Yokogawa DM8C User Manual

User’s Manual

Model DM8 Vibration Type Density Meter

IM 12T03A01-02E

3rd Edition

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 INTRODUCTION

This manual describes the speciﬁ cations, installation, operation, maintenance, and trouble- shooting for the Model DM8 Vibration Type Density Meter. To use this manual correctly, read this manual thoroughly.

For the Model VD6SM Sampling System, refer to IM 12T3S1-01E.

IM 12T03A01-02E

 For the safe use of this equipment

Safety, Protection, and Modiﬁ



• In order to protect the system controlled by the product and the product itself and ensure safe operation, observe the safety precautions described in this user’s manual. We assume no liability for safety if users fail to observe these instructions when operating the product.

• If this instrument is used in a manner not speciﬁ ed in this user’s manual, the protection provided by this instrument may be impaired.

• Be sure to use the spare parts approved by Yokogawa Electric Corporation (hereafter simply referred to as YOKOGAWA) when replacing parts or consumables.

• Modiﬁ cation of the product is strictly prohibited.

• The following symbols are used in the product and user’s manual to indicate that there are precautions for safety:

Notes on Handling User’s Manuals



• Please hand over the user’s manuals to your end users so that they can keep the user’s manuals on hand for convenient reference.

• Please read the information thoroughly before using the product.

• The purpose of these user’s manuals is not to warrant that the product is well suited to any particular purpose but rather to describe the functional details of the product.

cation of the Product

• No part of the user’s manuals may be transferred or reproduced without prior written consent from YOKOGAWA.

• YOKOGAWA reserves the right to make improvements in the user’s manuals and product at any time, without notice or obligation.

• If you have any questions, or you find mistakes or omissions in the user’s manuals, please contact our sales representative or your local distributor.

Warning and Disclaimer



The product is provided on an “as is” basis. YOKOGAWA shall have neither liability nor responsibility to any person or entity with respect to any direct or indirect loss or damage arising from using the product or any defect of the product that YOKOGAWA can not predict in advance.

IM 12T03A01-02E

Symbol Marks



Throughout this user’s manual, you will ﬁ nd several different types of symbols are used to identify dif- ferent sections of text. This section describes these icons.

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe practices.

IMPORTANT

iii

Indicates that operating the hardware or software in this manner may damage it or lead to system failure.

NOTE

Draws attention to information essential for understanding the operation and features.

Tip

This symbol gives information that complements the current topic.

 After-sales Warranty

 Do not modify the product.

 During the warranty period, for repair under warranty consult the local sales

representative or service ofﬁ parts. Before consulting 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.

 If we replace the product with a new one, we won’t provide you with a repair report.

 Yokogawa warrants the product for the period stated in the pre-purchase quotation Yokogawa

shall conduct deﬁ 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.

 In the following cases, customer will be charged repair fee regardless of war-

ranty period.

ce. Yokogawa will replace or repair any damaged

• 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 insufﬁ cient maintenance by user.

• Failure due to modiﬁ cation, misuse or outside-of-speciﬁ cations operation which Yokogawa does not authorize.

• Failure due to power supply (voltage, frequency) being outside speciﬁ cations or abnormal.

• Failure caused by any usage out of scope of recommended usage.

• Any damage from ﬁ re, earthquake, storms and ﬂ oods, lightning, disturbances, riots, warfare, radiation and other natural changes.

 Yokogawa does not warrant conformance with the speciﬁ c application at the

user site. Yokogawa will not bear direct/indirect responsibility for damage due to a speciﬁ c application.

 Yokogawa Electric will not bear responsibility when the user conﬁ gures the

product into systems or resells the product.

 Maintenance service and supplying repair parts will be covered for ﬁ ve years

after the production ends. For repair for this product, please contact the nearest sales ofﬁ ce described in this instruction manual.

IM 12T03A01-02E

Model DM8 Vibration Type Density Meter

IM 12T03A01-02E 3rd Edition

CONTENTS

 INTRODUCTION ...................................................................................................i

 For the safe use of this equipment ...................................................................ii

 After-sales Warranty ..........................................................................................iv

1. GENERAL .................................................................................................. 1-1

1.1 Standard Speciﬁ cations ...................................................................................1-1

1.1.1 General Speciﬁ cations ....................................................................... 1-1

1.1.2 Detector ..............................................................................................1-2

1.1.3 Converter Model DM8C ..................................................................... 1-3

1.1.4 Special Cable Model DM8W .............................................................. 1-5

1.1.5 Standard Accessories ........................................................................ 1-5

1.2 Models and Sufﬁ x Codes .................................................................................1-6

1.2.1 General Purpose Detector ................................................................. 1-6

1.2.2 Flameproof Detector .......................................................................... 1-6

1.2.3 Sanitary Use Detector ........................................................................ 1-6

1.2.4 Converter ...........................................................................................1-6

1.2.5 Special Cable ..................................................................................... 1-6

1.3 External Dimensions ........................................................................................ 1-7

1.3.1 Detector ..............................................................................................1-7

1.3.2 Converter Model DM8C ..................................................................... 1-9

1.3.3 Special Cable Model DM8W ............................................................1-10

1.4 Cautions in Handling Flameproof, Explosionproof Instruments .............. 1-11

1.4.1 Outline of Explosionproof Instruments ............................................. 1-11

1.4.2 Labeling the Explosionproof Speciﬁ cations ..................................... 1-11

1.4.3 Installation Area and Ambient Conditions ........................................1-12

1.4.4 External Wiring Work ....................................................................... 1-12

1.4.5 Maintenance Procedure .................................................................. 1-12

1.4.6 Repairs ............................................................................................. 1-12

2. PRINCIPLES OF OPERATION ................................................................. 2-1

2.1 Measuring Principle .......................................................................................... 2-1

2.1.1 Density Detector ................................................................................ 2-1

2.1.2 Density Converter .............................................................................. 2-2

2.2 Main Components ............................................................................................. 2-3

2.2.1 Density Detector ................................................................................ 2-3

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2.2.2 Density Converter .............................................................................. 2-4

3. INSTALLATION, PIPING AND WIRING .................................................... 3-1

3.1 Installation of Density Detector ....................................................................... 3-1

3.1.1 Mounting Density Detector ................................................................ 3-1

3.1.2 Sampling Unit for Vibration Type Density Meter ................................ 3-2

3.2 Installation of Density Converter .................................................................... 3-6

3.2.1 Installation Area.................................................................................. 3-6

3.2.2 Installation of Density Converter ........................................................ 3-6

3.3 Piping ............................................................................................................... 3-10

3.3.1 Sample Liquid Conduit .....................................................................3-10

3.3.2 Air Piping for Maintenance ............................................................... 3-11

3.3.3 Steam Piping .................................................................................... 3-11

3.3.4 Piping for Air Purge .......................................................................... 3-12

3.4 Wiring ............................................................................................................... 3-13

3.4.1 Wiring between Detector and Converter .........................................3-14

3.4.2 Wiring for Analog Output Signal ....................................................... 3-16

3.4.3 Wiring for Digital Output Signal ........................................................ 3-16

3.4.4 Wiring for Abnormal Status Contact Output ..................................... 3-16

3.4.5 Wiring for Power Supply ..................................................................3-16

3.4.6 Wiring for Grounding ........................................................................ 3-16

4. OPERATION .............................................................................................. 4-1

4.1 Component Names and Function ................................................................... 4-1

4.1.1 Density Detector ................................................................................ 4-1

4.1.2 Density Converter .............................................................................. 4-2

4.2 Operation ........................................................................................................... 4-3

4.2.1 Operation Mode ................................................................................. 4-3

4.3 Preparation for Measurement .......................................................................... 4-7

4.3.1 Check for Piping ................................................................................. 4-7

4.3.2 Check for Wiring................................................................................. 4-7

4.3.3 Measuring Liquid Flow ....................................................................... 4-7

4.3.4 Turning ON the Power ....................................................................... 4-8

4.3.5 Data Input ........................................................................................... 4-8

4.3.6 Pressure Compensation .................................................................... 4-9

4.4 Calibration ......................................................................................................... 4-9

4.4.1 Calibration with Standard Solution .................................................. 4-10

4.4.2 Calibration with a Sample ................................................................ 4-11

4.4.3 Calibration Error ............................................................................... 4-11

4.5 Operation ......................................................................................................... 4-12

4.5.1 Operation Procedure ....................................................................... 4-12

4.5.2 Check of Measured Density Value................................................... 4-12

4.5.3 Shutdown ......................................................................................... 4-12

5. MAINTENANCE ......................................................................................... 5-1

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5.1 Daily Inspection/Maintenance ......................................................................... 5-1

5.1.1 Cleaning the Vibrator in the Detector ................................................. 5-1

5.1.2 Exchange of Desiccant in the Detector ............................................. 5-1

5.2 Troubleshooting ................................................................................................ 5-2

5.2.1 Checking the Vibrators .......................................................................5-2

5.2.2 Checking the RTD ..............................................................................5-2

5.2.3 Checking the Oscillation Ampliﬁ er .....................................................5-2

Customer Maintenance Parts List .......................................... CMPL 12T3E1-01E

Customer Maintenance Parts List .......................................... CMPL 12T3H1-01E

Revision Information ...............................................................................................i

vii

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< 1. GENERAL >

1. GENERAL

Density is one of the fundamental physical quantities required when the property or composition of a liquid sample is being determined in industrial processes. Especially, density measurement of a sample liquid is indispensable in many industries such as electric manufactures, chemical industries, oil reﬁ neries and food-related applications.

The Model DM8 Vibration Type Density Meter is a higher reliable meter full of operation and maintenance functions. The meter consists of a detector and a converter. The detector has a vibrator and an RTD (resistance temperature detector), and outputs detected density signal (frequency) and temperature signal (voltage) to the converter. The converter is equipped with a microprocessor to convert the frequency signals from the detector into density values and display them. It also calculates the density at the reference temperature according to these signals and digitally displays them. Moreover, the converter outputs digital transmission signals besides analog transmission signals and is further provided with a variety of functions such as one-touch calibration, selfdiagnosis.

1.1 Standard Speciﬁ cations

1.1.1 General Speciﬁ cations

Measurement object: Liquid density

Measurement principle: Vibration density measurement

Measurement range:

Density: 0.5 to 2.0 g/cm

Temperature: –10 to 100 °C

Distance between Detector and Converter: Up to 2 km

Power supply: 90 to 132 V AC or 180 to 264 V AC, 50/60 Hz

Power consumption: 20 VA

1-1

Characteristics

(overall characteristics after combing the detector and the converter)

Repeatability: 5 x10

1 % of span (for analog output)

Linearity: ±0.5 % of span (when span is 0.2 g/cm

±1 % of span (when span is more than 0.2 g/cm

Temperature characteristics: ±0.5 % of span/±10 °C (Compensating error for changes in the measuring liquid temperature and detector temperature)

Flow characteristics: ±0.1 % of span in the range of 0 to 5 l/min

Pressure characteristics: ±0.0005 g/cm

Viscosity error: ±0.1 % of span in the range of 0 to 1500 cP

–4

g/cm3 (for digital output)

/±98 kPa change

or less)

)

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1-2

< 1. GENERAL >

1.1.2 Detector

(1) General Purpose Detector Model VD6D

Detector construction: Non-explosion protection, rain-proof construction

Case material: Cast Aluminum alloy

Case coating: Epoxy resin, baked ﬁ nish

Case color: Jade green (equivalent to Munsell 7.5BG4/1.5)

Wetted part materials:

Base: SUS316

Vibrator: SUS316 or Ni (Au Brazing: BAu·4)

Measuring liquid temperature: –10 to 100 °C

Measuring liquid pressure: 2 MPa G or less

Maximum pressure: 4.9 MPa G

Steam tracing: Available

Process connection: Rc1/4

Electrical connection: G3/4

Mounting: 2-inch. pipe mounting

Ambient temperature: –10 to 50 °C

Weight: Approx. 12 kg

(2) Flameproof (Explosionproof) Detector Model VD6DF

Detector construction: TIIS; d2G3 or FM; Class I, Division 1, Groups C and D, Flameproof construction

Process connection: Rc1/4 or 1/4NPT female (only for VD6DF-*B/FM)

Electrical connection: G3/4 or 3/4NPSM female (only for VD6DF-*B/FM)

Speciﬁ cations are the same as for the (1) General Purpose Detector except for the above construction.

(3) Sanitary Use Detector Model VD6DS

Process connection: Special joint for connection to JIS 6A (6 mm dia.) pipe (within gasket)

Wetted part materials: Added to the standard model

Gasket: Teﬂ on

O-Ring: Viton

Stream tracing: Not available

Speciﬁ cations are the same as for the (1) General Purpose Detector except for the above two items.

Temperature detector protecting tubes are detachable.

Note: These detectors cannot be used with highly corrosive liquids and solutions likely to stick

to sensors. If it is desired to be applied to solutions containing slurry or sludge, consult with YOKOGAWA. For measuring NaOH solutions, use sensors with a nickel vibrator.

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< 1. GENERAL >

1.1.3 Converter Model DM8C

Display: Digital display, ﬁ ve digits LED

Display contents:

Density (g/cm

Measuring liquid temperature (°C)

Set density value for the calibration liquid (g/cm

Temperature coefﬁ cient set value for the calibration liquid (x10

Output signal set value (%) (displayed on call)

Setting for output range low limit (g/cm

Setting for output range high limit (g/cm

Reference temperature (center temperature) set value (°C) (displayed on call)

Temperature coefﬁ cient set value for the measuring liquid (x10

Fault contents display

Output signal: Analog output: 4 to 20 mA DC (load resistance 550 Ω or less), and 0 to 1 V DC (load

resistance 250 kΩ or more), isolated output.

Density (g/cm

Digital output: RS-232-C

(1) Communication speciﬁ cations

) after conversion to reference temperature (center temperature)

) at the measuring temperature

) (displayed on call)

–5

g/cm3/°C) (displayed on call)

) (displayed on call)

–5

g/cm3/°C) (displayed on call)

) after conversion to the reference temperature

1-3

• Asynchronous system

Start bit; 1 bit, Stop bit; 2 bit, Parity; none

• Baud rate; 1200 bps

• Data format; ASCII, Data length; 8 bit

• Wiring system; Two-wire system (output only)

(2) Output signal

• Transmitting contents

Measured data; Density (g/cm

) after conversion to the reference temperature, density (g/cm3) at

the measured temperature, measured liquid temperature (°C)

Calibration state; calibration start, error No., calibration end

Failure alarm; error No.

• Signal level

Output voltage; ON; 9 ±3 V, OFF; -9 ±3 V Output impedance; 300 Ω

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1-4

< 1. GENERAL >

• Output format

Measured data

# * . * * * * _ * . * * * * _ * * * . * C

Calibration status

space space

(Note) Data are output in the order of density (data converted into that at a reference

temperature), density (at measuring temperature), and measuring liquid temperature. Hold data (data immediately before entering the mode) is output during the time of calibration or maintenance mode. However, holding is released immediately after calibration or maintenance mode.

# CALIBRATION _ START C

(Note) Nothing is output during calibration. However, when a parameter error occurs, output

becomes as follows.

# CALIBRATION _ END C

Fail alarm

# ERROR - * _ ERROR - * C

(Note) When multiple errors occur, each error No. for the respective errors is output.

space

# ERROR - *C

space

RLF

(*: 5 or 6)

RLF

Example: # ERROR - 1 _ ERROR - 3 C

space

RLF

Output signal span: 0.05 to 0.5 g/cm3 settable

Reference temperature set range: 0 to 100 °C (in increments or decrements of 1 °C)

Contact output on failure: One point. Contact closed on failure or power failure. Contact open when normal.

Permissible voltage: 220 V DC, 250 V AC

Permissible current: 2A (resistive load)

Permissible contact power: 60 W

Fault detecting contents: Detector failure and converter failure

Failure output:

Analog signal: Falls down to about –10 % of the output signal span

Digital signal: Error message outputs

Output signal hold: Holds in the CAL. or Maintenance mode.

Settable range for temperature coefﬁ cient: 0 to 0.002 g/cm

/°C

Calibration procedure: One-touch calibration by strong calibration liquid density (onepoint calibration)

Ambient temperature: –10 to 55 °C

Power supply: 90 to 132 V AC or 180 to 264 V AC, 50/60 Hz

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< 1. GENERAL >

Case construction: Dust and rain proof construction

Coating color: Door: Equivalent to Munsell 2.8GY6.4/0.9

Case: Equivalent to Munsell 2.0GY3.1/0.5

Coating ﬁ nish: Baked ﬁ nish epoxy resin

Mounting: To panel, wall or 2-inch pipe

Air purge connector: Rc1/8, Rc1/4, or 1/4NPT female is also optionally available

Electrical connection: Five holes, 27 mm dia.

Attached with four plastic waterproof plugs equivalent to JIS A15, and one plastic waterproof plug equivalent to JIS A20.

Weight: Approx. 7.5 kg

1.1.4 Special Cable Model DM8W

Type: Six-conductor double shield cable

Insulator: Polyethylene

Sheath: Polyvinyl chloride Insulation resistance: 1000 MΩ/km Conductor resistance: 15.31 Ω/km

Finished O.D.: 15.8 mm

Weight: Approx. 0.3 kg/m

1-5

1.1.5 Standard Accessories

Syringe (for injecting standard solution or solvenet)

Brush (for cleaning the detector) 1 pcs

Allen wrench for terminal box 1 pcs

Allen wrench for locking the cover 1 pcs

O-Ring 1 bag

Silica gel 2 packs

Fuse for the converter (3A) 1 pcs for Converter (DM8C)

1 pcs

for Detector (VD6)

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1-6

< 1. GENERAL >

1.2 Models and Sufﬁ x Codes

1.2.1 General Purpose Detector

Model Sufﬁ x Code Option Code Description

VD6D ••••••••••••••••••••• •••••••••••••••••• General purpose detector

Vibrator material -S3

-N1

— *B •••••••••••••••••• Style B

1.2.2 Flameproof Detector

Model Sufﬁ x Code Option Code Description

VD6DF ••••••••••••••••••••• •••••••••••••••••• Flameproof detector

Vibrator material -S3

-N1

— *B •••••••••••••••••• Style B

(Option) /FM NEC Class I,Division 1,Group C and D,

••••••••••••••••••

SUS316 Ni

explosionproof

1.2.3 Sanitary Use Detector

Model Sufﬁ x Code Option Code Description

VD6DS ••••••••••••••••••••• •••••••••••••••••• Sanitary use detector

Vibrator material -S3 •••••••••••••••••• SUS316

— *B •••••••••••••••••• Style B

1.2.4 Converter

Model Sufﬁ x Code Option Code Description

DM8C ••••••••••••••••••••• •••••••••••••••••• Converter

Power supply -A1

— *C •••••••••••••••••• Style C

(Option) Air purge connector

-A2

1.2.5 Special Cable

Model Sufﬁ x Code Option Code Description

DM8W ••••••••••••••••••••• •••••••••••••••••• Special cable

Cable length

— *A •••••••••••••••••• Style A

-L

••••••••••••••••••

/AP1 /AP2

•••••••••••••••••• Length (unit: m)

90 to 132V AC, 50/60Hz 180 to 264V AC, 50/60Hz

Rc1/4 1/4NPT female

(Note) Enter the cable length in “-L in m.” [Example] L0050 for 50 m L0100 for 100 m L2000 for 2 km

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< 1. GENERAL >

1.3 External Dimensions

1.3.1 Detector

General Purpose and Flameproof Detector Models VD6D and VD6DF

246

100

153

104

ø110

192

1-7

Unit : mm

Sample lnlet Rc1/4

342

200

100

ø160

Steam Connection Rc1/4

Steam Outlet Rc1/4

2-inch Pipe

(Horizontal or Vertical)

Electrical Wiring Port G3/4

146

ø116

ø74

For VD6DF-*B/FM *1: 1/4NPT *2: 3/4NPSM

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1-8

< 1. GENERAL >

Sanitary Use Detector Model VD6DS

246

100

Unit : mm

153

104

ø110

192

Gland

Sample lnlet *

103

345

200

166

ø160

Sample Output *

146

ø116 ø74

2-inch Pipe

(Horizontal or Vertical)

Electrical Wiring Port

G3/4

* The ends of sample inlet and outlet are connected with 1/8-inch pipe in welding. The pipe may be removed by loosing the gland.

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< 1. GENERAL >

1.3.2 Converter Model DM8C

1-9

Wiring port holes (5-ø27) (with rubber plugs)

Purge air outlet (with seal sheet)

Mounting pipe (2-inch pipe)

183

240

288

200

34 34 34 34

*: When option code is specified, Rc1/4 or 1/4 NPT female connector is attached.

Mounting bracket (applicable with any mounting method to panels, walls or pipes)

Mounting panel thickness Max. 12

31 35 23

Purge air inlet Rc1/8 *

Pipe mounting bracket

138

116

272

Unit: mm

Panel cutout dimensions

212±1 222

Wall mounting hole drilling dimensions

2-ø9 holes or M8 screws

275±1

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1-10

< 1. GENERAL >

1.3.3 Special Cable Model DM8W

Unit : mm

Density detector

130(from A)

WHITE

GRAY

RED

BLUE

YELLOW

GREEN

BROWN

(Note) Cable length is specified by the suffix code of “-L”,  is specified in meter. e.g. for 50 m, -L0050 for 100 m, -L0100 for 2 km, -L2000

60(from A)

110(from A)

(from A)

110(from A)

60(from A)

Specified length by “-L” (Note)

ø15.8

(from B)100

Density converter

(from B)

120

(from B)

(from B)100

B4 WHITE

GRAY

110

(from B)90

(from B)80

A2 RED

A3 BLUE

YELLOW

GREEN

A6 BROWN

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