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<4. OPERATION>

4-9

IM 12T03A01-02E

4.3.6

Pressure Compensation

Pressure compensation means to compensate the shift generated by measurement under

operating pressure. The compensation should be carried out as necessary only for calibration

under atmospheric pressure.
Measured value is affected up to +0.00005 g/cm

3

by 100 kPa pressure variance.

Therefore, for liquid under pressure approximating to the atmospheric pressure calibrated

value under atmospheric pressure can be used. Pressure compensation is to be carried out to

minimize effects generated by high operating pressure.

Compensation data is obtained by conducting sample liquid. Measure the data according to the

following procedure when the liquid density is stable. The procedure assumes that sample liquid

is already conducted according to Section 4.3.3.

(1) Fully open the needle valve “NV4” and read P from the pressure gauge. At the same time,

obtain density at the reference temperature indicated on the density converter.

(2) Fully close the ball valve “BV1”, and open the needle valve “NV3” to equalize the sample

liquid pressure in the detector to the atmospheric pressure. Obtain density at the reference

temperature indicated on the density converter.

(3) Calculate the compensation data using the densities obtained in (1) and (2).

Compensation data (g/cm

3

) =

Density under working pressure – density under atmospheric pressure

When calibration the compensation data should be subtracted from the density value of the

standard solution.

STEAM IN

CONDENSATE OUT

V2

a

a

V1

b

ST1

a'

a'

b'

TI

F

FM

NV1

PI

NV2

DD

NV3

NV4

BV1

Element specifications

F:

Strainer body; 316 SS

Element; 316 SS, or Ni (option)

PI:  Pressure gauge, 0 to 1MPa or 0 to 2MPa, 316 SS
TI:  Thermometer. 0 to 100 °C or 0 to 150 °C, 316 SS
FM:  Flowmeter, tapered metal tube flowmeter, 1 to 10 L/min, 316 SS
BV1:   Ball valve, 316 SS
NV1 to 4: Needle valve, 316 SS
DD:    Density detector
V1, V2: Valve
ST1:   Steam trap

SAMPLE IN

SAMPLE OUT

Figure 4.5

Flow Diagram

5th Edition : Dec. 11, 2015-00

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Содержание vigilantplant DM8

Страница 1: ...User s Manual R Model DM8 Vibration Type Density Meter IM 12T03A01 02E IM 12T03A01 02E 5th Edition ...

Страница 2: ...or 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 No part of the user s manuals may be transferred or reproduced without prior written consent from YOKOGAWA YOKOGAWA reserves the right to m...

Страница 3: ...ollowing 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...

Страница 4: ... 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 insufficient maintenance by user Failure due to modification misuse or outside of specifications operation which Yokogawa does not authorize Failure due to power supply voltage frequency being outside specifications or...

Страница 5: ...Blank Page ...

Страница 6: ...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 Explosion proof Instruments 1 11 1 4 1 Outline of Explosion proof Instruments 1 11 1 4 2 Labeling the Explosion proof Specifications 1 11 1 4 3 Installation Area and Ambient Conditions 1 12 1 4 4 External Wir...

Страница 7: ...ital Output Signal 3 14 3 4 4 Wiring for Abnormal Status Contact Output 3 15 3 4 5 Wiring for Power Supply 3 15 3 4 6 Wiring for Grounding 3 15 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...

Страница 8: ...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 Amplifier 5 3 Customer Maintenance Parts List CMPL 12T3E1 01E Customer Maintenance Parts List CMPL 12T3H1 01E Revision Information i 5th Edition Dec 11 2015 00 ...

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Страница 10: ...urther provided with a variety of functions such as one touch calibration self diagnosis 1 1 Standard Specifications 1 1 1 General Specifications Measurement object Liquid density Measurement principle Vibration density measurement Measurement range Density 0 5 to 2 0 g cm3 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 ...

Страница 11: ...lable Specifications 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 wi...

Страница 12: ...utput impedance 300 Ω Output format Measured data space space _ _ CRLF 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 calibra...

Страница 13: ...mperature 10 to 55 C Power supply 90 to 132 V AC or 180 to 264 V AC 50 60 Hz Case construction Dust and rain proof construction EMC Korea Electromagnetic Conformity Standard Class A Coating color Door Equivalent to Munsell 2 8GY6 4 0 9 Case Equivalent to Munsell 2 0GY3 1 0 5 Coating finish Baked finish epoxy resin Mounting To panel wall or 2 inch pipe Air purge connector Rc1 8 Rc1 4 or 1 4NPT fema...

Страница 14: ...dels and Suffix Codes 1 2 1 General Purpose Detector Model Suffix Code Option Code Description VD6D General Purpose Liquid Density Detector Vibrator material S3 N1 316 SS Ni B Style B 1 2 2 Flameproof Detector Model Suffix Code Option Code Description VD6DF Flameproof Liquid Density Detector Vibrator material S3 N1 316 SS Ni B Style B Option FM NEC Class I Division 1 Group C and D explosion proof ...

Страница 15: ...tyle D Option Air purge connector AP1 AP2 KC Rc1 4 1 4NPT female for Korea 1 Be sure to select this if you want to use the converter in Korea 1 2 5 Special Cable Model Suffix Code Option Code Description DM8W Special Cable for Liquid Density Meter Cable length L Length unit m A Style A Note Enter the cable length in L in m Example L0050 for 50 m L0100 for 100 m L2000 for 2 km 5th Edition Dec 11 20...

Страница 16: ...roof Detector Models VD6D and VD6DF Unit mm 246 100 192 ø110 104 153 342 100 78 200 G3 4 2 58 ø160 146 ø116 ø74 Sample lnlet Rc1 4 1 Steam Connection Rc1 4 1 Steam Outlet Rc1 4 1 2 inch Pipe Horizontal or Vertical Electrical Wiring Port For VD6DF B FM 1 1 4NPT 2 3 4NPSM 5th Edition Dec 11 2015 00 ...

Страница 17: ...53 166 345 103 73 200 G3 4 58 ø160 146 ø116 ø74 Gland Sample lnlet 1 Sample Output 1 2 inch Pipe Horizontal or Vertical Electrical Wiring Port 1 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 5th Edition Dec 11 2015 00 ...

Страница 18: ...et with seal sheet Mounting pipe 2 inch pipe Pipe mounting bracket Purge air inlet Rc1 8 1 Mounting bracket applicable with any mounting method to panels walls or pipes Mounting panel thickness Max 12 1 When option code is specified Rc1 4 or 1 4 NPT female connector is attached Panel cutout dimensions Wall mounting hole drilling dimensions 2 ø9 holes or M8 screws 5th Edition Dec 11 2015 00 ...

Страница 19: ...or from B 100 Density converter from B 80 from B 120 from B 110 from B 100 from B 90 from B 80 110 from A 110 from A 110 from A 60 from A 60 from A 60 from A 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 B4 B5 A2 A3 A5 A6 B4 B5 A2 A3 A4 A5 A6 ø15 8 Specified length by L Note 5th Edition Dec 11 2015 00 ...

Страница 20: ...ion proof construction meeting the requirements of NEC National Electrical Code by Factory Mutual Research Corporation U S A FM a testing organization It also conforms to requirements of OSHA Occupational Safety and Health Act U S A Items 1 4 2 to 1 4 6 cover general cautions in using the Model VD6DF density detector For further details see the following publications For TIIS flameproof requiremen...

Страница 21: ...ing for flameproof detector shall be carried out according to the flameproof metal conduit wiring For TIIS explosion proof specifications the flameproof packing type is used for leading external cables 1 4 5 Maintenance Procedure Do not remove the detector cover in a hazardous area unless power is OFF However if detector maintenance with power on is unavoidable a gas detector check should first be...

Страница 22: ... diameter m D2 Pipe inside diameter m 1 fx C 4 l2 E ρl D12 D22 1 x ρx ρl D22 D12 D22 In equation 1 the values other than ƒx and ρx are determined by the pipe material and construction Thus the density ρx of the liquid can be obtained by measuring the free transfers oscillation frequency ƒx 2 1 2 Density Converter The density converter computes the liquid density using the oscillation frequency sig...

Страница 23: ... vibrator assembly a capacitance pickup electrode and an amplifier Preamplifier Density signal Temperature signal Temperature measuring element Vibrator Sample Piezo electric element Pick up electrode Vibrator cross sectional view of Density Detector Figure 2 2 Schematic Diagram of Density Detector The vibrator assembly consists of a sample path formed by connecting the ends of two thin tubular vi...

Страница 24: ...y outputs a 4 to 20 mA analog signal and 0 to 1 V DC signal corresponding to the liquid density converted to that at reference temperature The digital signals of densities at measuring temperature and reference temperature and measuring temperature and measuring temperature value are also output The converter circuit comprises three printed circuit boards Changing displayed items or setting consta...

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Страница 26: ...r the detector without the sampling unit user should install sampling device suitable to measuring system 3 1 1 Mounting Density Detector The detector without the sampling unit should be installed vertically 1 The pipe mounting bracket is applicable to vertical or horizontal pipe JIS 50A as shown in Figure 3 1 and 3 2 1 The detector should be installed vertically to keep the vibrator pipe vertical...

Страница 27: ... remove the pipe mounting bracket from the detector Using the four bolts and spring washers fix the detector on the bracket as shown in Figure 3 4 Figure 3 3 shows position of holes to be drilled on the bracket 70 0 2 40 0 2 4 ø9 Holes Unit mm Figure 3 3 Position of Holes on the Bracket Density detector Figure 3 4 Mounting on the Bracket 5th Edition Dec 11 2015 00 ...

Страница 28: ... FM flowmeter and PI pressure gauge are necessary to monitor measuring liquid NV1 needle valve is required to control flow rate of a sample liquid BV1 ball valve and NV4 needle valve are used for stopping measuring liquid when the vibrator is cleaned or calibration is performed using standard solution The needle valve is also used for adjusting flow rate NV2 needle valve and NV3 needle valve are u...

Страница 29: ... with the sampling equipment user provided installing place must be near to sample tap on the main pipe be free from vibration meet the ambient conditions specified by the hazardous area when the detector is model VD6DF flameproof type Moreover the sampling unit should be fixed to a concrete base drained well 4 Removing a Packing Sheet for Transportation from the Density Detector The vibrator is f...

Страница 30: ...brator tube requires special skill the exchange of the vibrator should be made by Yokogawa d Pull out the rubber sheet avoiding applying force to the vibrator refer to Figure 3 7 Lock screw Pull rubber sheet in this direction Pull out this rubber sheet after loosening the set screw Use flat blade screw driver to turn this screw fully counterclockwise Rubber sheet Figure 3 7 How to Remove the Rubbe...

Страница 31: ...unshine This instrument can be used in an ambient temperature of 10 to 55 C However direct sunshine in summer may heat the instrument over the range Free from corrosive gases and dusts The structure of this converter is dustproof and rainproof However for maintenance with opening front door of the converter installation in better environment is recommended For the same reason the followings are co...

Страница 32: ...nt the clumping brackets on the same pace to hold the converter on the panel Figure 3 10 illustrates that the converter is mounted on a panel 212 1 275 1 Unit mm Figure 3 9 Panel Cutout Dimensions Figure 3 10 Panel Mounting 2 Wall Mounting Remove the pipe mounting bracket from the converter before wall mounting Make two holes for 8 mm screws in a wall as illustrated in Figure 3 11 222 Unit mm 2 M8...

Страница 33: ...A01 02E 3 Pipe Mounting Mounting bracket is applied to the pipe of nominal size 50A diameter 60 5 mm As shown in Figure 3 13 mount the converter on the vertical pipe inclination causes no problem Figure 3 13 Pipe Mounting 5th Edition Dec 11 2015 00 ...

Страница 34: ...2 3 3 1 Sample Liquid Conduit This piping conducts the measuring liquid to the sampling unit The main process pipe should have two sampling taps sample inlet and sample return as shown in Figure 3 14 The sample conduit from the sample inlet is connected to SAMPLE IN of the sampling unit and the other conduit from the sample return to SAMPLE OUT of the sampling unit The piping procedure is as follo...

Страница 35: ...ressure Air should be clean and dried with 0 3 to 0 5 MPa G Mount a stop valve and a pressure regulator on the pipe from the air source and fix a flexible tube with a copper tube with outside diameter 10 mm should be provided for connecting with the detector Connect the air pipe to the sampling unit only for cleaning the vibrator or calibration with the standard solution Sampling unit BV1 DD NV4 N...

Страница 36: ...iquid conduit should be installed such that the entire conduit can be heated The pipe should also be covered with insulating material see Figure 3 17 2 The steam trap discharge outlet should be open to the atmosphere see Figure 3 18 Sampling line Heat insulating material Trace pipe Figure 3 17 Steam Tracer Pipe Sampling unit Drain pit Steam trap Figure 3 18 Piping at Steam Trap Discharge Outlet 3 ...

Страница 37: ...nce temperature state Temperature signal Density signal after being converted to the reference temperature state 1 If you choose KC the ferrite core of accessories must be attached at the both ends of the Special cable Figure 3 19 Wiring Diagram The cable inlet of the density detector is located at the bottom of the terminal box The density converter has five cable inlets and their size is 27 mm A...

Страница 38: ...tive terminals A flexible fitting is used at the inlet of the density detector 1 and the cable from the detector runs though metal conduit to the duct For Model VD6DF explosion proof detector wiring should be made complying with the Recommended Practice The explosionproof flexible fitting for wiring should be used at the cable inlet G3 4 female of the detector 1 The flexible fitting is not inevita...

Страница 39: ...cores to both ends within 300 mm from the sensor or converter of the special cable as shown in the figure Also apply the included cable straps to both ends to prevent the ferrite cores from moving Cable straps Ferrite core Special cable Ferrite core attachment range Within 300 mm Figure 3 28 Ferrite core attachment 3 4 2 Wiring for Analog Output Signal Output signal of 4 to 20 mA DC output load re...

Страница 40: ...measuring system a contact signal is output For wiring of this contact output use 2 conductor cable When connecting the cable to the converter remove the sheath of conductor 80 mm from its end and attach a solderless terminal for M4 screw Wiring method is same as that of Section 3 4 1 3 4 5 Wiring for Power Supply This wiring is to supply the converter with power Use shielded 2 conductor cable for...

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Страница 42: ... 1 1 Density Detector Vibrator assembly Cover Terminal box cover Terminal box Case Capacitance pickup electrode Oscillation amplifier Coupler Piezoelectric element Lock screw Keep loose during detector operation Lock Vibrators Figure 4 1 Density Detector 5th Edition Dec 11 2015 00 ...

Страница 43: ...thi key displayed number flashes Flashing digit shifts right with every pressing of the key Mode transfer switch FUNCTION No key DSPL measuring mode Mode for normal operation In this mode density at the reference temperature density at measuring temperature or measuring temperature value is displayed by transferring function No CAL calibration mode Mode for calibration MAINT maintenance mode Mode ...

Страница 44: ...ncy temperature Checks output signal Checks LED press SET key Sets low limit of the output range Sets high limit of the output range Sets reference temperature of measuring liquid Sets temperature coefficient of measuring liquid Sets detector constant A Sets detector constant B Displays detector calibration coefficient C span Displays detector calibration coefficient D zero 7 7 Hz Hz LED flash 5 t...

Страница 45: ...on can be input The input density is a data at the reference temperature Note If relation between temperature and density is well known a density at a temperature can be set However the density data at the reference temperature is recommended to achieve accurate calibration Function No 4 Sets temperature of calibration solution 1 Input the temperature of the calibration solution 1 of which density...

Страница 46: ...and detector constant If density is 0 5 to 2 0 g cm3 temperature is 25 C detector constant A is 17074 and detector constant B is 36384 the frequency is 640 to 1400 Hz for normal operation Function No 3 Displays frequency temperature Checks operation of this converter A frequency signal converted from liquid temperature voltage is displayed If temperature is 25 C the frequency is about 25000 to 350...

Страница 47: ... the detector this is indicated in each detector Function No C Displays detector calibration coefficient C span Indicates either the one point or two point calibration has been performed 1 is indicated for one point calibration and calibration coefficient span for two point Function No D Displays detector calibration coefficient D zero Indicates either the one point or two point calibration has be...

Страница 48: ...ding operations described here It is important that air bubble does not remain in the pipe If calibrating is to be made with standard solution conduct the measuring liquid after calibration work to omit cleaning the vibrator However if pressure compensation is to be made see Section 4 3 6 conduct the measuring liquid to obtain compensation value beforehand 1 First set each valve in the sampling un...

Страница 49: ...ication of flowmeter L min Specific gravity of liquid ρ 0 85 15 cP 10 cP 5 cP 1 cP 20 cP 25 cP 30 cP 35 cP 40 cP 50 cP 60 cP Figure 4 4 Flow Rate Characteristics for Sample Liquid Viscosity 8 Confirm that the sample liquid temperature T and pressure P are in the specified range 9 Visually check that the sample liquid is not leaking from the connections 4 3 4 Turning ON the Power Supply the convert...

Страница 50: ...e At the same time obtain density at the reference temperature indicated on the density converter 2 Fully close the ball valve BV1 and open the needle valve NV3 to equalize the sample liquid pressure in the detector to the atmospheric pressure Obtain density at the reference temperature indicated on the density converter 3 Calculate the compensation data using the densities obtained in 1 and 2 Com...

Страница 51: ...essure compensation subtract the compensation value obtained in Section 4 3 6 from density of standard solution and set them to function No 3 and 7 Note When the compensation value is a minus number the set value becomes large than the standard solution density 2 Purge the inside of the vibrator with air as follows Fully close the ball valve BV1 and the needle valve NV4 in the sampling unit Fully ...

Страница 52: ...ed by a hydrometer Sampling should be made when the liquid density is stable NOTE The density of the sample liquid should not change between sampling the liquid and finishing the first calibration 2 Measure the density using the hydrometer and the temperature of the sampled liquid Examine the temperature coefficient if it is not known Using densities at high temperature reference temperature appro...

Страница 53: ...e loaded constant NOTE E001 002 003 004 and 007 are cancelled temporally by pressing the FUNCTION No key in maintenance or calibration mode however in the measuring mode the error indication is displayed again These errors are detected only in the measuring mode E005 and E006 are errors that occur only in the calibration mode You can clear these errors by pressing the SET key After that the densit...

Страница 54: ...fications F Strainer body 316 SS Element 316 SS or Ni option PI Pressure gauge 0 to 1MPa or 0 to 2MPa 316 SS TI Thermometer 0 to 100 C or 0 to 150 C 316 SS FM Flowmeter tapered metal tube flowmeter 1 to 10 L min 316 SS BV1 Ball valve 316 SS NV1 to 4 Needle valve 316 SS DD Density detector V1 V2 Valve ST1 Steam trap SAMPLE IN SAMPLE OUT Figure 5 1 Cleaning the Figure 5 2 Flow Diagram Vibrator 5 Rem...

Страница 55: ...Carefully check the entire surface of the two tubular vibrators If they have dents scratches holes or show signs of the sample liquid leakage the vibrator assembly should be exchanged CAUTION Make sure that the lock screw is not in contact with the vibrator assembly CAUTION The vibrator tube has extremely thin wall hence must be carefully handled Since assembling the vibrator tube requires special...

Страница 56: ... to 200 V p p 200 mV p p 4 to 6 V p p 3 to 0 V A5 B5 A6 B5 B B5 IN B4 B5 R B5 A B5 C B5 D B5 DC voltmeter For measurement of 2 the meter input impedance should be at least 10 MΩ Multimeter Oscilloscope DC voltmeter Disconnect leadwires from terminals IN R and B on PCB connect an oscillator 0 to 2000 Hz output 5 V and apply an input of 100 mV rms Lower 100 mV rms input Remedial measure for abnormal...

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Страница 58: ...y Description 1 2 3 4 5 6 7 8 9 10 11 12 13 14 K9000SK K9000CC K9000DB L9818JB G9303AR G9303BA G9303NE K9000AK K9324PC K9000AC D0117XL A L9826AG L9826AC 1 1 2 2 4 1 1 2 1 1 1 2 2 1 Terminal Box Cover Cover Plug for Models VD6D and VD6DF Plug for Model VD6DS Gasket for Model VD6DS O Ring O Ring O Ring for Model VD6DS Chain Assembly for Model VD6DF Desiccant 2 packs Clamp U Bolt Assembly Bracket Bra...

Страница 59: ...ty Description 1 2 3 4 5 6 7 K9000PQ L9827AR K9000NB L9827AE E9135GZ K9324PC K9003NG 1 1 1 1 1 1 1 Accessories Assembly Brush Injector Allen wrench Spanner Desiccant 2 packs O Ring Set used for item 6 and 7 in page 1 Accessories Assembly Accessories Assembly ...

Страница 60: ...T3H1 01E 7th Edition Feb 2015 YK Model DM8C Liquid Density Converter Item Part No Qty Description 1 2 3 4 5 6 K9005CA K9005AA K9000YR K9005YR K9141TV K9000ZE 1 1 1 1 1 1 Digital Board Assembly Main Board Assembly Cable Assembly red Cable Assembly yellow Fuse 250 V 3 A Transformer Assembly 1 3 4 2 5 6 Style D ...

Страница 61: ...7th Edition Feb 2015 YK Item Part No Qty Description 1 2 3 4 B1003JZ L9811FP K9141TV G9612BC G9612BE 1 4 1 1 1 Cable Gland Cable Gland Fuse 250 V 3 A Connector Rc1 4 for AP1 Connector 1 4NPT for AP2 Accessories Assembly ...

Страница 62: ...selected the KC option and Figure 3 28 Feb 2015 4th Edition DM8C Style C to D P 1 3 1 4 1 5 2 3 4 2 4 5 4 12 and CMPL 12T3H1 01E Comment addition P 4 11 Jun 2012 3rd Edition P 4 9 Figure 4 5 Flow Diagram added P 5 1 Figure 5 2 Flow Diagram added CMPL 12T3H1 01E revised to 6th edition Apr 2009 2nd Edition P 1 4 Standard Accessories P 1 5 DM8C Style B to C change of CMPL 12T3E1 01E P 2 Item 3 and CM...

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