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DM8C VD6 Instruction Manual

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1. ri oo du fe 9 amp ih dpi gi LiT 14 Y Y Wiring port holes 5 027 200 Mounting bracket applicable with any mounting p J method to panels walls or pipes Mounting panel thickness Max 12 with rubber plugs 34 34 34 34 hx 31 35 19 Purge air inlet Rc1 8 Pipe mounting bracket Purge air outlet with seal sheet Mounting pipe When option code is specified Rc1 4 or 1 4 NPT female connector is attached 2 inch pipe Panel cutout dimensions Wall mounting hole drilling dimensions 21241 222 E gt j 2 09 holes or M8 screws 275 1 M omen IM 12T03A01 02E 1 10 1 GENERAL 1 3 3 Special Cable Model DM8W Unit mm 4 Density detector Density converter gt 130 from A from B 100 B4 CXL WHITE 60 from A GRAY B5 OXLd imi 10 from A B4 Specified length ae WHITE by LOOOU A Note BROWN 60 from A from B 80 BROWN Note Cable length is specified by the suffix code of LEILILILT O is specified in meter e g for 50 m L0050 for 100 m L0100 for 2 km L2000 IM 12T03A01 02E 1 4 1 4 1 1 GENERAL 1 11 Cautions in Hand
2. Temperature signal Temperature measuring element Piezo electric element 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 vibrators whose upper ends are connected to a base The connector incorporates an RTD to measure the sample liquid temperature The vibrator assembly also contains a piezoelectric element to maintain vibration corresponding to the sample liquid density The capacitance pickup electrode installed between the two vibrating pipes detects the lateral oscillation frequency of the vibrator The amplifier converts the output of the capacitance pickup electrode into an AC voltage to amplify it This frequency signal is together with the temperature signal from the RTD transmitted to the converter A part of the frequency signal is fed back to the piezoelectric element to maintain the vibrator oscillation IM 12T03A01 02E 2 4 2 PRINCIPLES OF OPERATION 2 2 2 Density Converter Figure 2 3 is a block diagram of the density converter As shown in the diagram the density converter receives the density signal frequency F and temperature signal voltage V from the density detector and finally 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
3. sssssesss 4 10 4 4 2 Calibration with a Sample ssssssssse 4 11 4 4 3 Calibration EITOF ecce tere eto ccr Ee reae 4 11 4 5 OST AEN OND mem 4 12 4 5 1 Operation Procedure ccccceeecceeeeeeeeeeeeeeeeeeeeeseaeeseaeeeeaeeessaeessaees 4 12 4 5 2 Check of Measured Density Value sseeees 4 12 4 5 3 Shutdowtiz seno boe a dE 4 12 MAINTENANCE cssessscessesscseessssesseseesessessesessssessesesessesessessessessesevanenees 5 1 lt CONTENTS gt vii 5 1 Daily Inspection Maintenance eere 5 1 5 1 1 Cleaning the Vibrator in the Detector eeeese 5 1 5 1 2 Exchange of Desiccant in the Detector sss 5 1 5 2 Troubleshooting itr hein iiti i ere bie CARERE 5 2 5 2 1 Checking the Vibrators nnne esee oec 5 2 5 2 2 Checking the RTD ieeiseeeee deceret tente dne ntes 5 2 5 2 3 Checking the Oscillation Amplifier eene 5 2 Customer Maintenance Parts List CMPL 12T3E1 01E Customer Maintenance Parts List CMPL 12T3H1 01E Revision Information m i IM 12T03A01 02E 1 1 1 1 GENERAL 1 1 GENERAL Density is one of the fundamental physical quantities required when the property or composition of aliquid sample is being determined i
4. Trace pipe Sampling line Figure 3 17 Steam Tracer Pipe Steam trap Sampling unit rrr Drain pit Figure 3 18 Piping at Steam Trap Discharge Outlet Piping for Air Purge If the density converter is installed in dusty environment air purging is recommended Air purge should be performed continuously by clean dried air with pressure of 50 kPa G Size 26 x Q4 mm copper or stainless pipe should be used to connect air source to the purge air inlet of the converter The air inlet is Rc1 8 female connection If specified a connector for an Rc1 4 female or 1 4NPT female screw is provided IM 12T03A01 02E Heat insulating material lt 3 INSTALLATION PIPING AND WIRING gt 3 13 3 4 Wiring The vibration type density meter requires the following wirings 1 Wiring between analog output signal 2 Wiring for analog output signal 3 Wiring for digital output signal 10 m or less length is recommended 4 Wiring for contact output for abnormal status 5 Wiring for power supplying 6 Wiring for grounding Figure 3 19 is a diagram of these wirings Detector Special cable Converter Closed when a Alarm failure is detected or the power fails Density signal after being converted to the reference RS 232 C signal temperature state Density signal before being converted to the reference temperature state Temperature signal 0to 1 V DC Density signal after being converted to the re
5. A 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 A IMPORTANT Indicates that operating the hardware or software in this manner may damage it or lead to system failure N NOTE Draws attention to information essential for understanding the operation and features A Tip This symbol gives information that complements the current topic CX SEEALSO This symbol identifies a source to be referred to IM 12T03A01 02E iv INTRODUCTION After sales Warranty B Do not modify the product B During the warranty period for repair under warranty consult the local sales representative or service office Yokogawa will replace or repair any damaged 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 defined 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
6. eeeeeeeeeeee eee ee eene enne nnn ii After sales Warranty oie scotia see iv 1 1 Standard Specifications lt ccccscceseiccccecccsscveseeccececssecevesseccsneseseseesanessene aV Adawa Na 1 1 1 1 1 General Specifications aussissa eie RR Eo AFER n ned 1 1 1 1 2 DCCC CUO a en cs tates did ey cada aut E E as tee tescaseneena tevatene eats 1 2 1 1 3 Converter Model DMC sisi neitin anadenn dana dana dana daaa daaa aada 1 3 1 1 4 Special Cable Model DM8W ssssssseeeeenes 1 5 1 1 5 Standard ACCeSSOFIGS 5 nhi tee ee acr une Ha E eR dies 1 5 1 2 Models and Suffix Codes irent nnm eannan SERERE RRNRE MEN EXR a ER 1 6 1 2 1 General Purpose Detector 1 6 1 2 2 Flameprooft Detector eite re eene eds re ee 1 6 1 2 3 Sanitary Use Detector x 1 o ee fe t Pe ete fai aes 1 6 1 2 4 CONVOMOR P 1 6 1 2 5 opeclal Cable end ieee ined err ane das Ie rad ets 1 6 1 3 External DIM NSIONS ierit nri tnn arto n epu x kn eR an ERE on ETR RENE eR XR Ein aD ex auERE 1 7 1 3 1 BIN elo 1 7 1 3 2 Converter Model DM8C sanaaa a aai 1 9 1 3 3 Special Cable Model DMB8W sssssssssee 1 10 1 4 Cautions in Handling Flameproof Explosionproof Instruments 1 11 1 4 1 Outline of Explosionproof Instruments ssssssssss 1 11 1 4 2 Labeling the Explosionproof Specifications 1
7. G3 4 or 3 4NPSM female only for VD6DF OO B FM Specifications are the same as for the 1 General Purpose Detector except for the above construction 3 Sanitary Use Detector Model VD6DS Process connection Wetted part materials Gasket O Ring Stream tracing Special joint for connection to JIS 6A 6 mm dia pipe within gasket Added to the standard model Teflon Viton Not available 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 with a nickel vibrator IM 12T03A01 02E 1 GENERAL 1 3 1 1 3 Converter Model DM8C Display Digital display five digits LED Display contents Density g cm after conversion to reference temperature center temperature Density g cm at the measuring temperature Measuring liquid temperature C Set density value for the calibration liquid g cm displayed on call Temperature coefficient set value for the calibration liquid x10 g cm C displayed on call Output signal set value 96 displayed on call Setting for output range low limit g cm displayed on call Setting for output range high limit g cm displaye
8. close the tap valve 4 The same procedure as 3 should be made for the sample return conduit Prepare a sample receptacle liquid pan just under the drain valve First fully open the drain valve then gradually open the stop valve When the sample liquid begins to flow out of the drain valve close the stop valve IM 12T03A01 02E 4 3 4 4 3 5 lt 4 OPERATION gt 5 Fully open BV1 and NV4 and half open NV1 in the sampling unit Close drain valve opened in 3 Gradually open the tap valve located on the sample inlet conduit As sample begins to flow out of the drain valve on the sample return conduit fully open the stop valve and fully close the drain valve when no retaining air is found in the liquid 6 Open NV to exhaust retaining air in the pipe When the sample liquid without air flows out from the drain port fully close the NV2 7 Adjustopening of NV1 to make sample flow rate approx 5 l min for the detector Flow rate shown by FM in the VD6SM sampling unit of Yokogawa varies according to viscosity of sample If the viscosity of sample liquid becomes higher flow rate indication also becomes higher than real flow rate see Figure 4 4 Specific gravity of liquid p 0 85 25 cP 40cP 30cP 20 cP TT
9. for digital output 1 of span for analog output Linearity 0 5 96 of span when span is 0 2 g cm or less 1 96 of span when span is more than 0 2 g cm Temperature characteristics 10 5 96 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 98 kPa change Viscosity error 0 1 of span in the range of 0 to 1500 cP IM 12T03A01 02E 1 2 1 GENERAL 1 1 2 Detector 1 General Purpose Detector Model VD6D Detector construction Case material Case coating Case color Wetted part materials Base Vibrator Non explosion protection rain proof construction Cast Aluminum alloy Epoxy resin baked finish Jade green equivalent to Munsell 7 5BG4 1 5 SUS316 SUS316 or Ni Au Brazing BAu 4 Measuring liquid temperature 10 to 100 C Measuring liquid pressure 2 MPaGorless Maximum pressure Steam tracing Process connection Electrical connection Mounting Ambient temperature Weight 4 9 MPaG Available Rc1 4 G3 4 2 inch pipe mounting 10 to 50 C Approx 12 kg 2 Flameproof Explosionproof Detector Model VD6DF Detector construction Process connection Electrical connection TIIS d2G3 or FM Class Division 1 Groups C and D Flameproof construction Rc1 4 or 1 ANPT female only for VDGDF LILT B FM
10. 11 1 4 3 Installation Area and Ambient Conditions sssssee 1 12 1 4 4 External Wiring Wok s ho rote bie ies 1 12 1 4 5 Maintenance Procedu esaeen da nda 1 12 1 4 6 EE oE le E A A A E A A 1 12 2 PRINCIPLES OF OPERATION eeictiana nro kaxteEu teach ini cup icu En ba Gc iaaa 2 1 2 1 Measuring Principlo 1 21 coats nounou nen neuen nautis 2 1 2 1 1 Density Detector o P e e e atm a ot DS 2 1 2 1 2 Derisity CODVOrter e i ade eec e i ee t E aie 2 2 2 2 Main COMpPONne it CERE 2 3 2 2 1 Density Detector onore ake Ponte Poe Re Pone wean Foe te enews 2 3 IM 12T03A01 02E vi IM 12T03A01 02E lt CONTENTS gt 2 2 2 Density Converter ssssssesssseeeeeeeeneenem emen 2 4 INSTALLATION PIPING AND WIRING esee 3 1 3 1 Installation of Density Detector eeeeeneenenennnennennn 3 1 3 1 1 Mounting Density Detector eeeseieeeceitee cnet 3 1 3 1 2 Sampling Unit for Vibration Type Density Meter 3 2 3 2 Installation of Density Converter eene 3 6 3 2 1 Is tallationi ATea robert cta t ex ta rs 3 6 3 2 2 Installation of Density Converter 3 6 3 3 Pipih 3 10 3 3 1 Sample Liquid Conduit 3 10 3 3 2 Air Piping for Maintenance sseennn 3 11 3 3 3 SteamiPlplhg ccm eer nre ecc rd n e
11. 3 11 3 3 4 Piping forAlr PUJE uci taret trattava ce Ra 3 12 3 4 lis 3 13 3 4 1 Wiring between Detector and Converter sseesssss 3 14 3 4 2 Wiring for Analog Output Signal eee 3 16 3 4 3 Wiring for Digital Output Signal eese 3 16 3 4 4 Wiring for Abnormal Status Contact Output ss 3 16 3 4 5 Wiring for Power Supply irent tentent nens 3 16 3 4 6 Wiring for Grounding eem 3 16 OPERATION Mem 4 1 4 1 Component Names and Function eese 4 1 4 1 1 Density Detector 2 rtc er ert e irte chy e ert n en da 4 1 4 1 2 Density Converter e 4 2 4 2 lei 4 3 4 2 1 Operation MOOGG circ c ret cer erneut uk pue CR eges 4 3 4 3 Preparation for MeaSureme ntt ccc cccsecceseeeeseeeeeeneeeeeeeeseeeeseeseseeeeseeeeeeeeeeees 4 7 4 3 1 Check fot PIPING m 4 7 4 3 2 Check for Willtig 2 12 22 1 tani roter ener erre ciet nie AY 4 7 4 3 3 Measuring Liquid FIoW rr FEE IER OE FER 4 7 4 3 4 TumingiON tlie POWOF uncta aeta ta ey aee dex 4 8 4 3 5 Data Input irren re iei tere ede en redeo dr ad ad 4 8 4 3 6 Pressure Compensation ssssssssssssseeeeeenens 4 9 4 4 CalibEatlon EE A E A E A T 4 9 4 4 1 Calibration with Standard Solution
12. RTD Measure electrical resistance between the terminal A2 and A3 When the RTD is normal the resistance shows the value indicated in the following table Table 5 1 Resistance at each temperature of RTD Pt 1000Q 5 2 3 Checking the Oscillation Amplifier First visually inspect the capacitance pickup electrode This electrode should be unstalled near the vibrator with a small gap between them Without this gap the electrode will not function properly If there is moisture or dirt between the electrode and vibrator clean the gap with a cloth Take care not to damage the vibrator Then check the electrical circuitry using a DC voltmeter and other appropriate measuring instruments For the types of instruments and the checkpoints see Figure 5 3 IM 12T03A01 02E 5 MAINTENANCE 5 3 1 B4 and B5 when density detector is operating normally Terminal Piezoelectric element q q Check point Measuring instrument Measuring conditions Normal value Remedial measure for abnormal value D A5 B5 DC voltmeter 12 V 10 96 Check converter INPUT iD A5 B5 D ES Bj Agcps eee 200 V 10 96 assembly the meter input impedance should be at least 10 MO 5 8 to 6 4 V Replace D8 Q IN X Multimeter oo X 10 kQ Range Check pickup electrode B4 B5 Oscilloscope Disconnect leadwires from terminals 6 to 8 V p p Check for defective circuit IN R and B on PCB connect an 150 to 200 V p p components a
13. SUS316 i sr FM Flowmeter tapered metal tube flowmeter 1 to 10 l min SUS316 CONDENSATE OUT Y BV1 Ball valve SUS316 NV1 to 4 Needle valve SUS316 DD Density detector V1 V2 Valve ST1 Steam trap Figure 4 5 Flow Diagram Calibration The vibration type density meter should be calibrated as occasion demands to keep the specified accuracy Calibration has two methods one point calibration and two point calibration and each method is carried out by either sample liquid or standard solution The calibration with sample liquid is not requiring stopping operation and pressure compensation resulting in assurate measurement On the other hand in calibration with standard solution the solution density is once determined at the fixed value density measurement of sample liquid should not be repeated at a laboratory IM 12T03A01 02E 4 10 4 4 1 lt 4 OPERATION gt The one point calibration is equal to that omitting the 2nd calibration two point calibration so the two point calibration using standard solution and sample liquid is described as follows Since the following is described assuming that the density converter is installed in the vicinity of the density detector for the connector installed away from the detector please edit the manual for it and carry out the calibration according to the manual Calibration with Standard Solution Provide two kinds of standard solution whose density at reference temperatures is
14. This section describes a sampling that is provided by user for the density meter The sampling equipment is equipped with valves a thermometer a flowmeter etc and is located near to process pipe and the density detector The sampling equipment is used to provide good condition to measure liquid density easy to monitor measuring and maintenance condition such as calibration and cleaning the vibrator Install the sampling equipment according to the following For details of piping from process to the equipment refer to the section 3 3 IM 12T03A01 02E lt 3 INSTALLATION PIPING AND WIRING gt 3 3 1 Flow Diagram Figure 3 5 shows a flow diagram of a typical sampling equipment Model VD6SM sampling unit of Yokogawa is also designed according to this diagram Y a A A Element specifications vi Xv2 F Strainer body SUS316 STEAM IN Element SUS316 or Ni option b a PI Pressure gauge 0 to 1MPa or 0 to 2MPa SUS316 Tl Thermometer 0 to 100 C or 0 to 150 C SUS316 I STI FM Flowmeter tapered metal tube flowmeter 1 to 10 l min SUS316 CONDENSATE OUT i 9 BV1 Ball valve SUS316 NV1 to 4 Needle valve SUS316 DD Density detector V1 V2 Valve ST1 Steam trap Figure 3 5 Flow Diagram In Figure 3 5 each element of the sampling equipment is shown F filter is usually 80 meshes prevents a solid from entering into the sampling line TI thermometer FM flowmeter and PI pressure gauge are necessary
15. and voltage of the temperature Each value of E p D D or rx in equation 1 is a function of liquid temperature hence the value of f is also a function of temperature To obtain the correct density the factors A and By depending temperature should be previously compensated for the temperature as follows k _ Ag ei dak be eae ed BE ee ee eee 2 V1 px Ba where A t A1 1 0060 1 9814 x 10 T 9 7683 x 10 87 B By 1 4 5x 105 T 30 A t A 131072 100 B B 300 T Liquid temperature C Note Both A and B are constants of the detector which has inherent values From equation 2 and 3 the density p can be obtained E Xx px og nds a ach ded Stade UTERINE 3 The p in equation 3 represents the liquid density at measuring temperature The density oT at the reference temperature can be obtained by the following equation 4 PTB PxtO Ty TB c n 4 a Temperature coefficient of density for measuring liquid g cm3 C Tx Liquid temperature at density measurement C Tg Reference temperature C IM 12T03A01 02E lt 2 PRINCIPLES OF OPERATION gt 2 3 Main Components Density Detector Figure 2 2 is a schematic diagram of the density detector As shown in the figure the density detector consists mainly of a vibrator assembly a capacitance pickup electrode and an amplifier Vibrator Pick up electrode Breamblifier JTO Density signal
16. is specified For the detector without the sampling unit user should install sampling device suitable to measuring system Mounting Density Detector The detector without the sampling unit should be installed vertically note The pipe mounting bracket is applicable to vertical or horizontal pipe JIS 50A as shown in Figure 3 1 and 3 2 Note The detector should be installed vertically to keep the vibrator pipe vertical 1 Pipe Mounting The pipe mounting bracket is attached to the detector to mount it on a vertical pipe For mounting on a horizontal pipe remove the mounting bracket from the detector to turn it 90 and fix it again to the detector Figure 3 1 shows installation on a vertical pipe and Figure 3 2 shows on a horizontal pipe Figure 3 1 Installation on a Vertical Pipe Figure 3 2 Installation on a Horizontal Pipe IM 12T03A01 02E 3 2 lt 3 INSTALLATION PIPING AND WIRING gt 2 Bracket Mounting This bracket is not the pipe mounting bracket Release the four bolts with spring washers to 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 Unit mm 70 0 2 k gt 4 29 Holes 40 0 2 Figure 3 3 Position of Holes on the Bracket Density detector Figure 3 4 Mounting on the Bracket 3 1 2 Sampling Unit for Vibration Type Density Meter
17. key When protecting again display any number other than 77 for example 78 and press SET key This operation is invalid unless some operation is made after the protection release for example setting function No 2 Function No 2 Displays frequency density Checks operation of this converter Frequency corresponding to measured density are displayed When the converter is normal the frequency ranges from 600 to 700 Hz to 1000 or 1500 Hz Note Displayed frequency varies with measured density liquid temperature and detector constant If density is 0 5 to 2 0 g cm 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 35000 Hz for normal operation Function No 4 Checks output signal Checks zero point and span of an analog output signal Note The data at shipping is described in a data sheet in the converter Function No 5 Checks LED press SET key Function to check LED data display When SET key is pressed all displays flash five times if it is normal Function No 6 Sets low limit of the output range Sets a low limit density value g cm of an analog output range I
18. of Density Converter The density converter can be installed on a panel or a wall or 2 inch pipe The pipe should be vertical to fix the mounting bracket on it see Figure 3 8 Note Mounting attitude is free from the converter performance Mounting should be made of the following procedures Pipe mounting Mounting bracket hardware gt LA Washer Converter X Spring washer iust WD Bolt M8x10 Bolt M8x14 Figure 3 8 Pipe Mounting IM 12T03A01 02E lt 3 INSTALLATION PIPING AND WIRING gt 3 7 1 Panel Mounting The pipe mounting bracket should be removed from the converter before panel mounting Panel cutout dimensions are shown in Figure 3 9 Before inserting the converter into front of the panel remove the clumping brackets from both sides of the converter case After the case is inserted into a panel remount 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 Unit mm 212 1 lt A 275 1 Y Figure 3 9 Panel Cutout Dimensions Pd RE RSs S Figure 3 10 Panel Mounting IM 12T03A01 02E 3 8 lt 3 INSTALLATION PIPING AND WIRING gt 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 Unit mm 222 2 M8 Screws Figure 3 11
19. the detector runs though metal conduit to the duct For Model VD6DF explosionproof 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 Note The flexible fitting is not inevitable The Detector not moved for usual check or maintenance does not require the flexible tube IM 12T03A01 02E lt 3 INSTALLATION PIPING AND WIRING gt 3 15 Figure 3 23 Wiring to Density Detector Terminals Figure 3 24 Spanner for Open closing Terminal Box Cover Cable Terminal box case r Be sure to screw in at least 12 mm 5 threads G3 4 screw TIIS explosionproof Lock nut 3 4NPSM FM explosionproof Explosionproof flaxible fitting Figure 3 25 Explosionproof Flexible Fitting Connection to Density Converter The density converter is installed in field or indoors control room The connector for passing through cable should be sealed for air purge The connector with a ring packing as shown in Figure 3 26 should be used or the inlet of metal conduit is filled with silicon sealing compound Duct or protective pipe for the cable should be provided to prevent the cable from damage Cable Nut Converter case Lock nut Flaxible fitting Figure 3 26 Packing Gland Figure 3 27 Cable Inlet for Metal Conduit Type Connector for Passing through Cable Take the special cable into the co
20. 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 used for draining liquid from the vibrator or for picking up sample for manual analysis When viscosity of a measuring liquid is to be lowered for example the pour point of measuring liquid is high arrange the density detector and the liquid pipe should be warmed individually Steam pipe can be connected to the density detector and the liquid pipe can also be traced by steam pipe V1 stop valve is to supply the steam to the density detector and V2 stop valve is to supply the steam to tracing pipe ST1 steam trap is used to drain condensed water Note 1 Kind of valve used in the sampling equipment varies with the purpose of use This instruction manual gives a detailed name of equipment for example ball valve used for limited purpose and shows a general name within when equipment type is not restricted for example stop valve Note 2 Density Detectors of Model VD6D general purpose type and VD6DF flameproof have steam pipe connections however Model VD6DS sanitary use has not the connections Note 3 Model VD6SM sampling unit a product of Yokogawa is applie
21. 05 g cm 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 Density under working pressure density under atmospheric pressure When calibration the compensation data should be subtracted from the density value of the standard solution SAMPLE IN SAMPLE OUT Y b a a A A Element specifications vi Xv2 F Strainer body SUS316 STEAM IN X X Element SUS316 or Ni option b a Pl Pressure gauge 0 to 1MPa or 0 to 2MPa SUS316 i Tl Thermometer 0 to 100 C or 0 to 150 C
22. 2 Purge the sample liquid in the vibrator from the drain port of the needle valve NV3 by blowing 0 05 MPa G air 3 Remove the blind plugs from the pouring port of the standard solution two places and pour cleaning liquid about 200 ml into the vibrator 4 Aftera while fix blind plugs again on the pouring ports and purge the cleaning liquid in the vibrator as described in 2 Wash the inside of the vibrator pipe with a brush accessory as shown in Figure 5 1 SAMPLE IN SAMPLE OUT Y b a A a A Element specifications vi Xv2 F Strainer body SUS316 STEAM IN Element SUS316 or Ni option b a Pl Pressure gauge 0 to 1MPa or 0 to 2MPa SUS316 H Tl Thermometer 0 to 100 C or 0 to 150 C SUS316 9s FM Flowmeter tapered metal tube flowmeter 1 to 10 l min SUS316 CONDENSATE OUT Y BV1 Ball valve SUS316 NV1 to 4 Needle valve SUS316 DD Density detector V1 V2 Valve ST1 Steam trap Figure 5 1 Cleaning the Vibrator Figure 5 2 Flow Diagram b Remove the blind plugs again from the pouring ports of the standard solution and pour the cleaning liquid about 200 ml After a while fix the blind plugs and purge the sample liquid by blowing 0 05 MPa G air After the liquid is blown out increase the air pressure up to 0 2 to 0 3 MPa G blowing air for 2 or 3 minutes to dry the inside of the vibrator Exchange of Desiccant in the Detector Desiccant is used to protect the oscillation amplifier in the detect
23. A 10 cP 50 cP 35 cP 15 cP 60 cP 9 cP 1 cP 20 E E 15 D D E 10 o 2 8 5 0 5 10 15 20 Actual flow rate l min 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 Turning ON the Power Supply the converter and a receiving unit recorder computer etc with power with specified voltage and frequency The receiving unit should be ready to receive the data and controller should be adjusted to perform accurate control Data Input Set the mode transfer switch to MAINT maintenance mode and input data to the function No 6 7 8 9 A and B For details of data to be input refer to Section 4 2 Data is input with SHIFT INCR and SET keys For details of these keys operation refer to Figure 4 1 2 When temperature coefficient of measuring liquid that is to be input into function No 9 is unknown jet refer to 4 4 2 Calibration with Sample Liquid 2 IM 12T03A01 02E 4 OPERATION 4 9 4 3 6 Pressure Compensation 4 4 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 0 000
24. D explosionproof Sanitary Use Detector Modei Sufix Code Option Code Descripfon SS vosos em Stan use eee Iweormawm 5 0 esses CS L0 Tess Converter Moder Sufix Code OptonGodeDescipion wc em Got e NEN 0i NN 180 to 264V AC 50 60Hz I T 3 Option IAP1 Rc1 4 Air purge connector IAP2 1 4NPT female Special Cable Model Suffix Code Option Code wow 0 t wren nun e Ss Idm Note Enter the cable length in LOOOO in m Example L0050 for 50 m L0100 for 100 m L2000 for 2 km IM 12T03A01 02E 1 GENERAL 1 7 1 3 External Dimensions 1 3 1 Detector General Purpose and Flameproof Detector Models VD6D and VD6DF Unit mm Steam Connection Rc1 4 Sample Inlet 1 Rci A O Steam Outlet Rc1 4 1 Tur mV 2 inch Pipe S H T Horizontal or Vertical R l m oo r O Electrical Wiring Port G3 4 2 342 200 R o For VDeDF LILI B FM ENS 1 1 ANPT 2 3 ANPSM IM 12T03A01 02E 1 8 1 GENERAL Sanitary Use Detector Model VD6DS Unit mm Gland 166 Sample Inlet 345 Electrical Wiring Port 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 IM 12T03A01 02E 1 GENERAL 1 9 1 3 2 Converter Model DM8C a 1883 Unit mm 138 240 116 M
25. Density Converter Item Part No Qty 1 K9000ZM 1 K9000VV 1 2 K9000YJ 1 8 K9000YH 1 4 K9000YR 1 5 K9000YQ 1 6 K9141TV 1 7 K9000ZE 1 Description Spare Display Unit for style B Display Board Assembly for style C CPU Board Assembly Main Board Assembly Cable Assembly 7 pins Cable Assembly 5 pins Fuse 250 V 3 A Transformer Assembly Do not change these parts call service personnel YOKOGAWA 4 Yokogawa Electric Corporation All Rights Reserved Copyright O 1987 Yokogawa Electric Corporation CMPL 12T3H1 01E Subject to change without notice 6th Edition Mar 2012 YK Accessories Assembly Item Part No Qty Description 1 B1003JZ 1 Cable Gland 2 L9811FP 4 Cable Gland 3 K9141TV 1 Fuse 250 V 3 A 4 G9612BC 1 Connector Rc1 4 for AP1 G9612BE 1 Connector 1 4NPT for AP2 CMPL 12T3H1 01E 6th Edition Mar 2012 Revision Information e Title Model DM8 Vibration Type Density Meter Manual No IM 12T03A01 02E Jun 2012 3rd Edition Page layout changed by InDesign 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 CMPL 12T3H1 01E P 1 Item 1 Dec 2006 1st Edition Newly published For Style B W f you want to have more information about Yokogawa products you can visit Yokogawa s
26. Holes for Wall Mounting SS igh a Figure 3 12 Wall Mounting Using two mounting brackets mount the converter on the wall see Figure 3 12 IM 12T03A01 02E lt 3 INSTALLATION PIPING AND WIRING gt 3 9 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 gi LA a Figure 3 13 Pipe Mounting IM 12T03A01 02E 3 10 3 INSTALLATION PIPING AND WIRING 3 3 Piping The vibration type density meter requires the following piping Sample liquid conduit 2 Airpiping for maintenance 3 4 Piping for air purge Steam piping Sample liquid conduit is a pipe to conduct measuring liquid to the density detector Air piping for maintenance is to obtain air to blow away liquid from the vibrator at maintenance vibrator cleaning calibration with standard solution Steam piping which is installed according to requirement is to obtain a steam to heat the sample liquid conduit Air purge piping is necessary when the converter is installed in dusty environment The sample liquid conduit referred here indicates pipes between the main process pipe and the sampling equipment For piping within the sampling equipment refer to Section 3 1 2 3 3 1 Sample Liquid Conduit This piping conducts the measuring liquid to the sampling unit The main process pipe
27. Internal assembly fixing screw ENSITY M for transportation INCR A key Increases the number of a flashing digit SET key Used to enter a displayed data FUNCTION SHIFT gt INCRA Data sheet SHIFT gt key Pressed thi key displayed number flashes Flashing digit shifts right with every pressing of the key FUNCTION No key Mode transfer switch Cover of terminal board 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 for check of operating condition setting a detector constant a reference temperature Figure 4 2 Component Names of Density Converter IM 12T03A01 02E 4 OPERATION 4 3 4 2 4 2 1 Operation Operation Mode Operation of the Model DM8 vibration type density meter ruled by the mode as shown in Table 4 1 Measuring mode DSPL calibration mode CAL and maintenance mode MAINT are transferred with the mode transfer switch Table 4 1 Operation Modes and Function No Measuring No mem Displays density at reference temperature mode DSPL Calibration mode CAL Maintenance mode MAINT DODPFOANDAARF WN AlBPOOHON AAA ofn Displays density measured value Displ
28. M 12T03A01 02E lt 4 OPERATION gt Function No 7 Sets high limit of the output range Sets a high limit density value g cm of an analog output range Note Difference between high and low limit value should be 0 05 g cm3 or more If an inadequate value is set the function No returns to 6 operations of 6 and 7 are related when setting is made at 6 setting should also be made at 7 Function No 8 Sets reference temperature of measuring liquid Sets a reference temperature C of measuring solution Function No 9 Sets temperature coefficient of measuring liquid Sets the value which is 1 x 10 100000 times the temperature coefficient of measuring solution g cm C to change it to plus integer Note Purified water is an exception its maximum density is at approx 4 C Generally temperature coefficients of any liquids are minus number Function No A Sets detector constant A Sets the detector constant A Since the detector constant A is an inherent characteristic of the detector this is indicated in each detector Note Detector constant A changes with each calibration Function No B Sets detector constant B Sets the detector constant B Since the detector constant B is also an inherent characteristic of the detector this is indicated in each detector Function No C Displays detector calibration coefficient C span Indicates e
29. 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 u Connect when cleaning the density detector Air supply 300 to 500 kPa G Flexible tube Reducing Stop valve valve Figure 3 16 Air Piping for Maintenance Steam Piping This is installed to heat measuring liquid whose pour point is high and to decrease its viscosity The sampling unit with steam trace pipes should be used for this purpose Connect a pipe from steam source to the sampling unit STEAM IN inlet The sample liquid conduit also should have a steam tracer pipe Steam of pressure 0 3 to 0 5 MPa and temperature of 140 to 160 C is preferable Installing the tracer pipe for the sample liquid conduit should be performed after pressure retentive and leak test of the conduit Notes for the tracer piping are as follows 1 The tracer pipe of the sample liquid 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 IM 12T03A01 02E 3 12 3 3 4 lt 3 INSTALLATION PIPING AND WIRING gt
30. 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 constants are performed by keys or transfer switches on the front panel Frequency of Density Fx j Multiplexer Po Reference frequency COUNTER Temp Signal RT r R V Multiplexer V F pe H ROM E PN RAM Ref temp Span 200 V Modulation EEPROM Ref temp Zero 2 0to1V VA 4 to 20 mA Zero Integrator Oa 7 Span Key amp Display Serial Controller Communi TD a Driver Fund Digital Output ontroller Fail Alarm M o Figure 2 3 Block Diagram of Density Converter IM 12T03A01 02E 3 3 1 lt 3 INSTALLATION PIPING AND WIRING gt 3 1 INSTALLATION PIPING AND WIRING Model DM8 vibration type density meter consists of a density detector and a density converter The density detector is generally installed in field and sampling piping is made to conduct measuring liquid The density converter is generally installed in the vicinity of the density detector It must not be installed in hazardous area It can be installed in a control room though it is far away from the detector receiving digital signal Installation of Density Detector The density detector is shipped with a sampling unit if it
31. User s Manual Model DM8 Vibration Type Density Meter IM 12T03A01 02bE vigilantplant YOKOGAWA IM 12T03A01 02E f 3rd Editi Yokogawa Electric Corporation n INTRODUCTION i INTRODUCTION This manual describes the specifications 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 Media No IM 12T03A01 02E 3rd Edition Jun 2012 YK IM 12T03A01 02E All Rights Reserved Copyright 2006 Yokogawa Electric Corporation INTRODUCTION For the safe use of this equipment B Safety Protection and Modification of the Product 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 specified 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 Modification of the product is strictly prohibited The following symbols are used in the product and user s manual to indicate that there are precautio
32. already known 1 One density standard solution 1 should be near to the low limit of the measuring range and the other to the high limit standard solution 2 Temperature coefficients g cm C of these standard solutions should be obtained beforehand 1 When measuring the density of the standard solution use a hydrometer whose minimum scale is 0 0005 kg cm Calibration should be made in the following procedure During calibration only the density detector and the density converter are to be drived and the unit to receive output signals from the converter can remain stopped 1 Setthe converter to CAL mode and input data corresponding to function No 3 4 5 7 e and 9 For pressure 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 open the needle valve NV2 and NV3 connect an air pipe to the outlet port of the needle valve NV3 and blow air for one or two minutes Pneumatic pressure should be 0 2 to 0 3 MPa 2 2 For sample liquid remains in the vibrator blow it out by 0 05 MPa G pneumatic pressure and increase
33. ased immediately after calibration or maintenance mode Calibration status CALIBRATION _ START Cale space Note Nothing is output during calibration However when a parameter error occurs output becomes as follows ERROR CpLp 5 or 6 CALIBRATION _ END Cal space E Fail alarm ERROR _ERROR Cale aca Note When multiple errors occur each error No for the respective errors is output Example ERROR 1 _ ERROR 3OgLe space Output signal span 0 05 to 0 5 g cm 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 coefficient 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 IM 12T03A01 02E Case construction Coating color Coating finish Mounting Air purge connector Electr
34. ays measuring liquid temperature Sets density of calibration solution 1 Sets temperature of calibration solution 1 Sets temperature coefficient of calibratio solution 1 Starts calibration 1 press SET key Sets density of calibration solution 2 Sets temperature of calibration solution 2 Sets temperature coefficient of calibratio solution 2 Starts calibration 2 press SET key Canceles protect enter 77 Displays frequency density Displays frequency 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 1 Measuring mode DSPL Mode for normal operation 0 0000 g cm 000 0 c LILIDIx10 g cm C CAL 1 displays density after calibration 0 0000 g cm 000 0 c O010x10 g cm C CAL 2 displays density after calibration 77 Hz Hz OOO 96 LED flash 5 times 0 0000 g cm 0 0000 g cm 000 0 c LILILIX10 g cm C o0000 00000 An analog output in this mode is density value at the reference temperature Moreover density value at measuring liquid temperature and temperature of measuring liquid are digitally output The density value at the reference temperature without func
35. d on call Reference temperature center temperature set value C displayed on call Temperature coefficient set value for the measuring liquid x10 g cm C displayed on call Fault contents display Output signal Analog output 4 to 20 mA DC load resistance 550 Q or less and 0 to 1 V DC load resistance 250 kO or more isolated output Density g cm after conversion to the reference temperature Digital output RS 232 C 1 Communication specifications 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 Output signal Transmitting contents Measured data Density g cm after conversion to the reference temperature density g cm 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 O IM 12T03A01 02E 1 4 1 GENERAL gt e Output format Measured data Jp woe OP RUN Cale space space ES 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 rele
36. d to Model VD6D general purpose type or Model VD6DF flameproof type It is not recommended for the Model VD6DS sanitary use used for food IM 12T03A01 02E 3 4 lt 3 INSTALLATION PIPING AND WIRING gt S y Density meter sampling unit Anchor bolt Drain pit Concrete base Figure 3 6 Installation Example for Sampling Unit Model VD6SM 2 Note of Designing a Density Meter Sampling Unit Minimize liquid pipe length to improve response Design the piping not to allow air bubbles to remain in the pipe which may cause an error Piping should not have sharp bending where solids may accumulate Maintenance such as cleaning should be made easily Select element material most suitable for measuring liquid Especially for foodstuff measurement the selection should be done strictly 3 Installation of a Density Meter Sampling Unit For the density detector with the sampling unit or with the sampling equipment user provided installing place must benearto sample tap on the main pipe be free from vibration meetthe 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 IM 12T03A01 02E lt 3 INSTALLATION PIPING AND WIRING gt 3 5 4 Removing a Packing Sheet for Transportation from the Density Detector The vibrator is fixed to the amplifier case to avoid being damaged dur
37. ference 4 to 20 mA DC temperature state Power supply 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 cable can pass any inlet of them one cable to one inlet Figure 3 20 shows an example of allocated inlets Analog output signal Inlet of special cable SO M So i rou OS m Digital output signal oz Contact output for abnormal status Power supply NS Figure 3 20 Cable Inlet of Density Converter IM 12T03A01 02E 3 14 3 4 1 lt 3 INSTALLATION PIPING AND WIRING gt Figure 3 21 shows terminal arrangement of the density detector Terminals Function Output Frequenc ET A3 Temperature Sensor E Figure 3 21 Terminal Arrangement of Density Detector Wiring between Detector and Converter This wiring is to be carried out with special cable of specified length The cable is terminated as illustrated in Figure 3 22 Pay attention not to stain or wet terminated 4 Density detector Density converter Figure 3 22 DM8W Cable Connection to Density Detector Remove the cover of the terminal box using the spanner in accessories and insert the special cable into the cable inlet Connect each conductor to the respective terminals A flexible fitting is used at the inlet of the density detector note and the cable from
38. home page at the following web site Home page http www yokogawa com an IM 12T03A01 02E
39. ical connection Weight 1 GENERAL 1 5 Dust and rain proof construction Door Equivalent to Munsell 2 8GY6 4 0 9 Case Equivalent to Munsell 2 0GY3 1 0 5 Baked finish epoxy resin To panel wall or 2 inch pipe Rc1 8 Rc1 4 or 1 4NPT female is also optionally available Five holes 27 mm dia Attached with four plastic waterproof plugs equivalent to JIS A15 and one plastic waterproof plug equivalent to JIS A20 Approx 7 5 kg 1 1 4 Special Cable Model DM8W Type Insulator Sheath Insulation resistance Conductor resistance Finished O D Weight Six conductor double shield cable Polyethylene Polyvinyl chloride 1000 MO km 15 31 O km 15 8 mm Approx 0 3 kg m 1 1 5 Standard Accessories Syringe for injecting standard Ipis solution or solvenet P Brush for cleaning the detector Allen wrench for terminal box for Detector VD6 Allen wrench for locking the cover Silica gel Fuse for the converter 3A for Converter DM8C IM 12T03A01 02E 1 6 1 2 1 2 1 1 2 2 1 2 3 1 2 4 1 2 5 lt 1 GENERAL gt Models and Suffix Codes General Purpose Detector VD6D eeeeeeeeeeeeneeneenee ooocoeeecoocceeeoe General purpose detector Vibrator material ia SUS316 Ni IL Tee Flameproof Detector VD6DF eeeeeeeeeeeeseeneenee ovocoeeecoocoeeeoe Flameproof detector Vibrator material FANE SUS316 Ni It Tem 1 Option FM NEC Class Division 1 Group C and
40. ing transportation Remove the rubber sheet used for the fixing The rubber sheet is inserted between the case and the coupler of the vibrator assembly Remove the sheet according the steps below For component names refer to the section 4 1 1 a Remove the lock with a hexagonal bar wrench Release the cover by turning it counterclockwise and pull it down not to touch the internal assembly b Remove the cover with desiccant from the vibrator AN CAUTION The vibrator tube has extremely thin wall hence must be carefully handled Since assembling the vibrator tube requires special skill the exchange of the vibrator should be made by Yokogawa c Release the lock screw for the vibrator turning the screw counterclockwise completely with a flat chip screw driver Turn it enough if not the vibrator may touch the screw during measurement causing an error In addition pay attention not to bend or damage the vibrator because it is made of a thin pipe d Pull out the rubber sheet avoiding applying force to the vibrator refer to Figure 3 7 Lock screw Use flat blade screw driver to turn this screw fully counterclockwise Pull rubber sheet in this direction Rubber sheet Pull out this rubber sheet after loosening the set screw Figure 3 7 How to Remove the Rubber Sheet e Remount the cover removed in the item b Also remount the cover in the item a to the case and lock it Now the removing the rubber sheet fin
41. ishes Keep the rubber sheet which is necessary for transportation of the density converter IM 12T03A01 02E 3 6 3 2 lt 3 INSTALLATION PIPING AND WIRING gt Installation of Density Converter 3 2 1 Installation Area The density converter should be installed in the place described below 1 4 5 6 The vicinity of the sampling unit where maintenance or calibration is made easy The density converter is designed dustproof and rainproof structure so that it can be installed outdoors However when it is used with the Model VD6DF flameproof detector it cannot be installed the hazardous area must be installed in the nonhazardous area Further when digital output signal is used for a receiver able length between the converter and the receiver should be 10 m or less Free from vibration Vibration may cause illegal contact in electric circuits Avoiding from direct sunshine 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 following 5 and 6 are conditions for selecting installation area Avoiding excessive humidity Avoiding wide temperature variation 3 2 2 Installation
42. ither the one point or two point calibration has been performed 1 is indicated for one point calibration and calibration coefficient span for twopoint Function No D Displays detector calibration coefficient D zero Indicates either the one point or two point calibration has been performed 0 is displayed for one point calibration and calibration coefficient zero point than 0 is displayed for two point calibration IM 12T03A01 02E 4 3 4 3 1 4 3 2 4 3 3 4 OPERATION 4 7 Preparation for Measurement Check for Piping Check the following points 1 lIsthe pressure difference 100 kPa or more between both sampling tap 2 Is the diameter of the sampling pipe appropriate Is length of the inlet pipe too long Note The sample inlet pipe is usually JIS 15A or Sch 40 to 80 stainless steel pipe The pipe length between sampling tap and the detector should be 10 m or less 3 Are valves and meters pressure gauge thermometer provided in the sampling pipe for normal operation and maintenance 4 Is air for cleaning the detector provided Note Dried 0 3 to 0 5 MPa G air is requires for cleaning the detector 5 Can heating steam for the density detector be stopped during operating time Check for Wiring Check that whole wiring of the measuring system including a receiving unit for example recorder is completed When the detector is explosionproof type place the terminal box cover as completely a
43. l and Analog Signal Output Statuses Eight function Nos from 3 to A are provided in the calibration mode see Table 4 1 Among them 6 and A are to specify the calibration computation and others are to input data required for the calibration Function No 3 Sets density of calibration solution 1 Density value g cm of a calibration solution for one point calibration or 1st calibration of two point calibration 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 at the reference temperature is set at 3 Function No 5 Sets temperature coefficient of calibratio solution 1 Enter the value which is 100000 times the temperature coefficient g cm C of the liquid for calibration 1 Note The temperature coefficient 0 00086 g cm3 C becomes the value 086 Function No 6 Starts calibration 1 press SET key Pressing SET key executes calibration computation or also executes the first calibration of the two point calibration Note For calibration procedure refer to Section 4 4 IM 12T03A01 02E 4 OPERATION 4 5 Function N
44. ling Flameproof Explosionproof Instruments Outline of Explosionproof Instruments Specifications of Explosionproof Instruments conform to the regulations of relevant public organizations Model DM8 Vibration Type Liquid Density Meter consists of a density detector and a density converter Model VD6DF density detector explosionproof instrument can be installed in hazardous area where explosive gases may be generated It should be noted however that the method of installation ambient conditions and the handling of these instruments must conform to the regulations of relevant public organizations The applicable explosionproof regulations and the cautions marked on the analyzer shall be strictly observed when using Model VD6DF in a hazardous location A CAUTION 1 4 2 Model VD6D and Model VD6DS Density Detector which are not explosionproof instrumment cannot be installed in hazardous location Model VD6DF density detector has either TIIS or FM flameproof type of explosionproof specifications The TIIS type has passed tests conducted by a public authority in accordance with the Labor Safety and Health Law Japan which regulates domestic explosionproof electrical equipment The FM type has been certified to have an explosionproof 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 Occupati
45. n hazardous area where specified gases are present However do not install the detector at the place where explosive gases may be continuously present and in which the gas concentration is continuous or for long period equal to or more than the lowest gas explosion limit Environmental conditions at the installation site are very important to the detector Before installing the detector check the temperature humidity and altitude of the site The conditions shall not exceed the specified ranges The temperature range 10 to 50 C in indicated on the data plate and the altitude shall be 1000 meters or less above sea level and the relative humidity range 45 to 85 96 External Wiring Work External wiring for flameproof detector shall be carried out according to the flameproof metal conduit wiring For TIIS explosionproof specifications the flameproof packing type is used for leading external cables 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 made to determine whether a hazardous atmosphere exits in the installation area Repairs The following points must be observed during repairs The detector must be restored to their original conditions electrically and mechanically to maintain their flameproof properties The gaps path lengths and mechanical strength of enclosures are imp
46. n industrial processes Especially density measurement of a sample liquid is indispensable in many industries such as electric manufactures chemical industries oil refineries 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 Standard Specifications General Specifications 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 Characteristics overall characteristics after combing the detector and the converter Repeatability 5 x10 g cm
47. nd replace oscillator 0 to 2000 Hz output 5 V 200 mV p p them and apply an input of 100 mV rms 4to 6 Vp p B5 DC voltmeter Lower 100 mV rms input 3 to 0 V F0502 ai Note Regading to repair parts consults with service personnel Figure 5 3 Oscillation Amplifier Check Points IM 12T03A01 02E Customer Maintenance Parts List Model VD6D VD6DF VD6DS Density Detector Item Part No Gty 1 1 2 K9000SK 1 3 K9000CC 2 4 K9000DB 2 5 L9818JB 4 6 G9303AR 1 7 G9303BA 1 8 G9303NE 2 9 K9000AK 1 10 K9324PC 1 11 K9000AC 1 12 D0117XL A 2 13 L9826AG 2 14 L9826AC 1 Description 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 Bracket YOKOGAWA 4 Yokogawa Electric Corporation All Rights Reserved Copyright 1987 Yokogawa Electric Corporation Subject to change without notice CMPL 12T3E1 01E 5th Edition Apr 2009 YK Accessories Assembly Item Part No Qty Description 1 K9000PQ 1 Accessories Assembly 2 L9827AR 1 Brush 3 K9000NB 1 Injector 4 L9827AE 1 Allen wrench 5 E9135GZ 1 Spanner 6 K9324PC 1 Desiccant 2 packs 7 K9003NG 1 O Ring Set used for item 6 and 7 in page 1 CMPL 12T3E1 01E 5th Edition Apr 2009 Customer Maintenance Parts List Model DM8C
48. ns for safety B 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 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 B 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 INTRODUCTION iii B Symbol Marks Throughout this user s manual you will find several different types of symbols are used to identify dif ferent sections of text This section describes these icons NwARNING Indicates a potentially hazardous situation which if not avoided could result in death or serious injury
49. nverter from the leftmost inlet and connect the each conductor to the respective terminals IM 12T03A01 02E 3 16 3 4 2 3 4 3 3 4 4 3 4 5 3 4 6 lt 3 INSTALLATION PIPING AND WIRING gt Wiring for Analog Output Signal Output signal of 4 to 20 mA DC output load resistance 550 Q or less and 0 to 1 V DC load resistance 250 kO or more are provided Carry out either or both of wirings as necessary Shielded 2 conductor for one signal or 4 conductor for two signals cable are used for wiring For connecting the cable to the converter remove the sheath of conductor about 50 mm from its end and attach a solderless lug for M4 screw omit The shield of the cable should be grounded at the receiving unit Wiring method metal conduit and others is same as that of Section 3 4 1 Wiring for Digital Output Signal The Model DM8C density converter outputs digital signals through RS 232C interface besides analog signal for details of digital signal refer to Standard Specifications in Chapter 1 When using this signal use a shielded 3 conductor cable for wiring Cable length from the converter to a receiving unit should be 10 m or less Cable termination is same as that of Section 3 4 2 however remove the sheath of conductor 80 mm from the end Wiring method is also same as that of Section 3 4 1 Wiring for Abnormal Status Contact Output When an error see Table 4 2 occurs with an abnormality in the density meas
50. o 7 Sets density of calibration solution 2 Density data g cm for the 2nd calibration calibration solution 2 of two point calibration can be input As a rule the input density is data at the same reference temperature as that of 4 Note If relation between temperature and density is well known a density at a temperature can be input However the density data at the reference temperature which is same as that of 4 is recommended to achieve accurate calibration Function No 8 Sets temperature of calibration solution 2 Enter the temperature of calibration solution 2 of which density at the reference temperature is set at 7 Function No 9 Sets temperature coefficient of calibratio solution 2 Enter the value which is 100000 times the temperature coefficient g cm C of the calibration solution 2 Function No A Starts calibration 2 press SET key Pressing SET key executes 2nd calibration computation of two point calibration 3 Maintenance mode MAINT Mode for adjusting and checking operating conditions During this mode analog and digital outputs are held at the value just before holding Function No in maintenance mode is from 1 to D see table 4 1 Function No 1 Canceles protect enter 77 Function to avoid data changing due to carelessness When 0 is displayed a function No is not entered To release the protection display 77 and press SET
51. on varies with density value difference between pre calibration and after calibration The larger the difference is the longer the time is IM 12T03A01 02E 4 4 2 4 4 3 8 4 OPERATION 4 11 Note 2 The density value after calibration doesn t always coincide with the density of the standard solution 1 even if they are compared in the same temperature Especially when the solution temperature during calibration largely different from the reference temperature an error is apt to occur However the error is usually within allowable range if it is too large examine each set value The first calibration is finished by 7 Then use the standard solution 2 carry out the second calibration whose procedure is same as the first calibration Repeat the operations of 1 to 7 For the calibration computation set the function No to A CAL 2 display flashes seven times When the second calibration is finished purge the standard solution from the vibrator and screw the blind plug into the pouring port fully close the needle valves NV2 and NV3 and remove the connected air pipe Calibration with a Sample Calibration with sample liquid should be made according to the following procedure 1 Sample the measuring liquid which is measured 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
52. onal 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 requirements RECOMMENDED PRACTICE for Electrical Equipments for Use in Explosive Gas Atmosphere published by The Research Institute of Industrial Safety Ministry of Labor For FM Flameproof requirements National Electrical Code Chapter 5 Special Occupancies Labeling the Explosionproof Specifications TIIS Flameproof type of explosion protected construction The Model VD6DF density detector is labeled data plate on which type of the explosion protection constructions approval number symbols for the type and working ambient temperature range Table 4 1 TIIS Flameproof Type Explosionproof Construction of Vibration Density Detector Symbol for the type including Model and epdes Type Approval No explosion class and ignition group Model VD6DF N1 No T21726 d2G3 Model VD6DF S3 No T21727 d2G3 FM Explosionproof Specifications The Model VD6DF density detectors complying with FM explosionproof specifications is labeled data plate which is marked with an approval mark classification of hazardous location working ambient temperature range and handling cautions IM 12T03A01 02E 1 12 1 4 3 1 4 4 1 4 5 1 4 6 lt 1 GENERAL gt Installation Area and Ambient Conditions Model VD6DF density detector can be installed i
53. or E006 in the second calibration is displayed when calibration computation finishes examine the data input to function No 3 4 5 7 8 or 9 and repeat the computation using the incorrect data IM 12T03A01 02E 4 12 4 5 4 5 1 4 5 2 4 5 3 lt 4 OPERATION gt Operation Operation Procedure Start the density measuring system and monitor operating conditions for a while to confirm that there is no abnormality Adjustment for the density measuring system during operation is unnecessary however daily check of liquid flow rate and pressure is preferable When the steam tracing pipe is installed in the sampling unit do not heat the detector If an error indication is displayed make a countermeasure immediately Errors are listed in Table 4 2 Table 4 2 Error Table E004 Overrang of measuring temperature E005 Abnormal first calibration Check and reset the data required for E006 Abnormal second calibration calibration E007 Illegal data of EEPROM Check and reset the 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 006 occur only in the calibration mode and are displayed for one second when calibration computation finishes and are cleared After that the densit
54. or from humidity Checks the detector terminal box one or two times a year and replace the desiccant if humidity is detected Two desiccants are provided as accessories For the explosionproof detector confirm that there are no explosive gases using a gas detector before removing the terminal box cover IM 12T03A01 02E 5 2 5 MAINTENANCE 5 2 Troubleshooting Experiences are required for repair of the vibration type density meter after parts are replaced adjustment may be necessary If trouble occurs as a rule repair should be made by Yokogawa In this case detailed information on abnormal phenomena will be effective for speedy recovery Searching method for abnormality is explained below For the explosionproof detector confirm that there are no explosive gases using a gas detector before removing the terminal box cover 5 2 1 Checking the Vibrators Remove the cover of the detector so that the vibrator can be visually inspected 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 AN CAUTION The vibrator tube has extremely thin wall hence must be carefully handled Since assembling the vibrator tube requires special skill the exchange of the vibrator should be made by Yokogawa 5 2 2 Checking the
55. ortant factors in establishing flameproof properties Therefore service staff should be careful not to damage point surfaces and not to shock enclosures IM 12T03A01 02E 2 PRINCIPLES OF OPERATION 2 1 2 PRINCIPLES OF OPERATION 2 1 Measuring Principle 2 1 4 Density Detector Model VD6D Density Detector is a vibration type density meter Measuring principle is that the lateral free oscillation of a pipe is a function of the density of the liquid contained in the pipe Assuming that the pipe is filled with a liquid as shown in Figure 2 1 the lateral free oscillation of the pipe can be shown as the following equation D D Joint Joint Figure 2 1 Pipe Filled with Liquid C E Di Dz k ENE Ve m a 1 Px D12 D2 fx Free transfers oscillation frequency for px Hz C Constant determined by oscillation mode Oscillating pipe length m E Young s modulus of pipe kg m3 p Density of pipe material kg cm3 px Density of liquid measured kg cm3 D Pipe outside diameter m De Pipe inside diameter m In equation 1 the values other than f and p are determined by the pipe material and construction Thus the density p of the liquid can be obtained by measuring the free transfers oscillation frequency f x IM 12T03A01 02E 2 2 2 PRINCIPLES OF OPERATION 2 1 2 Density Converter The density converter computes the liquid density using the oscillation frequency signal
56. regardless of war ranty 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 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 abnormal Failure caused by any usage out of scope of recommended usage Any damage from fire earthquake storms and floods lightning disturbances riots warfare radiation and other natural changes Yokogawa does not warrant conformance with the specific application at the user site Yokogawa will not bear direct indirect responsibility for damage due to a specific application Yokogawa Electric will not bear responsibility when the user configures the product into systems or resells the product Maintenance service and supplying repair parts will be covered for five years after the production ends For repair for this product please contact the near est sales office described in this instruction manual IM 12T03A01 02E lt CONTENTS gt V Model DM8 Vibration Type Density Meter IM 12T03A01 02E 3rd Edition CONTENTS gt INTRODUC TION mu T i For the safe use of this equipment
57. s before if it is once released Measuring Liquid Flow Operating procedure for introducing sampling liquid is explained here assuming the piping in Figure 3 5 in Section 3 1 2 is equipped When pipe arrangement is different from that of Figure 3 5 carry out corresponding 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 unit as follows Ball valve BV 1 Fully closed Needle valve NV1 Fully closed Needle valve NV2 Fully closed Needle valve NV3 Fully closed Needle valve NVA Fully closed Stop valve V1 Fully closed Stop valve V2 Fully closed Note V1 and V2 marked by are used only for steam tracer 2 Forthe sampling conduit with the steam tracing pipe open the steam main valve to heat the sampling conduit Keep the stop valve V1 closed not heat the detector if it is not remarkably cooled 3 Prepare a sample receptacle liquid pan just under the drain valve provided in the sample conduit First fully open the drain valve then gradually open the tap valve When the sample liquid begins to flow out of the drain valve
58. 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 follows 1 Selectthe tap locations for the sample inlet and the sample return to make the pressure difference between them become at least 0 1 MPa 2 The pipe length between the sample inlet and the SAMPLE IN should not exceed 10 m Use stainless steel pipe of nominal diameter 15 mm or Sch 40 to 80 3 Install stop valves and drain valves near the sampling unit Main process pipe line Pin Pressure at inlet Pout Pressure at outlet 2 MPa Pin Sample conduits gt Pout 0 1 MPa 10 m max Tap valve Stop valve PX Drain valve Drain valve Sampling unit for vibration type density meter Figure 3 14 Sample Liquid Conduits 4 Avoid sharp bending of the pipe to prevent accumulation of sludge IM 12T03A01 02E 3 3 2 3 3 3 lt 3 INSTALLATION PIPING AND WIRING gt 3 11 Sampling unit 4 Sampling a Figure 3 15 Example of Wrong Piping Main pipe Sludge is likely to collect here Air Piping for Maintenance When cleaning the vibrator or calibrating the meter with standard solution blow away liquid from the vibrator by air pressure Air should be clean and dried with 0 3 to 0 5
59. the first calibration 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 approx 5 C and low temperature reference temperature approx 5 C the temperature coefficient should be calculated as following Temperature coefficient g cm C Density at high temperature Density at low temperature Difference between high and low temperatures Note 1 The density values should be those at the reference temperature as far as possible Set the mode transfer switch of the converter to CAL and input the data corresponding to function No 3 4 and 5 For specify the first calibration computation select the function No 6 and press SET key CAL 1 display flashes during computation and the density at the reference temperature is displayed after computation Confirm that the density value is almost the same as that of measured at 2 Before carrying out the second calibration change the density of the measuring solution in the sampling unit Perform the operations of 1 to 4 In the operation corresponding to 3 input the data to function No 7 8 and 9 In the operation corresponding to 4 use the function No A to specify calibration computation Calibration Error If an error indication E005 in the first calibration
60. the pressure up to 0 2 to 0 3 MPa to dry the inside of the vibrator 3 Pouring 18 to 20 ml of standard solution 1 into the vibrator avoiding air bubble entering it is described here Firstly remove the blind plugs from the pouring ports for the standard solution two places located on the detector base plate Secondly pour the standard solution into the pouring ort using the injector accessory so that the solution flows along the inner wall of the vibrator tube Using the pouring port near to the sample inlet is recommended If the injector is stained clean it with alcohol 4 Read the measured density value at the reference temperature It is displayed with the mode selector switch 3 set to DSPL and function No not displayed 5 Since calibration with standard solution 1 is made two times blow out the used standard solution from the vibrator Before blowing plug the pouring orts two places and blow air according to 2 6 Carry out the operations of 3 and 4 to confirm that the same results as that of 4 is achieved Note If the result differs from 4 repeat the operations of 3 and 4 7 Forthe calibration 1 computation press SET key at the function No 6 CAL 1 flashes during computation and the density at the reference temperature is displayed after the computation finishes Note 1 Check that this value is the correct density Note 2 of the standard solution 1 Note 1 Time for calibration computati
61. tion No display the density value at measuring liquid temperature No 1 or the measuring liquid temperature No 2 can be displayed by selecting function No Use FUNCTION key to select the FUNCTION No 2 Calibration mode CAL Mode for calibration Sets or specifies data required for calibration During this mode the analog and digital outputs are held at the values just before the holding However digital data output stops during calibration function No 6 or A When calibration computation ends holding is released and measured data are again output until function No 6 or A is transferred to another No IM 12T03A01 02E 4 4 lt 4 OPERATION gt Digital signal Note 1 Analog signal Measuring mode DSPL Maintenance mode 1 MAINT Transfer to Calibration mode Calibration start While in calibration computation Calibration end Calibration mode function No transfer or waiting for mode transfer 3 lt x Q v o o t c o w g 2 ni Oo Function ud transfer 2 Maintenance mode 3 oA yo 00e MAINT Measured x Measuring mode DSPL value value Note 1 The density value after temperature conversion density value at the measuring temperature and measuring liquid temperature are transmitted in digital form Only the density value after temperature conversion is transmitted in analog form Note 2 The density converter displays CAL 1 or CAL 2 Figure 4 3 Digita
62. uring 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 Wiring for Power Supply This wiring is to supply the converter with power Use shielded 2 conductor cable for wiring Cable termination and wiring method are the same as those for analog output signal in Section 3 4 2 Wiring for Grounding As a rule the case of the density detector and the density converter should be earthed The grounding terminal of the detector is located on the base for the mounting bracket and of the converter on the bottom of the case Perform wiring so that ground resistance is 100 O or less Class D using a wire of 2 mm nominal cross sectional area IM 12T03A01 02E 4 OPERATION 4 1 4 OPERATION 4 1 Component Names and Function 4 1 1 Density Detector Vibrator assembly Case Capacitance pickup electrode Oscillation amplifier Terminal box cover Coupler Vibrators Piezoelectric C v r element Lock screw Keep loose during detector operation Figure 4 1 Density Detector IM 12T03A01 02E 4 2 4 OPERATION gt 4 1 2 Density Converter Data Display Function No and data are displayed Front door Function No display Data display Fastener Nyratch
63. y at the reference temperature by the previous calibrating data is displayed Check of Measured Density Value It is recommended that measured density values are checked at intervals of several weeks to determine the period for calibration and cleaning 1 Measure the density using a hydrometer to compare it with the density indication at the reference temperature on the vibration type density meter When sampling the liquid check the pressure and the temperature are not largely different from those of the normal state 2 Measure density correctly at the reference temperature which is same as the sample liquid temperature 3 Compare the density measured at 2 with the displayed value when sampling the liquid If the difference of them exceeds the allowable error range clean the vibrator For cleaning procedure refer to Section 5 1 1 Shutdown When shutdown sample following steps and the vibration type density meter also stops drain the sample from the detector IM 12T03A01 02E 9 5 1 5 1 1 5 MAINTENANCE 5 1 MAINTENANCE Daily Inspection Maintenance Cleaning the Vibrator in the Detector Dirt particles may be deposited on the inner wall of the vibrator pipe depending upon the nature of the process liquid This can cause an error Clean the pipe at regular intervals in the following manner 1 Close valves BV1 and NV4 and open NV2 and NV3 2 Connectthe air pipe to the outlet of the needle valve NV

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