Azbil MagneW Plus+, MGG14C User Manual

CM2-MGG31F-2001
MagneW PLUS+
Electromagnetic Flowmeter
F
oundation Fieldbus Transmitter
Model MGG14C
User’s Manual
© 2014–2018 Azbil Corporation All Rights Reserved.
Be sure that the user receives this manual before the product is used.
While this information is presented in good faith and believed to be accurate, Azbil Corporation disclaims the implied warranties of merchantability and tness for a particular purpose and makes no express warranties except as may be stated in its written agreement with and for its customer. In no event shall Azbil Corporation be liable to anyone for any indirect, special or consequential damages. is information and specications in this document are subject to change without no­tice.
MagneW™ is a trademark of Azbil Corporation. F™ Fieldbus is a trademark of FieldComm Group.
Precaution
is device is designed and manufactured for the use of general applications. Do not use this device for the nuclear applications and applications which are directly related to the human life. Also do not use this device in the radiation controlled area.
In case the device is used in the following applications, please make sure to use the device with the system designed as failsafe/ redundant and the system should be maintained periodically.
• Safety device for human body protection
• Directly control the transport machine
• Aircra
• Space appliance
Azbil Corporation disclaims any liability for damages caused by any of accidents/results by the above application.
SAFETY PRECAUTIONS
About Icons
e safety precautions described in this manual are indicated by various icons.
Please be sure you read and understand the icons and their meanings described below before reading the
rest of the manual.
Safety precautions are intended to ensure the safe and correct use of this product, to prevent injury to the
operator and others, and to prevent damage to property.
Be sure to observe these safety precautions.
Warnings are indicated when mishandling this product might
WARNING
CAUTION
result in death or serious injury.
Cautions are indicated when mishandling this product might result in
minor injury to the user, or only physical damage to the product.
Examples
In describing the product, this manual uses the icons and conventions listed below
.
Use caution when handling the product.
The indicated action is prohibited.
Be sure to follow the indicated instructions.
SAFETY REQUIREMENTS
To reduce risk of electric shock which could cause personal injury, follow all safety notices in this
documentation.
WARNING
This symbol warns the user of a potential shock hazard where hazardous live voltages may be accessible.
i
Safety messages
Carefully read this section before installing or operating this device.
Cautions for installation
Installation of the device should be done by the expert from the safety perspective.
In case of the installation in the hazardous area, follow the regulation/guidance of the explosion-proof.
In case of the installation in the hazardous area, select the explosion-protected apparatus.
Do not use the non-explosion-protected apparatus in the hazardous area.
Install the device in the environment where the following is within in the specifications listed in the specification sheet.
Ambient temperature, process fluid temperature
Process fluid pressure
Humidity
Vibration
Power supply voltage
Environment which exceeds the specifications may cause fire or device damage and it may cause injury.
WARNING
CAUTION
DO NOT use the installed device as foot hold. It may cause the damage of the device.
DO NOT hit the glass of the device by tools. It may cause the damage of the device.
Install the device in a location with an ambient temperature of -25 °C to 60°C (-13 °F to 140 °F) and an ambient humidity of 5 to 100% RH to prevent device malfunction or output errors.
DO NOT install the device near high-current power lines, motors, or transformers to pre­vent damage from electromagnetic induction, which can cause device malfunction or output errors.
DO NOT use the device to ground a welder. It can damage the device.
Be sure to ground the welding power transformer when welding near the device to avoid output errors.
DO NOT install the device in the severe vibration area or in corrosive environment. It may damage the device, or cause the fume of the device.
DO NOT install the device on the bridge or deck of the ship.
DO NOT install the device on in the severe vibration area on the ship.
Be sure to use the metal conduit for the cables between the remote style transmitter and flowtube.
Be sure to install the flowtube with a distance of 500mm minimum from the other flow­tube. Magnetic field generated by a flowtube may affect the other flowtube and it may cause the output errors.
DO NOT install the device in a location subject to direct sunlight, wind, rain, severe vibra­tion, or in a highly corrosive atmosphere. The transmitter and flowtube can be damaged.
ii
Cautions for wiring
DO NOT wire with wet hands. DO NOT wire while the circuit is alive. It may cause electrical shock.
ELECTRIC SHOCK HAZARD! Turn the power supply OFF before opening the transmitter cover.
Wiring of the device should be done by the expert from safety perspective.
Wire the cables to the correct terminal. Incorrect wiring may damage the device or cause the fume of the device.
Connect the correct power supply. Incorrect power supply may damage the device or cause the fume of the device.
Be sure to properly ground the device. Improper grounding may cause the output errors
DO NOT give impact to the device. It may cause the damage of the device.
WARNING
CAUTION
Be sure to use the power supply with the overcurrent protection function.
Be sure proper wiring. Incorrect wiring may cause the damage of the device.
Be sure to properly tighten the terminal cover on the terminal box so that water does not penetrate in the terminal.
DO NOT connect AC power supply to the DC power supply model. The wrong power sup­ply damages the device.
Turn off the Fieldbus power supply before connecting the Fieldbus cable to the transmit­ter. The transmitter or the Fieldbus power supply can be damaged. This type of damage is not covered by Azbil Corporation’s warranty.
Be sure to plug all unused conduit connections with a water tight plug.
In case that a remote model is installed in a ship, the cables between the transmitter and flowtube must be covered with a flexible metal conduit.
Switch the control equipment to manual control before terminating the device opera­tion and shutting off the output to the control equipment. This action prevents the power shut-off from directly affecting the control equipment.
iii
iv

Table of Contents

1. Introduction ...........................................................1-1
1.1 System configuration ..............................................................1-1
1.2 F Fieldbus .............................................................1-2
1.3 Main components .................................................................1-4
1.4 Local user interface ...............................................................1-5
2. Overview of MagneW PLUS+ Foundation Fieldbus .........................2-1
2.1 Overview ........................................................................2-1
2.2 Structure of MagneW PLUS+ F Fieldbus .....................................2-1
2.2.1 System/network Management VFD ............................................2-1
2.2.2 Function Block VFD ........................................................2-2
2.2.3 Function block .............................................................2-2
2.2.4 Transducer Block ...........................................................2-2
2.3 VFD/Object correlation diagram ....................................................2-3
2.4 Wiring .........................................................................2-4
2.5 Others .........................................................................2-5
3. Installation ............................................................3-1
3.1 Before installing electromagnetic flowmeter ..........................................3-2
3.2 Installation of transmitter ..........................................................3-3
4. Startup and Shutoff ....................................................4-1
4.1 Startup .........................................................................4-1
4.2 Steps before measurement ..........................................................4-2
4.3 Shutoff .........................................................................4-5
5. Basic Settings by Fieldbus Communication ...............................5-1
5.1 Fieldbus communication menu .....................................................5-2
5.2 Zero adjustment ..................................................................5-3
5.3 Basic settings .....................................................................5-4
6. Maintenance and Troubleshooting ......................................6-1
6.1 Troubleshooting ..................................................................6-1
6.2 Input of simulated signals from calibrator ............................................6-6
6.3 Measurement of excitation current ..................................................6-7
Appendix A. View List .................................................... A-1
Appendix B. Parameter List .............................................. B-1
Appendix C. Menu Configuration ..........................................C-1
v
vi

1. Introduction

This chapter contains an overview of the model MGG14C MagneW PLUS+ Flowmeter and F Fieldbus system. It describes available configurations and provides definitions for all the major parts of the transmitter.
MagneW PLUS+ Flowmeter
Thank you for purchasing the Azbil Corporation model MGG14C MagneW PLUS+ Flowmeter This system features:
• Advanced multi-variable capacity
• Digital panel display
• Intuitive, versatile operator interface with large characters and backlit liquid crystal display
• I/O Capacity
• Flexible digital communication using the F Fieldbus

1.1 System configuration

The model MGG14C MagneW PLUS+ Flowmeter consists of a flowtube and a transmitter which operate on the principles of Faraday’s law. The flowmeter is available in two configurations:
Integral
Remote
– The transmitter is mounted directly on the flowtube and they are installed as an
integrated unit on the fluid pipe.
– The transmitter and flowtube are installed separately and connected together
via cables
Figure1-1 Indegral system
1-1

1.2 Foundation Fieldbus

The F Fieldbus provides communications and programmability for a single or multiple flowmeter system. Some features of the fieldbus include:
• Complies with F Fieldbus H1 (31.25 kbps voltage mode bus) specifications.
• Supports the standard Analog Input (AI) function block.
• Is an externally powered device – AC and DC powered models available.
• Comes with Enhanced Device Description (EDD) files and a Capability File (CF) for automatic configuration.
The following figure shows a system in which the flow rate is output with a F Fieldbus.
Figure1-2 Remote system
1-2
Figure1-3 System using a Foundation Fieldbus
1-3

1.3 Main components

The transmitter consists of the components shown in the figure below.
Figure1-4 Main components
(1)
Local user interface
can be accessed using the four infrared sensor keys on the panel.
(2)
Fieldbus interface board
(3)
Main board
(4)
Power supply board
(5)
Terminal
(6)
Name plate
manufacture and the flowtube constant (EX) for the flowmeter.
(7)
Tag number plate
– This board includes fundamental functions of the flow measurement.
– Encloses the input/output terminals. Contains an integrated 12 kV, 1000A isolator.
– Indicates model numbers and production numbers, power supply requirements, date of
– Indicates the instantaneous flow rate or the totalized valve. The flowmeter functions
– Includes the fieldbus communication function.
– There are two types, AC power supply, and DC power supply type.
– Indicates the tag number as specified in the product order.
1-4

1.4 Local user interface

Figure1-5 Local user interface
Display MEASURING MODE
Main display Indicates a value set by PARAM_SELECTION
under the block selected by BLOCK_TAG_SEL. Indicates maximum four values cyclically.
Auxiliary display
Upper auxiliary display
Indicates the information of [Tag, unit, or status] set by DISPLAY_INFO_SEL cyclically.
Lower auxiliary display
Indicates percent flow rate with bar indicator. Range is set by EU_100, and EU_0.
Other than MEASURING
MODE
Indicates flow velocity.
Indicates procedures for the parameter setting or adjustment.
1-5
The following table is a summary of the functions of each of the keys.
1-6
How to operate the infrared touch sensor
For best results, approach the key from below and completely cover the circle. Then move your finger straight down to its original position. These motions ensure correct operation. Moving sideways across the keys can accidentally activate the wrong control.
Figure1-6 Using the touch senser keys
1-7
Local user interface operation
The following table describes the functions available in each mode.
Display
MEASURING MODE This is the normal operational mode and indicates the measuring
BASIC SETUP MODE This mode is used to change data settings that must be recorded or
MAINTENANCE MODE
ADVANCED MODE This mode is used to apply some specific noise immunity functions.
MEASURING MODE
Other than MEASURING MODE
status. Each time the MEASURING MODE is selected, data is written into memory. Settings entered in other modes are held in temporary memory for two minutes, but will return to the previously saved value unless the MEASURING MODE is selected to save the data. The only exception is the counter, which is always saved into memory immediately.
changed frequently. These settings include: TAG NO. Damping time constant Auto zero Detector data
This mode is used when adjustment or verification is required for regular maintenance of the system or when troubleshooting the system. This mode includes: Shipping information Output adjustment Gain adjustment This mode is further divided into the following two modes: OUTPUT CHECK MODE CALIBRATION MODE
This mode includes: Damping Manual zero Averaging Auto spike Cut Coefficient Drop out Low-flow cut off Flow direction change
1-8
AI – 01 PV
The screen returns to MEASURING mode
MEASURING MODE
to BASIC SETUP
Move the cursor under “Y” and press key.
Push 3 seconds
MODE
ENTER BASIC SET
YES OR
NO
in case of no operation for 8 seconds.
Move the cursor under “N” and
* BASIC SETUP
MODE
Figure1-7 How to enter BASIC SETUP
* In the BASIC SETUP mode, flow velocity in m/s appears on the upper auxiliary display. * After entering the BASIC SETIP mode, if do not operate anything for 10 minutes, the
screen automatically returns from BASIC SETUP mode to MEASURING MODE.
1-9
*
2 seconds later
BASIC SETUP
to Fig1-11 screen
*
PD TAG 1/2
YA – RC - 001
*
PD TAG 2/2
YA – RC - 001
*
NODE ADRESS
FFh
*
MEMO
*
DAMPING
*
AUTO ZERO
READY
MODE
XXXXXXXX
003.0 s
s
*
MODE ENTER
ADVANCED
*
MODE ENTER
MAINTENANCE
*
DENSITY
*
SVR 10.000 m/s
1.0000
70.686 t/h
to Fig1-10 screen
*
MGG DIA
M
*
DUMMY
EX 300.0
50.0
0
Figure1-8 BASIC SETUP MODE
*
PVR 10.000 m/s
70.686
m3/h
1-10
2 seconds later
& ADVANCED
MODE
& COEFFICIENT
1.0000
& MANUAL ZERO
READY
& AVARAGING
OFF
& PV SPIKE CUT
OFF
& PV SPIKE CUT
TIME 00.0 s
& PV SPIKE CUT
LEVEL 00.0 %
& SV SPIKE CUT
OFF
& MODE RETURN
BASIC SETUP
& FLOW SWITCH 2
HYSTERISIS
& FLOW SWITCH 2
SP
.00000 t/h
& FLOW SWITCH 2
MODE LOW
& FLOW SWITCH 2
SOURCE SV
& FLOW SWITCH 1
HYSTERISIS 0%
& FLOW SWITCH 1
SP
.00000 m3/h
0%
& SV SPIKE CUT
TIME 00.0S
& SV SPIKE CUT
& PV L-FLOW CUT
LEVEL
& SV L-FLOW CUT
LEVEL
LEVEL 00.0 %
10%
10%
Figure1-9 ADVANCED MODE
& FLOW SWITCH 1
MODE LOW
& FLOW SWITCH 1
SOURCE
& FLOW DIRECTION
& EX FREQUENCY
PV
FORWARD
12.5 Hz
1-11
> MAINTENANCE
MODE
> CALIBRATION
> SHIPPING INFO
> MODE RETURN
BASIC SETUP
OFF
OFF
Figure1-10 MAINTENANCE MODE
1-12

2. Overview of MagneW PLUS+ Foundation Fieldbus

2.1 Overview

This chapter contains an overview of the model MGG14C MagneW PLUS+ F Fieldbus transmitter.
Model MGG14C MagneW MagneW PLUS+ flowtube and measures the conductive fluid flow rate. It outputs the following with the F Fieldbus protocol.
 Primary value of Flow TB: volumetric flow rate  Secondary value of Flow TB: mass flow rate  Primary value of Diag TB: scale level by scale diagnostic
Those outputs are displayed on the following Display panel.
Fieldbus is a widely used bi-directional digital communication protocol for field devices that enable the simultaneous output to many types of data to the process control system.
PLUS+ F Fieldbus transmitter is coupled with the
MODE
The MagneW by the FieldComm Group, and provides interoperability between Azbil devices and those produced by other manufacturers.
Fieldbus comes with software consisting of three AI function blocks that enable the flexible implementation of systems.
PLUS+ Fieldbus communication type employs the specification standardized

2.2 Structure of MagneW PLUS+ Foundation Fieldbus

The MagneW PLUS+ contains two Virtual Field Devices (VFD), one is System/network Management VFD and the other is Function block VFD.

2.2.1 System/network Management VFD

• Sets node addresses and Physical Device tags (PD Tag) necessary for communication.
• Controls the execution of function blocks.
• Manages operation parameters and communication resources (Virtual Communication Relationship:VCR).
2-1

2.2.2 Function Block VFD

It includes some objects to execute function block applications. Resource block, Function block, and Transducer block are one of the objects.
Transducer block

2.2.3 Function block

AI * 2 (3) 30
DI 2 30 1800, 1900 For flow limit switches
PID 1 45 2000
AR 1 30 2100
TOT 2 30 2200, 2300 For totalization volume
Resource block
Function block
Alert object
Trend object
View object
Link object
Block name
Number
• Manages the status of The
• Automatically informs the host of any detected faults or other problems based on the NAMUR NE107.
It links together with Transducer block or other function block and provides arithmetic processing and transmits.
It provides interface function between the hardware and function block.
It provides processing for the event or alarm generated in function block.
Object to transmit trend data collected in short time
Object that provides information of each parameter in the function block.
Objects that links the above mentioned objects.
Execution
time (ms)
INDEX Note
1500, 1600, (1700)
MagneW PLUS+
For volumetric flow rate and mass flow rate
PID function block execute a control algorithm to minimize the error as the difference between a measured process variable and desired setpoint. It also has functions of cascade control, feed forward control, and alarm detection.
Arithmetic block perform an arithmetical operation to the flow measurement value.
hardware.
* Number of AI becomes three when selecting flow signal analysis function.
Flow signal analysis function will be provided as call factory basis. Consult your azbil representative.

2.2.4 Transducer Block

Flow transducer block
Display transducer block Block that controls the LCD display
Diag transducer block Block that executes the diagnosis
Block name Description
Block that calculates the flow speed, volumetric flow rate, and mass flow rate
2-2

2.3 VFD/Object correlation diagram

Device
Basic information control
Function block Control function
LAS
Communication stack
(FMS/FAS/DLL)
Physical layer (PHL)
H1 Fieldbus Line
/
VCR control
VCR VCR VCR VCR VCR
Function block VFD
Resource block
AI Function
Link object
FF standard transducer block
(FLOW/Positioner/Pressure)
View Object
2-3
Figure2-1 VFD/Object correlation diagram
DI Function
Senso r
Trend Object
Display
Display transducer block
PID Function
Alert Object
2-3

2.4 Wiring

The number of devices that can be connected to a single bus and the cable length vary depending on system design. When constructing systems, both the basic and overall design must be carefully considered to achieve optimal performance.
Fig 2-2 shows typical wiring to the Fieldbus network. The following are required for use with Fieldbus devices:
• Terminator:
Fieldbus requires two terminators. Refer to the supplier for details of terminators that are attached to the host.
• Field devices:
Connect Fieldbus communication type MagneW
PLUS+. Two or more MagneW PLUS+
devices or other devices can be connected.
• Host:
Used for accessing field devices. A dedicated host (such as DCS) is used for an instrumentation line while dedicated communication tools are used for experimental purposes. For operation of the host, refer to the instruction manual for each host. No other details on the host are given in this manual.
• Cable:
Used for connecting devices. For laboratory or other experimental use, a twisted pair cable
2
two to three meters in length with a cross section of 0.9 mm
or more and a cycle period of within 5 cm (2 inches) may be used. Termination processing depends on the type of device being deployed. For MagneW PLUS+, use an M4 screw terminal claw. Some hosts require a connector. Refer to Azbil Corporation when making arrangements to purchase the recommended equipment. Connect the devices as shown in Figure 2-2. Connect the terminators at both ends of the trunk, with a minimum length of the spur laid for connection.
Table 2-1 Fieldbus cable
Classification Description Size Maximum length
2
A Type A Fieldbus cable 0.8 mm
B Type B Fieldbus cable 0.32 mm
C Type C Fieldbus cable 0.13 mm
D Type D Fieldbus cable 1.25 mm
(18AWG) 1900m
2
(22AWG) 1200m
2
(26AWG) 400m
2
(16AWG) 200m
Table 2-2 Resistance of the Fieldbus cable
Classification Maximum resistance @ 25ºC
A 22 /Km
B 56 /Km
C 132 /Km
D 20 /Km
2-4

2.5 Others

Figure2-2 Cabling
Connect/disconnect the fieldbus devices
Before connecting/disconnecting the fieldbus device to the network, make sure this activity does not affect the process.
Fieldbus network allows device connection/disconnection to the network while the device circuit is alive. However from the process safety perspective, the device connection/ disconnection to the network after turn off the power is suggested.
Make sure to properly isolate the wires after disconnecting the device.
Non-fieldbus device
Non-fieldbus device is not allowed to connect to the fieldbus network.
Communication error and miss-wiring
If communication error appears, the device repeats sending the signal/message until it is received by the host system. This kind of the communication error appears when the wiring is improper.
Check the wiring if communication error appears.
2-5
2-6

3. Installation

Overview
Installation of the device should be done by the expert from the safety perspective.
In case of the installation in the hazardous area, follow the regulation/guidance of the explosion-proof.
In case of the installation in the hazardous area, select the explosion-protected apparatus. Do not use the non-explosion-protected apparatus in the hazardous area.
Install the device in the environment where the following is within in the specifications listed in the specification sheet.
Ambient temperature, process fluid temperature
Process fluid pressure
Humidity
Vibration
Power supply voltage
Environment which exceeds the specifications may cause fire or device damage and it may cause injury.
This chapter describes the installation and wiring of the device in the following order:
- Criteria for selecting the installation environment
- Overview of the device installation
- Wiring of signal cables
WARNING
CAUTION
DO NOT use the installed device as foot hold. It may cause the damage of the device.
DO NOT hit the glass of the device by tools. It may cause the damage of the device.
Install the device in a location with an ambient temperature of -25 °C to 60°C (-13 °F to 140 °F) and an ambient humidity of 5 to 100% RH to prevent device malfunction or output errors.
DO NOT install the device near high-current power lines, motors, or transformers to pre­vent damage from electromagnetic induction, which can cause device malfunction or output errors.
DO NOT use the device to ground a welder. It can damage the device.
Be sure to ground the welding power transformer when welding near the device to avoid output errors.
DO NOT install the device in the severe vibration area or in corrosive environment. It may damage the device, or cause the fume of the device.
DO NOT install the device on the bridge or deck of the ship.
DO NOT install the device on in the severe vibration area on the ship.
Be sure to use the metal conduit for the cables between the remote style transmitter and flowtube.
Be sure to install the flowtube with a distance of 500mm minimum from the other flow­tube. Magnetic field generated by a flowtube may affect the other flowtube and it may cause the output errors.
DO NOT install the device in a location subject to direct sunlight, wind, rain, severe vibra­tion, or in a highly corrosive atmosphere. The transmitter and flowtube can be damaged.
3-1

3.1 Before installing electromagnetic flowmeter

Criteria for selecting the installation environment Getting started Select the optimal location for installing the device according to the following criteria in order to maximize its performance.
Note:
- Install the device in a location with an ambient temperature of -25 °C to 60 °C (-13 °F to 140 °F) and an ambient humidity of 5 to 100% RH to prevent device malfunction or output errors.
- DO NOT install the device near high-current power lines, motors, or transformers to prevent damage from electromagnetic induction, which can cause device malfunctions or output errors.
- DO NOT use the device to ground a welder. Doing so can damage the device.
- Be sure to ground the welding power transformer when welding near the device.
- DO NOT install the device in an area with severe vibrations or in a corrosive environment. Doing so may cause damage the device.
- DO NOT install the device in a location subject to direct sunlight, wind, or rain.
WARNING
Use this product under the conditions as defined in the specifica­tions (e.g., protection against explosion, pressure rating, temperature, humidity, voltage, vibration, shock, mounting direction, and atmo­sphere) to avoid failure of the device or harmful physical effects such as fire damage.
WARNING
In case of the installation in the hazardous area, select the explosion­protected apparatus. Do not use the non-explosion-protected appara­tus in the hazardous area.
3-2

3.2 Installation of transmitter

Mounting bracket Material: SPCC (Zinc plating)
2B-pipe
2B-pipe mounting
Installation of transmitter
Basic mounting methods
The transmitter can be mounted in three ways—integrated mounting with the flowtube, wall-mounting, and 2B-pipe mounting
Mounting plate
Terminal box
Tag number plate
Figure3-1 Wall-mounting of transmitter
Figure3-2 2B-pipe mounting of transmitter and Integrated mounting
3-3
Electrical wiring (1)
DO NOT wire with wet hands. DO NOT wire while the circuit is alive. It may cause electrical shock.
ELECTRIC SHOCK HAZARD! Turn the power supply OFF before opening the transmitter cover.
Wiring of the device should be done by the expert from safety perspective.
Wire the cables to the correct terminal. Incorrect wiring may damage the device or cause the fume of the device.
Connect the correct power supply. Incorrect power supply may damage the device or cause the fume of the device.
Be sure to properly ground the device. Improper grounding may cause the output errors
DO NOT give impact to the device. It may cause the damage of the device.
WARNING
CAUTION
Be sure to use the power supply with the overcurrent protection function.
Be sure proper wiring. Incorrect wiring may cause the damage of the device.
Be sure to properly tighten the terminal cover on the terminal box so that water does not penetrate in the terminal.
DO NOT connect AC power supply to the DC power supply model. The wrong power sup­ply damages the device.
Turn off the Fieldbus power supply before connecting the Fieldbus cable to the transmit­ter. The transmitter or the Fieldbus power supply can be damaged. This type of damage is not covered by Azbil Corporation’s warranty.
Be sure to plug all unused conduit connections with a water tight plug.
In case that a remote model is installed in a ship, the cables between the transmitter and flowtube must be covered with a flexible metal conduit.
Switch the control equipment to manual control before terminating the device opera­tion and shutting off the output to the control equipment. This action prevents the power shut-off from directly affecting the control equipment.
Introduction The electromagnetic flowmeter needs to be connected to the main power supply (AC or DC 24 V) for proper operation. The following items are described in relation to the electrical wiring of the electromagnetic flowmeter.
3-4
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