YOKOGAWA DT450G Series User manual

User’s
Manual Model DT450G
Dust Monitor
IM 11K01C01-01E
IM 11K01C01-01E
5th Edition

i
IM 11K01C01-01E
<Introduction>
Introduction
The DT450G Dust Monitor is a process instrument designed to detect solid particles ingas and
integrates a control unit and a sensor probe into a compact enclosure. The DT450G can be
used in a wide variety of applications, including continuous monitoringof the dust content of the
exhaust gas.
This manual describes the procedures for installing, operating, inspecting and maintainingthe
DT450G Dust Monitor. Before using the instruments, thoroughly read themanual to ensure
optimum performance.
This manual consists of six chapters. For your reference, the following table shows theoutlines
of each chapter and indicates which chapters should be read for installation,operation or
maintenance work.
Table of Contents
Chapter Outline Relates to
Installation Operation Maintenance
1. Overview Standard specications, Model and Su󰀩x codes
(or part number), and dimensions. B C B
2. Installation Installation procedures, etc. A C
3. Piping/Wiring Piping and wiring procedures. A C
4. Operation Operation and display in detail. A C
5. Inspection and
Maintenance
Inspection/Maintenance B A
6. Troubleshooting Failures, possible causes, and remedies C A
CMPL (parts list) User replaceable parts list C B
CMPL:Customer Maintenance Parts List
A: Read and completely understand before operating the equipment.
B: Read before operating the equipment, and refer to it whenever necessary.
C: Recommended to read at least once.
Media No.IM 11K01C01-01E (YK) 5th Edition :July 2018 (YK)
All Rights Reserved Copyright © 2005, Yokogawa Electric Corporation

ii
IM 11K01C01-01E
<Introduction>
For the safe use of this equipment
CAUTION
Connect the power supply cord only after conrming that the supply voltage matches the rating of
this equipment. In addition, conrm that the power is switched o󰀨 when connecting power supply.
Some process gas is dangerous to people. When removing this equipment from the process line
for maintenance or other reasons, protect yourself from potential poisoning by using a protective
mask or ventilating the area well.
lAbout This Manual
• This manual should be passed on to the end user.
• The contents of this manual are subject to change without prior notice.
• The contents of this manual shall not be reproduced or copied, in part or in whole, without
permission.
• This manual explains the functions contained in this product, but does not warrant that those
will suit the particular purpose of the user.
• Every e󰀨ort has been made to ensure accuracy in the preparation of this manual. However,
should any errors or omissions come to the attention of the user, please contact the nearest
Yokogawa Electric representative or sales o󰀩ce.
• This manual does not cover the special specications. This manual may not be changed
on any change of specication, construction and parts when the change does not a󰀨ect the
functions or performance of the product.
• If the product is used in a manner not specied in this manual, the safety of this product may
be impaired.
l SafetyandModicationPrecautions
• Follow the safety precautions in this manual when using the product to ensure protection
and safety of personnel, product and system containing the product.
• The following safety symbols and wordings are used on the product as well as in this
manual.
lThe following safety symbols are used on the product as well as in this
manual.
WARNING
This symbol indicates that an operator must follow the instructions laid out in this manual
in order to avoid the risks, for the human body, of injury, electric shock, or fatalities. The
manual describes what special care the operator must take to avoid such risks.
CAUTION
This symbol indicates that the operator must refer to the instructions in this manual in order
to prevent the instrument (hardware) or software from being damaged, or a system failure
from occurring.
CAUTION
This symbol gives information essential for understanding the operations and functions.

iii
IM 11K01C01-01E
<Introduction>
NOTE
This symbol indicates information that complements the present topic.
This symbol indicates Protective Ground Terminal.
This symbol indicates Function Ground Terminal. Do not use this terminal as the protective
ground terminal.
lSpecial descriptions in this manual
This manual indicates operation keys, displays and drawings on the product as follows:
• Operation keys, displays on the panel
(Ex. message display → "BASE")
(Ex. data display → "102" lit, "102" ashing)

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IM 11K01C01-01E
<Introduction>
NOTICE
l Specicationcheck
When the instrument arrives, carefully unpack and check that the instrument has not been
damaged during transportation. Please make sure that the product received meet the purchase
order specications and all the accessories are present. Specications can be checked by the
model codes indicated on the nameplate. For details of the model codes, refer to Chapter 1,
“Overview.”
lDetails on operation parameters
The DT450G is preset with defaults prior factory shipment. Before measurement, verify that
these factory default settings meet the operating conditions and if necessary, recongure
parameters. For checking the parameter settings, refer to Chapter 4.
It is recommended that the recongured parameter settings be recorded.
lHow to dispose the batteries:
This is an explanation about the new EU Battery Directive (DIRECTIVE 2006/66/EC). This
directive is only valid in the EU.
Batteries are included in this product. Batteries incorporated into this product cannot be removed
by yourself. Dispose them together with this product.
When you dispose this product in the EU, contact your local Yokogawa Europe B.V.o󰀩ce. Do not
dispose them as domestic household waste.
Battery type: silver oxide battery
Notice:
The symbol (see above) means they shall be sorted out and collected as ordained in ANNEX II in
DIRECTIVE 2006/66/EC

v
IM 11K01C01-01E
<Introduction>
After-Sales Warranty
lDo not modify the product.
lDuring the warranty period, for repair under warranty carry or send the product to the local
sales representative or service o󰀩ce. Yokogawa will replace or repair any damaged
parts and return the product to you.
lBefore returning a product for repair under warranty, provide us with the model name
and serial number and a description of the problem. Any diagrams or data explaining the
problem would also be appreciated.
lIf we replace the product with a new one, we won’t provide you with a repair report.
lYokogawa warrants the product for the period stated in the pre-purchase quotation.
Yokogawa shall conduct dened warranty service based on its standard. When the
customer site is located outside of the service area, a fee for dispatching the maintenance
engineer will be charged to the customer.
lIn the following cases, customer will be charged repair fee regardless of warranty period.
• Failure of components which are out of scope of warranty stated in instruction manual.
• Failure caused by usage of software, hardware or auxiliary equipment, which Yokogawa
Electric did not supply.
• Failure due to improper or insu󰀩cient maintenance by user.
• Failure due to modication, misuse or outside-of-specications operation which Yokogawa
does not authorize.
• Failure due to power supply (voltage, frequency) being outside specications or abnormal.
• Failure caused by any usage out of scope of recommended usage.
• Any damage from re, earthquake, storms and oods, lightning, disturbances, riots,
warfare, radiation and other natural changes.
lYokogawa does not warrant conformance with the specic application at the user site.
Yokogawa will not bear direct/indirect responsibility for damage due to a specic application.
lYokogawa Electric will not bear responsibility when the user congures the product into
systems or resells the product.
lMaintenance service and supplying repair parts will be covered for ve years after the
production ends. For repair for this product, please contact the nearest sales o󰀩ce
described in this instruction manual.

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IM 11K01C01-01E
<CONTENTS>
Model DT450G
Dust Monitor
CONTENTS
IM 11K01C01-01E 5th Edition
Introduction ..............................................................................................................i
For the safe use of this equipment .................................................................... ii
NOTICE................................................................................................................. iv
After-Sales Warranty ........................................................................................... v
1. Overview.................................................................................................... 1-1
1.1 ProductOverview ............................................................................................. 1-1
1.2 Specications.................................................................................................... 1-2
1.3 ModelandSu󰀩xCodes ................................................................................... 1-4
1.4 Dimensions........................................................................................................ 1-5
2. Instruction ................................................................................................. 2-1
2.1 Selection of Installation Location ................................................................... 2-1
2.2 MachiningofProbeInlet .................................................................................. 2-4
2.3 Installing the DT450G ....................................................................................... 2-6
3. PipingandWiring ..................................................................................... 3-1
3.1 ConnectingthePipeforAirPurge .................................................................. 3-2
3.2 ConnectingtheWiresforthePowerSupply.................................................. 3-3
3.3 Connection of Wires for the Output Signals.................................................. 3-4
3.4 Grounding the Duct .......................................................................................... 3-5
4. Operation................................................................................................... 4-1
4.1 Components and Their Functions .................................................................. 4-1
4.2 PreparationforOperation ................................................................................ 4-2
4.2.1 Inspection of the State of Installation ................................................. 4-2
4.2.2 Supply of Purge Air ............................................................................ 4-2
4.2.3 Supply of Power ................................................................................. 4-2
4.2.4 Setting of Parameters ........................................................................ 4-3
4.3 Steady-state Operation .................................................................................... 4-6
4.3.1 Examining the Operating Condition................................................... 4-6
4.3.2 Shutdown ........................................................................................... 4-6
4.3.3 Restart................................................................................................ 4-6
5. Inspection and Maintenance................................................................... 5-1
5.1 PeriodicMaintenance....................................................................................... 5-2
5.1.1 Cleaning the Sensor Probe................................................................ 5-2
5.1.2 Correcting (Resetting) the Measurement Range .............................. 5-2

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IM 11K01C01-01E
<CONTENTS>
5.2 ReplacingParts................................................................................................. 5-2
6. Troubleshooting ....................................................................................... 6-1
CustomerMaintenancePartsList........................................CMPL11K01C01-01E
Revision Information ...............................................................................................i

<1.Overview> 1-1
IM 11K01C01-01E
1. Overview
This chapter discusses the following topics.
· Product overview
· Specications
· Model and su󰀩x code
· Dimensions
1.1 ProductOverview
Powder is used in many industries including ceramics, cement, chemicals, pharmaceutical and
food. In their processes, powder is collected in order to reduce the loss incurred in the process.
Dust emissions from industrial plants are limited by the air pollution control law, local regulations
or other guidelines. Each industrial facility is required to be maintained so that its dust emissions
do not exceed the allowable level.
Air pollution control systems such as bag lters and electrostatic precipitators are used to
separate particulate or dust from the gas stream before it is exhausted into the atmosphere. To
maintain the dust concentration of the emission gas below the specied level through e󰀨ective
operation of the control system, it is essential to continuously monitor the dust concentration of
the exhaust gas.
Based on installation and application experiences with the existing DT400G model, the
microprocessor-based DT450G Dust Monitor features improved operationality and reliability.
Features include one-touch automatic range setup in response to process conditions and
automatic drift compensation. Also, the DT450G can measure at a process temperature of up to
250ºC, allowing it to cover a wide range of applications.
l MeasuringPrinciple
When two solid particles come into contact with each other, charge transfer takes place between
them. This charge transfer is known as the principle of triboelectrication or contact electrication
and the DT450G utilizes this principle. More specically, charge transfer occurs when particles in
a gas stream collide with (or pass nearby) the sensor probe, producing an electric current. The
DT450G amplies this current to convert it into its output current. The electric current produced
by frictional electricity is subject to the e󰀨ects of the following factors:
• Amount of the particles' electrostatic charge and a change in the polarity
• Particle size
• Velocity of particles
• Components of particles
The behaviors of these factors vary widely depending on the object of measurement and their
e󰀨ects are in no way uniform. In the case of xed-position measurement in a particular plant
however, measurement conditions, such as the components of particles, are almost constant
and therefore the e󰀨ects are usually marginal. Dust concentration is also constant in the case of
gases emitted from a bag lter, cyclone or electrostatic dust collector.
A current-mode input signal obtained at the detector block is transferred to the converter block,
where the signal is converted to a 4-20 mA DC analog output signal. The converter block outputs
an alarm contact signal at a desired level, in addition to the analog output signal.

<1. Overview>
1-2
IM 11K01C01-01E
1.2 Specications
Measurement objects: Solid particles in gas
Particle size : 0.3 µm or greater
Measurement range: 0.1 mg/m3to 1 kg/m3
Measurement principle: Inductive Electrication
Process conditions :
Temperature : 250ºC or less
Pressure : 200 kPa or less
Gas ow rate : 4 m/s or greater (approx. 30 m/s max)
Humidity : 40%RH or less
Input surge voltage : 100 V or less (if 500 V or greater, converter may be damaged.)
Note : When installing downstream of ESP, see Item 2.1.
Measurement range:
Range setup : One-touch automatic setup or manual setup (Measurement
range does not directly represent dust concentration.To know the
absolute value of dust concentration, the relationship between
the output signal and the dust concentration should be obtained
by laboratory analysis or relevant way.)
Note : With one-touch automatic setup function, measurement range is set so that the dust concentra tion of the process
corresponds to a setpoint of setting level. In manual setup, the measurement range is set by gain (x1, x10, x100,
x1000, x10000).
Setup range level : Variable (10 to 50%, 10% step)
Analog output signal : 4-20 mA DC, insulated, load resistance; 500 V
Contact output signal (high/low alarm):
Contact capacity : 5 A, 240 V AC or 24 V DC
Setting range : 1 to 99% (1% step) of measurement span
Contact type: NO (closed when alarm contact is activated) or NC, 2 outputs
Note : Relay is energized when alarm contact is activated.
Damping time constant : 10 to 300 seconds, 10 second step
Relay output time constant : 10 to 180 seconds, 10 second step
Ambient conditions:
Temperature : -20 to 45ºC
Humidity : 95%RH or less (non-condensing)
Vibration : 5 m/s2 (0.5 G) or less
Construction:
Converter : Integrated with detector, protection rating IP 64
Sensor probe : Direct insertion
Materials:
Sensor probe : Stains steel (316 SS)
Insulation of sensor: PEEK
Case : Aluminum
Flange : Stainless steel (304 SS (JIS) or ASTM grade 304)
Finish : Polyester resin coated
Colors:
Case : Silver gray (Munsell 3.2PB 7.4/1.2)
Cover : Mint green (Munsell 5.6PG 3.3/2.9)
Power supply:
Rating : 100 to 120 VAC, 200 to 240 VAC
Operating voltage range : 90 to 132 VAC, 180 to 264 VAC
Power consumption : 8 VA
Wiring connection : 2 ports
• DIN with PG11 cable gland (applicable to cable with 5 to 10 mm OD) for power wiring
• DIN with PG11 cable gland (applicable to cable with 5 to 10 mm OD) for output wiring
Note: Use one cable for analog output and contact signals.

<1.Overview> 1-3
IM 11K01C01-01E
Air purge:
Connection : Rc1/4
Air source : Clean, dry air equivalent to instrument air at process pressure
+50 kPa
Air consumption : approx. 50 Nl/min
Mounting : Socket (dedicated) or ange
Weight : Approx. 2.3 kg (excluding ange)
Dimensions : 172 (W) x 173 (H) x 672 (D) mm

<1. Overview>
1-4
IM 11K01C01-01E
1.3 ModelandSu󰀩xCodes
Model Su󰀩xCode Option
Code Description
DT450G - - - - - - - - - - - - - - - - - - - - - - - - - - Dust monitor (heat resistant up to 250ºC
Analog output -5 - - - - - - - - 4-20 mA DC analog output + ne adjustment for
measuring range
Power supply -2
-5
- - - - - - - -
- - - - - - - -
200-240 V AC, 50/60 Hz
100-120 V AC, 50/60 Hz
Probe length -05 - - - - - - - - 460 mm
Sensor material -1 - - - - - - - - 316 SS
Air purge -A - - - - - - - - With air purge
Instruction Manual -J
-E
- - - - - - - -
- - - - - - - -
Japanese
English
Mounting -W
-A
-K
-M
-P
-T
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
Socket mounting (welding socket)
Flange mounting (ANSI Class 150 2 1/2 RF)
Flange mounting (JIS 5K 65 FF)
Flange mounting (JIS 10K 80 FF)
Flange mounting (JIS 10K 100 FF)
Flange mounting (JPI Class 150 2 1/2 RF)
—-A - - - - - - - - Always -A
Option /TC Probe: Teon coated
Note: Teon coated probe (option code “/TC”) is recommended to prevent the insu󰀩cient insulation by dust and moisture deposited on
sensor probe.
Teon coated probe is designed to operate at a temperature not exceeding approximately 150ºC.
l SpareParts
Item PartNumber Qty
O-ring
Flange assembly:
JIS 5K 65 FF
JIS 10K 80 FF
JIS 10K 100 FF
JPI Class 150 2 1/2 RF
ANSI Class 150 2 1/2 RF
Socket
Bolt
B1026ER
K9479DA
K9479DB
K9479DC
K9479DE
K9479DD
K9479CA
L9800TC
1
1
1
1
1
1
1
2

<1.Overview> 1-5
IM 11K01C01-01E
1.4 Dimensions
l WeldingSocketMountedModel
93 579
67
172
173
472
127
Max.20
Ø10
30
(Ø5 to Ø10)
(Ø5 to Ø10)
Output Signal Cable Inlet Power Cable Inlet
(Air Purge Piping Connection)
Rc1/4
Unit: mm
Welding socket
Ø13
277
250
Teflon coated
(Option : /TC)
Welding socket type.ai
2-Ø9
90°
59.5
A
A
10 30.5
Ø37.7Ø34
A-A Section
Welding Socket (accessory) of
Stainless Steel (316L SS).
Ø38.2 cutout
40
Max. 15
Locate the cutout for
tubing at the bottom
Socket
Duct wall
Weld all around the socket;
be careful not to deform
the socket.
Welding of Socket
(Cutout for
tubing)
(air purge tubing)
Welding Socket.ai
15 0
-0.1
Dimensions of DT450G Dust Monitor (Flange Mounted Model)

<1. Overview>
1-6
IM 11K01C01-01E
lFlange Mounted Model
4-Øh
t460
(Insertion Length)
93 579
Max.20
30
127
173
172
30
146.5
ØD
67
Class
Rc1/4
(Air Purge Piping Connection)
Power Cable inlet
Output Signal Cable Inlet (Ø5 to Ø10)
Unit: mm
Flange type.ai
Flange Dimensions Unit: mm
175210 18
18
19
19
150185
22.5
22.4
19
19.1
178 139.7
139.7177.8
1415
130155
JPI Class 150 2 1/2 RF
ANSI Class 150 2 1/2RF
JIS 10K 100 FF
JIS 10K 80 FF
JIS 5K 65 FF
t
h
CD g
4
8
8
4
4
Ø10
Ø13
265
250
Teflon coated
(Option : /TC)
Ø
D
Ø
C
g- Ø h
JIS 10K 80 FF (Example)
JIS 5K 65 FF (Example)
(Ø5 to Ø10)
DimensionsofDT450GDustMonitor(WeldingSocketMountedModel)

<2. Instruction>2-1
IM 11K01C01E
2. Instruction
The DT450G is designed for indoor installation or installation in an outdoor location free from
splashes of rainwater and direct sunlight.
This chapter explains how to install the DT450G in the following order of topics.
•Selection of installation location
• Machining of inlet for sensor probe
•Installation of DT450G
2.1 Selection of Installation Location
The DT450G is designed for mounting on a duct with a width of 650 to 4000 mm (when the
standard probe length is 460 mm) or other alternative locations. Install the DT450G in a location
where optimal measurement can be carried out and inspection and maintenance is easy.
When selecting an installation location, make sure it also satises the measuring and ambient
environmental conditions described in Section 1.2. In addition, the installation location must meet
the following requirements.
nAvailability of Typical Dust Concentration
The most suitable location along a duct is where there is no owmeter or valve that may disturb
the gas ow and where the duct is straight and the length is adequate in comparison with the
inside width of the duct. (Ideally, the straight portion should be no less than eight times the length
of the width. Locate the probe inlet in a position 3/8 the length of the straight portion from the
downstream edge and 5/8 the length from the upstream edge.)
Note: Insert the sensor probe into the inlet so that it is perpendicular to the stream of gas.
The DT450G can be positioned in such a manner that its sensor probe is level or facing downward at an angle up to 90º.
Downstream
d ( ≥ 650 mm)
L ≥ 8d is recommended
Upstream
3
8
5
8
Duct
Dust monitor
Install at the center of the duct and
perpendicular to the gas flow. F0701.ai
Figure 2.1InstallationofDustMonitoronStraightPartofDuct
n NoNoiseE󰀨ects
Make sure the output signal will not be a󰀨ected by noise arising from plant equipment or other
structures. In an electrostatic dust collector is used, locate the DT450G at least 20 m away from
the dust collector. When monitoring such dust collectors as a bug lter, locate the DT450G in the
upstream of the blower.

<2. Instruction>
2-2
IM 11K01C01-01E
nMinimal Vibration
For reasons of sensor structure, avoid installing the DT450G in a location exposed to mechanical
vibration at a level greater than 5 m/s2.
Note: It is virtually impossible for vibration to a󰀨ect the measured value.
lNo Splashes of Rainwater, Direct Sunlight or Abnormal Temperature Rises due
to Heat Radiation from Equipment
The DT450G may be installed outdoors. However, avoid installing the monitor in a location
exposed to direct sunlight or heat radiated from equipment, in order to prevent the temperature of
the main unit’s casing from rising above 45ºC.
Note: The DT450G can be operated within an ambient temperature range of –20ºC to 45ºC.
If the part of the duct assigned for the probe inlet is covered with insulating material that is likely
to contribute to a temperature rise in the casing, remove the insulating material around the probe
inlet in an area approximately 20 cm wide across the inlet.
400 mm
(Area of insulating
material to be removed)
Probe inlet
Insulating
materia
Insulating material
DT450G
Example of acceptable mounting
The temperature rise is minimal
because of air ventilation.
Example of unacceptable mounting
The DT450G is affected by heat
radiation from the insulating material.
F0202.ai
DT450G
Figure2.2 MeasurestoTakeWhentheTemperatureoftheDT450G’sCasingIsLikelytoRisedue
to Insulating Material

<2. Instruction>2-3
IM 11K01C01E
nEase of Inspection and Maintenance
The DT450G dust monitor must be detached for cleaning the sensor probe. For safe operation
of these maintenance works, a su󰀩cient maintenance space as shown below is required (See
Figure 2.3).
≥ 1 m
≥ 1 m
≥ 1 m
Maintenance
space
0.5 m
0.5 m
Duct
F0703.ai
Figure 2.3 Maintenance Space at Installation Location of DT450G Dust Monitor

<2. Instruction>
2-4
IM 11K01C01-01E
2.2 MachiningofProbeInlet
The DT450G is designed for mounting on a socket or ange attached to an inlet on a duct
or other alternative facility. Equip the inlet with a socket or ange that complies with the
specications of the DT450G. At this point, make sure the DT450G’s casing and the duct are in
electrical continuity.
l WhenMountingtoSocket
Use the socket that comes with the DT450G for installation. Weld this socket paying attention to
the following precautions.
• The standard insertion length of the sensor probe is 460 mm.
• For welding the socket, cut out a 38.0 mm diameter hole on the duct or pipe. (The socket’s
outer diameter is 37.7 mm.)
• Weld all around the socket (316L SS). Make sure there are no spots not welded. Be careful
not to deform the socket while welding. Be careful about the orientation of the socket. When
installing the dust monitor on a vertical plane, place the cutout for air tubing at the bottom.
Unit: mm
ر38.0 ±0.1
hole
Duct Cutout for Socket
Duct wall
(socket welding plane)
Weld all around
(Be careful not to deform the socket.)
Socket (accessory)
Place the cutout for air purge tubing at the bottom F070202.ai
Figure2.4 ConnectionPortforSocketMountingModel

<2. Instruction>2-5
IM 11K01C01E
l WhenMountingtoSocket
Prepare the DT450G with a ange that meets the specied standard. Prepare the tie-in ange
at the connection port of the duct or pipe. Note that the standard sensor probe insertion length is
460 mm on the ange specication.
Inner dia. 38 mm
Flange Duct
F070201.ai
Figure2.5 ConnectionPortforFlangeMountedModel
A drop of water on the insulated part of the sensor probe will prevent correct measurement.
If the process gas is cooled down around the sensor connection port when measuring high-
temperature and high-humidity gas, be sure to purge the air in order to prevent condensation
at the neck of the sensor connection ange. If there is a possibility of the ambient temperature
decreasing to 0ºC or less, provide thermal insulation at the neck of the connection ange.
DT450G
Cable
Tubing for air purge
Duct
Mounting
screw
Provide thermal
insulation here.
F0702012.ai
(Note)
Note: The DT450G body can be detached
by removing the mounting screw.
Figure2.6 ThermalInstallationforPreventingCondensation