Omega Products FMG-421 Installation Manual

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FMG-400’s

Electromagnetic Flowmeters

(Flange type)

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA
is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will
add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient connected
applications.

1

SAFETY PRECAUTIONS

Safety signs and labels affixed to the product and/or described in this manual give important

information for using the product safely. They help prevent damage to property and obviate

hazards for persons using the product.

Make yourself familiar with signal words and symbols used for safety signs and labels. Then read

the safety precautions that follow to prevent an accident involving personal injury, death or

damage to property.

Explanation of signal words

The signal word or words are used to designate a degree or level of hazard seriousness.

The signal words used for the product described in this manual are WARNING and CAUTION.

Indicates a potentially hazardous situation which,

WARNING

CAUTION

if not avoided, could result in death or serious
injury.

Indicates a potentially hazardous situation which,
if not avoided, may result in minor to moderate
injuries or in property damage.

Safety symbols

The following symbols are used in safety signs and labels affixed to a product and/or in the

manual for giving safety instructions.

Indicates an action that is prohibited. Simply DON’T do this action.
The

prohibited action is indicated by a picture or text inside or next to the

circle

Indicates an action that is mandatory. DO this action.
The

mandatory action is indicated by a picture or text inside or next to the

circle.

Indicates a potential hazard. The potentially hazardous situation is
indicated by a picture or text inside or next to the triangle.

2

SAFETY PRECAUTIONS (continued)

Safety Precautions for Installation and Wiring

WARNING

 Do not use the FMG400 Series in an explosive atmosphere.

Using this product in an explosive atmosphere can cause
explosion.

DON’T

CAUTION

 Turn off main power before working on

pipes.

Working on pipes while
power is applied can cause
electric shock.

DO

 Install a switch and fuse to isolate the

FMG400 Series from main power.

Power supply from main
power can cause electric

DO

 Turn off main power before conducting

wiring work.

shock or circuit
breakdown.

Wiring while power is
applied can cause electric
shock.

DO

 Do not conduct wiring work with bare

hands.

Remaining electric
charge even if power is

DON’T

 Do not work on piping and wiring with

wet hands.

turned off can still cause

electric shock.

Wet hands may result in
electric shock.

DON’T

 Use an appropriate device to carry and

install the FMG400 Series.

If this product falls to the
ground, injury, or malfunction of

DO

 Do not modify or disassemble the

FMG400 Series unnecessarily.

DON’T

 Ground the FMG400 Series independently

from power equipment.

DO

 Use crimped terminal lugs for the terminal

board and GND terminal.

DO

or damage to the product, can be
caused.

Modifying or disassembling this
product can cause electric shock,

malfunction of or damage to
this product.

Operating this product without
grounding can cause electric
shock or malfunction.

Loose connections can cause

electric shock, fire from
excessive current or system
malfunction.

The label shown left is placed
near the terminal board for power
input.
(A

black border and symbol on
yellow triangle)
Be alert to electric shock

3

SAFETY PRECAUTIONS (continued)

Safety Precautions for Maintenance and Inspection

CAUTION

 Do not touch the FMG400 Series

main body when high temperature
fluid is being measured.

The fluid raises the main
body temperature and can

DON’T

 Do not conduct wiring work with wet

hands.

cause burns when touched.

Wet hands may result in
electric shock.

DON’T

 Do not use a fuse other than the one

specified.

Using a fuse other than the
one specified can cause

DON’T

system failure, damage or
malfunction.

 Do not conduct wiring work when

power is applied.

Wiring while power is
applied can cause

DON’T

Use a rated fuse as follows depending
on the power specifications.

• Fuse rating:
1A/250V for 100 to 240 V

• Dimensions:
Diameter 5.2 mm × 20 mm

electric shock.

The label shown left is
placed near the terminal
board for power input.
(A

black border and
symbol on yellow
triangle)
Be alert to electric
shock.

ac

Disclaimer

OMEGA does not accept liability for any damage or loss, material or personal, caused as a
direct or indirect result of the operation of this product in connection with, or due to, the
occurrence of any event of force majeure (including fire or earthquake) or the misuse of this
product, whether intentional or accidental.

4

Handling Precautions

 To obtain the optimum performance from the FMG400 Series flowmeter for years of

continuous operation, observe the following precautions.

(1) Do not store or install the flowmeter in:

places where there is direct sunlight. If this is unavoidable, use an appropriate

•

sunshade.
places where excessive vibration or mechanical shock occurs.

•

places where high temperature or high humidity conditions obtain.

•

places where corrosive atmospheres obtain.

•

places submerged under water.

•

To put the flowmeter temporarily on the floor, place it carefully with something to
support it so that the flowmeter will not topple over.

(2) Execute wiring securely and correctly.

(3) Seal the cable thoroughly at the cable gland so that the cable is kept airtight.

(4) Ground the flowmeter with 100 ohm or less ground resistance. Avoid a common

ground used with other equipment where earth current may flow. An independent
ground is preferable.

(5) The converter housing covers and the cable glands are tightened securely at the time

of shipment. Do not remove these covers or glands unless it is necessary to wire new
cables or replace old ones.

Otherwise, gradual deterioration of circuit isolation or
damage to this product can be caused. Tighten the covers or cable glands securely
again if they have been removed.

(6) Make sure the fluid to be measured will not freeze in the detector pipe. This can

cause damage to the detector pipe.

(7) Select appropriate wetted materials suited for the process fluid to be measured.

Otherwise, fluid leakage due to corrosion can be caused.

(8) Observe the following precautions when you open the converter housing cover:

Do not open the cover in the open air unprotected against rain or wind. This can

•

cause electric

Do not open the cover under high ambient temperature or high humidity

•

shock or cause damage to the flowmeter electronics.

conditions or in corrosive atmospheres. This can cause deterioration of system
accuracy or cause damage to the flowmeter electronics.

(9) This product may cause interference to radio and television sets if they are used near

the installation site. Use metal conduits etc. for cables to prevent this interference.

5

Handling Precautions (continued)

(10) Radio transmitters such as transceivers or cellular phones may cause interference to

the flowmeter if they are used near the installation site. Observe the following
precautions when using them:

Do not use a transceiver whose output power is more than 5 W.

•

Move the antenna of a transceiver or a cellular phone at least 50 cm away from

•

the flowmeter and signal cables when using it. Do not use a radio transmitter or
a cellular phone near the flowmeter while it is operating online. The transmitter
or cellular phone’s output impulse noise may interfere with the flowmeter.

Do not install a radio transmitter antenna near the flowmeter and signal cables.

•

(11) For reasons of flowmeter failure, inappropriate parameters, unsuitable cable

connections or poor installation conditions, the flowmeter may not operate properly.
To prevent any of these problems causing a system failure, it is recommended that
you have preventive measures designed and installed on the flowmeter signal
receiving side.

6

Table of Contents

SAFETY PRECAUTIONS 2

Handling Precautions 5

1. Product Inspection and Storage 9

1.1 Product Inspection 9

1.2 Storage 9

2. Overview 10

3. Names of Parts 11

4. Installation 14

4.1 Location 14

4.2 Mounting 15

4.3 Piping Connections 19

5. Wiring 23

5.1 Cables 24

5.2 External Device Connections and Grounding 24

5.3 Digital I/O Connections 26

5.4 Wiring Procedure 27

6. Operation 30

6.1 Preparatory Check 30

6.2 Zero Adjustment 31

7. LCD Display and Controls 32

7.1 Outline 32

7.2 Display Format 34

7.3 Basic Operations 36

7.4 Configuration Items Selection Table 38

8. Configuration Parameter Setting 39

8.1 Configuration Items 39

8.2 Checking or Changing Parameters 40

9. Calibration 70

9.1 Calibration Items 70

9.2 Calibration Using Converter Signal Source 71

10. Digital I/O Functions 75

10.1 Digital I/O Specifications 76

10.2 Totalizer and Pulse Output 77

10.3 Multi-range Functions 79

10.4 High and Low Limit Alarms 84

7

10.5 Empty Pipe Alarm 86

10.6 Preset Point Output 87

10.7 Remote Zero Adjustment 89

10.8 Remote Selection of Fixed Value Output 90

10.9 Converter Failure Alarms 91

11. Self-Diagnostics and Alarms 92

11.1 Self-Diagnostics 92

11.2 Output Status for Errors and Alarms 95

12. Maintenance and Troubleshooting 96

12.1 Maintenance 96

12.2 Troubleshooting 98

13. Principle of Operation 101

14. Specifications 102

14.1 Flowmeter Specifications 102

14.2 Specification Code table 106

15. Outline Dimensions . 108

Appendix 1 . Electromagnetic Compatibility and Low Voltage Safety 110

Electromagnetic Compatibility 110

Low Voltage Safety 111

Appendix 2 . Default set value in each configuration item 112

8

1. Product Inspection and Storage

Upon arrival of the product package, open the package and check the items contained inside. If

you do not intend to install the product soon after opening the package, store the product and

other related items in a place such as described in 1.2 below.

1.1 Product Inspection

The FMG400 Series flange type electromagnetic flowmeter is shipped in a cardboard container

filled with shock-absorbing materials. Open the package carefully and check as follows:



Make sure the following items are included in the package.

(1) Model FMG400 Series falnge type Electromagnetic Flowmeter......

(2) Instruction Manual ...............................................................

(3) Operation Guide ....................................................................



Inspect the flowmeter for indications of damage that may have occurred during shipment.



Make sure the type and specifications of the flowmeter are in accordance with the

ordered specifications.

If you cannot find the items listed above or any problem exists, contact OMEGA.

1

1

1

1.2 Storage

To store the FMG400 Series flowmeter after opening the package, select a storing place as

follows and keep it under the conditions described below:

(1) Avoid places where there is direct sunlight, rain or wind.

(2) Store the product in a well-ventilated place. Avoid places of extremely high

humidity or extremely high or low temperature. The following environment is
recommended:

•

Humidity range: 10 to 90% RH (no condensation)

•

Storage temperature: –15 to +65° C

(3) Avoid places where vibrations or mechanical shock occurs.

(4) Do not leave the converter housing cover open . Open the cover only when you

actually start wiring cables. Leaving the cover open can cause gradual deterioration
of circuit isolation.

(5) To put the flowmeter temporarily on the floor, place it carefully with something to

support it so that the flowmeter will not topple over.

9

2. Overview

The FMG400 Series electromagnetic flowmeter measures the volumetric flow rates of

electrically conductive materials on the basis of Faraday's Law of Electromagnetic induction.

The device consists of two units: the detector, through which the fluid to be measured flows,

and the converter, which receives the electromotive force signals from the detector, then

converts the signals into the 4–20 mA

integrally mounted.

dc signal. These two units for the FMG400 Series are

Features

Every type of electromagnetic flowmeter has the following features:



Fluid flow is not obstructed and pressure loss is negligible.



The process fluid's temperature, pressure, density or flow conditions have no effect on
the accuracy of the flowmeter.



The flowmeter output is directly proportional to the process flow rate, thus it is easy to
read its output.

The FMG400 Series electromagnetic flowmeter has the following additional features:

(1) High accuracy, ±0.5% of rate is possible for 0.3–10 m/s velocity range.

(2) The flowmeter can be used to measure f

luids with solids (such as sludge or slurries)

for the reasons stated below:

The original noise-suppression circuit with signal processing capabilities

•

ensures a stable output.

(3) The flowmeter has various flow measurement output and control functions as standard

specifications and the LCD display for convenient parameter settings.

•

These functions can be selected with control keys on the panel.

(4) An easy-to-read LCD display (2-line × 16-character display)

The backlit LCD display can be read even under poor lighting conditions.

10

3. Names of Parts

N

play

The outline drawing of the FMG400 Series flange type flowmeter is shown in Figure 3.1 and

the internal views of the converter are shown in Figures 3.2 and 3.3.



Outline Drawing

Housing cover
for terminal board

Grounding terminal

ameplate

Port for power cable

Port for I/O

cable

Housing cover for

LCD dis

Detector

Converter

LCD display

Control keys

Flow derection arrow

Figure 3.1 Outline drawing of FMG400 Series flange type Flowmeter

11



Terminal Board of Converter

Power supply teminals

Internal ground terminal

Fuse

External grounding
terminal

Digital output terminals

Digital input terminal

宜しくお願い致します。

Figure 3.2 Terminal Board of Converter

Current output terminals

Signal COMMON for DI, DO1, DO2

CAUTION

The seal shown in the left figure is attached to near the

power supply wiring terminals. Be careful not to get

electric shock.

12



Control switch or keys of Converter

LCD display

Figure 3.3 Control switch or keys of Converter

Control keys

13

4. Installation

Safety Precautions for Installation

WARNING



Do not use the FMG400 Series in an

Using this product in an explosive atmosphere can
cause explosion.

explosive atmosphere

DON’T

CAUTION

 Install a switch and fuse to isolate the

FMG400 Series from main power.

Power supply from main
power can cause electric
shock or circuit breakdown.

DO

 Do not modify or disassemble the

FMG400 Series unnecessarily.

Modifying or disassembling
this product can cause

DON’T

 Do not work on piping and wiring with

wet hands.

electric shock,
or damage to this product.

Wet hands may result in

electric shock

malfunction

DON’T

.

 Use an appropriate device to carry and

install the FMG400 Series.

If his product falls to the
ground, injury, or malfunction

DO

 Ground the FMG400 Series

independently from power equipment.

of or damage to the product,
can be caused.

Operating this product without
grounding can cause electric
shock or malfunction.

DO

The label shown left is placed
near the terminal board for
power input.
(A

black border and symbol on
yellow triangle)
Be alert to electric shock.

4.1 Location

To select the installation site, follow the precautions described below:

 Avoid places where fluid runs in a pulsating form.

 Avoid places within the immediate proximity of equipment producing electrical

interference (such as motors, transformers, radio transmitters, electrolytic cells, or other
equipment causing electromagnetic or electrostatic interference).

14

 Avoid places where excessive pipe vibration occurs.

 Avoid places where there is direct sunlight. If this is unavoidable, use an appropriate shade

 Avoid places where corrosive atmospheres or high humidity conditions obtain.
 Avoid places of too great an elevation or constricted areas where clearance for installation

or maintenance work is not provided.

 Design piping so that the detector pipe is always filled with fluid, whether the fluid is

flowing or not.

 The detector has no adjustable piping mechanism. Install an adjustable short pipe where

needed.

 Chemical injections should be conducted on the downstream side of the flowmeter.

* For cautions on piping work such as the installation positions of piping and lengths of

straight pipes, see Section 4.3.

4.2 Mounting

CAUTION

 Use an appropriate device to carry

and install the FMG400 Series.

If his product falls to the
ground, injury, of

DO

malfunction of or damage
to the product, can be
caused.

 Turn off main power before

working on pipes.

Working on pipes while
power is applied can

DON’T

cause electric shock.

IMPORTANT

When high-temperature fluid is being measured, radiant heat from the detector pipe surface

and adjoining pipes may cause the ambient temperature of the converter to go above 60 °C.

If the ambient temperature goes above 60° C, try to lower the temperature by measures such

as wrapping heat-insulating materials over the detector pipe and adjoining pipes.

4.2.1 Piping Inspection

Before installing the pipes, make sure that there is no inclination of pipes or tube axial

displacement (eccentricity) as shown in Figure 4.1. Forced installation of the flowmeter in

inclined pipes may cause destruction of the detector or leakage of the fluid. Installing the

flowmeter in pipes with the presence of eccentricity may cause local friction of the lining or

earth ring and measurement errors depending on the properties of the fluid.

Before installing the pipes, flush the pipe interior to remove foreign matters in the pipes.

15

Eccentricit

y

Inclination

(a) Inclination of pipe (b) Tube axial displacement

(eccentricity)

Figure 4.1 Bad Examples with Inclination of Pipe and Tube Axial Displacement

(Eccentricity)

4.2.2 Cautions on Carrying Equipment

In order to prevent damages to the equipment, carry it packed as was at the time of delivery to

the installation location and unpack it there.

As the detector whose nominal diameter is 200 mm comes with eyebolts, lift the equipment as

shown in Figure 4.2 (a).

As the detector whose nominal diameter does not exceed 150 mm comes with no lifting means,

lift the equipment as shown in Figure 4.2 (b). The weights of the detectors with different

nominal diameters are described in Chapter 15 "Outline Dimensions."

Lifting the detector of any nominal diameter by pressing a bar into the detector pipe may

damage the lining, preventing stable measurement. Never do this under any circumstances.

* Lifting should be performed under instructions of qualified personnel of crane or slinging

work.

16

90° or less

(a) With nominal diameter of 200 mm (b) With nominal diameter of 150 mm or

less

Figure 4.2 Lifting Method

4.2.3 Mounting Procedure

To mount the FMG400 Series flange type, place it between the upstream and downstream pipe

flanges and tighten it with flange bolts and nuts. See Figure 4.3 and follow the procedure

below:

1. Insert two lower mounting bolts through the clearance holes in the upstream (or

downstream) pipe flange.

2. Install a packing next to the upstream (or downstream) flange face and the other packing

next to the downstream (or upstream) pipe flange. The two mounting bolts can now be
guided through the clearance holes in the downstream packing and flange.

3. Place the FMG400 Series flowmeter between the two flange packings, with the flowmeter

detector body above the two bolts. The flowmeter must be oriented in accordance with the
flow direction arrow.

4. Install the two upper mounting bolts through the clearance holes in the upstream and

downstream packings and flanges. Then install the remaining mounting bolts depending
on the flange pattern used.

5. Thread nuts on both ends of the 4 (or more) mounting bolts, finger tight.

17

6. While centering the flowmeter with the longitudinal axis of the pipeline, tighten the nuts

g

with a wrench diagonally across in even increments.

Note that the flowmeter detector pipe axis must be aligned with the pipeline axis on both

upstream and downstream sides. This is essential to have stable characteristics of flow

measurement (especially for flowmeters with meter sizes of 50 mm or less).

* In the case of a detector using teflon PFA lining, bolts may get loose with time because of

plastic deformation of teflon. Tighten them periodically.

Converter

Packing

Flow direction

Upstream flange

Detector

Figure 4.3 FMG400 Series flange type flowmeter-piping connections

Packin

Upper mounting bolts

Lower mounting bolts

Downstream flange

18

4.3 Piping Connections

(1)

(2)

(3)

)

(1) Required Pipe Length

If various joints are used upstream of the detector outlet, the straight pipe length as shown in

Table 4.2 is required.

Table 4.2 Required straight pipe length on the upstream side

90° bent

Tee

Diffuser

(4)Fully opened sluice valve

Detector

Detector

Detector

5. Other valves (not fully opened

Detector

L: Required straight pipe length—straight pipe length plus half-length of the detector.

D: Nominal bore size (diameter)

NOTES

1. The length of a reducer, if connected, can be counted as a part of the straight pipe length.

2. No straight pipe length is needed on the downstream side. If a butterfly valve is installed

downstream of the detector, do not let the valve plate protrude into the pipe of the detector.

19

(2) Pipe Orientation

The detector may be installed in horizontal, vertical or sloping pipe runs as shown in Figure 4.4.

However, except for horizontal installation, fluid should flow from lower to upper directions.

See Figure 4.4.

Flow direction

(a) Horizontal pipe installation

(b) Vertical pipe installation

(c) Sloping pipe installation

Detector

Ground surface

Figure 4.4 Detector Piping Orientation

The electrodes should be positioned horizontally against the ground surface in any piping

installation. See Figure 4.5.

Detector

-

-

Figure 4.5 Installation position of the detector

20

(3) Flow Direction

Install

the detector in accordance with the flow direction arrow on the detector. See Figure 4.6. If

the

actual flow runs opposite to the specified flow direction, the following display and output

appears. (For bi-directional multi-range measurement, see 10.3, “Multi-range Functions.”).

• LCD display : Instantaneous flow rate—indicates negative values,

Totalized flow—no counts added.

• Output: Current output— 4.0 mA output; Pulse output—No pulses

Figure 4.6 Flow direction arrow on the detector

(4) Preventing an Empty Pipe Condition

Design an upright pipe run (Figure 4.7) or sufficient head pressure (Fig. 4.8) at the downstream

detector outlet if there is a possibility of the detector pipe becoming emptied.

Figure 4.7 Detector with an upright pipe run at downstream outlet

Figure 4.8 Detector with sufficient head pressure at downstream outlet

21

(5) The pipes on both sides of the installation location of the detector should be fixed by attaching

support fittings, etc. Supporting the pipes will not only reduce piping vibration but also

prevent damages to the piping due to dead weight of the electromagnetic flowmeter and

weight of the fluid. (See Figure 4.9 and Figure 4.10.)

Piping support fitting Piping support fitting

Figure 4.9 Example of Pipe Fixing Method

Figure 4.10 Unsupported Piping Model

22

5. Wiring

CAUTION

Do not work on piping and wiring with

wet hands.

Wet hands can cause
system failure.

DON’T

 Do not modify or disassemble the
FMG400 Series unnecessarily.

Modifying or
disassembling this product

DON’T

Flowmeter accuracy may be affected by the way wiring is executed. Proceed with wiring

taking the following precautions:

(1) Select the cable runs away from electrical equipment (motors, transformers, or radio

transmitters) which causes electromagnetic or electrostatic interference.

(2) Deterioration of flowmeter circuit insulation occurs if the converter interior or cable

ends get wet or humidified. This in turn causes malfunction of the flowmeter or noise
problems. Avoid a rainy day if the flowmeter is to be installed outdoors. Even indoors,
prevent water from splashing over the flowmeter. Try to finish the wiring as quickly as
possible.

can cause electric shock,

malfunction of or damage

to this product.

 Ground the FMG400 Series properly.

Operating this product

without a grounding can

DO

cause system malfunction

The label shown left is placed
near the terminal board for
power input.
Be alert to electric shock.

(3) The converter has a surge-absorbing barrier installed inside. Therefore, do not conduct

a withstand voltage test for the converter. To check the insulation of the converter, use
a voltage of 250 V

dc or less.

23

5.1 Cables

Use the kind of cables shown in Table 5.1 to wire the converter.

Table 5.1 Cables

Name Cable type

Power cable

Three-wire sheathed

Nominal cross­sectional area

2 mm² 11 to 13 mm

Overall
diameter

cable (Note)

I/O cable

The number of wires for the output cable depends on the
system specifications. Use a shielded cable with nominal
cross-sectional area of 1.25 mm² and overall diameter of
11 to 13 mm.

Note: Use a four-wire cable if the arresters are to be used. See Figure 5.1 below.

5.2 External Device Connections and Grounding

The terminal board connections of the FMG400 Series flowmeter are shown in Figure 5.1.

Proceed with wiring as described in Section 5.4, “Wiring Procedure.”

If power supply is specified as DC, use L1 as positive (+) and L2 as negative (–) terminals.

1

To use the arresters, ground the GND terminal using a wire shown in broken line.

*

2

Locate an external double-pole power switch on the power line near the flowmeter and within

*

easy operation.
Mark on the switch as the disconnecting device for the flowmeter.
Use the proper switch as follows.

Recommended switch rating; Rating AC250V 6A or more

Inrush current 15A or more

Figure 5.1 Terminal Board Connections

24

IMPORTANT

(1) The grounding terminal of the FMG400 Series flowmeter should be grounded with

100 ohm or less ground resistance. Use a heavy copper braid or wire (cross-sectional
area 5.5 mm
terminal is M4 size and an M4-size crimped ring lug should be used to connect the
wire to the terminal. Avoid a common ground where earth current may flow.
independent
and non-conductive pipeline grounding procedures.

(2) To prevent a two-point grounding, ground the shielded cable on the receiving

instrument side.

2

minimum) to ground the terminal and make it as short as possible. The

An

ground is preferable. See Figure 5.2. for a conductive pipeline grounding

 If connection pipe is conductive:

(1) Connect between the grounding

terminal

and both ends of the mating
flanges with a heavy copper braid or
wire (cross sectional area 5.5 mm
minimum).

(2) If the conductive pipe is not

grounded

to a

good earth ground, use
the same type of copper braid or
wire

to

ground the terminal with 100

ohm or less ground resistance.

Grounding terminal

Grounding wire

 If connection pipe is non-conductive:

(1) Use a heavy copper braid or wire

(cross sectional area 5.5 mm²
minimum) to ground he terminal with

2

100 ohm or less ground resistance.

25

Figure 5.2 Grounding Procedure

26

5.3 Digital I/O Connections

(

)

r

Digital I/O terminals consist of contact output terminals, voltage signal input terminal (DI), and

signal common terminal (COM). Each terminal (DO1, DO2 and DI) is isolated from internal

circuits. Terminal (COM) is the signal common for the other three terminals (DO1, DO2 and

DI).

Functions can be assigned for each terminal with the LCD control keys. See Chapter 10,

“Digital I/O Functions.”

To connect an electromagnetic relay or counter to the contact output terminal (DO1 or DO2),

put a surge-absorbing diode into the input circuit of the relay or counter. See Figure 5.3 for an

example of electromagnetic counter connection.

Solid-state relay Transistor open collector

Resisto

COM DI DO2 DO1

Diode

Note

* Note. Be sure to use a surge absorption diode with a rated current of 1 A and rated withstand

voltage of 200 V Min.

Figure 5.3 Electromagnetic Counter Connection Example

Power supply

27

5.4 Wiring Procedure

Cable termination and cable connections are described below.

5.4.1 Cable Termination

CAUTION

 Do not conduct wiring work when

power is applied.

Wiring while power is
applied can cause electric

DON’T

Use cables as specified in Table 5.1. Remove about 30 mm of the end of cable sheath to expose

the two coated wires and then strip the wires about 10 mm. Then attach an M4-size crimped

ring-lug to the end of each wire using a compression tool. The crimped ring-lug should be of

the kinds with insulated sleeve to prevent shorts between adjacent terminals. The overall length

of the wire with the M4-size ring-lug attached should be about 35 mm. See Figure 5.4.

shock.

35 mm

 Do not work on piping and wiring

with wet hands.

Wet hands may result in
electric shock.

DON’T

Figure 5.4 Termination of cables

5.4.2 Cable Connections

Connect the terminated cable wires to the terminal board as described below.

IMPORTANT

Connect the wires securely to the terminal board. A loose connection may result in

unsatisfactory flowmeter performance. Make sure the wires are securely connected.

28

(1) Remove the cap nut from the cable gland and put the terminated cable through the cap nut,

seal ring, and packing as shown in Figure 5.5 on the right. The blank plate inside the cable

gland used when shipped is not needed once the cable is wired.

Figure 5.5 Cable connections

(2) Remove the housing cover for the terminal board shown in Figure 3.1. The terminal board is

located inside the converter as shown in Figure 3.2. Connect the crimped terminal of each

wire to the specified pin of the terminal board. See Figure 5.1 for the terminal board

configuration. Tighten each crimped terminal to the terminal board with a screw using a

Phillips screwdriver as shown in Figure 5.6. Loose connection may result in unsatisfactory

flowmeter performance. Make sure the wire is securely connected.

Figure 5.6 Terminal board connections

NOTE

The appropriate torque for tightening the terminal board screws is 1.2 Nm (12 kgf·cm).

29

(3) After the terminal board connection, pull the cable a little so that the cable runs straight from

the terminal board without unnecessary winding.

However, if the sheath-removed part goes as far as where the packing is located, air may

leave through there and the airtight structure may not function. See the incorrect example in

Figure 5.7. Then tighten the cap nut with a wrench.

Figure 5.7 Cabling Procedure

(4) Attach the terminal cover and screw the housing cover for the terminal board. To keep the

housing seal, tighten the cover securely, using a tool fitting with the groove on the cover.

30

6. Operation

CAUTION

 Do not touch the FMG400 Series main

body when high temperature fluid is
being measured.

The fluid raises the main
body temperature and can

DON’T

6.1 Preparatory check

Follow the procedure described below to prepare before starting the flow measurement.

System Check

 Check the wiring between the converter and related instruments.

 Make sure all the bolts of connection flanges on which the flowmeter is

mounted securely tightened.

 Make sure the direction of flow arrow is in accordance with actual flow.

 Make sure the flowmeter is grounded with 100 ohm or less ground resistance.

cause burns when touched.

 Make sure the converter housing covers are securely tightened.

Placing System On-Stream

 Let the fluid go through the detector pipe. When the detector is filled with the

fluid, stop the fluid and keep it still in the detector pipe.

Supplying Electric Power

 Make sure the power supply is as specified.

Checking Converter Parameters

 Check the configuration parameter settings. Refer to Chapter 7, “LCD

Display and Controls,” along with Chapter 8, “Configuration Parameter
Setting”.

Zero Adjustment

 Wait for 30 minutes to warm up the flowmeter. Then making sure the fluid

holds still in the detector pipe, starts the zero adjustment. Refer to 6.2, “Zero
Adjustment.”

On-line measurement

 After checking the items and conducting the zero adjustment as listed above,

let the fluid go through the detector pipe. Output (4–20 mA dc) directly
proportional to the flow rate can be obtained.

31

6.2 Zero Adjustment

To conduct zero adjustment of the flowmeter, the fluid in the detector pipe must be held still.

To start the zero adjustment is pressing a combination of control keys for the model with LCD

display (see 8.2.8, “Zero Adjustment”).



Press the zero adjustment switch for more than 3 seconds.

(Note that once the zero adjustment is started, there is no way to cancel the zero adjustment

sequence.)



An LED lamp is ON during zero point adjustment.



Then the LED indicator lights and the zero adjustment sequence will start. The zero

adjustment sequence lasts about 3 to 6 seconds. (Zero adjustment duration depends on the

excitation current frequency. It takes about 3 seconds for 24 Hz setting and about 6

seconds for 12 Hz and 6 Hz settings.)

When the zero adjustment sequence ends, the LED indicator goes off.

To conduct the zero adjustment, it is necessary to open the converter housing cover and press

the switch. Observe the following precautions when you open the housing cover:

(1) Do not open the cover in the open air unprotected against rain or wind.
If you adjust the flowmeter in the rain, this can cause electric shock or damage to the

flowmeter electronics. If wind blows against the internal circuitry of the converter, output
may fluctuate and fail to indicate correct measuring values.

(2) Do not conduct the zero adjustment when the ambient humidity is high. By opening the

cover in high humidity conditions, the measuring accuracy may be reduced or damage
caused to the flowmeter electronics.

32

7. LCD Display and Controls

You can select the operation mode, change the configuration parameters or execute

operation-specific functions using the control keys on the panel. How to operate these

keys is described in this chapter.

7.1 Outline

The Converter has a LCD display. The LCD display can be used to set and indicate various

configuration parameters. Figure 7.1 shows the front view of LCD display.

FMG400 Series

LCD display

Figure 7.1 Converter with LCD display

 LCD display (2-line × 16-character)

The backlit display enables an easy-to-read indication even under poor lighting conditions.

Instantaneous flow rates or totalized flow in the measurement mode, or configuration

parameters in the setting mode can be displayed.

33

Control keys

 Control Keys

Changing the operation mode, checking or changing parameters can be done with these keys.

To operate these keys, you have to open the converter housing cover. Observe the following

precautions when you open the housing cover:

(1) Do not open the housing cover in the open air unprotected against rain or wind.
If you open the housing cover in the rain, it can cause electric shock or damage to the

flowmeter electronics. If wind blows against the internal circuitry of the converter, output
may fluctuate and fails to indicate correct measuring values.

(2) Do not open the housing cover when the ambient humidity is high. By opening the cover

in high humidity conditions, the measuring accuracy may be reduced or damage caused to
the flowmeter electronics.

Functions of each control key when pressed are shown in the table below.

Control keys Basic functions of control keys



Goes into the item selection sequence.



SET

5

4

Goes into the detailed-item specifying sequence for each selected item in
measurement, setting or calibration modes.



Stores the selected data in the setting mode.



Changes items (alphabet letter and number) in the items selection
sequence, and changes parameters (numbers and/or units) in the detailed­item specifying sequence in measurement, setting or calibration modes.



Starts and stops the totalizer in the measurement mode. (Note)



Changes digits (alphabet letter and number) in the items selection
sequence, and starts the detailed-item specifying sequence by indicating
the left-most digit with the cursor.

 Moves the cursor from left to right (from the right end reverts to the left

end) in the above sequence.



Resets the totalizer in the measurement mode. (Note)

Note: To operate the totalizer, it is preferable to set the indicating unit (UNIT 1 and/or UNIT 2)

to one of the units appropriate for totalization just to make sure it is operating correctly. See 10.2,

“Totalizer and Pulse Output.”

34

7.2 Display Format

In the measurement mode, measured data are displayed in UNIT 1 (primary indicating unit)

and UNIT 2 (secondary indicating unit). As to indicating units, see 8.2.4, “Indicating Unit.”

Display Format

 Measured Value Display Forma

(1) Flow rate

t

35

(2) Totalizer

(3) Volumetric flow

“C” is indicated when totalized flow is counted.

Increments per counting rate. Refer to 8.2.10,

“Counting Rate.”

Wraps around after 99999999.

“F” for forward and “R” for reverse direction flow

will be displayed

Displays down to the smallest digit of

“C” is indicated when volumetric flow is counted.
The unit of flow
8 digits (99999999) maximum including decimal point

(4) % display

If the flow count exceeds 99999999, wraps around.

“F” for forward and “R” for reverse direction flow

will not displayed.

Displayed down to 0.1 %.

Displays up to 125.0 %.
Flow direction: Forward “

“ (blank space);

Reverse “-“

36

7.3 Basic operations

Flow measurement in the measurement mode, checking or changing configuration

parameters in the setting mode and a converter unit check in the calibration mode are

the basic operations of the converter.

7.3.1 Mode Change

The converter has three operation modes: measurement, setting and calibration. The system

stays in the measurement mode after the power is turned on. To change the mode to the setting

or calibration mode, press [SET] and select the desired item using

return to the measurement mode, select “0” (MEASURE MODE) for the number column of

configuration items (such as A0 or B0) . See 7.4, “Configuration Items Selection Table.”

 Measurement mode:

process values. The flowmeter can measure the flow velocity, flow rates, or totalized flow.

The flowmeter first goes into this mode when power is turned on.

 Setting mode:

measurement mode. These parameter values are displayed while checking or changing these

values but the flowmeter outputs the measured process values as in the measurement mode.

See 7.4, “Configuration Items Selection Table” and 8.2, “Checking or Changing

Parameters” for details. Configuration items are from A1, A2, A3 to M1.

 Calibration mode:

simulation signal is used to check the measuring span and excitation current value. The

current output of the flowmeter changes in accordance with the simulation signal. The

status of each digital output is held to the value just before the system moved into the

calibration mode. See 7.4, “Configuration Items Selection Table” and Chapter 9,

“Calibration” for details. Configuration items are from N1 to N4.

used to check or change various configuration parameters used in the

measures the process flow and displays and outputs the measured

used to check the converter internal circuits. The internally generated

[4]

and

[5]

keys. To

37

7.3.2 Configuration Parameter Selection in Setting and Calibration Modes

Follow the procedure described below to select configuration items in the setting and

calibration modes. The key on the left should be pressed to start each sequence described on

the right.

Measurement mode

Goes into the item selection sequence. In this sequence, each

SET

4

item is indicated by a combination of an alphabet letter and a
number.

Selects the desired item (indicated by an alphabet letter and a
number) first by selecting the digit (alphabet or number) with

[4]

and then changing the value with

[5]

5

SET

4

4

5

SET

SET

SET

Displays the parameter for the selected item.

Goes into the parameter changing sequence. The digit
indicated by the cursor can be changed.

Changes

the cursor) using

with

Flickers the selected value and/or unit to confirm changes
made for the selected item.

Stores the indicated value and/or unit and stops flickering of
the data.

Returns to the items selection sequence.

the value and/or unit first by selecting the digit (with

[4]

and then changing the value or unit

[5].

(Note 2)

(Note 1)

Notes

1. To return to the measurement mode, select “0” (MEASURE MODE) for the number

column of any items (such as A0 or B0).

2. To return to the parameter changing sequence, press

38

[5].

7.4 Configuration Items Selection Table

In the setting and calibration modes, configuration items can be selected as shown below. For

example, the excitation current can be selected by the item A1. To change the parameters for

the selected items, see the following chapters. To return to the measurement mode, select “0”

for the number (such as A0 or B0).

Setting mode items (A1, A2, A3 to M1): See Chapter 8, “Configuration Parameter Setting.”

Calibration mode item (N1 to N4): See Chapter 9, “Calibration.”

0123456

Excitation

*

A

Current

Indicating

*

B

Unit 1

Range Type Range 1 Range 2 Range 3 Range 4 Range

*

C

Damping

*

D

Constant

Zero

*

E

Adjustment

DO1

*

F

Function

Counting

*

G

Rate

Preset Count

*

H

High Alarm

*

I

Set

Meter Size Excitation

Frequency

Indicating
Unit 2

Low Cutoff

DO2
Function

Pulse Width

High Alarm
Value

DI Function

Low Alarm
Set

Hysteresis

Low Alarm
Value

Empty Pipe

*

J

Alarm

Rate-of-

*

K

change Limit

Fixed-value

*

L

Output

Zero Offset

*

M

Adjustment

Flow Rate

*

N

Cal 0%

* Returns to the measurement mode.

Control Limit
Time

Fixed-current
Output

Flow Rate
Cal 50%

Fixed-pulse
Output

Flow Rate
Cal 100%

39

8. Configuration Parameter Setting

8.1 Configuration Items

To check or change parameters, first select the desired configuration item as described in 7.3.2.

The configuration items are listed below. See each section for detailed procedure.

The default set value in each configuration item is shown in Appendix 2.

Section Configuration item Display example Page

8.2.1

8.2.2

8.2.3

8.2.4

8.2.5

8.2.6

8.2.7

8.2.8

8.2.9

8.2.10

8.2.11

8.2.12

Excitation Current

Meter Size

Excitation Frequency

Indicating unit

Range Type

Span (range)

Hysteresis

Damping Constant

Low Cutoff

Zero Adjustment

Digital I/O

Counting Rate

Pulse Width

Preset Count

High/Low Alarm

Alarm Limit Value

A1: EX. CURR. 0.2100 A

A2: METER SIZE 50 mm

A3: EX. FREQ. 24 Hz

B1: UNIT 1 m/s

C1: RANGE TYPE

C2: RANGE 1

C3: RANGE HYST

D1: DAMPING 05.0 SEC

D2: LOW CUT 05.0 %

E1: ZERO ADJUST 00.1 %

F1: DO1 FUNC. 1: H ALM

G1: COUNT RATE

G2: PLS. EIDTH

H1: PRESET 009000

I1: H. ALARM SET

I2: H. ALARM VAL

1:SINGLE

01.000 m/s

05.0 %

6.00E-1l

020 m/s

ON

+100.0 %

40

41

42

44

46

51

52

53

54

56

58

59

8.2.13

8.2.14

8.2.15

8.2.16

Empty Pipe Alarm

Rate-of-change Limit

Control Limit Time

Fixed-value Output

Zero Offset Adjustment

J1: EMPTY ALM ON

K1: LIMIT RATE

K2: LIMIT TIME

L1: FIXED OUT OFF

M1: MANUAL ZERO -000.1 %

40

05.5 %

01 SEC

62

63

65

68

8.2 Checking or Changing Parameters

8.2.1 Excitation Current

Proceed as follows to check or change the excitation current setting value.

 To check the exciting current setting value:

Key operation Display example Description

A1: EX. CURR.

0.2100A

SET

SET



To change the excitation current setting value:

A1: EX. CURR.

Press [SET] first to start the item selection sequence
and select

configuration items using

Then press [SET] again to display the exciting
current setting value.

Pressing [SET], the system returns to the items
selection sequence.

A1: EX. CURR.

[5]

from among the

[4]

and

keys.

IMPORTANT

The exciting current value is factory set when shipped. Do not change the value unless the
value differs from that written on the nameplate of the flowmeter.

The following example shows how to change the excitation current setting value from 0.1900A
to 0.2150A.

Key operation Display example Description

SET

4

5

A1: EX. CURR.

0.1900A

A1: EX. CURR.

0.1900A

A1: EX. CURR.

0.2900A

0.2100A

0.2150A

Press [SET] first to start the item selection sequence
and select

configuration items using

Then press [SET] again to display the excitation
current setting value (0.1900 A in this example).

Pressing

as many times as necessary to move the cursor to
the digit to be changed.

Change the value by pressing

cursor to another digit by pressing

the value. In this example repeat this process until
the display shows “0.2150A.”

A1: EX. CURR

[4]

, the cursor appears. Then press

from among the

[4]

and

[5].

(Note)

[5]

keys.

Then move the

[4]

and change

[4]

A1: EX. CURR.

SET

SET

Note:

The valid range is from 0.0500A to 0.2300A. If you try to set the value above 0.2300A,

the error message

A1: EX. CURR.

*

H. OVER SPEC appears. Set the value within the valid range.

0.2150A

Pressing [SET], the cursor disappears and the
changed display flickers. Press [SET] again to save
the value.

Pressing [SET], the system returns to the items
selection sequence.

41

8.2.2 Meter Size

Proceed as follows to check or change the meter size of the detector.

 To check the meter size:

Key operation Display example Description

A2: METER SIZE

50 mm

SET

SET

 To change the meter size:

IMPORTANT

Meter size is factory set when shipped. Do not change the meter size unless it differs from
the specified value.

The following example shows how to change the meter size from 50 mm to 100 mm.

Key operation Display example Description

SET

4

A2: METER SIZE

A2: METER SIZE

50 mm

A2: METER SIZE

50 mm

Press [SET] first to start the items selection
sequence

the configuration items using

Then press [SET] again to display the current
meter size.

Pressing [SET], the system returns to the items
selection sequence.

Press [SET] first to start the items selection
sequence

the configuration items using

keys. Press [SET] again to display the current
meter size (50 mm in this example).

Pressing

and select

and select

[4]

A2: METER SIZE

[4]

A2: METER SIZE

the cursor appears.

and

[4]

from among

[5]

keys

from among

[5]

and

A2: METER SIZE

5

A2: METER SIZE

SET

SET

Note:

The meter size is changed as shown below by pressing

the range between 15 mm (0.5 in) and 100 mm (4in).

2.5 mm 15 mm 100 mm 400 mm 0.1 in 0.5 in 4 in 16 in

If the meter size has been changed, other setting values (such as span and counting rate) will be

affected depending on the measuring unit used. Therefore, check those setting values if you

have changed the meter size.

A2: METER SIZE

100 mm

100 mm

Select “100 mm” by pressing

as necessary.

Pressing [SET], the cursor disappears and the
changed display flickers. Press [SET] again to
save the value.

Pressing [SET], the system returns to the items
selection sequence.

(Note)

[5].

[5]

as many times

However, select a size in

42

8.2.3 Excitation Frequency

Proceed as follows to check or change the excitation frequency.

 To check the excitation frequency:

Key operation Display example Description

A3: EX. FREQ.

24 Hz

SET

A3: EX. FREQ.

SET

 To change the excitation frequency:

The excitation frequency can be selected from 6 , 12 and 24 Hz. The characteristics of the

flowmeter change in accordance with the selected frequency as shown below. 24 Hz is the

default setting when shipped from the factory.

Excitation frequency 6 Hz 12 Hz 24 Hz

Zero point stability Good

Press [SET] first to start the item selection
sequence and select

the configuration items using

keys. Then press [SET] again to display the
current excitation frequency.

Pressing [SET], the system returns to the items
selection sequence.

A3: EX. FREQ.

[4]

from among

and

[5]

Response time Good

Fluid noise resistant Good

43

The following example shows how to change the excitation frequency from 24 Hz to 12 Hz.

Key operation Display example Description

SET

4

5

SET

SET

A3: EX. FREQ.

24 Hz

A3: EX. FREQ.

24 Hz

A3: EX. FREQ.

12 Hz

A3: EX. FREQ.

12 Hz

A3: EX. FREQ.

Press [SET] first to start the item selection
sequence and select

the configuration items using

keys. Press [SET] again to display the current
excitation frequency (24 Hz in this example).

Pressing

Select “12 Hz” by pressing

excitation frequency changes as follows:
6 Hz 12 Hz 24 Hz

Pressing [SET], the cursor disappears and the
changed display flickers. Press [SET] again to
save the value.

Pressing [SET], the system returns to the items
selection sequence.

[4],

A3: EX. FREQ.

the cursor appears.

[5]

from among

[4]

and

twice. The

[5]

44

8.2.4 Indicating Unit

You can select one of the 16 engineering units listed below as an indicating unit.

Flow velocity:

•

Flow rate:

•

m/s, (ft/s)

m³/s, m³/min, m³/h

l

/s, l/min, l/h

ml/s, ml/min, ml/h

(gal/s), (gal/min), (gal/h)

Volumetric flow:

•

(totalized flow)

Other units:

•

m³, l, ml, (ga

%, COUNT (totalized flow without a unit), RANGE (1 to 4)

l)

Notes

1.

Units in parentheses, such as “gal” and “ft” are shown only when the meter size is
selected in inches. They are not shown when the meter size is selected in mm.

2.

If COUNT or RANGE is selected, the display is shown as follows:

COUNT: displays totalized flow counts (8 digits) without a unit.

RANGE: displays the range number (1 to 4).

Two indicating units (primary unit: UNIT 1, secondary unit: UNIT 2) can be selected.

Proceed as follows to check or change these two indicating units.

 To check the indicating units:

Key operation Display example Description

B1: UNIT 1

%

SET

B1: UNIT 1

SET

Press [SET] first to start the items selection
sequence and select

configuration items using

Then press [SET] again to display the current
primary indicating unit.

Pressing [SET], the system returns to the items
selection sequence.

B1: UNIT 1

[4]

from among the

and

[5]

keys.

Primary indicating unit and secondary indicating unit can be selected by the following

configuration items:

B1: UNIT 1 primary indicating unit

B2: UNIT 2 secondary indicating unit

45

 To change the indicating unit:

The following example shows how to change the primary indicating unit from % to ml/s.

Key operation Display example Description

SET

4

5

4

5

SET

SET

B1: UNIT 1

%

B1: UNIT 1

%

B1: UNIT 1

ml

B1: UNIT 1

ml _

B1: UNIT 1

ml/s

B1: UNIT 1

ml/s

B1: UNIT 1

Press [SET] first to start the items selection
sequence to select

configuration items using

Then press [SET] again to display the current
primary indicating unit (% in this example).

Pressing

Select “ml” as the first unit of primary indicating

unit by pressing

(Note1)

Pressing [
(time unit) of primary indicating unit.

Select “s” as the second unit (time unit) of primary

indicating unit by pressing

necessary.

Pressing [SET], the cursor disappears and the
changed display flickers. Press [SET] again to
save the unit.

Pressing [SET], the system returns to the item
selection sequence.

[4]

4

], the cursor moves to the second unit

(Note 2)

B1: UNIT 1

[4]

, the cursor appears.

[5]

as many times as necessary.

[5]

from among the

and

as many times as

[5]

keys

Notes

1. The first unit (volumetric units etc.) changes as shown below:

% m³

RANGE COUNT (ft/s) m/s

Units in parentheses, such as “gal” and “ft” are shown only when the meter size is
selected in inches. They are not shown when the meter size is selected in mm.

2. The second unit (time unit) changes as shown below:
/s /min /h __

l ml

(gal)

46

8.2.5 Span (range)

You can set the following constants in this setting item:

1. Range type

2. Span

3. Unit of span (can be changed only in range 1)

4. Hysteresis

(1) Range type

You can select a single range or multiple ranges. Select one from five types shown below:

Range type Description

1. SINGLE Single range

2. 4F-0R Unidirectional flow, automatic selection of multiple ranges

3. 2F-2R Bi-directional flows, automatic selection of multiple ranges

4. EXT.2F-0R

5. EXT.2F-2R

Unidirectional flow, multiple ranges selected by external
signal
Bi-directional flows, multiple ranges selected by external
signal

(2) Span (range)



Span can be set and displayed as follows for flow velocity and flow rates:

•

Flow velocity: 01.000 m/s (three digits after the decimal point)

•

Flow rates: 2.83E+3 m³/H (three digits and exponential)



Valid range of span is 0.1 m/s to 10 m/s in terms of flow velocity.

If you try to set the span outside of this range, one of the following messages appears:

*

H. OVER SPEC. (if the set value exceeds 10 m/s)

*

L. OVER SPEC. (if the set value is less than 0.1 m/s)

Try again to set the span within the specified range.



When multiple ranges are used, the following must be observed:

•

Range 1 > Range 2 > Range 3 > Range 4 (unidirectional flow, multiple ranges)

•

Range 1 > Range 2, Range 3 > Range 4 (bi-directional flows, multiple ranges)

If you try to set the ranges not conforming to the above, the following message appears:

*

MULTI RNG ERR

Try again to set the ranges as specified above.



Totalization counting rate

If you have changed the span while the counting rate is set for totalization, the counting
rate for 100% output may have exceeded the maximum counting capacity.
In this kind of event, the following message appears and the system goes to the counting
rate setting sequence.

*

H. OVER C RATE or L. OVER C RATE

Set the counting rate for the newly set span.

47

(3) Unit of span

You can select one of the following 10 engineering units as a unit for the span. The unit is
set for the range 1 and the same unit applies automatically to other ranges—range 2, range
3 and range 4.

•

Flow velocity:

•

Flow rate:

m/s, (ft/s)
m³/s, m³/min, m³/h

l

/s, l/min, l/h
ml/s, ml/min, ml/h
(gal/s), (gal/min), (gal/h)

Units in parentheses, such as “gal” and “ft” are shown only when the meter size is selected

in inches. They are not shown when the meter size is selected in mm.

If you change the unit, the new span based on the newly set unit will be automatically
displayed.

(4) Hysteresis

The hysteresis is the dead band used when multiple ranges are switched. The hysteresis can

be set from 0 to 25% in increments of 0.1%. The hysteresis setting is needed only when

automatic selection of multiple ranges is used.

[The setting sequence]

The following is the setting sequence of span (range).

Span (range) item selection

Range type setting

Range 1 span and unit setting

Range 2 span setting

Range 3 span setting

Range 4 span setting

Hysteresis setting

If a single range is selected, range 2 to range 4 and hysteresis settings will be bypassed.

Proceed as follows to check or change each constant.

48

 To check each constant:

Key operation Display example Description

C2: RANGE 1

02.000 m/s

SET

C2: RANGE 1

SET

Range type, Span. Hysteresis can be selected by the configuration items as follows:

Range type C1: RANGE TYPE

Span of Range 1 C2: RANGE 1

Span of Range 2 C3: RANGE 2

Span of Range 3 C4: RANGE 3

Span of Range 4 C5: RANGE 4

Hysteresis C6: RANGE HYST

 To change the range type:

Range type should be changed before changing the span.

Press [SET] first to start the items selection
sequence

configuration items using

Then press [SET] again to display the current span
for Range 1.

Pressing [SET], the system returns to the items
selection sequence.

and select

C2: RANGE 1

[4]

and

from among the

[5]

keys.

The following example shows how to change the range type from 1 to 3.

Key operation Display example Description

SET

4

5

SET

SET

C1: RANGE TYPE

1:SINGLE

C1: RANGE TYPE
1: SINGLE

C1: RANGE TYPE

3:2F-2R

C1: RANGE TYPE

3:2F-2R

C1: RANGE TYPE

Press [SET] first to start the items selection
sequence

among the configuration items using

[5]

current range type.

Pressing

Select Range type 3 (3: 2F-2R) by pressing
twice.

Pressing [SET], the cursor disappears and the
changed display flickers. Press [SET] again to
store the changed type.

Pressing [SET], the system returns to the items
selection sequence.

and select

keys. Then press [SET] again to display the

[4],

C1: RANGE TYPE

the cursor appears.

[4]

from

and

[5]

49

 To change the span (range):

The following example shows how to change the span of Range 1 from 2.0 m/s to 100 l/min.

Key operation Display example Description

SET

4

5

4

5

SET

SET

C2: RANGE 1

02.000 m/s

C2: RANGE 1

02.000 m/s

C2: RANGE 1

3.93E+0 l/s

2.36E+2 l/min

C2: RANGE 1

2.36E+2 l/min

C2: RANGE 1

1.36E+2 l/min

1.00E+2 l/min

C2: RANGE 1

1.00E+2 l/min

C2: RANGE 1

Press [SET] first to start the items selection
sequence and select

configuration items using

Then press [SET] again to display the current span
of Range 1 (2.0 m/s in this example).

Pressing

[4]

cursor to the position for the measuring unit.
Select “l” as the first unit of the measuring unit by

pressing

(Note1)

cursor to the second unit (time unit), select “min.”

(Note 2)

changes in accordance with the newly selected
unit.)

Press

the cursor to the digit of span to be changed.

Change the value by pressing

the cursor

change the value. In this example repeat this
process until the display shows “1.00E+2”(=100)

l

/m.

Pressing [SET], the cursor disappears and the
changed display flickers. Press [SET] again to
store the changed span and unit.

Pressing [SET], the system returns to the items
selection sequence.

[4],

as many times as necessary to move the

[5]

Similarly, pressing

(The displayed span automatically

[4]

as many times as necessary to move

to

C2: RANGE 1

[4]

the cursor appears. Then press

as many times as necessary.

another digit by pressing

from among the

[5]

and

[4]

to move the

[5]

Then move

[4]

keys.

and

Notes

1.

The first unit of the measuring unit changes as shown below:

m³ l m
m (ft) (gal)

Units in parentheses (ft and gal) are shown only when the meter size is selected in inches.

2. The second unit of the measuring unit changes as shown below:

/s /min /h

However, the following first and second unit combinations cannot be selected:

m/min, m/h, ft/min, ft/h.

l

50

 To change the hysteresis:

The hysteresis is set at 3% (default) when shipped from the factory.

The following example shows how to change the hysteresis from 3% to 5%.

Key operation Display example Description

SET

4

4

5

SET

SET

C6: RANGE HYST

03.0 %

C6: RANGE HYST

03.0 %

C6: RANGE HYST

03.0 %

C6: RANGE HYST

05.0 %

C6: RANGE HYST

05.0 %

C6: RANGE HYST

Press [SET] first to start the items selection
sequence

the configuration items using

Then press [SET] again to display the current
hysteresis (3.0% in this example).

Pressing

Press

to change.

Change the value to “5” by pressing [

(if necessary, move the cursor to another digit and
change the value).

Pressing [SET], the cursor disappears and the
changed display flickers. Press [SET] again to
store the changed hysteresis.

Pressing [SET], the system returns to the item
selection sequence.

and select

[4]

[4]

to move the cursor to the desired digit

C6: RANGE HYST

[4]

the cursor appears.

(Note)

from among

5]

and [

5]

keys.

twice.

Note:

If you try to set the hysteresis above 25.0 %, an error message “* H. OVER SPEC.”

appears. Try again to set the value within the specified range.

51

8.2.6 Damping Constant

The damping constant is used to moderate output fluctuations. (The larger the damping

constant, the more the output is averaged. But the response to an input change will be slower.)

The damping constant can be set as follows:

0.0 sec, 0.5 sec and 1 to 60 sec (in increments of 1 second)

Note:

0.0 sec setting will work as equal to 0.1 sec damping constant.

Setting value exceeding 60 sec will be automatically set to 60 sec.

Proceed as follows to check or change the damping constant.

 To check the damping constant:

Key operation Display example Description

D1: DAMPING

SET

D1: DAMPING

SET

 To change the damping constant:

The following example shows how to change the damping constant from 0.5 sec to 10 sec.

Key operation Display example Description

D1: DAMPING

SET

D1: DAMPING

4

D1: DAMPING

02.0 S

00.5 S

00.5 S

10.5 S

5

10.0 S

D1: DAMPING

SET

D1: DAMPING

SET

10.0 S

Press [SET] first to start the items selection
sequence and select

the configuration items using [

keys. Then press [SET] again to display the
current damping constant.

Pressing [SET], the system returns to the items
selection sequence.

Press [SET] first to start the items selection
sequence and select

the configuration items using [

keys. Then press [SET] again to display the
current damping constant (0.5 S.)

Pressing [

(If necessary, press [

the digit to be changed.)

Change the value to “1” by pressing [

move the cursor to another digit by pressing

4]

[

repeat this process until the display shows “10.0
S.”

Pressing [SET], the cursor disappears and the
changed display flickers. Press [SET] again to
store this data..

Pressing [SET], the system returns to the items
selection sequence.

4],

and change the value. In this example

(Note)

D1: DAMPING

4]

D1: DAMPING

the cursor appears.

4]

to move the cursor to

from among

and [

from among

4]

and [

5].

5]

5]

Then

52

8.2.7 Low Cutoff

The low cutoff is the value set just above 0% flow rate. Flow rates below this level are treated

as 0% and subsequent outputs as 0% current output. The low cutoff can be set from 0 to 10%

of the span and in increments of 0.1%.

Proceed as follows to check or change the low cutoff value.

 To check the low cutoff value:

Key operation Display example Description

D2: LOW CUT

01.0 %

SET

D2: LOW CUT

SET

 To change the low cutoff value:

The following example shows how to change the low cutoff value from 1.0 % to 3.0 %.

Key operation Display example Description

D2: LOW CUT

01.0 %

SET

D2: LOW CUT

01.0 %

4

Press [SET] first to start the items selection
sequence to select

configuration items using

Press [SET] again to display the current low cutoff
value.

Pressing [SET], the system returns to the items
selection sequence.

Press [SET] first to start the items selection
sequence and select

the configuration items using

keys. Press [SET] again to display the current low
cutoff value (1.0% in this example).

Pressing

[4]

changed.

[4]

to move the cursor to the digit to be

D2: LOW CUT

D2: LOW CUT

from among the

[4]

and

from among

[4]

the cursor appears. Then press

[5]

and

keys.

[5]

D2: LOW CUT

03.0 %

5

D2: LOW CUT

SET

D2: LOW CUT

SET

Note:

If you try to set the low cutoff value above 10 % of the span, an error message

*

H. OVER SPEC appears. Set the value within the specified range.

03.0 %

Change the value to “3” by pressing

(Note)

(If necessary, move the cursor to another digit by

[4]

pressing

Pressing [SET], the cursor disappears and the
changed display flickers. Press [SET] again to
store the value.

Pressing [SET], the system returns to the items
selection sequence.

53

and change the value.)

[5]

twice.

8.2.8 Zero Adjustment

To conduct the zero adjustment of the flowmeter, the fluid in the detector pipe must be held

still. (If the fluid cannot be stilled by any means, see 8.2.16, “Zero Offset Adjustment.”)

To start the zero adjustment, follow the procedure described below.

Key operation Display example Description

E1: ZERO ADJUST

01.0 %

SET

ADJUST READY

4

* ZERO ADJUST

SET

SET

Notes

1. To cancel the zero adjustment, press

E1: ZERO ADJUST

E1: ZERO ADJUST

01.1 %

00.0 %

Press [SET] first to start the items selection
sequence

among the configuration items using

[5]

current flow rate (1.0% in this example).

Pressing

shown left and the system is ready for zero
adjustment.

Pressing [SET], “
shown left and the system starts the zero
adjustment. The zero adjustment takes about 3 to
6 seconds.

Newly adjusted zero point appears.

Pressing [SET], the system returns to the items
selection sequence.

[5]

and select

keys. Then press [SET] again to display the

[4]

(Note 1)

(Note 2)

. The system returns to the point where zero

E1: ZERO ADJUST

ADJUST READY

, “

* ZERO ADJUST

from

[4]

and

” appears as

” appears as

point is displayed.

2. Zero adjustment duration depends on the excitation frequency (24 Hz: 3 sec, 12 Hz and

6 Hz: 6 sec).

54

8.2.9 Digital I/O

You can select the various digital I/O functions shown below. See Chapter 10 ,”Digital I/O

Functions.” for details.

 Digital Output Functions

DO1, DO2 items Digital output functions

0: NO USE

1: H ALM

2: L ALM

3: EMPTY ALM

4: RNG SIG 1

5: RNG SIG 2

6: PRESET

7: CONV. ALM

8: PULSE OUT

Note:

Pulse output can be chosen only for DO1.

Not used

High limit alarm output

Low limit alarm output

Empty pipe alarm output

Multi-range output No. 1

Multi-range output No. 2

Preset point output

Converter failure alarm output

Pulse output

(Note)

 Digital Input Function

DI function Digital input function

0: NO USE

1: C STA/STP

2: C RES/STA

Not used

Totalizer Start/Stop

Totalizer Reset/Start

3: RANGE SW

4: ZERO ADJ

5: FIXED OUT

Remote selection of multi-range

. Zero adjustment start

Fixed-value output control

55

Proceed as follows to check or change the digital I/O functions.

 To check the digital I/O functions:

Key operation Display example Description

F1: DO1 FUNCT.

1:H ALM

SET

F1: DO1 FUNCT.

SET

Digital output 1 (DO1), digital output 2 (DO2) and digital input (DI) can be selected by the

configuration items as follows:

Digital output 1 (DO1) F1: DO1 FUNCT.

Digital output 2 (DO2) F2: DO2 FUNCT.

 To change the digital I/O functions:

Digital input (DI) F3: DI FUNCT.

The following example shows how to change the DO1 function from No. 1 to No. 3.

Key operation Display example Description

F1: DO1 FUNCT.

1:H ALM

SET

Press [SET] first to start the items selection
sequence and select

the configuration items using

keys. Then press [SET] again to display the
current DO1 function.

Pressing [SET], the system returns to the items
selection sequence.

Press [SET] first to start the items selection
sequence and select

among the configuration items using

F1: DO1 FUNCT.

[4]

F1: DO1 FUNCT.

from among

and

[4]

[5]

From

and

4

5

SET

SET

F1: DO1 FUNCT.

1:H ALM

F1: DO1 FUNCT.

3:EMPTY ALM

F1: DO1 FUNCT.

3:EMPTY ALM

F1: DO1 FUNCT.

[5]

keys. Then press [SET] again to display the

current

Pressing

Change the value to “3” by pressing

Pressing [SET], the cursor disappears and the new
DO1 function display flickers. Press [SET] again
to save the new function.

Pressing [SET], the system returns to the items
selection sequence.

DO1 function (1: H ALM in this example).

[4],

the cursor appears.

[5]

twice.

56

8.2.10 Counting Rate (pulse rate)

When the totalizer is used for total flow measurement, per-count (pulse) value is the counting

rate. Pulse output is also available for external totalization. In this item, the counting rate and

the pulse width for pulse output can be checked or changed. The counting rate is set using three

digits and exponential quotient.

For example, 0.123 m

3

Æ 1.23E–1 m

3

(1.23 × 10-1 m3)

The integration count output is not affected by the display unit, but it is recommended to set

the integration unit as the display unit to check the operating status.

Proceed as follows to check or change the counting rate.

 To check the counting rate and pulse width:

Key operation Display example Description

SET

G1: COUNT RATE

1.00E–2m

3

Press [SET] first to start the items selection se­quench

the configuration items using

and select

G1: COUNT RATE

[4]

from among

and

keys. Then press [SET] again to display the
current counting rate.

G1: COUNT RATE

SET

Pressing [SET], the system returns to the items
selection sequence.

Counting rate and pulse width can be selected by the configuration items as follows:

Counting rate G1: COUNT RATE

Pulse width G2: PLS. WIDTH

[5]

NOTES

1. The counting rate should be set so that its rate for 100% flow rate output is within the

range from 3.6 to 3600000 pulses/h. If you try to set the counting rate outside of this range,
an error message * H. OVER SPEC or * L. OVER SPEC appears.

Set the counting rate within the specified range.

2. The pulse width should be set to 0.5 ms to 100 ms. If the pulse width is set to a value

greater than 100 ms, it will be forcibly set to 100 ms.

3. The pulse width should be set to less than half of the pulse rate for 100% flow rate output.

If the pulse width is set exceeding that limit, the same error message as above appears. If
the pulse width is set to 0 (zero), it will automatically be set to half of the pulse rate for
100% flow rate output.

4. To operate the totalizer, it is preferable to set the indicating unit (UNIT1 and/or UNIT 2)

to one of the units appropriate for totalization just to make sure it is operating correctly.

57

 To change the counting rate:

The following example shows how to change the counting rate from 0.01 m³ to 0.9 l.

Key operation Display example Description

SET

4

5

SET

SET

G1: COUNT RATE

1.00E–2m

G1: COUNT RATE

1.00E–2m

G1: COUNT RATE

1.00E–2l

9.00E–1l

G1: COUNT RATE

9.00E–1l

G1: COUNT RATE

3

3

Press [SET] first to start the items selection
sequence and select G1: COUNT RATE from

among the configuration items using

keys. Then press [SET] again to display the

[5]

3

current counting rate (1.00E–2m

Pressing

as many times as necessary to move the

[4]

cursor to of measuring unit.
Select “l” as the measuring unit by pressing

(Note)

[5].

Then move the cursor to the desired digit by

pressing

example repeat this process until the display
shows “9.00E–1l.”

Pressing [SET], the cursor disappears and the new
counting rate display flickers. Press [SET] again
to store the new counting rate.

Pressing [SET], the system returns to the items
selection sequence.

the cursor appears. Then press

[4],

and change the value. In this

[4]

= 0.01 m3).

[4]

and

Note:

The unit changes as shown below by pressing

m³ l ml (gal)

The unit in parentheses (gal) is shown only when the meter size is selected in inches.

However, if the unit of the count rate is set to "gal" and then the nominal diameter is
changed from inch unit to mm unit, the unit of the count rate will not be changed.

[5].

58

8.2.11 Preset Count Value

The preset count value is used to preset the totalizer. The preset count value can be set from 0

to 99999999.

NOTE

Totalizer counting is effective only for the specified direction flow.

To operate the totalizer, it is preferable to set the indicating unit (UNIT 1 and/or UNIT 2) to

one of the units appropriate for totalization just to make sure it is operating correctly.

Proceed as follows to check or change the preset count value.

 To check the preset count value:

Key operation Display example Description

H1: PRESET

00000300

SET

H1: PRESET

SET

 To change the preset count value:

The following example shows how to change the preset count value from 500 to 1000.

Key operation Display example Description

H1: PRESET

00000500

SET

H1: PRESET

4

5

SET

SET

00000500

H1: PRESET

00001500
00001000

H1: PRESET

00001000

H1: PRESET

Press [SET] first to start the items selection sequence
and select H1: PRESET from among the

configuration items using

press [SET] again to display the preset count value.

Pressing [SET], the system returns to the items
selection sequence.

Press [SET] first to start the items selection
sequence and select H1: PRESET from among the

configuration items using

Then press [SET] again to display the preset count
value (500 in this example).

Pressing

as many times as necessary to move the

[4]

cursor to the desired digit to be changed.

Change the value by pressing

the cursor

change the value. In this example repeat this
process until the display shows “1000.”

Pressing [SET], the cursor disappears and the new
preset count value display flickers. Press [SET]
again to save the new preset count value.

Pressing [SET], the system returns to the items
selection sequence.

the cursor appears. Then press

[4],

to

another digit by pressing

[4]

[4]

and

and

[5].

[5]

keys. Then

keys.

[5]

Then move

and

[4]

59

8.2.12 High and Low Limit Alarms

The high and low limit alarms can be set to output an alarm signal when the flow rate exceeds

the high or low limit set value. When this alarm occurs, H. ALARM or L. ALARM message

appears. This high and low limit alarm function can each be enabled or disabled in this item.

The high and low limit values can be set from –10% to 109.5% of the span of the range (Range

1) in increments of 0.5%.

Proceed as follows to check or change the high and low limit values.

 To check the high and low limit values:

Key operation Display example Description

I1: H. ALARM SET

ON

SET

I1: H. ALARM SET

SET

High/low limit alarm enable/disable status and high/low limit value can be selected by the

configuration items as follows:

High limit alarm enable/disable status I1: H. ALARM SET

High limit value I2: H. ALARM VAL

Low limit alarm enable/disable status I3: L. ALARM SET

Low limit value I4: L. ALARM VAL

Press [SET] first to start the items selection
sequence and select I1: H ALARM SET from

among the configuration items using

keys. Then press [SET] again to display the

[5]

high limit alarm enable/disable status.

Pressing [SET], the system returns to the items
selection sequence.

[4]

and

60

 To change the high/low limit alarm status and its alarm limit value:

The following example shows how to change the high limit alarm enable/disable status from OFF

to ON and change the high limit value from +100 % to +105 %.

Key operation Display example Description

SET

SET

5

SET

4

I1: H. ALARM SET

OFF

I1: H. ALARM SET

OFF

I1: H. ALARM SET

ON

I2: H. ALARM VAL

+100.0%

I2: H. ALARM VAL

+100.0%

Press [SET] first to start the items selection
sequence and select I1: H. ALARM SET from

among the configuration items using

keys. Then press [SET] again to display the

[5]

high limit alarm enable/disable status (OFF at this
point).

Pressing

Change the status by pressing

(Note 1)

Pressing [SET], the cursor disappears and the
changed status flickers. Press [SET] again to save
the status. Then the system goes to the item
I2: H. ALARM VAL, and displays the current high
limit value (+100.0%).

Move the cursor to the digit to be changed.

the cursor appears.

[4],

[5].

[4]

and

I2: H. ALARM VAL

+105.0%

5

I2: H. ALARM VAL

SET

I2: H. ALARM VAL

SET

Notes:

1. If the high limit alarm enable/disable status is set to OFF, the subsequent high limit

value setting sequence will not come out.

2. If you try to set the value above +110% or below –10% of the span, the error messages

*H. OVER SPEC or *L. OVER SPEC, respectively, appear. Set the high or low limit

value within the specified range.

+105.0%

Change the value to “5” by pressing

times. (Note 2)
(If necessary, move the cursor to another digit by

pressing

Pressing [SET], the cursor disappears and the
changed high limit value display flickers. Press
[SET] again to save the value.

Pressing [SET], the system returns to the items
selection sequence.

and change the value.)

[4]

[5]

five

61

 To change the high/low limit value:

The following example shows how to change the high limit value from +105 % to +103 %.

Key operation Display example Description

SET

4

5

SET

SET

I2: H. ALARM VAL

+105.0%

I2: H. ALARM VAL

+105.0%

I2: H. ALARM VAL

+103.0%

I2: H. ALARM VAL

+103.0%

I2: H. ALARM VAL

Press [SET] first to start the items selection
sequence

among the configuration items using

[5]

current high limit value (+105.0% in this
example).

Pressing

[4]

cursor to the digit to be changed.

Change the value to “3” by pressing

times as necessary. (Note)
(If necessary, move the cursor to another digit by

pressing

Pressing [SET], the cursor disappears and the
changed high limit value display flickers. Press
[SET] again to save the value.

Pressing [SET], the system returns to the items
selection sequence.

and select

keys. Then press [SET] again to display the

[4],

as many times as necessary to move the

[4]

I2: H. ALARM VAL

[4]

the cursor appears. Then press

as many

[5]

and change the value.)

from

and

Note: If you try to set the value above +110% or below –10% of the span, the error messages
*H. OVER SPEC or *L. OVER SPEC, respectively appear. Set the high limit value within the
specified range.

62

8.2.13 Empty Pipe Alarm

The empty pipe alarm is used to notify that the detector pipe is not filled with fluid. If an empty
pipe condition occurs, a message * EMPTY appears. You can enable or disable this function

here.

Proceed as follows to check or change the empty pipe alarm enable/disable status.

 To check the empty pipe alarm enable/disable status:

Key operation Display example Description

J1: EMPTY ALM

ON

SET

JI: EMPTY ALM

SET

 To change the empty pipe alarm enable/disable status:

The following example shows how to disable the empty pipe alarm enable status.

Key operation Display example Description

J1: EMPTY ALM

ON

SET

J1: EMPTY ALM

4

ON

Press [SET] first to start the items selection
sequence and select J1: EMPTY ALM from among

the configuration items using

keys. Then press [SET] again to display the
current empty pipe alarm enable/disable status.

Pressing [SET], the system returns to the items
selection sequence.

Press [SET] first to start the items selection
sequence and select J1: EMPTY ALM from among

the configuration items using

keys. Then press [SET] again to display the
current empty pipe alarm enable/disable status. (In
this example ON will be displayed.)

Pressing

the cursor appears.

[4],

[4]

[4]

and

and

[5]

[5]

5

SET

SET

J1: EMPTY ALM

OFF

J1: EMPTY ALM

OFF

J1: EMPTY ALM

Select “OFF” by pressing

Pressing [SET], the cursor disappears and the
selected status display flickers. Press [SET] again
to save the status.

Pressing [SET], the system returns to the items
selection sequence.

63

[5].

8.2.14 Rate-Of-Change Limit

The rate-of-change limit is used to eliminate high electrical noise contained in the process flow

signal. To check electrical noise, two parameters are defined: rate-of-change limit (set in

percent value of the span) and control limit time (set in units of seconds). Normally the

flowmeter produces the analog output signal by sampling the flow rate signal at 1/24 (or 1/12)

of a second sampling rate. If the sampled value exceeds the set rate-of-change limit value based

on the averaged flow rate value up until the sampled time, the system will reject that sampled

value and instead the averaged value including the rate-of-change limit value in place of the

rejected sampled value will be output. However, if the limit-exceeding sampled value

continues for the same flow direction for more than the preset control limit time, that data will

be used as the output signal. The setting ranges for these two parameters are as follows:

• Rate-of-change limit

0 to 30 %/sampling rate (in increments of 0.5 %)

where the sampling rate is either 1/24, 1/12 or 1/6 of a second depending on the excitation

frequency as shown below:

Excitation frequency Sampling rate

24 Hz 1/24 sec

12 Hz or 6 Hz 1/12 sec

• Control limit time: 0 to 20 sec (in increments of 1 second)

NOTE

If “0” is set in either of these parameters, the rate-of-change limit function is disabled.

Proceed as follows to check or change the rate-of-change limit value and the control limit time.

 To check the rate-of-change limit value and the control limit time:

Key operation Display example Description

K1: LIMIT RATE

05.0 %

SET

Press [SET] first to start the items selection
sequence and select K1: LIMIT RATE from

among the

keys. Then press [SET] again to display the

[5]

configuration items using

[4]

and

current rate-of-change limit time.

K1: LIMIT RATE

SET

Rate-of-change limit value and control limit time can be selected by the configuration items as

Pressing [SET], the system returns to the items
selection sequence.

follows:

Rate-of-change limit value K1: H. LIMIT RATE

Control limit time K1: H. LIMIT TIME

64

 To change the rate-of-change limit value:

The following example shows how to change the rate-of-change limit value from 10.0 % to

15.0 %.

Key operation Display example Description

SET

4

5

SET

SET

K1: LIMIT RATE

10.0 %

K1: LIMIT RATE

10.0 %

K1: LIMIT RATE

15.0 %

K1: LIMIT RATE

15.0 %

K1: LIMIT RATE

Press [SET] first to start the items selection
sequence and select K1: LIMIT RATE from

among the configuration items using

keys. Then press [SET] again to display the

[5]

current rate-of-change limit value (10.0 % in this
example).

Pressing

as many times as necessary to move the

[4]

cursor to the digit to be changed.

Change the value to “5” by pressing

times. (Note)
(If necessary, move the cursor to the next digit to

be changed by pressing

value.).

Pressing [SET], the cursor disappears and changed
rate-of-change limit value display flickers. Press
[SET] again to save the value.

Pressing [SET], the system returns to the items
selection sequence.

the cursor appears. Then press

[4],

and change the

[4],

[4]

[5]

and

five

If you try to set the value outside the valid range, an error message * H. OVER SPEC

Note:

appears. Set the value within the specified range.

To change the control limit time, select the item K2: LIMIT TIME.

65

8.2.15 Fixed-Value Output

The fixed-value output is used to output a fixed current and a fixed pulse output independent of

the flow rate signal. (The fixed pulse output is available only when DO1 is used for PULSE

OUT function.) The fixed-value output can be set in the ranges described below. (Current

output and pulse output can be set and output at the same time.)

•

Fixed current output: 3 to 24 mA (in increments of 0.1 mA)

•

Fixed pulse output: 0 to 1000 pps (in increments of 1 pps)

If you have disabled this function (set to OFF), you do not have to set the subsequent current

and pulse output values.

When this function is enabled (set to ON), the measured data is displayed with the primary

indicating unit only on the first line of the display and the fixed current output is displayed on

the second line of the display. Other data output and display conditions are as follows:

•

Current output: User-set current output

•

Pulse output: Pulse output with a user-set counting rate

•

Digital output(s): Previous status is retained (excluding pulse output).

•

Data Display: Instantaneous flow rates and flow velocity (no totalization)

Display example: 1.000 m/s Å Primary indicating unit

* FIX.OUT 20.0 mA

This fixed-value output function does not work in the calibration mode.

Proceed as follows to check or change the enable/disable status of the fixed-value output and

its output values.

 To check the enable/disable status of the fixed-value output and its output values:

Key operation Display example Description

L1: FIXED OUT

ON

SET

Press [SET] first to start the items selection
sequence and select L1: FIXED OUT from among

the configuration items using

[4]

and

keys. Then press [SET] again to display the fixed­value output enable/disable status.

L1: FIXED OUT

SET

Fixed-value output enable/disable status, fixed current output and fixed pulse output can be

Pressing [SET], the system returns to the items
selection sequence.

selected by the configuration items as follows:

Fixed-value enable/disable status L1: FIXED OUT

Fixed current output L2: FIX. CURR.

Fixed pulse output L3: FIX. PULSE

[5]

66

 To change the enable/disable status of the fixed-value output and its output values:

The following example shows how to enable the fixed-value output function and to set its fixed

current output to 20 mA DC.

Key operation Display example Description

SET

4

5

SET

4

L1: FIXED OUT

OFF

L1: FIXED OUT

OFF

L1: FIXED OUT

ON

L2: FIX. CURR.

10.0 mA

L2: FIX. CURR.

10.0 mA

Press [SET] first to start the items selection
sequence and select L1: FIXED OUT from

among the configuration items using

keys. Then press [SET] again to display the

[5]

current fixed-output enable/disable status (OFF in
this example).

Pressing

Select “ON” by pressing

Pressing [SET], the selected status (ON) flickers.
Press [SET] again to save the status. Then the
system goes to the fixed current value setting
sequence.

Move the cursor to the digit to be changed.

the cursor appears

[4],

[5].

[4]

and

L2: FIX. CURR.

5

L3: FIX. PULSE

SET

L3: FIX. PULSE

SET

L3: FIX. PULSE

SET

Notes:

1. If you try to set the fixed-value output above the allowable range, an error message

*

H. OVER SPEC appears. Try to set the value within the specified range.

2. If PULSE OUT is not selected for digital output, the subsequent pulse output setting

sequence will not be displayed.

20.0 mA

100 PPS

100 PPS

Change the value to “2” by pressing

(If necessary, move the cursor to another digit by

pressing

Pressing [SET], the cursor disappears and the
changed
to save the value. Then the system goes to the
fixed pulse output setting sequence. (Note 2)

Pressing [SET], the cursor disappears and the
fixed pulse output value flickers. Press [SET]
again to save the value.

Pressing [SET], the system returns to the items
selection sequence.

and change the value.) (Note 1)

[4]

value display flickers. Press [SET] again

[5]

twice.

67

 To change the fixed pulse output value:

The following example shows how to change the fixed pulse output value from 50 pps to 100

pps.

Key operation Display example Description

SET

4

5

SET

SET

L3: FIX. PULSE

050 PPS

L3: FIX. PULSE

050 PPS

L3: FIX. PULSE

150 PPS
100 PPS

L3: FIX. PULSE

100 PPS

L3: FIX. PULSE

Press [SET] first to start the items selection
sequence and select L3: FIX. PULSE from among

the configuration items using

keys. Then press [SET] again to display the
current fixed pulse output value (50 pps in this
example).

Pressing

(if necessary, move the cursor by pressing

the digit to be changed.)

Change the value to “1” by pressing

move the cursor to another digit to change and
change the value. In this example repeat this
process until the display shows “100 pps.”

Pressing [SET], the cursor disappears and the
changed value display flickers. Press [SET] again
to save the value.

Pressing [SET], the system returns to the items
selection sequence.

the cursor appears.

[4],

[4]

and

[4]

[5].

[5]

to

Then

Fixed current output value can be changed by selecting the configuration item L2: FIX. CURR.

68

8.2.16 Zero Offset Adjustment

Zero offset can be applied to make the flowmeter outputs comparable to process values

measured by other instruments. If the zero adjustment described in 6.2 requiring a zero flow

rate condition can be performed, this zero offset adjustment is not needed. When the zero

adjustment is completed, zero offset will be automatically cleared to zero. Zero offset can be

set in the range described below:

Zero offset: ±0.125 m/s (±1.25 % of 10 m/s—maximum range) maximum

Proceed as follows to check or change the zero offset value.

 To check the zero offset value:

Key operation Display example Description

M1: MANUAL ZERO

+002.5 %

SET

M1: MANUAL ZERO

SET

Press [SET] first to start the items selection
sequence and select M1:

among the configuration items using

keys. Then press [SET] again to display the

[5]

current zero offset value

Pressing [SET], the system returns to the items
selection sequence.

MANUAL ZERO from

[4]

and

 To change the zero offset value:

Calculate the zero offset value with the following equation:

Zero offset value (%) = {(actual flow rate) – (FMG400 Series measured value)}

The zero offset value should be calculated in percent value for Range 1. See the following

example.

(Example)

Measured condition Flow rate % in measuring span

Actual flow rate obtained
from other instrument.

FMG400 Series measured

value

Zero offset ———— –2.5 %

If zero offset is set to –2.5 %, the converter will output 50.0 % flow rate instead of 52.5%.

10.0 m³/min 50 %

10.5 m³/min 52.5 %

69

The following example shows how to change the zero offset value from +1.0% to –2.5%.

Key operation Display example Description

SET

4

5

SET

SET

M1: MANUAL ZERO

+001.0%

M1: MANUAL ZERO

+001.0%

M1: MANUAL ZERO

-001.0%

-002.0%

-002.5%

M1: MANUAL ZERO

-002.5%

M1: MANUAL ZERO

Press [SET] first to start the items selection
sequence and select M1: MANUAL ZERO from

among the configuration items using

keys. Then press [SET] again to display the

[5]

current zero offset value.

Pressing

(If necessary, press

necessary
change.)

Change the sign code (“+” to “–“) by pressing

Then move the cursor to another digit by

[5].

pressing

example repeat this process until the display
shows “–002.5 %.” (Note)

Pressing [SET], the cursor disappears and the
changed value display flickers. Press [SET] again
to save the value.

Pressing [SET], the system returns to the setting
items selection sequence.

the cursor appears.

[4],

as many times as

[4]

to

move the cursor to the desired digit to

and change the value. In this

[4],

[4]

and

Note:

* H. OVER SPEC or * L. OVER SPEC, respectively, appears. Set the value within ±0.125 m/s.

If you try to set the value above +0.125 m/s or below –0.125 m/s, the error messages

70

9. Calibration

9.1 Calibration Items

You can conduct the following in the calibration mode:

Checks or calibrates the zero and span of the converter by using a simulation signal.

•

Checks of the excitation current.

•

To change the mode to the calibration mode, see 7.3.1, “Mode Change.”

IMPORTANT

To check or change the zero and span of the converter, follow the procedure described
below. However, these are already checked and calibrated when shipped from the
factory. Do not change these settings unless it is necessary to calibrate in the field.

Calibration items are listed below. See each section for detailed procedure.

Section Configuration item Display example Page

9.2.1

9.2.2

9.2.3

0 % flow rate calibration

50 % flow rate calibration

100 % flow rate
calibration

N1:FLOW CAL 0% 0.0 %

N2:FLOW SIG.50% 50.0 %

N3:FLOW CAL100% 100.0 %

71

72

73

9.2.4

Excitation current

N4:EX. CURR.DSP. 0.2100 A

74

71

9.2 Calibration Using Converter Signal Source

9.2.1 0 % Flow Rate Calibration

 To check the zero point of flow measurement:

Key operation Display example Description

N1:FLOW CAL 0%

0.0 %

SET

Press [SET] first to start the items selection
sequence and select N1: FLOW CAL 0% from

among the configuration items using

[5]

calibration mode and calculate and display zero
point using a simulation signal.

N1:FLOW CAL 0%

SET

 To change the zero and span of the converter:

Key operation Display example Description

N1:FLOW CAL 0%

0.1 %

SET

ADJUST READY

0.1 %

4

N1:FLOW CAL 0%

SET

————

SET

* CAL.0% ADJ.

N1:FLOW CAL 0%

0.0 %

N1:FLOW CAL 0%

Pressing [SET], the system returns to the items
selection sequence.

Press [SET] first to start the items selection
sequence and select N1: FLOW CAL 0% from

among the setting items using

keys. Then press [SET] again to go into the
calibration mode and calculate and display zero
point using a simulation signal.

Pressing

shown left and the system goes into a calibration­ready condition.

(Note 1)

Pressing [SET], “* CAL. 0% ADJ.” appears as
shown left and the system starts the zero
calibration. The zero calibration takes about 3 to 6
seconds. (Note 2)

Newly calibrated zero point appears.

Pressing [SET], the system returns to the items
selection sequence.

and

[4]

keys. Then press [SET] again to go into the

and

[4]

“ADJUST READY” appears as

[4],

[5]

Notes:

. The system returns to the point where the zero

1. To cancel zero calibration, press

point display appears.

2. Calibration time depends on the excitation frequency (24 Hz: 3 sec, 12 Hz and

6 Hz: 6 sec).

[5]

72

9.2.2 50 % Flow Rate Calibration

Using the converter’s internal calibration circuit, the system can calibrate the 50% flow rate

point. The 50% flow rate point calibration must be executed after conducting the 100% flow

rate (span) calibration. The 50% flow rate calibration may differ depending on the 100% flow

rate calibration result.

 To check the 50% flow rate point of flow measurement:

Key operation Display example Description

N2:FLOW CAL 50%

50.1 %

SET

N2:FLOW CAL 50%

SET

 To change the 50% flow rate point of the converter:

Key operation Display example Description

N2:FLOW CAL 50%

50.1 %

SET

ADJUST READY

SET

SET

————

SET

N2:FLOW CAL 50%
* CAL. 50% ADJ.

N2:FLOW CAL 50%

N2:FLOW CAL 50%

50.1 %

50.0 %

Press [SET] first to start the items selection
sequence and select N2: FLOW CAL 50% from

among the configuration items using

keys. Then press [SET] again to go into the

[5]

calibration mode and calculate and display 50%
flow rate point using a simulation signal.

Pressing [SET], the system returns to the items
selection sequence.

Press [SET] first to start the items selection
sequence and select N2: FLOW CAL 50% from

among the configuration items using

keys. Then press [SET] again to go into the

[5]

calibration mode and calculate and display 50%
flow rate point using a simulation signal.

Pressing

shown left and the system goes into a calibration­ready condition. (Note 1)

Pressing [SET], “* CAL. 50% ADJ.” appears as
shown left and the system starts the 50%
calibration. The zero calibration takes about 3 to 6
seconds. (Note 2)

Newly calibrated 50% flow rate point appears.

Pressing [SET], the system returns to the items
selection sequence.

“ADJUST READY” appears as

[4],

[4]

[4]

and

and

Notes:

1. To cancel 50% flow rate calibration, press

50% flow rate is displayed.

2. Calibration time depends on the excitation frequency (24 Hz: 3 sec, 12 Hz and

6 Hz: 6 sec).

73

. The system returns to the point where

[5]

9.2.3 100 % Flow Rate (Span) Calibration

Using the converter’s internal calibration circuit, the system can calibrate the 100% flow rate

point (hereafter called span).

 To check the span of the converter:

Key operation Display example Description

N3:FLOW CAL100%

100.1 %

SET

Press [SET] first to start the items selection
sequence and select N3: FLOW CAL 100% from

among the configuration items using

[5]

calibration mode and calculate and display the
span using a simulation signal.

SET

N3:FLOW CAL100%

 To change the span of the converter:

Key operation Display example Description

N3:FLOW CAL100%

100.1 %

SET

Pressing [SET], the system returns to the items
selection sequence.

Press [SET] first to start the items selection
sequence and select N3: FLOW CAL100% from

among the configuration items using

[5]

calibration mode and calculate and display 100%
flow rate point using a simulation signal.

4

SET

————

SET

ADJUST READY

100.1 %

N3:FLOW CAL100%
* CAL. 100% ADJ.

N3:FLOW CAL100%

100.0 %

N3:FLOW CAL100%

Pressing

shown left and the system goes into a calibration­ready condition. (Note 1)

Pressing [SET], “* CAL. 100% ADJ.” appears as
shown left and the system starts the 100%
calibration. The zero calibration takes about 3 to 6
seconds. (Note 2)

Newly calibrated 100% flow rate point appears.

Pressing [SET], the system returns to the items
selection sequence.

and

[4]

keys. Then press [SET] again to go into the

and

[4]

keys. Then press [SET] again to go into the

“ADJUST READY” appears as

[4],

Notes:

1. To cancel the span calibration, press

flow rate is displayed.

2. Calibration time depends on the excitation frequency (24 Hz: 3 sec, 12 Hz and

6 Hz: 6 sec).

The system returns to the point where 100%

[5].

74

9.2.4 Checking the Excitation Current Value

You can monitor the exciting current value. The excitation current value is factory adjusted

when shipped. Contact OMEGA if any change is necessary.

 To check the exciting current value:

Key operation Display example Description

SET

SET

N4:EX. CURR.DSP.

0.2100 mA

N4:EX. CURR.DSP.

Press [SET] first to start the items selection
sequence and select N4: EX. CURR. DSP. from

among the configuration items using

keys. Then press [SET] again to display the

[5]

excitation current value.

Pressing [SET], the system returns to the items
selection sequence.

[4]

and

75

10. Digital I/O Functions

The converter has two digital output (DO1 and DO2) terminals along with one digital input

(DI) terminal. These terminals can be used in various ways, such as a pulse output, or an alarm

output terminal.

Digital I/O functions described below can be assigned for DO1, DO2 and DI.

Functions Description

Totalization  The converter totalizes volumetric flow values.

Multiple Ranges

Forward and Reverse
flow measurements

High and Low Limit
Alarms

Empty Pipe Alarm

Totalizer Preset Point

Remote Zero
Adjustment

 The totalized

scaled by a user-specified factor (counting rate).

flow can be output as a pulse signal (DO1 only)

 The totalizer and pulse signal (DO1 only) can be controlled

(starts, stops and resets) by an external signal (DI).

 Multiple measuring ranges can be switched according to the

process flow rates either automatically or by an external
signal (DI).

 Forward and reverse flows can be measured. The forward

and reverse flow measurements can be used together with
multiple range switching function.

 Outputs an alarm signal (DO1 or DO2) when the process

signal exceeds or stays below the limit values.

 The detector pipe must be filled with fluid all the time.

When it is not filled with fluid, the converter outputs an
alarm signal (DO1 or DO2).

 When the totalized flow reaches its preset count value, the

converter outputs a contact output signal (DO1 or DO2).

 Zero adjustment (on-stream at zero flow rate) can be started

by an external signal (DI).

Fixed-value Output

Converter Failure
Alarm

Fixed current output and fixed pulse output can be used to
check a process loop circuit. An external signal (DI) can also
be used to control this fixed-value output.

 The converter outputs an alarm signal (DO1 or DO2) if an

error such as memory error or excitation circuit error occurs.

76

10.1 Digital I/O Specifications

Digital I/O specifications for the converter are described below:

 Digital Output 1(DO1)

Output type: Transistor open collector

Number of outputs: One point

Capacity: 30 V dc, 200 mA maximum

 Digital Output 2(DO2)

Output type: Solid-state relay (no polarity)

Number of outputs: One point

Capacity: 50 V dc, 150 mA maximum;

 Digital Input (DI)

Input signal: 20 to 30 V dc voltage signal

High input level—20 to 30 V dc

•

Low input level—2 V dc maximum

•

Input resistance: Approximately 2.7 kΩ

Number of inputs: One point

Each I/O terminal can be used as a specified function terminal when selected.

•

Terminal COM is the signal COMMON for the other three terminals (DO1, DO2 and DI).

•

Each terminal is isolated from the internal circuits. (The output terminals are not isolated

•

from each other.)

In the case of the standard specification (specification without digital input/output), no

•

semiconductor contact, photocoupler or resistor is incorporated. Leave DO2 and DI open.

77

10.2 Totalizer and Pulse Output

To use the totalizer and pulse output for external use, proceed as follows.

Counting

Rate and Pulse Width Settings



Set the counting rate (flow volume per count) and the pulse width. Refer

to 8.2.10, “Counting Rate.” Set the pulse width in accordance with

response time of receiving instruments. If the pulse output is not used,

pulse width setting is not needed.

DO function setting

 Set DO1 as a pulse output contact signal. Refer to 8.2.9, “Digital I/O

Functions.” This is not needed if the pulse output is not used.

DI function setting (Note 1)

 Set one of the DI functions. Refer to 8.2.9, “Digital I/O Functions.”

Indicating Unit Setting

 Select an indicating unit for UNIT 1 and/or UNIT 2 among units for

totalization (m³, l ,ml or COUNT). (Note 1)

Measurement Mode

 Set the operation mode of the system to the measurement mode.

Refer to 7.3.1, “Mode Change.”

Clear (reset) the totalizer.

 Clear (reset) the totalizer by pressing

[4]

key.

If you have changed the counting rate, clear (reset) the totalizer

before you start the totalizer.

Start the totalizer.

Start the totalizer by pressing

key and make sure “C” is shown on the

[5]

display. (Note 2)

Notes:

1. It is preferable to set the indicating unit (UNIT 1 and/or UNIT 2) to one of the units

appropriate for totalization just to make sure it is operating correctly.

2. If the indicating unit (UNIT 1 and/or UNIT 2) is not the one for totalization, “C” does

not appear on the display.

78

Totalizer Operation

 Using control keys on the panel

To start, stop or clear (reset) the totalizer, follow the procedure described below:

Key operation Display example Description

5

5

4

F 1 C

1.2300 m/s

F 123

1.23000 m/s

F 0

1.23000 m/s

Starts the totalizer (and pulse output).
“C” for counting will be displayed and either “F”
for forward or “R” for reverse flow direction will
also be displayed.

Stops the totalizer (and pulse output).
C” shown on the display disappears.

Clears (resets) the totalizer (and pulse output)

NOTES

1. When a bi-directional (forward and reverse) multi-range is selected, the display shows

either forward or reverse flow counts depending on the selected flow direction range.

When

When a unidirectional flow (forward or reverse) is selected, the totalizer does not count

the opposite direction flow counts.

2. Non-volatile memory is used to store the totalizer counter value. Therefore, the value will

is pressed, the flow counts for both directions will be cleared to zero.

[4]

be retained in the memory even if the power is cut off.

 Using the DI signal

Remote operations for the totalizer and pulse output can be conducted using the DI signal. The

following functions in the table can be performed. See 8.2.9, “Digital I/O” to select these

functions.

Digital input (DI)
Functions

Start/Stop

Reset/Start

DI voltage
level

L Stops the totalizer and the pulse output.Totalizer

H Starts the totalizer and the pulse output.

H Stops and clears (resets) the totalizer.Totalizer

L Starts the totalizer and the pulse output.

Totalizer and pulse output

79

10.3 Multi-range Functions

Multi-range functions can be set under the configuration item “RANGE TYPE.” Refer to 8.2.5,

“Span (Range).” Four types of multi-range configurations are available as shown below:

(1) Automatic selection of unidirectional flow multi-range

(2) Automatic selection of bi-directional flows multi-range

(3) Remote selection of unidirectional flow multi-range with an external signal

(4) Remote selection of bi-directional flows multi-range with an external signal

Proceed as follows to use the multi-range functions.

Range setting



Set as follows referring to 8.2.5, “Span (Range),”

1. Select “RANGE TYPE.”

2. Set the span for ranges 1 to 4.

3. Set the hysteresis value.

DO/DI function setting

 Set DO1 and/or DO2 to use them as range outputs.

Refer to 8.2.9, “Digital I/O Functions.”

 To select ranges with a remote signal, use DI as a remote signal.

Refer to 8.2.9, “Digital I/O Functions.”

80

 Output performance of multi-range functions

(1) Automatic selection of unidirectional flow multi-range

Range output Output status

No. 1 ON OFF ON OFF

No. 2 ON ON OFF OFF

Note: The current output for opposite direction flow is 4 mA.

81

(2) Automatic selection of bi-directional flows multi-range

Range output Output status

No. 1 OFF ON ON OFF

No. 2 ON OFF

 Reverse to Forward direction change

Forward to Reverse direction change

82

(3) Remote selection of unidirectional flows multi-range with an external signal

External signal H level input L level input

Range output No. 1 ON OFF

Note: The current output for opposite direction flow is 4 mA.

83

(4) Remote selection of bi-directional flows multi-range with an external signal

External signal L level H level H level L level

Range output No. 1 OFF ON ON OFF

Range output No. 2 ON OFF

 Reverse to Forward direction change Forward to Reverse direction change

84

10.4 High and Low Limit Alarms

Proceed as follows to use the high and low limit alarms:

High and Low limit value setting



Set the high and/or low limit alarm enable/disable status to ON and

set the limit value for high and/or low alarm. See 8.2.12, “High and Low

Limit Alarms.” To disable the high or low limit alarm, set its

enable/disable status to OFF.

DO function setting



Set DO1 and/or DO2 as high and/or low limit alarm outputs.

See 8.2.9, “Digital I/O Functions.”

85

 High and Low Limit Alarm Output Performance

(1) Single range performance

(2) Multi-range performance

In an example shown below, a low limit alarm is set for the Range 2 and a high limit

alarm is set for the Range 1.

Note: Alarm output is an ON signal (contact closed) when an alarm occurs.

86

10.5 Empty Pipe Alarm

Proceed as follows to use the empty pipe alarm output.

Alarm output setting



Set the empty alarm enable/disable status to ON. See 8.2.13, “Empty Pipe

Alarm.”

DO function setting



Set DO1 or DO2 as the empty pipe alarm output. See 8.2.9, “Digital I/O

Functions.” If you use the empty pipe alarm function but not an external

output, this setting is not needed.

 Output conditions when an empty pipe alarm occurs:

4–20 mA output: 4 mA

•

Totalizer and pulse output: Totalizer and pulse output are stopped.

•

Measured data display: Zero is indicated for instantaneous flow rate.

•

Alarm output: ON (for DO1 and contact closed for DO2)

•

See Chapter 11, “Self-Diagnostics and Alarms.” to use the empty pipe alarm

function.

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10.6 Preset Point Output

Using this preset point output function, you can output a contact signal when the totalized flow

reaches its preset value. Proceed as follows to use this function.

Totalizer setting



Set necessary parameters and selections to use the totalizer.

See 10.2, “Totalizer and Pulse Output.”

Preset value setting



Set the desired preset value. See 8.2.11, “Preset Count Value.”

DO/DI function setting



Set DO1 or DO2 for use as a preset point output.

See 8.2.9, “Digital I/O Functions.”



To clear (reset) the totalizer with an external signal, set DI as a Reset/Start

signal. If you use the control keys on the panel to clear (reset) the

totalizer, this setting is not needed.

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 Preset point output performance

The following is an example in which the totalizer is reset with an external signal.

Input/Output signal time chart

When the Reset/Start signal is in H level, the totalizer is reset to zero and stops counting.

•

When the Reset/Start signal goes to L level, the totalizer starts counting.

•

The preset point output goes ON when the totalizer counts reaches the preset point and the

•

output goes OFF when the totalizer is reset to zero.

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10.7 Remote Zero Adjustment

On-stream zero adjustment in a zero flow rate condition can be started with an external signal.

To do this, set DI as a zero adjustment start signal. See 8.2.9, “Digital I/O Functions.”

 Start signal requirements:

The start signal must be set to H level first, then it must go to L level after the passage of more

than 10 seconds but not more than 20 seconds, as shown above. (If the signal does not go to L

level within this specified period, it will be ignored.) As soon as the signal goes to L level, zero

adjustment sequence starts.

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10.8 Remote Selection of Fixed Value Output

A user-specified current output and pulse output can be selected with a DI signal.

Proceed as follows to use this function:

Fixed-value setting



Set the fixed-value for current output and for pulse output. See 8.2.15,

“Fixed-Value Output.” Set the fixed-value output enable/disable status to

“OFF.”

If the pulse output is not used, fixed-value setting for pulse output is not

needed.

DI function setting



Set DI to use as a fixed-value output control signal. See 8.2.9, “Digital I/O

Functions.”

Control signal input conditions:

Control signal input level

L level

H level

4 –20 mA and pulse output

Outputs the measured value.

Outputs the fixed-value.

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10.9 Converter Failure Alarm

When one or more of the following converter errors occur in a self-diagnostics sequence, an

alarm signal can be output. To use this function, set DO1 or DO2 to use as an alarm output

signal. See Chapter 11, “Self-Diagnostics and Alarms” for details of each alarm status.

 Self-diagnostics errors

Self-diagnostics error

Error contents

(LCD display)

*ROM ERROR*

*RAM ERROR*

PARAMETER FAIL

EX. CURR. OPEN

EX. CURR ERROR

ADC. ERROR

INVALID TOTAL

ROM error

RAM error

System parameter error

Excitation circuit open

Excitation current error

ADC error

Invalid totalizer counts

 Output conditions

Turns ON (contact closed) when an error occurs.

•

Turns OFF (contact open) when power is cut off.

•

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11. Self-Diagnostics and Alarms

Self-diagnostic items and their error or alarm messages are described below.

11.1 Self-diagnostics

The converter has a self-diagnostics function to detect such problems as setting error, I/O error

or converter hardware failure and shows the resulting error or alarm messages on the LCD

display. The error or alarm messages and their corrective actions are described below.

 Setting error

If you try to set the value or measuring unit out of the range specified for each item, one of

the following error messages appears.

Error message Description Corrective action

* H. OVER SPEC.

* L. OVER SPEC.

* H. OVER C RATE

* L. OVER C RATE

* MULTI RNG ERR

 High and low limit alarms

If the flow rate reading goes out of the set range, one of the following messages appears. If

the high or low limit alarm enable/disable status is set to OFF, its alarm function (high or

low) is disabled. See 8.2.12, “High and Low Limit Alarms.”

Alarm message Description Corrective action

H. ALARM

L. ALARM

Setting value exceeds the
allowable high limit.
Setting value goes below the
allowable low limit.
Counting rate exceeds the
allowable high limit.
Counting rate goes below the
allowable low limit.
Span is not appropriate for
multi-range configuration.

Flow rate reading exceeds the
high limit.

Flow rate reading goes below
the low limit.

Try to set the value
within the specified
range.

Try to set the span as
specified.

Arrange so that the
reading stays below
the high limit.
Arrange so that the
reading stays above
the low limit.

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 Empty pipe alarm

If the detector pipe is not filled with fluid, the following message appears.

Design piping so that the detector pipe is always filled with the fluid to be measured. If the

empty alarm enable/disable status is set to OFF, this function is disabled. See 8.2.13,

“Empty Pipe Alarms.”

Alarm message Description Corrective action

EMPTY

Detector pipe is not filled
with fluid.

Arrange piping so that
the detector pipe is
always filled with fluid.

Precautionary notes on using the empty pipe alarm

(1) The flowmeter detects an empty pipe condition by monitoring the impedance and signal

level between the flow signal lines connected to a pair of electrodes. Therefore, the

following factors may trigger an erroneous empty pipe alarm:

Opening or loose connection of flow signal lines

•

The fluid to be measured is carrying a lot of bubbles

•

Contamination of the electrode with non-conductive deposits

•

(2) If the flowmeter is not grounded properly or if it is in an environment where high

electrical noise exists, the empty pipe alarm may not function properly. Under these

conditions, the reliability of flowmeter accuracy itself is not high. Try to ground the

flowmeter securely to an independent good ground and relocate the cable runs to prevent

noise from entering into the flowmeter circuit.

(3) If the fluid still remains in the detector pipe or the internal wall of the detector pipe is

contaminated with electrically conductive deposits, the impedance between the signal

lines will not go high and the empty pipe alarm may not work. In this kind of event, try to

use other means to detect an empty pipe condition (such as a pump stop signal or a signal

from a valve).

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 Converter hardware failure

The system checks the internal circuitry at the time of power-up for all error items and

checks continuously for the specified items as described below. If an error is detected, one

of the messages shown in the table below will be displayed.

If multiple errors occur, their messages will be displayed cyclically. The diagnostics items

concerning the excitation cable and excitation circuit are detected using the ADC circuit.

Thus, if the ADC fails, No. 4 (excitation cable) and No. 5 (excitation circuit) errors cannot

be detected correctly. Further, this entire checking system is based on the CPU in the

flowmeter. Therefore, if the CPU fails, no accurate diagnostics or error message display

can be obtained.

No. Error message Description Corrective action

* ROM ERROR *

1

* RAM ERROR *

2

PARAMETER FAIL

3

EX. CURR. OPEN

4

EX. CURR. ERROR

5

ADC. ERROR

6

INVALID TOTAL

7

ROM error

RAM error

System parameter error
Excitation cables are not
connected.
An error occurred in the
excitation circuit.

ADC error

Totalizer data was
destroyed due to external
noise. (No message
appears if totalization is
not used.)

Internal components or
printed-circuit board must
be repaired or replaced.
Contact OMEGA.

Connect the excitation
cables correctly.
Internal components or
printed-circuit board must
be repaired or replaced.
Contact OMEGA.
The error message
disappears if you press
the reset key.

NOTES

1. Errors No. 1 to No. 3 can be detected only at the time of power-up. The flowmeter does

not start measurement if any one of these errors is detected. If these errors occur after
power-up, the flowmeter cannot detect these errors, and thus may indicate and output
incorrect data.

2. Errors No. 4 to No. 6 may not be detected even if the errors result in incorrect

flowmeter accuracy, because of characteristic differences in components used to detect
these errors.

3. CPU error cannot be detected. If the CPU stops, the watchdog timer resets the internal

circuits and the flowmeter starts again from the initial power-up condition. Depending
on CPU condition, the flowmeter may not indicate and output correct data.

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11.2 Output Status for Errors and Alarms

The flowmeter data display, current and pulse outputs will become as follows if an error or

alarm occurs.

Error or alarm
message

ROM ERROR

RAM ERROR

PARAMETER FAIL

EX. CURR OPEN

EX. CURR ERROR

ADC. ERROR

INVALID TOTAL

EMPTY

(Note 1)

Data
display

Current
output
(4–20 mA)

——— 4 mA Stopped

Totalizer
and
pulse output

Remarks

After power-up, no
measurement
starts.

——— 4 mA Stopped

Zero 4 mA

Stopped ————

(Note 2)

Zero 4 mA Stopped

Zero adjustment
(on-stream at zero
flow rate) cannot be

conducted.
Measured
data

Measured
data

Measured
data

————

Zero 4 mA Stopped ————

Measured
data

Measured
data

Measured
data

The error message

disappears if you

clear (reset) the

totalizer.

Zero 4 mA Stopped

Zero adjustment

(on-stream at zero

flow rate) cannot be

conducted.

Notes

1. The display and output may not be as indicated depending on the nature of the ROM

error.

2. If parameters related to the current output are defective, the current output may not be

exactly 4 mA.

96

12. Maintenance and Troubleshooting

CAUTION

 Do not conduct wiring work when

power is applied.

Wiring while power is
applied can cause electric

DON’T

shock.

Do not touch the FMG400 Series main

body when high temperature fluid is
being measured.

The fluid raises the main
body temperature and can

DON’T

cause burns.

12.1 Maintenance

 Calibration

The converter has a reference signal generating circuit. This reference signal can be
used to check the zero and span of the converter for the purpose of instrumentation
maintenance or periodical inspection. See Chapter 9, “Calibration.”

 Fuse

The fuse can be taken out by unscrewing the cap of the fuse holder. Check that the fuse is

not damaged. The fuse has to be replaced periodically. The recommended replacement

period is 3 years.

Type of fuse used: Glass tube fuse 1 piece

Rating: Power supply rating AC 100 to 240 V

1 AM/250 V

Dimensions: Diameter 5.2 mm × 20 mm

 LCD display

If the characters displayed on the LCD are dimmed or blurred, the LCD display should be

replaced. To extend the life of the flowmeter, replace the LCD early. To check and replace

the LCD display, contact OMEGA.



Power supply unit

Electronic components deteriorate faster when the ambient temperature is high. The life of

the power supply unit in the converter is 9 to 10 years if the ambient temperature is 40° C,

and 5 to 6 years if it is 50° C. To extend the life of the flowmeter, we recommend you

replace the power supply unit early. Contact OMEGA for a flowmeter inspection or unit

replacement.

97

IMPORTANT

(1) It is recommended that the detector pipe be cleaned once a year.
(2) Use always new packing when mounting the flowmeter detector in the pipeline.

 Cleaning the inside of the detector

If the fluid to be measured contains a high concentration of electrically conductive solids,

the solids may accumulate as deposits on the internal wall of the detector pipe. The deposits

cause a reduction of flowmeter measuring output. If the measuring output is lower than the

actual process value, check for deposits on the internal wall of the detector pipe. If found,

remove the deposits using a soft brush. Clean the inside of the detector periodically if

measuring this kind of fluid.

 Operative life

The operative life of this flowmeter is 10 years from the date of shipment. The life of the

flowmeter differs depending on the environmental conditions and the way it was used. To

extend the life of the flowmeter, inspect the flowmeter periodically and clean or replace

components if necessary.

98

12.2 Troubleshooting

If a problem occurs while using the FMG400 Series, follow the flowcharts described below.

You may find a way to solve the problem. The flowcharts are based on three symptoms (1) to

(3). If you cannot solve the problem, contact OMEGA.

(1) Flow rate is not indicated.

Are power and I/O
cables installed
correctly?

YES

Are power and I/O
cables installed
correctly?

YES

Is the fuse not burnt?

NO

Is the flow range
correctly set?

NO

NO

YES

NO

Use the correct power supply
for each device.

Install the cables correctly.
Refer to Chapter 5, “Wiring.”

Replace the fuse with a new
one.

Set correctly. Refer to
Chapter 8, “Configuration
Parameter Setting.”

YES

Is the arrow direction
on the detector in
accordance with the
actual flow?

YES

Contact OMEGA

NO

99

Install the detector correctly.

to

Refer

4.2, “Mounting

Procedure.”