Omega FMG600 Series User manual

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Design, Assembly and Service Manual Page 1 of 44
Induction flow meter FMG600 series
Content
1. APPLICATION ............................................................................................................................................. 2
2. MEASUREMENT PRINCIPLE..................................................................................................................... 2
3. TECHNICAL DESCRIPTION....................................................................................................................... 3
3.1. GENERAL .................................................................................................................................................................. 3
3.2. METER DESIGN ........................................................................................................................................................... 3
3.2.1. Remote version............................................................................................................................................... 3
3.2.2. Compact version .............................................................................................................................................. 4
4. TECHNICAL PARAMETERS....................................................................................................................... 5
4.1. FLOW SENSOR............................................................................................................................................................ 5
4.1.1. Selection of correct sensor size ....................................................................................................................... 5
4.1.2. Operational pressure of measured liquid.......................................................................................................... 6
4.1.3. Selection of electrode material......................................................................................................................... 6
4.1.4. Sensor tube lining............................................................................................................................................. 6
4.1.5. Compact or remote meter version?.................................................................................................................. 6
4.1.6. Dimensions of flanged sensor.......................................................................................................................... 7
4.1.7. Dimensions Tri Clover sensor .......................................................................................................................... 8
4.1.8. Flow sensor specifications ............................................................................................................................... 9
4.2. ELECTRONIC UNIT BOX ................................................................................................................................................ 9
4.2.1. Electronic unit specifications.......................................................................................................................... 10
5. METER APPLICATION RULES..............................................................................................................................................11
5.1. SENSOR PLACEMENT IN PIPING ................................................................................................................................... 11
5.2. SENSOR GROUNDING ................................................................................................................................................ 14
5.2.1. Flanged version.............................................................................................................................................. 14
5.2.2 Tri Clover......................................................................................................................................................... 15
6. FLOW METER INSTALLATION AND OPERATIONAL START............................................................... 16
6.1. SENSOR INSTALLATION .............................................................................................................................................. 16
6.2. ELECTRIC CONNECTIONS OF INDUCTION FLOW METER ................................................................................................... 17
6.2.1. Connection to power source.......................................................................................................................... 17
6.2.2. Output signal connections............................................................................................................................. 18
6.3. CONNECTION BETWEEN SENSOR AND ELECTRONIC UNIT (REMOTE VERSION)...................... 18
6.4. CONNECTION BETWEEN SENSOR AND ELECTRONIC UNIT (REMOTE METER VERSION,PROTECTION CLASS IP 68) .................. 19
6.5. OPERATIONAL START ................................................................................................................................................ 19
6.5.1 Operational start.............................................................................................................................................. 19
6.5.2. Operational data............................................................................................................................................. 20
6.5.3.1. Display formats of aggregate values.......................................................................................................... 22
6.5.3.2. Data reset................................................................................................................................................... 22
7. PROGRAMMING........................................................................................................................................ 23
7.1. PROGRAMMING OF THE BASIC MENU ITEMS .................................................................................................................. 24
7.1.1. Displayed data ............................................................................................................................................... 24
7.1.2. Samples........................................................................................................................................................ 25
7.1.3. Analog output................................................................................................................................................ 26
7.1.4. Output function.............................................................................................................................................. 29
7.1.5. Electrode cleaning.......................................................................................................................................... 34
7.1.6. Serial line ...................................................................................................................................................... 35
7.1.7. Production data............................................................................................................................................. 37
7.1.8. Dose setting.................................................................................................................................................. 39
7.1.9. Zero setting................................................................................................................................................... 40
7.1.10. 100 percent ................................................................................................................................................. 40
7.1.11. Exit.............................................................................................................................................................. 40
7.2. THE PARAMETER SETTING MENU ................................................................................................................................ 42
7.3. THE PRODUCTION DATA MENU ................................................................................................................................... 43
8. STANDARD TESTS................................................................................................................................... 44
9. CALIBRATION AND VERIFICATION TESTS........................................................................................... 44

Design, Assembly and Service Manual Page 2 of 44
Induction flow meter FMG600 series
1. APPLICATION
Flow meters FMG600 SERIES are primarily used for measuring instantaneous flow rate and volume of water
or similar liquids passed through the meter. Flow meters shall only be used in standard non-explosive
environments.
Any installation of flow meter must be in conformity with technical conditions mentioned in this manual.
Measurements can be done in both flow directions, with high measurement accuracy over a wide range of
flow rates 0.33 to 32.8 ft/s (0.1 to 10 m/s). The minimum required conductivity of the measured medium is 20
µS/cm.
The measurement evaluation electronic unit includes a two-line alphanumeric display to show the measured
values where various operational parameters of the meter can be selected by means of an associated
keyboard. Available are two passive binary outputs (frequency, pulse and limit values), one active current
output and an output to connect a digital communication line. All meter functions and output parameters can
be reset during the meter operation.
Should the need arise; the user may combine any sensor of the FMG600 series with any electronic units
without re-calibration of the meter on a test stand. The only thing that needs be done is to enter into the
electronic unit memory the calibration constants and excitation frequency of the selected sensor; these data
are given on the rating plate of the sensor. The value of threshold flow rate shall be set between 0.5 and 1%
of the specified maximum flow rate.
2. MEASUREMENT PRINCIPLE
The function of an induction flow meter is based on Faraday’s induction law. The meter sensor consists
of a non-magnetic and non-conductive tube with two embedded measuring electrodes to pick up the induced
voltage. To create an alternating magnetic field, two coils are fitted onto the tube in parallel with the plane
defined by the active parts of the measuring electrodes. Now if a conductive liquid flows across magnetic
field B, voltage Uwill appear on the measuring electrodes proportional to the flow velocity v and the
conductor length l.
U = B x l x v
Uinduced voltage
B magnetic flux density
l distance between the measuring electrodes
v liquid flow velocity

Design, Assembly and Service Manual Page 3 of 44
Induction flow meter FMG600 series
As the magnetic flux density and distance between the electrodes are constant, the induced voltage is
proportional to the liquid flow velocity in the tube. The value of the volume flow rate can then be readily
determined as a product of the flow velocity and square section of the tube, Q = v x S.
3. TECHNICAL DESCRIPTION
3.1. General
The induction flow meter consists of a sensor through which the measured liquid flows and an electronic unit
where the low-level signal from the sensor is modified to a standardized form suitable for further processing
in various industrial electronic devices. The output signal is proportional to the volume flow rate of the
measured liquid. The only factor limiting the application of induction flow meters is the requirement that the
measured liquid shall be conductive and non-magnetic. The induction flow meter can be designed either as
a compact device or with the sensor separated from the associated electronic unit. In the former case, the
electronic unit is fitted directly onto the meter sensor, in the latter case it is connected to the sensor by
special cable.
The sensor design shall take into consideration the type of the measured liquid and its operational
parameters. To facilitate fitting into the liquid piping, the sensor can be provided with end flanges, threaded,
or it maybe of a flangeless design. The supply voltage, types of output signal and communication interface
can be selected according to the customer requirements.
The basic configuration of induction flow meter includes two insulated passive binary outputs (each with
an opt coupler including a transistor output), insulated RS485 communications, dry relay, 4-20 mA output
and the USB communication interface. This USB interface is not insulated as it is used for factory calibration
purposes only. Optional accessories to this basic configuration are INPUT1 and OUTPUT3 for batching (all
with galvanic separation) –B, empty pipe detection -EPT.
Upon fastening the connecting wires into the respective terminals, make sure to tighten the bolts holding the
lid of the electronic unit and seal the cable glands. Fit blinds into the unused gland openings.
3.2. Meter design
3.2.1. Remote version
Flanged sensor connected by a cable with the associated separate electronic unit.

Design, Assembly and Service Manual Page 4 of 44
Induction flow meter FMG600 series
Dimensions of the box to accommodate separate electronic unit and the mounting bracket
3.2.2. Compact version
Compact design solution for a flanged sensor with associated electronic unit
Dimensions of the box to accommodate a compact version of the flow meter
9,6" (245)
7,9" (200)6" (152)
9,45" (243)
6,8" (173)
2" (50)
1,4" (35)
5,3" (135)
0,8" (20)
2,4" (60)
O0,25"(6,4)
3,5" (90)
7,9" (200)6" (152)
COMFORT
3,5" (90)
5,3" (135)

Design, Assembly and Service Manual Page 5 of 44
Induction flow meter FMG600 series
4. TECHNICAL PARAMETERS
4.1. Flow sensor
4.1.1. Selection of correct sensor size
The following table shows minimum and maximum flow rates for various sensor sizes and flow velocities
ranging from 0.33 to 32.81 ft/s (0.1 to 10 m/s). The operational flow-velocity range is best to choose 1.64 to
16.40 ft/s (0.5 to 5 m/s), see the diagram below. For lower flow velocities, the measurement accuracy is
worse while at higher flow velocities the turbulences at contact edges may cause undesirable interference.
Minimum and maximum flow rates for various sensor sizes
DIN ANSI GPM l / s GPH m
3
/
hou
r
DN inches Qmin Qmax Qmin Qmax Qmin Qmax Qmin Qmax
15 ½0.29 29 0.018 1.8 17.2 1712 0.065 6.5
20 ¾ 0.528 52.8 0.0333 3.33 31.7 3167 0.12 12
25 1 0.79 79 0.05 5 47.6 4755 0.18 18
32 1 ¼- 1.32 132 0.0833 8.33 79.3 7925 0.30 30
40 1½1.98 198 0.125 12.5 118.9 11888 0.45 45
50 2 3.17 317 0.2 20 190 19020 0.72 72
65 2 ½ 5.28 528 0.3333 33.33 317 31700 1.2 120
80 3 7.93 793 0.5 50 475.5 47552 1.8 180
100 4
12.33 1233 0.7777 77.77 739.6 73962 2.8 280
125 5
18.93 1893 1.1944 119.44 1136 113594 4.3 430
150 6 28.62 2862 1.8055 180.55 1717 171711
6.5 650
200 8
50.63 5063 3.194 319.4 3038 303764 11.5 1150
250 10 79.25 7925 5 500 4755 475523 18 1800
300 12 111 11100 7 700 6657 665732 25.2 2520
Operational flow rates and flow velocities for various sensor sizes

Design, Assembly and Service Manual Page 6 of 44
Induction flow meter FMG600 series
4.1.2. Operational pressure of measured liquid
The standard versions of flow sensors have the following pressure rating:
Sensor size Pressure ratin
g
DN 15
–
DN 300 1/2” and 12” PN 10 (1.0 MPa) 145 PSI
4.1.3. Selection of electrode material
Standard electrodes made of Hastelloy C4. However, in special applications it may be necessary to select a
different material. On request, Omega can supply electrodes made of tantalum -TGE.
4.1.4. Sensor tube lining
Teflon
Teflon (PTFE) lining is a universal solution for highly corrosive liquids and temperatures ranging from -4 °F
to 302 °F (–20 to +150°C). Typical applications are in the chemical and food processing industries.
4.1.5. Compact or remote meter version?
Temperature of the liquid is lower than 122 °F (50°C): It is possible to use both, compact or remote
version. Using of the version is only question of the layout or customer wish.
Temperature of the liquid is higher than 122 °F (50°C): Must be used remote version!
To prevent electromagnetic interference via the connecting cable, the sensor and separate electronic unit
of the meter in the remote version should be located as close as possible to each other. The maximum cable
length depends on the conductivity of the measured liquid (see the following diagram). Standard cable length
is 19,7" (6 m). .

Design, Assembly and Service Manual Page 7 of 44
Induction flow meter FMG600 series
4.1.6. Dimensions of flanged sensor
Sensor dimensions for various rated diameters Line size (DN)
Flanges according standard ANSI B 16.5 150 lb/sq.in.
Nom. size DN
D Inches (mm) d Inches (mm) A* Inches (mm) L Inches (mm) l Inches (mm) Weight lb (kg)
½" (15) 3.5 (89) 2.4 (62) 6.5 (164) 7.9 (200) 2.6 (66) 7 (3)
¾" (20) 3.9 (99) 2.4 (62) 6.7 (170) 7.9 (200) 2.6 (66) 7 (3)
1" (25) 4.3 (108) 2.8 (72) 7.1 (180) 7.9 (200) 3.8 (96) 7 (3)
1 ¼" (32) 4.6 (117) 3.2 (82) 7.8 (199) 7.9 (200) 3.8 (96) 9 (4)
1 ½" (40) 5.0 (127) 3.6 (92) 8.2 (209) 7.9 (200) 3.8 (96) 9 (4)
2" (50) 6.0 (152) 4.2 (107) 8.8 (223) 7.9 (200) 3.8 (96) 13 (6)
PN10 2 ½" (65) 7.0 (178) 5.0 (127) 9.6 (244) 7.9 (200) 3.8 (96) 20 (9)
3" (80) 7.5 (191) 5.6 (142) 10.2 (260) 7.9 (200) 3.8 (96) 31 (14)
4" (100) 9.0 (229) 6.4 (162) 11.0 (280) 9.8 (250) 3.8 (96) 35 (16)
5" (125) 10.0 (254) 7.6 (192) 12.2 (310) 9.8 (250) 5.0 (126) 42 (17)
6" (150) 11.0 (279) 8.6 (218) 13.4 (340) 11.8 (300) 5.0 (126) 55 (26)
8" (200) 13.5 (343) 10.8 (274) 15.7 (398) 13.8 (350) 8.3 (211) 91 (41)
10" (250) 16.0 (406) 14.6 (370) 18.9 (480) 17.7 (450) 8.3 (211) 120 (54)
12" (300) 19.0 (483) 16.5 (420) 21.1 (535) 19.7 (500) 12.6 (320) 170 (77)
* Dimension A (sensor height) is net of the electronic unit box (or terminal box in the remote meter
version).
Weights of the sensors are only approximate.

Design, Assembly and Service Manual Page 8 of 44
Induction flow meter FMG600 series
4.1.7. Dimensions Tri Clover sensor
Tri-Clover
Size DN/OD ID GPM l / s GPH m
3
/
hou
r
Inch (mm) mm Qmin Qmax Qmin Qmax Qmin Qmax Qmin Qmax
½ (12.70) 9.40 0.1094 11.0001 0.0069 0.6940 6.564 660.006 0.0248 2.4984
¾ (19.05) 15.75 0.3091 30.8812 0.0195 1.9483 18.546 1852.872 0.0702 7.0139
1 (25.40) 22.1 0.6087 60.8018 0.0384 3.8360 36.522 3648.108 0.1382 13.8096
1 ½ (38.10) 34.8 1.5074 150.7603 0.0951 9.5115 90.444 9045.618 0.3424 34.2414
2 (50.80) 47.5 2.8087 280.8756 0.1772 17.7205 168.522 16852.536 0.6379 63.7938
2 ½ (63.50) 60.2 4.5110 451.1493 0.2846 28.4631 270.660 27068.958 1.0246 102.4672
OD Outer Diameter
ID Inner Diameter
Sensor dimensions for various rated diameters Line size (DN)
Flanges according Tri Clover
OD Outer Diameter
ID Inner Diameter
Size DN/OD
Inches (mm)
ID
inches (mm)
D
Inches (mm)
A*
Inches (mm)
L
Inches (mm)
Weight
lb (kg)
½" (12.70) 0,37 (9.40) 2.9 (74) 5.6 (143) 5.4 (137) 3.5 (1.6)
¾" (19.05) 0,62 (15.75) 2.9 (74) 5.6 (143) 5.4 (137) 3.5 (1.6)
PN10 1" (25.40) 0,87 (22.1) 2.9 (74) 5.6 (143) 5.4 (137) 3.7 (1.7)
1 ½" (38.10) 1,37 (34.8) 3.7 (94) 6.4 (163) 5.4 (137) 4.8 (4.8)
2" (50.80) 1,87 (47.5) 4.1 (104) 6.8 (173) 5.4 (137) ()
2 ½" (63.50) 2,37 (60.2) 5.1 (129) 7.8 (199) 7.6 (192) ()
* Dimension A (sensor height) is net of the electronic unit box (or terminal box in the distributed meter
version).
Weights of the sensors are only approximate.
A
L
D
DN/OD
ID

Design, Assembly and Service Manual Page 9 of 44
Induction flow meter FMG600 series
4.1.8. Flow sensor specifications
Sensor size Flanged sensors, ½ “ to 12 “ (DN 15 to DN 300)
Tri Clover, ½ " to 2 ½ "
Operational pressure PN 10
(
1.0 MPa
)
for DN 15 to 300, Tri Clover
Mechanical connection Flanges acc. to 150#
A
NSI B
Tri Clover
grounding On flanges
Grounding rings
g
roundin
g
electrode
Limit flow velocities of measured liquid From 0.33 to 32.81 ft/s
(
0.1 m/s to 10 m/s
)
Maximum temperature of measured liquid up to 302 ºF
(
150 ºC
)
Minimum conductivit
y
of measured liquid 20 S/cm
Empt
y
pipe alarm Optional from 2 “
(
DN 50
)
-EPT
Linin
g
Teflon
(
PTFE
)
Measuring electrodes Hastelloy C4 standard
Platinum/gold -GGE
Tantalum
–
TGE
Protection class IP 67
Storage temperature 14 to 158 ºF (-10 ºC to +70 ºC) at max. relative air
humidit
y
70%
4.2. Electronic unit box
The signal-processing electronic unit is accommodated in a cast aluminum box coated on the surface with
paint of hue RAL 1017. The box is held by four M5 bolts with hexagonal socket heads. Upon loosening the
bolts slightly the box can be rotated around horizontal axis through ±180°. At the rear of the box is a terminal
board under a lid held in position by six bolts with hexagonal socket heads. At the rear bottom part of the box
there are cable glands and a special valve preventing condensation of the air humidity inside the box. The
unused gland openings shall be blinded. The front panel of the box is fitted with a two-line background-
illuminated display unit and a four-button membrane keyboard.
Prior to putting the meter in service, check the correct sealing of all active glands, blinding of the unused
ones and tightening of the bolts holding the terminal board lid.

Design, Assembly and Service Manual Page 10 of 44
Induction flow meter FMG600 series
4.2.1. Electronic unit specifications
Power source 230 V~ (+10 % / -15 %) / 50 ÷ 60 Hz optional
115 V~ (+10 % / -15 %) / 50 ÷ 60 Hz optional
24 V~ (+10 % / -15 %) / 50 ÷ 60 Hz optional
24 V =
(
±10 %
)
Standard
Power consumption 15 VA
Line fuse T250 mA, T2,0 A (with power supply 24 V)
Electric shock protection according to
standard CSN 332000-4-41
Automated disconnection from power source in TN-S network
Box material Aluminum casting
Weight 6.6 lb (3.0 kg)
Ambient temperature 23 to 131 ºF (-5 °C to 55 °C) (protected from direct sun light)
Storage temperature 14 to 158 ºF (-10 °C to 70 °C) at relative air humidity not
exceeding 70 %
Flow velocity range 0.33 to 32.8 ft/s ( 0.1 to 10 m/s)
Maximum flow error 0.2 % for 10 to 100 % Qmax
0.5 % for 5 to 100 % Qmax
Zero adjustment Standard
Output 1 - passive output, insulated
Output 2 - passive output, insulated
Relay output
Active current output, insulated
Binary multi-function optocoupler 30 V/50 mA
Binary multi-function optocoupler 30 V/50 mA
Binary multi-function relay 30V DC /0,3 A,
Analog 0 (4) to 20 mA, max. Load 1000 Ohm
Serial communication ports USB (not insulated) for factory calibration only
RS 485 (insulated)
Protection class IP 67

Design, Assembly and Service Manual Page 11 of 44
Induction flow meter FMG600 series
5. METER APPLICATION RULES
5.1. Sensor placement in piping
No chemical injection or batching unit (such as chlorine compound injector) should be located at the input
side of the sensor. The insufficient homogeneity of the flowing liquid may affect the flow-rate values indicated
by the meter.
The meter performance will be the best if the liquid flow in the piping is well stabilized; therefore it is
necessary to observe specific rules for the sensor placement in piping. In the contact planes between the
sensor and the adjoining piping sections should be no edges as these would cause flow turbulence. Make
sure that straight piping sections are provided before and after the sensor; their required length is
proportional to the inner diameter of the piping concerned.
If more than one flow-disturbing element such as pipe bend or fitting is located near the sensor, the required
length of straight piping section on the sensor side concerned should be multiplied by the quantity
of such elements.
In the cases of bi-directional flow-rate measurement, the same conditions concerning flow stability shall be
met at the input and output sides of the sensor.
Required straight piping sections Pipe narrowing
.
In the case where the pipeline nominal size is bigger
than nominal size of flow meter, it is necessary to use
conical reduction with the maximum slope 15°. In the
case of bi-directional flow, conical reduction must be
installed on both sides, both with minimum straight
piping 5 DN. In the case of horizontal installation,
eccentric reduction must be use to prevent bubbling.
Pipe narrowing sections with angles not exceeding 8° can be taken for straight sections (see picture above)

Design, Assembly and Service Manual Page 12 of 44
Induction flow meter FMG600 series
In the cases where the liquid is pumped, the flow sensor shall always be placed at the output side of the
pump to prevent underpressure in the piping which might damage the sensor. The required length of the
straight piping section between the pump and sensor is then at least 25 DN.
Pump in the piping Closing valve in the piping
For the same reason, the sensor shall be always placed before the closing valve in the piping.
The sensor can be fitted in the piping in either horizontal or vertical position. However, make sure that the
electrode axis is always horizontal and, if the sensor is mounted in a horizontal position, the flange section
for attachment of the electronic unit box faces upwards.

Design, Assembly and Service Manual Page 13 of 44
Induction flow meter FMG600 series
Electrode axis Sensor mounted in a vertical position
In the cases where the sensor is mounted in a vertical position, the flow direction shall always be upwards.
Risk of liquid aeration Permanent flooding of sensor
To ensure correct meter function at all times, the measured liquid shall completely fill up the sensor and no
air bubbles shall be permitted to accumulate or develop in the sensor tube. Therefore the sensor shall never
be placed in the upper pocket of the piping or in a vertical piping section where the flow direction is
downwards.
In piping systems where complete flooding of the piping cannot always be guaranteed, consider placing the
sensor in a bottom pocket where full flooding is sure.
If the sensor is located near a free discharge point, such point shall be by at least 2 DN higher than the top
part of the sensor.
Sensor placement near free discharge point
Elektrode
axis

Design, Assembly and Service Manual Page 14 of 44
Induction flow meter FMG600 series
Make sure that the adjoining piping is clamped/supported as close to the sensor as possible, to prevent
vibrations and damage to the sensor.
Undesirable sensor vibrations Sensor bypass
In applications where continuous liquid flow is essential, a bypass shall be provided to allow for sensor
servicing. A sensor bypass may be also reasonable solution in the cases where, to dismantle the flow sensor
from the piping, liquid from a very long piping section would have to be discharged.
5.2. Sensor earthing
The correct meter function requires that the sensor and adjoining piping sections be connected by low-
impedance earthing conductors to the earth potential and the protection conductor of the power source. The
overall arrangement shall be such that the potentials of the measured liquid at the sensor input and output
sides are close to the ground.
5.2.1. Flanged version
With a flanged sensor installed in conductive piping, the flanges shall be electrically connected and the
piping put to the earth.
Flange earthing connection Earthing rings
Should the adjoining piping sections be non-conductive, grounding rings or similar arrangement shall be
used to ensure that the electric potential of the measured liquid is put to the earth.
With a remote version, it is recommended to electrically connect flow sensor with electronics housing box
with conductors AWG10 or AWG12 to assure stabilization of the electric potentials.

Design, Assembly and Service Manual Page 15 of 44
Induction flow meter FMG600 series
5.2.2 Tri Clover
Tri Clover Flange earthing connection Additional earthing
With a remote version, it is recommended to electrically connect flow sensor with electronics housing box
with conductors AWG10 or AWG12 to assure stabilization of the electric potentials.

Design, Assembly and Service Manual Page 16 of 44
Induction flow meter FMG600 series
6. FLOW METER INSTALLATION AND OPERATIONAL START
The meter installation work shall be performed in strict observance of the procedures and rules described
in this manual.
To prevent undesirable interference, the power cables shall be laid at least 10“ (25 cm) away from all signal
cables. The signal cables include the cable connecting the sensor and the associated electronic unit (in the
case of a remote meter version), signal output cables and the cable of the RS 485 communication line. All
cables shall be laid outside the thermal insulation layer on the piping. Only shielded conductors shall be used
to connect the output signals and the RS 485 line where the shielding shall be connected to the ground
potential only on the side of the control system.
In applications where high levels of electromagnetic field interference at the measuring location can be
expected (e.g. in the vicinity of power frequency converters), the remote meter version should be avoided. In
these cases it is also recommended to include a filter in the power supply line to the electronic unit.
Filter specification: The filter suppresses spread of the undesirable high frequency disturbances from power
supply cable into the flow meter. It is possible to find standard product of any filter producer. Use filter with
desired protection, or install filter inside of the box with protection. Filter should be as near to the converter,
as possible. Keep all security standards.
Operating voltage: 115 V/60 Hz (250V/50Hz)
Nominal current: 0,5A and more
Losses: 10 kHz 10 to 20 dB
10MHz 40dB
6.1. Sensor installation
The measurement point chosen for the sensor installation should ensure that the internal part of the sensor
is fully flooded with the measured liquid at all times. Any, if partial, emptying or aeration of sensor
in operation shall be avoided. If the sensor is mounted in vertical position, the only permitted liquid flow
direction is upwards. No thermal insulation shall be used on the sensor body.
Sensor must never be under thermal insulation. If flow meter is installed in the pipeline with thermal
insulation, this insulation must be interrupted and sensor must be out of the insulation.
The internal diameters of the piping, connecting flanges and the sensor tube shall be identical. The flange
faces shall be perpendicular to the piping. The input and output piping sections including seals shall be
perfectly aligned, with no protruding edges. In the case of a non-conductive piping, use grounding rings
on both sides of the sensor.
The arrow on the sensor body shall indicate the liquid flow direction (positive flow direction).
Upon loosening the four bolts holding the electronic unit box in position on the sensor, the box can be rotated
through ±180°. The same system for the box rotation can be used if the box is mounted on a bracket
attached to a vertical support plate or wall.
Do not expose the electronics box to straight sunshine, for outdoor installation use cove or shield - it is
not in the normal scope of supply.

Design, Assembly and Service Manual Page 17 of 44
Induction flow meter FMG600 series
6.2. Electric connections of induction flow meter
The terminals for connecting cables can be accessed upon removal of a cover at the rear part of the box
housing the electronic unit. The cover is held by six socket-head bolts. A schematic diagram of the
connections is shown on the rear side of the cover. Note: USB is for factory calibration only.
Examples of labels showing power supply (line voltage or 24VDC source) and meter signal interconnection
6.2.1. Connection to power source
Terminal 24V 115V 230V/AC/50 ÷ 60 Hz Terminal 24V/DC
PE PE grounding conductor PE PE grounding conductor
N N neutral conductor MM middle conductor
U L phase conductor CL+ +24 V
To connect the power source, use a standard cable of three conductors of square section, not exceeding
3 x AWG 16 (1,5 mm2). For ambient temperatures over 122 ºF (50 ºC), use a cable with rated operating
temperature of at least 194 ºF (90 ºC). Only cables with outer diameters from 0.16" to 0.31“(4 to 8 mm) can
be used with grommet. Using of other diameters of cables cause breaking of protection IP67.
The earthing conductor shall be longer than the phase and neutral conductors. This is a safety requirement
as in the case of loosening the cable clamping in the gland, the earthing conductor shall be the last to be
disconnected from the terminal.
The power supply line shall be protected by an overcurrent circuit breaker. A seal should be applied on the
breaker to prevent unauthorised handling. The electronic unit has no independent power switch.. The
recommended rating of the overcurrent circuit breaker is 4 to 6 A.

Design, Assembly and Service Manual Page 18 of 44
Induction flow meter FMG600 series
6.2.2. Output signal connections
Terminal Polarit
y
Function Comments
1 Switching contac
t
Change-over contac
t
Optocoupler contacts.
2 Central contact Output rela
y
0,3 A, 30 VDC
3 Break contac
t
4 - pole Current output
A
ctive output, loading Rz max. 1000 .
No external power source needed.
5 + pole
6 Conductor B (-) RS 485 To be directly connected
to the communication line.
7 Conductor A (+)
8
A
node (+) Dosing (optional)
Binary input 1 Passive input. 5 VDC, 10 mA.
9 Cathode (-)
10 Optocoupler. collector (+) Dosing (optional)
Binary output 3
Passive output, requires external power
source and loading resistor..
11 Optocoupler emitter (-)
12 Optocoupler collector (+) Binary output 2 Passive output, requires external power
source and loading resistor.
13 Optocoupler emitter (-)
14 Optocoupler collector (+) Binary output 1 Passive output, requires external power
source and loading resistor.
15 Optocoupler collector (-)
The output terminals can be connected to other electronic equipment using standard shielded signal cables.
For connecting between output terminal and other device can be used shielded data cable with diameter
0.12 to 0.26 “ (3 to 6,5 mm) and intersection AWG 20 to AWG 16 (0,5 to 1,5 mm2). For connection of output
signals and communication is necessary to use shielded cables. Shielding must be connected only on one
side of the control system.
After finishing connection, screw up all screws of covers and ensure that it is fixed well. Plug up all unused
grommets and check, that used grommets are tight.
6.3. Connection between sensor and electronic unit (remote version)
In a compact version of the meter, this connection is internal. With a remote meter version, the electronic unit
shall be connected to the associated sensor be means of a special cable supplied attached on the electronic
unit side. On the sensor side, connect the cable wires paying attention to the wire insulation colors and the
terminal identification labels.
Special cable UNITRONIC Cy PiDy 3x2x0.25 length up to 50m, temperature up to 70°C:
Brown BN
A
Blue BU B
White WH C
Green GN D
Yellow YE E
Yellow and green GNYE Shielding
Pink PK W2
Gray GY W1