EMF-300E Series Electromagnetic Flowmeter
User Manual
Contents
1
Introduction・・・・・・・・・・・・・・・・・・・・1
2
Features ・・・・・・・・・・・・・・・・・・・・・ 1
3
Specifications・・・・・・・・・・・・・・・・・・・ 2
4
Operation Principle・・・・・・・・・・・・・・・・・ 4
5
Installation of Sensor ・・・・・・・・・・・・・・・・ 5
6
Installation and Connecting of Readout ・・・・・・・・ 7
7
Display ・・・・・・・・・・・・・・・・・・・・・・9
8
Settings ・・・・・・・・・・・・・・・・・・・・・10
9
Maintenance ・・・・・・・・・・・・・・・・・・・14
10
Outline Drawings ・・・・・・・・・・・・・・・・・17
Introduction
This Flowmeter displays the flow rate of water on a pumping appliance (the fire
appliances).
Displaying the flow rate of water provides easy handling of the pump operation and
enhances safety at the branches when discharging water.
Features
- Connector joint makes easy to perform the connecting operation.
- The thin casing of the Readout enables the unit to be attachable on either the front or back side
of the panel.
- With a backlit LCD display, no outside lighting is required in a dark room or even at night. The
display has high contrast for easy reading even in direct sunlight.
- The Readout employs a 4-digits display and a bar graph display.
- In the bar graph display, the optimum flow rate of water with “one branch operator” is marked in
a green frame and the optimum flow rate of water with “two branch operators” is marked in a red
frame.
- Contamination at the electrode is detected by pressing buttons on the readout.
- The diameter of the flow channel of the Sensor substantially matches the diameter of the pipe so
there is no pressure loss.
- There is no projection or mechanical moving parts in the flow channel of the Sensor.
Therefore, no foreign materials such as dirt and trash are trapped or no damages or breakdowns
occur at the Sensor.
- The power supply voltage is DC +24V which is applicable to gain power by a car battery.
(Contact us if you wish to employ the power supply voltage of DC+12V.)
- This Flowmeter (EMF-300E) can be used with our Flowmeter Integrator (EMS-624E).
The Flowmeter Integrator can be connected up to 6 units of this Flowmeter so that the total
volume of water discharged per pumping appliance is calculated.
Panel
Panel
Readout
Readout
Sensor
Pipe
Sensor
Water Port Joint
Ball Cock
Connector Cover of Sensor Mounted Above Sensor
Pipe
Water Port Joint
Ball Cock
Connector Cover of Sensor Mounted Below Sensor
FIG. 2-1 Installation of Flowmeter
Specifications
For Bar Graph = 1500L / min.
Model
Sensor Material
Type
Type
Detection Range
R
E
A
D
O
U
T
Digital Readout of Flow Rate
4-digit LCD display (10L / min.)
Bar Graph
Display / Scale
Bar Graph Color
Frame
Green Frame (A: One Branch Operator)
Red Frame (B: Two Branch Operators)
Red Frame
Red Frame
Red Line
Lighting
Surface Emitting LED
Dimensions
S
E
N
S
O
R
Weight
Approx. 0.5 kg
Structure
Drop-proof (Rainproof) Structure
Diameter of Pipe
For 65A (SGO Copper : Inner Diameter 67.9 mm)
Pressure Rating
Normal
Instant
Fire Department Standard Flange 140 mm
Flange
Hole Position
8 Divided Points on the
4 Divided Points on the
Circumference, with Diameter of Circumference, with Diameter of
110 mm
110 mm
Dimensions
Weight
Material
Approx. 3.0 kg
Approx. 6.0 kg
Casing
Pipe
40% GF Plastic
Electrodes
Structure
G
E
N
E
R
A
L
Drop-proof (Rainproof) Structure
Resolution *
Supply Voltage
(Negative Ground)
Supply Current
* The volume of laminar flow of water passing through a straight pipe having the length of 1 m at the
input port and the length of 0.5 m at the output port of the Sensor.
For Bar Graph = 1000L/min
Model
BC6 Type
ADC6 Type
Sensor Material
Detection Range
R
E
A
D
O
U
T
S
E
N
S
O
R
Digital Readout of Flow Rate
4-digit LCD Display (10L/min)
Bar Graph Display
50L/min (per one scale)
Bar Graph
Color Frame
Green Frame
Lighting
Surface Emitting LED
Dimensions
Weight
Approx. 0.5 kg
Structure
Drop-proof (Rainproof) Structure
Diameter of Pipe
For 65A (SGP Copper: Inner Diameter 67.9 mm)
Pressure Rating
Red Frame
Normal
Instant
Fire Department Standard Flange 140 mm
Flange
Hole Position
8 Divided Points on the
Circumference, with Diameter
of 110 mm
4 Divided Points on the
Circumference, with Diameter of
110 mm
Approx. 3.0 kg
Approx. 6.0 kg
Dimensions
Weight
Material
Casing
Pipe
40% GF Plastic
Electrodes
Structure
G
E
N
E
R
A
L
Drop-proof (Rainproof) Structure
Resolution *
Supply Voltage
(Negative Ground)
Supply Current
* The volume of laminar flow of water passing through a straight pipe having the length of 1 m at the
input port and the length of 0.5 m at the output port of the Sensor.
Operation Principle
This Electromagnetic Flowmeter consists of a pipe (or a flow channel) through which water flows, an
excitation coil to apply a magnetic field to water flow, and a pair of electrodes mounted on the side face
of the flow channel.
Where the magnetic flux of the magnetic field is represented as “B[T]”, the velocity of water is
represented as “V[m/s]”, and the diameter of the pipe is represented as “D[m]”, the amount of voltage E is
obtained based on the calculation result of the following equation:
Magnetic Field
E =BvD [V]
Excitation Coil
When the magnetic flux B and the pipe diameter D
Water
remain constant, the amount of voltage E is
proportional to the velocity of water V. Therefore, the
velocity of water V can be obtained by measuring the
amount of voltage E.
Since the amount of voltage is weak, the velocity of
water may need to be amplified to display the velocity
of water in digital.
Pipe
Electrode
As illustrated in the block diagram below, this
(Flow Channel)
Flowmeter employs an oscillator to generate the AC
magnetic field in order to amplify the AC current of the
FIG.4-1 Structure of Sensor
amount of voltage generated by the oscillator.
Accordingly, this Flowmeter is prevented from
negative impact such as polarization voltage that may
be generated between the electrodes and the change
of the amplifier with time.
Power Supply
for Sensor
Resistance
Excitation
Coil 1
Electrode
Excitation
Coil 2
Coupled
Circuit
RS485
Transceiver
RS485
Transceiver
Dual Channel Forward / Reverse Driver
RS485
Transceiver
Sensor
Readout
FIG. 4-2. Block Diagram
5 Installation of Sensor
5.1 Installation of Sensor of Flowmeter
5.1.1 Position of Installation
Mount the Sensor behind the ball cock as illustrated in FIG. 2-1.
If the Sensor is mounted in the middle of the pipe, it would be difficult to perform maintenance and
cleaning. Further, if there is not sufficient space for laying the straight pipe in front of and behind
the Sensor, an incorrect value may be displayed on the Readout and the flow rate of water may
need to be corrected.
5.1.2 Procedure of Mounting the Sensor
Make sure that the Sensor is mounted in the correct direction so that water flows in a direction
indicated by arrow illustrated on the connector cover.
Mount the Sensor such that the connector cover is immediately above or immediately below the
Sensor. (See FIG. 5-1(b).)
(a) Arrow indicating
the direction of flow
(b) Mounting the Sensor
Mount the Sensor in either
direction illustrated here.
Connector under Sensor
Flow
Flow
Connector above Sensor
Connection
Flange
FIG. 5-1. Mounting Direction
5.1.3 Mounting Flange
The diameters of the inlet port and the outlet port in the flow path of the Sensor is 70 mm and the
outer circumference is 140 mm. The positions of mounting screw holes, there are 4 divided points
for 24-B type having the diameter of 110 mm and 8 divided points for 24-C type having the diameter
of 110 mm. The volt to be used is M10 and P = 1.5. Prepare flanges and gaskets fitting to the above
sizes. The effective depth of the screw portion is 15 mm. Prepare mounting volts having an
appropriate length.
5.1.4 Others
WARNING
Never apply rust-proofing painting on the interior of the Sensor.
6 Installation and Connecting of Readout
6.1.1 Location of Mounting
Mount the Readout from the back side or the front side of a panel near the Sensor.
The Readout employs an LCD display with inner lighting. No nighttime lighting required.
WARNING
Though the surface of the Readout is covered and protected by a polycarbonate film,
do not give a strong shock. Do not use volatile solvents such as thinner.
6.1.2 Installation
An example is given of panel work for mounting the Readout with reference to FIG. 5-3.
Prepare M4 mounting screws appropriate according to the thickness of the panel and the external
view and fix with the nuts from the back side. The recommended tightening torque per screw is
100N・m.
From Front Side
From Back Side
Panel Work for Mounting the Readout
M4 Screw
M4 Nut
M4 Screw
Hole
FIG. 5-2. Example of Panel Work
FIG. 5-3. Mounting Direction
M4 Nut
6.1.3 Connecting
Check that the switch for the flow rate measurement of the pumping appliance such as a fire engine
is OFF and connect and joint the connectors according to FIG. 5-4.
Connecting Plan (Ex. For Connecting 4 Flowmeters)
Sensor
Sensor
Sensor
Flow Rate
Flow Rate
Sensor
Flow Rate
Flow Rate
PS Cable
X4 (Accessories)
Readout
PWR
Readout
Flow Rate
PWR
Integrate
Readout
Flow Rate
Integrate
PWR
Flow Rate
Integrate
Readout
PWR
Flow Rate
Integrate
WS Cable
X4 (Accessories)
Connection Terminal
X4 (Prepared by User)
Extention Terminal
X4 (Prepared by User)
Switch for Flowmeter of
Pumping Vehicle
(Prepared by User)
Accessories
- WS Cable (2m)
- PS Cable between Readout and Sensor (2m)
DC24V (Pumping Vehicle Battery)
Options
- PS Cable between Flowmeter and Integrator
FIG. 5-4 Connection Diagram
The WS cable (a power supply cable) has lead lines on one side as illustrated in
FIG. 5-5.
Connect the lead lines to external switches.
Sheath Color: Orange
Lead Line: Brown (+24V Anode)
Lead Line: Blue (0V Grounded)
FIG. 5-5. Cable (Power Supply Cable)
Handling of Connection Lines
(1) Clamp the cables.
(2) Turn the screw of the connector to fix it completely. Incomplete fixing of the screw may cause
deterioration in water-proof function and connection failure.
Note that this device is designed under the condition that the negative side (cathode) of the power
supply battery is connected to the vehicle body. If not, connect the casing of the Sensor to the
negative side (cathode side) of the power supply electrically.
7 Display
7.1 Flow Rate Display Mode
This mode is to display the flow rate of water on the Readout for a fire pumping appliance.
When the power is supplied to the Flowmeter, the statuses are displayed in the following order
before the value of the flow rate is displayed.
1. Display Check
2. Sensor Software Version Display 3. Readout Software Version Display
4. Product Type Number Display
5. Flowmeter Setting Number Display
6. Flow Rate Display
Display Check
Whether the flow rate is properly or not is displayed in digital.
When functioning properly, “8888” is displayed.
Product Type
Number Display
The product type number of the Flowmeter is displayed.
This number is managed by KGK for use at maintenance.
Flowmeter Setting
Number Display
The number set and dedicated to the Flowmeter is displayed.
(Ex.) When two flowmeters are mounted to one pump appliance, “ID_1” is
displayed for one of the flowmeters and “ID_2” is displayed for the other.
Flow Rate Display
The current value of the flow rate of water is displayed.
Two marks A and B indicate “Dirty Electrode” or “No Water” in the pipe of the
Sensor and blink simultaneously. For details, refer to “8.2 Electrode Test.”
The flow rate of water is displayed in a 4-digit number
and a bar graph. One scale of the bar graph indicates
50L/min. The bar graph indicates up to 1000L/min.
The optimum volume of water to be discharged for one
branch operator, 550L/min, is displayed in a green frame
and the optimum volume of water to be discharged for
two branch operators, 650L/min, is displayed in a green
frame.
For One Branch Operator
For Two Branch Operators
Bar Graph Indicator
4-digit Digital Indicator
Unit
8 Settings
This Flowmeter performs correction of the flow rate and setting of the address number with S, P,
and M buttons on the Readout.
The address number is required to set only when installing and operating multiple flowmeters and
the EMS-624E type Flowmeter Integrator to one fire engine. (Refer to 8.2 Address Number Setting.)
8.1 Correction of Flow Rate
This Flowmeter is already calibrated at shipping and there is no need for readjustment after
installation.
However, if the length of a straight pipe is not sufficient in front of and behind the Sensor, an
erroneous value may be displayed on the Readout.
Even though the electrode test determined that the value is normal, if the volume of water
discharged and the flow rate displayed on the Flowmeter are different, correct the flow rate following
the steps below.
(1) Supply the power.
- After the initial display, the view of the Readout changes to the Flow Rate Display Mode.
(2) Handle the ball cock and use a tool such as a pitot gauge to correctly measure the volume of water
discharged.
* The following description is made assuming that the measured value is 800L/min, the displayed value
of the Flowmeter is 760L/min.
(3) Under measurement of the volume of discharging water, press the S button and the P button of the
Readout simultaneously for 20 seconds or more.
- The display of the Readout is switched to the Flow Rate Correction Mode.
Flow Rate Correction Mode
Flow Rate Display Mode
Press the S button and
the P button
simultaneously for 20
seconds.
Release your finger
from the button when
the display is switched
to the Flow Rate
Correction Mode.
The value of the current flow
rate is displayed.
The mode is switch to
the Flow Rate Correction Mode.
(4) Press the S button or the M button of the Sensor to set the same value on the Readout indicator as
the measured value.
Press the P button once to increment the value of the flow rate by 1. Press the M button once to
decrement the value of the flow rate by 1. If you press the button continuously, the speed of indication
of the value of the flow rate (the increment or decrement of the value) faster.
Flow Rate Correction Mode
Press the button continuously
to increment or decrement the
value of the flow rate faster.
P button
Press to increment the value of
the flow rate.
M button
Press to decrement the value of
the flow rate.
(5) When the setting is completed, press the S button.
- The temporary value of the flow rate is set and the Flow Rate Correction Check Mode is displayed.
Flow Rate Correction Check Mode Display
Ex.: The flow rate is set to 800L/m.
The temporary value of the flow rate is
set and the Flow Rate Correction Check
Mode is displayed.
Press the S button.
(6) Press the M button to set the temporary value as a determined value and complete correction of
the flow rate.
Press the S button to cancel the Flow Rate Correction Mode and return to the Flow Rate Display Mode.
Flow Rate Correction Check Mode
Flow Rate Correction Mode
Change to a
temporary value.
Setting the
determined value of
the flow rate
(Flow Rate Indicator Value:
760L/m → 800L/m).
Press the M button.
A newly set value of the flow rate is displayed.
Flow Rate Correction Check Mode
Flow Rate Correction Mode
Press the S button.
The previous value of the
flow rate is displayed.
Canceling the value
8.2 Address Number Setting
The address number is required to set when installing and operating multiple flowmeters and the
EMS-624E type Flowmeter Integrator to one fire engine.
Any number of 1 to 6 is settable for the address number.
WARNING
Never set the same address numbers for different flow meters in one vehicle. Only a
unique number is acceptable.
Setting the address number while the flowmeter is being connected to another
flowmeter or the Flowmeter Integrator may cause a failure or malfunction. Make sure
that the flowmeter is not connected to any other flowmeter or the Flowmeter
Integrator when setting the address number.
(1) Supply the power.
- When the power is supplied to the Flowmeter, the Flow Rate Display Mode is displayed
after the initial display.
(2) Press the S button and the P button simultaneously for 40 seconds or more.
- After 20 seconds or more, the mode is changed to Flow Rate Correction Mode. Press the
buttons continuously. After 40 seconds or more, the display is changed to the Address Setting
Mode to indicate the address number currently registered.
Flow Rate Correction Mode
Address Setting Mode
Flow Rate Display Mode
20 sec.
later
Press the S button and the P button
simultaneously for 40 seconds or more.
20 sec.
later
The address number that currently set is displayed.
Ex.: The address number is set to ID.3.
* The following description is given as an example for changing the address number of the Flowmeter when
the address number is set to 3.
(3) Press the P button or the M button of the Readout and set a desired address number.
Press the P button once to increment the value of the address number by 1. Press the M button once
to decrement the value of the address number by 1.
Address Setting Mode
P button
Press to increment the address number.
M button
Press to decrement the address number.
(4) When the setting is completed, press the S button to set the address number.
Address Setting Mode
Flow Rate Display Mode
Change to the set value.
Ex.:
Change from ID.3 to ID.1.
Press the S button.
The address setting finishes and the value of the flow rate is displayed.
(5) Turn off the power supply and turn on again. Check that the set address is correct.
(6) The same procedures are taken to set the address numbers of other flowmeters.
9 Maintenance
9.1 Cleaning of Electrodes
The electrodes are provided on both sides of the pipeline of the Sensor of the Electromagnetic
Flowmeter. When the electrodes are covered with insulating material such as grease and oil film or
when rust is attached to the pipe, the detection range of the Sensor is decreased and the value of the
flow rate of water displayed on the Readout may not be correct. In order to avoid such inconvenience,
clean the electrodes of the Sensor in the following cases:
- When liquid such as water containing a great amount of oil is used
- Before correction of the flow rate
- At regular maintenance and cleaning of the interior of the Sensor
(Regular cleaning is required by every 2 weeks for 6 months after the delivery of a fire engine.)
When cleaning the electrodes, open the ball cock, light the interior of the Sensor with a flashlight,
and check the position of the electrodes.
Wipe the electrode faces with a stick around which a cloth containing volatile solvents such as
thinner or methanol is wound.
Each of the electrodes is made of a corrosion-resistant stainless steel SUS316 having the diameter of
10 mm. The electrodes are located at both the left and right sides from the center of the Sensor, as
illustrated below, and the amount of projection toward the inside of the Sensor is 1 mm.
Even though the pipe of the Sensor is made of glass fiber reinforced plastic, take care not to
damage it.
Flow
Positions of Electrodes
Flow
9.2 Electrode Test
This Flowmeter performs an electrode test to detect dirt or contamination on the electrode of the
Sensor with operation of the button on the Sensor.
WARNING No matter whether water is in the pipe (the flow channel) or not, perform the
electrode test in a state that two electrodes of the Sensor are completely soaked in
the water.
(1) Make sure that the power is supplied to the Flowmeter and that the Flowmeter is operational.
(2) Cause two electrodes of the Sensor of the Flowmeter to be completely soaked in the water.
(3) Press the P button and the M button of the Readout of the Flowmeter simultaneously, the
message “_on_” in the electrode test mode is displayed. If you press the P button and the M button
continuously for another several seconds, the result of the electrode test is displayed on the Readout.
When the electrode is normal (clean) and possible to measure the flow rate, the message “_GO_” is
displayed on the Readout. When the electrode is significantly dirty or the two electrodes are not
soaked in the water, the message “_Err_” is displayed on the Readout.
Test Result is Normal
Flow Rate Display Mode
Electrode Test Mode
Continuously press the buttons until the result
of the electrode test is displayed.
Test result is not Normal
Press the P button and the M
button simultaneously.
Continuously press the
buttons even after the
display has been changed.
Flow Rate Display Mode
Release the button to switch to the flow rate display mode.
When the test result is not normal, clean the electrode of the Sensor and conduct the
test again.
(4) When the result of the electrode test is displayed as “Err_”, the electrode may be dirty or
contaminated. Perform the same operation after cleaning the electrode and make sure that the
electrode functions normally.
When the marks A and B of the flow rate on the Readout blink at the normal discharge of water
and the Readout shows the flow rate value as “0L/min,” the electrode may be significantly dirty
or contaminated. Perform the same operation after cleaning the electrode and make sure that
the electrode functions normally.
The marks A and B of the flow rate displayed on the Readout may also blink when no water
remains in the flow channel but this is not a malfunction.
9.3 Others
Contact us in a case any values displayed on the Readout are not corrected with the method of
correction of the flow rate of water.
Never modify, repair, or remodel. Doing so may cause malfunction or damage due to abnormal
operation.
WARNING
Do not use volatile solvents such as thinner other than cleaning of the
electrode.
10 Outline Drawings
300E Readout
Power Supply Connection Cable
Operation Switches
Sensor Connection Cable
Flowmeter Integrator Connection Cable
Unit : mm
300ET Readout
Power Supply Connection Cable
Operation Switches
Sensor Connection Cable
Flowmeter Integrator Connection Cable
Unit: mm
24-B(BC6) Sensor
Flow
Flow
(Effective Depth D = 15 mm)
(Mounting Screw)
(Same Work on Opposite Side)
Position of Electrode
Unit : mm
24-C(ADC6) Sensor
Flow
Flow
(Effective Depth D = 15 mm)
(Mounting Screw)
(Same Work on Opposite Side)
Position of Electrode
Unit : mm
Electromagnetic Flowmeter User Manual Doc No. 21305M-MAUserManual-07
Versions
Issued on
Revision History
Contact us should you have any questions about operations related to various settings, and
corrections. Never modify, repair, or remodel. Doing so may cause malfunction or damage due to
abnormal operation.
Kokusai Gijutsu Kaihatsu Corporation Ltd.
Asahi Seimei Building
2-3-9 Amanuma Suginami Tokyo 167-0032
TEL: +81-3-3398-2151 / +81-50-3537-2142
FAX: +81-3-3398-0014
Website: http://www.kgk.co.jp
List of Errata
We apology partial corrections to the following content of “EMF300E Series Electromagnetic
Flowmeter.”
Correction
Incorrect
Correct
3. Readout Software Version Display
KGK Corp.
3. Readout Software Version Display