidelines, Power, Forward Flow Output, Reverse Flow Output,
Grounding Guidelines, Grounding Diagram.........................................................................................................Page 5
Connections Diagrams
Counter or PLC, A055 4-20 mA Output, FT520 Controller .................................................................................Page 6
FT420 Display and Proportional Feed, FT420 & 4-20 mA Output,
Dual FT420 Displays (example of bidirectional connection)..............................................................................Page 7
DL76, FT420/DL76 ...............................................................................................................................................Page 8
Operation & Maintenance
Zero Adjustment, Minimum Flow, Flow Rate Table, Presence of Flow Indication,
Filtering, Electrode Coating, Calibration (“K-Factor”), K-Factor Chart ...............................................................Page 9
Page 3
Caution & Troubleshooting
Problems, Probable Causes .................................................................................................................................Back
TABLES AND DIAGRAMS
Features .................................................................................................................................................................Page 1
Specications ........................................................................................................................................................Page 1
Distorted Flows, Positioning the Meter ................................................................................................................Page 2
Straight Pipe Recommendations .........................................................................................................................
Full Pipe Recommendations .................................................................................................................................Page 4
Grounding Diagram ...............................................................................................................................................Page 5
Counter or PLC, A055 4-20 mA Output, FT520 Controller .................................................................................Page 6
FT420 Display and Proportional Feed, FT420 & 4-20 mA Output,
Dual FT420 Displays (example of bidirectional connections) ............................................................................Page 7
Page 3
DL76, FT420/DL76 ...............................................................................................................................................Page 8
Flow Rate Table, K-Factor Chart ...........................................................................................................................Page 9
Troubleshooting .....................................................................................................................................................Back
GENERAL INFORMATION
EX80-Series insertion electromagnetic owmeters are designed
for use with conductive liquids in 1 to 12” pipe. A choice of
materials (stainless steel, brass, and PVC) allows the meter
to adapt to a range of temperature, pressure, and corrosive
environments.
The EX80 is highly suitable for difcult applications with changing
viscosities and pulsating ows, such as air-driven diaphragm
pumps. With no moving parts, these meters can be used in
“dirty” applications where debris would foul a mechanical
meter. Like all magmeters, when used in chemical injection
applications, these meters should be installed upstream of the
chemical line (or far enough downstream to allow complete
mixing of uids before the meter).
Designed for modularity and versatility, the EX80-Series has
a current-sinking pulse output that can be combined with the
appropriate transmitter or indicator for the application. For
FEATURES
Cover, or transmitter or indicator module
Powder coated aluminum housing
Cable strain relief
analog output and display of rate and total, an FT420 can be
used. Blind analog output is provided by the AO55. The PD10
can be used to divide the pulse for pacing chemical metering
pumps and the DL76 (data logger) is also compatible. Modules
can be wall- or meter- mounted. If the EX80 meter is used with
a programmable controller, the output signal can be fed direct,
with no other conditioning required.
EX80-Series fixed depth insertion meters require special
ttings. Factory installation in the tting ensures correct depth
placement in the pipe. The EX80-Series meter can be ordered
in a full power model when a source of electricity is available,
or in a low power model that can run on an external battery
with solar panel.
Reverse ow output and immersibility are optional.
O-ring, EPDM (Viton optional)
Sensor body (Stainless, Brass, PVC)
PVDF electrode cap
SPECIFICATIONS*
Pipe Size
Materials Mechanical
Electrodes
Housing
Electrode Cap
O-Ring
Power Full Power
Low Power
Flow Rate
Temperature Ambient Temp
Fluid Temp : Brass/SS
Fluid Temp: PVC
Pressure Brass/SS
PVC
Minimum Conductivity
Calibration Accuracy
Output
Empty Pipe Detection
*Specications subject to change • Please consult our website for current data (www.seametrics.com).
1” to 12”
316 SS/Brass/PVC
Hastelloy
Cast powder-coated aluminum
PVDF (Kynar)
EPDM standard (Viton optional)
12 - 25 Vdc, 250 mA
12 - 25 Vdc, 40 mA average with 250 mA peaks
0.28 - 20 ft/sec (0.08 - 6.09 m/sec)
0˚ to 160˚ F (-17˚ to 72˚ C)
32˚ to 200˚ F (0˚ to 93˚ C)
32˚ to 130˚ F (0˚ to 55˚ C) @ 0 psi
200 psi (13.8 bar)
150 psi (10 bar) @ 75˚ F
20 microSiemens/cm
+/- 1% of full scale
Square wave pulse, opto isolated, 550 Hz @ 20 ft/sec
Software, defaults to zero ow
Hastelloy electrodes
Page 1
INSTALLATION
DISTORTED FLOWS
Faster Flow
Distorted
Flow Prole
Fitting Installation. EX80-Series meters require special ttings that ensure that the ow sensor is installed to the correct
depth. The tting must be installed in the pipeline before the
meter can be installed. For best results, install with at least
ten diameters of straight pipe upstream of the meter and
ve diameters downstream (or more under specic adverse
circumstances). See diagrams, next page.
Causes Meter
To Read High
10X
5X
Caution: In chemical injection or fertiga-
tion applications, install chemical injection
point downstream of magmeter, or far
enough upstream to allow complete mixing of uids before the meter.
Meter Installation. After the meter tting is installed in the
pipeline, the meter can be installed in the tting. After noting
the direction of the ow arrow, press the meter into the tting
as far as it will go. Retain the meter in place by inserting the
U-clip. The pin can be installed from either side. It may be
necessary to rotate the probe back and forth slightly to start
the pin into the slots on the probe. Slide the pin in as far as
it will go.
Caution: These ow sensors are not recom-
mended for installation downstream of a
boiler feedwater pump where installation
fault may expose the ow sensor to boiler
pressure and temperature. Maximum recommended
temperature is 130°F (Plastic), 200°F (Metal).
If there is not enough straight run to smooth out the turbulence caused by valves, ttings, and changes in direction,
some decrease in accuracy may result. This does not mean
that the ow meter’s reading is meaningless, however. In
some applications (control systems, valve operation, chemical addition), a repeatable reading may be more important
than a highly accurate one.
Although EX80-Series PVC meter tees are supplied with some
straight pipe, additional straight pipe should be added to
meet straight pipe recommendations. It is not advisable to
connect a ow-disturbing device (e.g. valve or elbow) directly
to the end of these ttings.
A PVC tting is usually installed by solvent welding. The stainless steel and brass meter ttings have female pipe threads,
requiring the appropriate male threaded ttings. Saddleor
weld ttings (3” and above) require a hole to be cut in the
pipe. Recommended hole size is 1-3/4”.
Chemical Injection or Fertigation. When any magmeter, by
any manufacturer, is used in a chemical injection application
(including fertigation), 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 or fertilizer 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.
POSITIONING THE METER
Okay position if there is no
air in the pipe
BEST POSITIONS
Caution: Never remove the U-clip retainer
when the pipe is under pressure. Always
remove pressure from the pipe before you
attempt to remove the meter. Removal under
pressure may result in damage or serious injury.
Page 2
INSTALLATION
STRAIGHT PIPE RECOMMENDATIONS
(X = pipe diameter)
Reduced Pipe
Two Elbows In Plane
Two Elbows, Out Of Plane
10X
20X
5X
5X10X
5X
Expanded Pipe
Spiral Flow
Swirling Flow
Propeller Meter
Partially Open
Buttery Valve
20X
5X
30X
50X
Page 3
INSTALLATION
FULL PIPE RECOMMENDATIONS
Possible Problem:
Allows air pockets to form at sensor
Better Installation:
Ensures full pipe
Possible Problem:
Post-valve cavitation can create air pocket
Possible Problem:
Air can be trapped
Better Installation:
Keeps pipe full at sensor
Better Installation:
Allows air to bleed off
Page 4
ELECTRICAL CONNECTIONS
General Electrical Guidelines:
• Whenever possible avoid running control cables in
the same conduit with or bundled with AC power.
• Using shielded cable, be sure to connect shield to
ground at power supply end of the cable.
• Avoid routing ow sensor cables in close proximity to
a variable frequency drive.
• Recommended power and output wiring is shielded
twisted pair 18-22 AWG control cable.
• Recommended voltage is 12-24 Vdc. Note that
unregulated power supplies can vary from nameplate
voltage by a considerable amount, especially with AC
line voltage uctuation. Therefore 24V power supplies
must be regulated.
See the Connections diagrams on the following pages for the
appropriate terminals.
Power: A 12 - 24 Vdc power supply capable of at least 250
mA current output is needed.
Forward Flow Output: This open-collector isolated output
does not supply power. This pulse is generated in the forward
ow direction on the standard unit. (Reverse ow output is
available as an option).
Note: This output is limited to 6 mA at 30 Vdc maximum.
Reverse Flow Output: Reverse ow output is available as
an option. This open-collector isolated output does not supply
power. It functions like a polarity-sensitive switch closure.
Note: This output is limited to 6 mA at 30 Vdc maximum.
Grounding Guidelines:
For best results, use a good quality earth ground, such as
metallic water piping or a driven ground, to ensure a good
connection to earth ground and good noise suppression.
If the ow sensor is installed in metallic piping, for optimum
connection clamp wire to the piping a short distance to one
side of the ow sensor using an electrical grounding clamp.
Connect the wire to the earth ground and to one of the housing
screws.
For Non-Metallic Pipe: Connect one to the housing screws
by wire to a good earth ground, such as metalic water piping
or a rod driven into the ground.
EX meters are usually unaffected by moderate levels of electrical noise. In some applications performance may be improved
by taking the following steps:
• Use shielded twisted pair cable (Belden 8723 or
equivalent above ground or Alpha 35482 or
equivalent burial).
• Clamp a ferrite bead (Steward 28A2029-OAO or
equivalent) on meter signal/power wire within 3/4”
of the meter strain relief (tape or tie wrap in place
if necessary). See diagram below.
• IMPORTANT - Connect the cable shield ground
wire to ground, ONLY at power supply end of cable.
GROUNDING DIAGRAM
PLACE FERRITE BEAD HERE
Housing
Screw
Earth
Ground
Metallic Pipe
Grounding Clamp
Page 5
CONNECTIONS DIAGRAMS
+
_
+
_
00
9
8
7
6
5
4
3
2
1
00
9
8
7
6
5
4
3
2
1
00
9
8
7
6
5
4
3
2
1
00
9
8
7
6
5
4
3
2
1
+
_
S
+
_
+
_
+
_
+
+
_
_
+
_
+
_
+
_
COUNTER OR PLC
(Option-15 only)
A055 4-20 mA OUTPUT
Power
Forward Output
Reverse Output
(Option-15 only)
Power
Forward Output
Reverse Output
EX SERIES
*See Dual FT420 Diagram for an
example of bidirectional connections.
24 Vdc
Power
EX SERIES
Sensor
+
–
*See Dual FT420 Diagram for an
example of bidirectional connections.
12 - 24 Vdc
Max. 6 mA, 30 Vdc
Max. 6 mA 30 Vdc
FREQUENCY
4-20 mA
AO55
COUNTER OR PLC DIGI-
TAL INPUT
24 Vdc Power
4-20 mA
FT520 CONTROLLER
Pulse
Out
*See Dual FT420 Diagram for an
example of bidirectional connections.
Page 6
+12V
SEN1
SEN2
FT520
24 Vdc Power
EX SERIES
+
Power
–
+
G
Forward Output
–
Reverse Output
+
(Option-15 only)
–
+
_
S
+
_
+
_
+
+
_
_
+
_
+
_
CONNECTIONS DIAGRAMS
FT420 DISPLAY AND PROPORTIONAL FEED
Power
Forward Output
Reverse Output
(Option-15)
EX SERIES
*See Dual FT420 Diagram for an
example of bidirectional connections.
FT420 DISPLAY AND 4-20 mA OUTPUT
Power
Forward Output
Reverse Output
(Option-15 only)
*See Dual FT420 Diagram for an
example of bidirectional connections.
+
_
+
_
EX SERIES
24 Vdc Power
24 Vdc
+
Power
_
24 Vdc
Power
_
4-20 mA Device
(e.g. pump, PLC)
FT420
Sensor
Input
Power
4-20mA
_
Sensor
Input
+
S
Pulse
Scaled
Pulse
Pass-Thru
+
_
To
Proportional
Feed
Metering
Pump
FT420
Pulse
Scaled
_
+
+
+
_
+
Power
4-20mA
_
Pulse
Pass-Thru
DUAL FT420 DISPLAYS
(Example of Bidirectional Connection)
FT420
Power 4-20mA
Pulse
Pass-Thru
Pulse
Scaled
*Requires 12-24 Vdc power source.
*
Sensor
Input
Power
Reverse Output
(Option-15 only)
EX SERIES
*
Forward Output
*
Sensor
Input
Power 4-20mA
FT420
Pulse
Scaled
Pulse
Pass-Thru
Page 7
+
_
S
+
+
_
_
+
_
+
_
+
_
S
+
_
+
_
+
_
CONNECTIONS DIAGRAMS
DL76 DATA LOGGER
Power
Forward Output
Reverse Output
(Option-15 only)
EX SERIES
*See Dual FT420 Diagram for an
example of bidirectional connections.
12 - 24 Vdc
DL76
Sensor
Input
FT420/DL76
24 Vdc
Power
Power
Forward Output
Reverse Output
(Option-15 only)
*See Dual FT420 Diagram for an
example of bidirectional connections.
EX SERIES
Sensor
Input
Power 4-20mA
Page 8
FT420
Pulse
Scaled
Pulse
Pass-Thru
DL76
Sensor
Input
OPERATION & MAINTENANCE
10031295
EF81T-P200
K:158.42
Zero Adjustment. When the EX80-Series is powered up and
there is no ow, there should be no output pulses (or, if connected to the FT420, ow rate should read “0”). If there are
pulses it may be necessary to adjust the ow meter under noow conditions after it has been installed. This should only be
done if the indicated ow is low, near the lower cutoff.
Reverse Output Option
Status
LED
Zero
Adjust
Status
LED
Zero
Adj
345621
Forward
Output
Max. 6mA
30Vdc
+
-+-
Power
12-24Vdc
unauthorized repair
Warranty is void if
is attempted!
NOTICE
Pins
To perform the adjustment, after determining that there is a full
pipe with no ow, short between the two pins marked “Zero
Adjust”. A red LED light will come on for approximately 50
seconds and then go out. The zero adjustment is completed.
Minimum Flow. As with any other ow sensor, there is a rate
below which the EX80-Series sensor cannot read. Check the
ow rate table below for the minimum ow rate detectable by
the sensor for a given pipe size.
FLOW RATE (GPM)
Nominal
Pipe Size
• Min
@ 0.28 ft/sec
• Max
@ 20 ft/sec
1” 1-1/2” 2” 3” 4” 6” 8” 10” 12”
.7 1.5 2.7 6 11 25 44 69 99
49 110 196 440 783 1760 3130 4900 7050
Electrode Coating. Grease or other adhering, non-conductive
materials can stop ow detection if the electrodes become
heavily coated. To clean the electrodes, remove the sensor
from the pipe and gently scrub the electrodes (three silver
bumps) on the reading face of the ow sensor. A mild soap
(dishwashing liquid for example) can be used to aid the
cleaning process.
Calibration (“K-factor”). The K-factor represents the actual
number of pulses per gallon the meter produces during a ow
test. This number can be entered into your electronic control
to make it read properly. If the EX80-Series meter is ordered
with a tee tting, it is factory-calibrated in the tting and the
K-factor is indicated on the side of the tting (see diagram).
Find Your K-Factor Here
If the EX80-Series meter is ordered with a saddle or weldolet
tting, nd your K-factor in the chart below.
K-FACTORS SADDLES & WELDOLETS
3” 4” 6” 8” 10” 12”
PVC/Steel
Sch. 40
PVC/Steel
Sch. 80
Stainless
Steel (10S)
70.397
78.748
62.385
40.985
45.360
36.626
18.130
20.084
16.510
10.497
11.495
9.642
6.674
7.322
6.173
4.709
5.184
4.373
Presence of Flow Indication. To assist in troubleshooting,
the “Status LED” has two blinking modes in normal operation.
When there is no ow detectable by the meter (below minimum
threshold) the LED blinks every 8.0 seconds. When there is
detectable ow, the same indicator blinks every 3.0 seconds.
Filtering. The software of the EX80-Series sensor lters out
electrical noise and averages sudden variations in the ow to
smooth the output. It takes a matter of seconds for the ow
sensor to get up to full output when it is powered up or when
ow begins.
Stainless
Steel (40S)
Copper Tubing
(Type L)
Copper Tubing
(Type K)
Brass Pipe
Duct. Iron
(Class 52)
70.397
76.371
78.371
70.672
57. 376
40.985
43.552
44.638
41. 517
37.320
18.130
19.513
20.223
17.778
16.915
10.497
11.201
11.622
10.445
9.503
6.674
7.230
7.500
6.674
6.197
4.661
5.016
5.239
4.661
4.325
NOTE: K-factors are in Pulses/gallon. For Pulses/Liter, divide
by 3.785.
Page 9
CAUTION & TROUBLESHOOTING
Caution: The electronics of the EX-Series meters are not eld-repairable.
Warranty is void if unauthorized repair is attempted
TROUBLESHOOTING
Problem
No pulse output
Output pulses
incorrect
Probable Cause Try...
Pipe not full
Below minimum ow cutoff
Unit not grounded
Excessive electrical noise
No power
Flow reversed
Power reversed
Output connections reversed
Fluid conductivity <20 microSiemens/cm
Missing or incorrect ground wire
Excessive electrical noise
Check plumbing
Check the presence of Flow LED (see pg. 9)
Connect to earth ground
Check for proper electrical wiring
Check for power across power
input terminals
Note ow direction arrow,
reverse direction of meter
Reverse connections
Change output connections
Select another ow meter
Check for proper ground
Check for proper electrical wiring
Jumpy reading
Seametrics Incorporated • 19026 72nd Avenue South • Kent, Washington 98032 • USA
Fluid conductivity <20 microSiemens/cm
Empty pipe
Select another ow meter
Check for full pipe or install meter in the vertical position
Not enough straight pipe
Check for ten diameters upstream AND ve
diameters downstream
Rapidly changing conductivity (in chemical
injection or fertigation applications)
Install chemical injection line downstream of
magmeter (or far enough upstream to allow
complete mixing of uids before meter)
(P) 253.872.0284 • (F) 253.872.0285 • 1.800.975.8153 • www.seametrics.com
LT-65200203-J
8/4/10
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