Yokogawa User's Manual Model VD6SM Sampling Unit For Vibration Type Density Meter

User’s Manual Model VD6SM Sampling Unit For Vibration Type Density Meter IM 12T3S1-01E R IM 12T3S1-01E 3rd Edition Blank Page i  INTRODUCTION The Model VD6SM sampling unit for the vibration type density meter is used for: • Controlling the properties (e.g., the flow rate and pressure) of measurement liquid to meet the specifications of the Model VD6D (or VD6DF) density detector. • Ensuring that the properties of measurement liquid is always in good condition and that normal operation is maintained.  Contents of This Manual and Related User’s Manual This user’s manual provides instructions on how to use the VD6SM sampling unit for the vibration type density meter and only related information in regard to the Model DM8 vibration type liquid density meter. Note: The Model DM8 vibration type liquid density meter consists of a density detector (e.g., Model VD6D or VD6DF), a density converter (Model DM8C) and a dedicated cable (Model DM8W). To use the Model VD6SM sampling unit for the vibration type density meter properly, read this manual thoroughly. As for the Model DM8 vibration type liquid density meter, refer to User’s Manual, IM 12T03A01-02E.  INSTRUCTIONS FOR USE CAUTION Restriction on application The Model VD6SM sampling unit for the vibration type density meter is not suited to be used for online measurement in the food industry due to its structure. Use of a flameproof detector When the meter is installed in an area where combustible gases may exist, the Model VD6DF flameproof detector should be used. For its use, restriction as a flameproof instrument should be strictly observed. For details of restrictions, refer to the user’s manual of the Model DM8 vibration type liquid density meter, IM 12T03A01-02E. High temperature and pressure measurement liquid Maximum temperature and pressure of the measurement liquid that can be supplied to the VD6SM sampling unit are 100 °C and 2 MPa, respectively. When high temperature and pressure liquid is supplied to the sampling unit, it is recommended that use of such liquid should be clearly indicated to draw maintenance engineers’ attention. Never supply high temperature and pressure liquid that exceeds the limitations. Steam trace When a steam trace piping is required, install it in accordance with Yokogawa engineer’s advice and the information described in this manual. Improper steam trace may cause measurement errors. Prohibition of modification Repair of the measurement liquid piping is subject to restoration to the original form. For part replacement, be sure to use the specified parts. Media No. IM 12T3S1-01E 3rd Edition : Jul. 2012 (YK) All Rights Reserved Copyright © 1988, Yokogawa Electric Corporation IM 12T3S1-01E ii  UNPACKING AND SPECIFICATION CHECK The VD6SM sampling unit includes the customer specified density detector (ordered separately) when shipped from the factory. The VD6SM weighs approximately 80 kg (varies depending on the specifications). It is recommended that the unit be unpacked near the installation location. CAUTION Instructions for Unpacking and Transportation The unit should be unpacked on a flat place while keeping it in a position of installation. (Avoid strong impact, e.g., overturn). Do not apply force to the piping, otherwise connection failure may result. After unpacking, ensure that the product received meets specifications. The specifications can be checked by the Model and Suffix Code indicated on the name plate at the front of the stand. For details of the Model and Suffix Code, refer to Section 1.3. Note: The specification of the density detector should be checked by the Model and Suffix Code indicated on the name plate on the terminal box. For details of the Model and Suffix Code, refer to User’s Manual, IM 12T03A01-02E. IM 12T3S1-01E  iii  For the safe use of this equipment  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 precautions for safety:  Notes on Handling User’s Manuals • Please hand over the user’s manuals to your end users so that they can keep the user’s manuals on hand for convenient reference. • Please read the information thoroughly before using the product. • The purpose of these user’s manuals is not to warrant that the product is well suited to any particular purpose but rather to describe the functional details of the product. • No part of the user’s manuals may be transferred or reproduced without prior written consent from YOKOGAWA. • YOKOGAWA reserves the right to make improvements in the user’s manuals and product at any time, without notice or obligation. • If you have any questions, or you find mistakes or omissions in the user’s manuals, please contact our sales representative or your local distributor.  Warning and Disclaimer The product is provided on an “as is” basis. YOKOGAWA shall have neither liability nor responsibility to any person or entity with respect to any direct or indirect loss or damage arising from using the product or any defect of the product that YOKOGAWA can not predict in advance. IM 12T3S1-01E iv  Symbol Marks Throughout this user’s manual, you will find several different types of symbols are used to identify different sections of text. This section describes these icons. WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. CAUTION Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe practices. IMPORTANT Indicates that operating the hardware or software in this manner may damage it or lead to system failure. NOTE Draws attention to information essential for understanding the operation and features. Tip This symbol gives information that complements the current topic. SEE ALSO This symbol identifies a source to be referred to. IM 12T3S1-01E v  After-sales Warranty  Do not modify the product.  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 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 nearest sales office described in this instruction manual. IM 12T3S1-01E Blank Page v Model VD6SM Sampling Unit For Vibration Type Density Meter IM 12T3S1-01E 3rd Edition CONTENTS  INTRODUCTION ...................................................................................................i  For the safe use of this equipment ..................................................................iii  After-sales Warranty ...........................................................................................v 1. 2. GENERAL .................................................................................................. 1-1 1.1 Standard Specifications ................................................................................... 1-1 1.2 Accessories ....................................................................................................... 1-1 1.3 Models and Suffix Codes ................................................................................. 1-2 1.4 External Dimensions ........................................................................................ 1-3 INSTALLATION, PIPING AND WIRING.................................................... 2-1 2.1 2.2 2.3 3. Installation ......................................................................................................... 2-1 2.1.1 Installation Area.................................................................................. 2-1 2.1.2 Installation .......................................................................................... 2-2 Piping ................................................................................................................. 2-3 2.2.1 Sampling line...................................................................................... 2-3 2.2.2 Steam Piping...................................................................................... 2-4 2.2.3 Cleaning Air Pipeline .......................................................................... 2-5 Wiring ................................................................................................................. 2-6 2.3.1 Special Cable ..................................................................................... 2-6 2.3.2 Wiiring Instructions............................................................................. 2-6 OPERATION .............................................................................................. 3-1 3.1 Names and Functions of Components........................................................... 3-1 3.2 Preparations for Operation .............................................................................. 3-2 3.3 3.4 3.2.1 Removing Shipping Parts from Density Detector .............................. 3-2 3.2.2 Inspecting Piping and Wiring Connections ........................................ 3-2 Start-Up .............................................................................................................. 3-3 3.3.1 Connecting Power ............................................................................. 3-3 3.3.2 Sampling Measurement Liquid .......................................................... 3-3 3.3.3 Calibration .......................................................................................... 3-4 3.3.4 Measuring the Pressure Compensation Valves ................................ 3-5 3.3.5 Operation Check for Complete Density Measurement System ........ 3-5 Normal Operation.............................................................................................. 3-6 3.4.1 Instructions for Operation................................................................... 3-6 3.4.2 Cleaning Strainer Element ................................................................. 3-6 IM 12T3S1-01E vi 3.4.3 Checking Measured Density Value.................................................... 3-7 3.4.4 Cleaning Vibrator in the Density Detector.......................................... 3-8 3.4.5 Cautions When Stopping the Operation ............................................ 3-8 3.4.6 Consumable Part Replacement ........................................................ 3-8 Customer Maintenance Parts List ...................................... CMPL 12T03S01-02E Revision Information ...............................................................................................i IM 12T3S1-01E 1-1 < 1. GENERAL > 1. GENERAL The Model VD6SM sampling unit for the vibration type density meter controls the flow rate and pressure of the liquid to be measured to meet the specifications of the Model VD6D (or VD6DF) density detector, and also provides an alarm if conditions are abnormal. 1.1 Standard Specifications External Dimensions: Approx. 400 (W) x 400 (D) x 1350 (H) mm Coating Finish: Epoxy resin, baked gray finish (equivalent to Munsell N7) Wetted Part Material: Stainless steel JIS SUS316, Teflon TM (gasket for flowmeter, pressure gauge and strainer), Ni for /FN option. Process Conditions: Inlet Temperature: 0 to 100°C Inlet Pressure: 0 to 1 MPa or 0 to 2 MPa Required Differential Pressure: Flow Rate: At least 0.1 MPa 1 to 10 l/min Weight: Approx. 80 kg Process connection: Screw, flange, or welding socket Density Detector Used with the Sampling Unit: Model VD6D and Model VD6DF. (Note) This sampling unit cannot be used with the Model VD6DS density detector. Ambient Temperature: -10 to 50°C (Note) Depends on the density detector specifications. Steam Tracing: Available Temperature: 1.2 I40 to 160°C Accessories Option code without /FN with /FN Part Name Part No. Quantity Strainer element K9727KX 1 SUS316 Description Gasket K9727KW 1 Teflon Strainer element K9727LC 1 Ni Gasket K9727KW 1 Teflon IM 12T3S1-01E 1-2 < 1. GENERAL > 1.3 Models and Suffix Codes Model Suffix Code Description VD6SM •••••••••••••••••••••••••••••••••• •••••••••••••••••• Sampling unit for Vibration type Density Meter (Note 1) Piping connection -JPT -10K -20K -150 -300 -151 -301 -WST •••••••••••••••••• •••••••••••••••••• •••••••••••••••••• •••••••••••••••••• •••••••••••••••••• •••••••••••••••••• •••••••••••••••••• •••••••••••••••••• Rc1/2 JIS 10K 15 RF Flange JIS 20K 15 RF Flange ANSI Class 150 1/2 RF Flange ANSI Class 300 1/2 RF Flange JPI Class 150 1/2 RF Flange JPI Class 300 1/2 RF Flange 1/2 inch welding socket •••••••••••••••••• •••••••••••••••••• •••••••••••••••••• •••••••••••••••••• 1 MPa 2 MPa Diaphragm type 1 MPa Diaphragm type 2 MPa Pressure guage range -PG10 -PG20 -PK10 -PK20 Temperature range Style code Option Material of strainer element (Note 1) (Note 2) (Note 3) IM 12T3S1-01E Option Code •••••••••••••••••• 0 to 100°C •••••••••••••••••• 0 to 150°C -T100 -T150 *B •••••••••••••••••• Style B /ST /FN With steam tracing (Note 2) Ni (Note 3) VD6SM Sampling unit is not including Detector. Order detector VD6D or VD6DF, separately. DM8C converter and special cable DM8W are also required for sampling system of density meter. If stean tracing is necessary, select the diaphragm type pressure guage. If measuring solution includes NaOH (≤30%) , select option code /FN of Ni. 1-3 < 1. GENERAL > 1.4 External Dimensions Unit : mm NV3 NV4 NV2 270 400 4 - ø15 holes For Anchor Bolts 50 50 300 400 Pressure Gauge Thermometer Detector 1350 Neeale Flow Meter Sample Outlet Sample Inlet NV1 strainer 200 34 Approx. 407 L L 100 200 (100) (for flange) (for welding socket) Model and Codes VD6SM - JPT - PG… 0 - T1 … 0 *B VD6SM - 10K - PG… 0 - T1 … 0 *B VD6SM - 20K - PG… 0 - T1 … 0 *B VD6SM - 150 - PG… 0 - T1 … 0 *B VD6SM - 300 - PG… 0 - T1 … 0 *B VD6SM - 151 - PG… 0 - T1 … 0 *B VD6SM - 301 - PG… 0 - T1 … 0 *B VD6SM - WST - PG… 0 - T1 … 0 *B Thermometer T Connection Type Rc 1/2 female JIS 10K 15 RF Flange JIS 20K 15 RF Flange ANSI Class 150 1/2 RF Flange ANSI Class 300 1/2 RF Flange JPI Class 150 1/2 RF Flange JPI Class 300 1/2 RF Flange 1/2 B Welding Socket L 0 100 100 100 100 100 100 100 Pressure Gauge Flow Meter NV4 P Needle Valve Ball Valve Sample Inlet strainer Needle Valve Needle Valve NV2 Needle Valve Detector NV3 NV1 Sample Outlet Fig. 1.1 VD6SM -    -PG  0- T1  0 *B Sampling Unit IM 12T3S1-01E 1-4 < 1. GENERAL > Unit : mm NV3 NV4 NV2 4 - ø15 holes 50 P - P view (Steam trace only) 400 For Anchor Bolts Steam Trap V2 50 300 V1 270 400 Note: Some detail of steam trace tube omitted in this drawings. Pressure Gauge Thermometer Detector 1350 Condensate Outlet Flow Meter P P 125 150 Steam Inlet Sample Outlet Sample Inlet NV1 150 strainer 200 34 Approx.407 L 100 L (100) 200 (for flange) (for welding socket) Model and Codes VD6SM - JPT - PK… 0 - T1 … 0 *B /ST VD6SM - 10K - PK… 0 - T1 … 0 *B /ST VD6SM - 20K - PK… 0 - T1 … 0 *B /ST VD6SM - 150 - PK… 0 - T1 … 0 *B /ST VD6SM - 300 - PK… 0 - T1 … 0 *B /ST VD6SM - 151 - PK… 0 - T1 … 0 *B /ST VD6SM - 301 - PK… 0 - T1 … 0 *B /ST VD6SM - WST - PK… 0 - T1 … 0 *B /ST Thermometer Pressure Gauge Flow Meter T Connection Type Rc 1/2 female JIS 10K 15 RF Flange JIS 20K 15 RF Flange ANSI Class 150 1/2 RF Flange ANSI Class 300 1/2 RF Flange JPI Class 150 1/2 RF Flange JPI Class 300 1/2 RF Flange 1/2 B Welding Socket b P b' Sample Inlet a Strainer Needle Valve NV2 Needle Valve Needle Valve Detector NV1 Sample a' Outlet b a V1 Stop Valve V2 Steam Inlet b' Condensate Outlet a' Steam Trap Fig. 1.2 VD6SM -    -PK  0- T1  0 *B / ST Sampling Unit IM 12T3S1-01E NV4 Needle Valve Ball Valve NV3 L 0 100 100 100 100 100 100 100 2-1 < 2. INSTALLATION, PIPING AND WIRING > 2. INSTALLATION, PIPING AND WIRING 2.1 Installation 2.1.1 Installation Area The model VD6SM sampling unit for vibration type density meter should be installed in an area: (1) Near to the sampling point. (2) Free from mechanical vibration. (3) Free from corrosive gases and dust. (4) Free from excessive humidity. (5) Not subject to large temperature variations. (6) If the unit is used in a hazardous area, the prescribed operating ambient conditions must be satisfied. In such a case, the Model VD6DF Density detector is used. WARNING Restrictions When Installed in a Hazardous Area A sampling unit including the VD6DF flameproof density detector can only be installed in a hazardous area. The flameproof specification of the VD6DF density detector is TIIS d2G3 or NEC Class I, Division 1, Groups C and D. Install the detector in an environment that meets these flameproof specifications. IM 12T3S1-01E 2-2 2.1.2 < 2. INSTALLATION, PIPING AND WIRING > Installation Normally, the sampling unit for the vibration type density meter is securely fixed to a well drained concrete base (see Figure 2.1). When the unit might be exposed to the rain or direct sunlight, it should be installed in a shelter. Density meter sampling unit Anchor bolt Drain pit Concrete base Figure 2.1 IM 12T3S1-01E Installation Example < 2. INSTALLATION, PIPING AND WIRING > 2.2 2-3 Piping The sampling unit for vibration type density meter requires the following piping: (1) Sampling line (2) Steam piping However, the steam piping is necessary only when steam tracing is carried out. If necessary, perform air piping as described in Sec. 2.2.3. 2.2.1 Sampling line The sampling line transports the liquid to measure to the sampling unit. The main process pipe is provided with a sample inlet and outlet. The sample conduit from the sample inlet is connected to “SAMPLE IN” of the sampling unit, and the sample conduit from the outlet to “SAMPLE OUT” of the sampling unit. The piping procedure is as follows: (1) The sample inlet and the sample outlet should be selected such that the pressure difference of the liquid measured is at least 0.1 MPa. (2) The pipe length at the sample inlet side should not exceed 10 m. (3) Install tap and drain valves near the sampling unit (See Figure 2.2). Main process pipe line Pin (Pressure at inlet) Pout (Pressure at outlet) 2 MPa>Pin • Pout + 0.1 MPa Sample conduits (10 m max.) Tap valve Drain valve Stop valve Drain valve Sampling unit for vibration type density meter Figure 2.2 (4) Sample Line Connections Avoid bending the pipe, or sludge may accumulate (See Figure 2.3). Sampling unit Main pipe Sampling line Sludge is likely to collect here. Figure 2.3 Example of Unsatisfactory Piping IM 12T3S1-01E 2-4 2.2.2 < 2. INSTALLATION, PIPING AND WIRING > Steam Piping This piping is required when the viscosity or fluid point of the liquid measured is high and the fluidity must be increased. In this case, a tracer pipe is attached to the sampling unit. The steam piping connects the steam heating source and the sampling unit “STEAM IN” inlet. The sample conduit should be provided with a tracer pipe to which steam should be supplied. A steam source of pressure 0.3 to 0.5 MPa and temperature 140 to 160 ºC is recommended. The tracer pipe should be laid along the sampling line. Carried out after pressure leakage tests for the sampling line have been completed. For piping observe the following items: (1) The tracer pipe for the sample conducts should be installed such that all the piping is heated. The pipe should also be wrapped with insulating material (See Figure 2.4). Heat insulating material Trace pipe Sampling line Figure 2.4 (2) Steam Trace Section The end of the “CONDENSASTE OUT” pipeline of the sampling unit should be open to the atmosphere (See Figure 2.5). Steam trap Sampling unit Drain pit Figure 2.5 IM 12T3S1-01E Piping at Steam Trap Discharge Side < 2. INSTALLATION, PIPING AND WIRING > 2.2.3 2-5 Cleaning Air Pipeline When a liquid which may stain the vibrator – stain on the vibrator results in measurement error – is being measured in the density detector, periodical vibrator cleaning is required. When cleaning the detector or when calibrating the density detector using standard solution instead of the liquid to be measured, air is used to discharge the liquid in the vibrator. If no air supply is available in the vicinity of the sampling unit installation area, it is recommended that you pipe air to the installation area. The cleaning air pipe should be connected to the sampling unit only when vibrator cleaning or when calibration using standard solution is being carried out. For the pipe for the air supply (clean dry air with pressure 0.3 to 0.5 MPa G), a stop valve and a reducing valve should be provided near the sampling unit, and a flexible, tube should be used to connect to the steel pipe (outside diameter 10 mm). Sampling unit BV1 DD NV2 NV4 NV3 Connect when cleaning the density detector Air supply 0.3 to 0.5 MPa G Flexible tube Figure 2.6 Reducing Stop valve valve Cleaning Air Piping IM 12T3S1-01E 2-6 < 2. INSTALLATION, PIPING AND WIRING > 2.3 Wiring A special cable for the Model DM8C Density Converter is connected to the Model VD6SM sampling unit for the vibration type density meter. 2.3.1 Special Cable The length of the special cable is as specified, and the cable end finishing (termination) is provided as shown in Figure 2.7. When wiring, be careful not to stain or wet the cable end parts. If the cable is too long, adjust the cable length by coiling the cable at the converter end, without cutting the cable. Density converter Density detector B4 WHITE B4 WHITE GRAY B5 B5 GRAY A2 RED A2 RED A3 BLUE A3 BLUE A4 YELLOW A4 YELLOW A5 GREEN A5 GREEN A6 BROWN Figure 2.7 2.3.2 A6 BROWN Special Cable Wiiring Instructions The wiring between the density detector and the density converter using the special cable is shown in Figure 2.8. Usually, the cable connected to the density detector is protected with a flexible fitting at the detector cable inlet and from there to the cable duct. The cable is protected with a wire-reinforced-tube. Detector Special cable Converter A2 RED A2 N.C A3 BLUE A3 C A4 YELLOW A4 A6 BROWN A6 A5 GREEN A5 B4 B5 WHITE GRAY SG RD TD B5 L1 L2 + + - Power supply IM 12T3S1-01E Wiring Diagram RS-232-C signal B4 G Figure 2.8 Alarm Closed when a failure is detected or the power fails. ‡Density signal after being converted to the reference temperature state ‡Density signal before being converted to the reference temperature state ‡7HPSHUDWXUHVLJQDO 0 to 1 V DC 4 to 20 mA DC Density signal after being converted to the reference temperature state < 2. INSTALLATION, PIPING AND WIRING > 2-7 Wiring for Non-explosionproof Type Density Detector The cable inlet of the density detector is located at the bottom of the terminal box. Through this cable inlet, the special cable is fed into the terminal box (remove the cover) and each cable core wire should be connected to the correct terminals as shown in Figure 2.9. The terminal box cover can be removed using the wrench supplied with the density detector. Figure 2.9 Density Detector Terminal Connections Figure 2.10 Wrench to Open/Close Terminal Box Cover The conduit connecting screw at the cable inlet of the device is G3/4 Female. Use a proper flexible fitting with this screw to protect the cable. Cable Terminal box case Lock nut Nut G3/4 screw Flaxible fitting Figure 2.11 Cable Conduit Connections IM 12T3S1-01E 2-8 < 2. INSTALLATION, PIPING AND WIRING > Wiring for Explosionproof Density Detector The explosionproof density detector conforms to either TIIS flameproof or FM explosionproof specifications. The TIIS type is certified to be explosionproof by the Labor Safety and Sanitation Law (Japan) which regulates domestic explosion-protected electrical equipment. The FM type is certified to have an explosionproof construction meeting the requirements of NEC (National Electrical Code) by FM (Factory Mutual Research Corporation, U.S.A.). Use flameproof, metal conduit wiring for explosionproof density detectors. The conduit connecting screw thread at the cable inlet of each device is either G3/4 female (TIIS explosionproof) or 3/4NPSM (FM explosioprotection). Use a proper explosionproof flexible fitting to protect the cable and to maintain the explosioproof capability. Cable Terminal box case Be sure to screw in at least 12 mm (5 threads) Lock nut G3/4 screw (TIIS explosionproof) 3/4NPSM (FM explosionproof) Explosionproof flaxible fitting Figure 2.12 IM 12T3S1-01E Explosionproof Flexible Fitting Connection 3-1 < 3. OPERATION > 3. OPERATION 3.1 Names and Functions of Components An external view of the sampling unit for the vibration type density meter with steam tracer is shown in Figure 3.1. However, in the figure, the tracer pipe including heat insulating tape is omitted. The valves “V1”, “V2” and the steam trap “ST1” are not provided with the general type sampling unit for vibration type density meter. Thermometer (T) Pressure gauge (P) Needle valve (NV2) Ball valve (BV1) Drain Needle valve (NV3) Density detector Needle valve (NV4) Drain Pressure gauge pressure element Flowmeter (FM) Valve (V1) For density detector steam heating Valve (V2) For steam tracer in sampling unit piping Needle valve (NV1) Flow rate adjustment for measuring liquid flowing through the density detector Thermometer sensor Steam trap (ST1) Stariner (F) Figure 3.1 Names and Functions of the Sampling Unit for Vibration Type Density Meter (with Steam Tracer) IM 12T3S1-01E 3-2 < 3. OPERATION > 3.2 3.2.1 Preparations for Operation Removing Shipping Parts from Density Detector To prevent possible damage during transportation, the vibrator assembly is separated from the oscillation amplifier case by a rubber sheet. Before the unit is installed this rubber sheet should be removed. The rubber sheet is inserted between the case and the vibrator assembly coupler. The procedure is as follows: (1) Removing detector mainframe cover. First, loosen the lock screw with an Allen wrench (supplied with the density detector) and remove the clamp. Turn the cover counterclockwise, then pull the cover straight down, taking care that it does not bit the internal assembly. (2) Remove the vibrator assembly cover (contains desiccant). NOTE The vibrator is made of a pipe with very thin wall. Be careful not to dent or scratch it, otherwise it will not function properly. (3) Loosen the vibrator lock screw. Use a flat blade screwdriver to turn the screw fully counterclockwise; If the screw contacts the vibrator assembly during operation, invalid measurements will result. The vibrator is a pipe with thin wall. Hence, take care not to dent or damage the assembly. (4) Remove the rubber sheet. Pull it out, taking care not to apply excessive force to the vibrator assembly. 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 3.2 (5) Shipping Rubber Sheet Removal Reassemble the cover removed in step (2), above. Then securely screw the cover removed in step (1) above, onto the case assembly and lock it. The removal of the rubber sheet is now completed. Save the removed rubber sheet: it is required when shipping/transporting the density detector. 3.2.2 Inspecting Piping and Wiring Connections Inspect the piping such as sample piping and all the wiring including the density converter or recorder to confirm that they have been completed and they are in good condition. If the density detector terminal box cover is removed for inspection, replace the cover after the inspection and securely tighten it. IM 12T3S1-01E 3-3 < 3. OPERATION > 3.3 Start-Up In some cases, the density detector and the density converter – components of the vibration type density meter – are installed at a distance from each other. Also, recorders and the like which receive the density converter output signal may be installed at a distance from the density converter. This section explains how to start up the unit. However, in some descriptions, these components are assumed to be located close to each other, so where necessary rewrite the procedure so that startup can be performed efficiently. 3.3.1 Connecting Power Connect a power supply whose voltage and frequency are as specified for the density detector and recorder for the output signal of the density detector. For recorders and the like which output control signals, be careful that they do not cause abnormal operation. 3.3.2 Sampling Measurement Liquid Pass the liquid to be measured through the sampling unit as follows: (1) Set the sampling unit values as follows: Ball valve “BV1”: Fully closed, Needle valve “NV1”: Fully closed Needle valve “NV2”: Fully closed, Needle valve “NV3”: Fully closed Needle valve “NV4”: Fully closed *Stop valve “V1”: Fully closed, *Stop valve “V2”: Fully closed (Note) The valves V1 and V2 with * mark are only provided in the sampling unit with steam tracer. T b P b' NV4 BV1 Sample Inlet FM F a NV2 NV3 DD NV1 Sample a' Outlet b V1 a V2 Steam Inlet b' Condensate Outlet Figure 3.3 (2) a' ST1 T: Thermometer BV1: Ball Valve P: Pressure Gauge NV1 to NV4: Needle Valve F: Strainer FM: Flow Meter DD: Detector V1, V2: StopValve ST1: Steam Trap Flow Diagram of the Sampling Unit for Vibration Type Density Meter (with Steam Tracer) When sampling lines are provided with steam tracer pipes, open the steam main valve to heat the sample conduits. Fully open the stop valve “V2” to heat the piping in the sampling unit. Leave the stop valve “V1” for heating the density detector fully closed unless the density detector is very cold. IM 12T3S1-01E 3-4 < 3. OPERATION > (3) Set a vessel to receive the liquid to be measured under the drain port provided for the sample inlet pipe. Fully open the drain-valve, than tap valve. When the liquid to be measured flows out of the drain, close the tap valve. (4) Carry out the same operation as described in (3) above for the sample outlet pipe. (5) Fully open the ball valve “BV1” and the needle valve “NV4”, half open the needle valve “NV1”, and close the drain valve which was opened in (3) above. Gradually open the tap valve of the sample inlet pipe. The liquid to be measured flows out of the drain port provided for the sample outlet pipe. So that air is not mixed in the liquid to be measured, fully close the stop valve of this piping and fully close the drain valve simultaneously. (6) To remove the remaining air in the piping, open the needle valve “NV2” and let the liquid to be measured flow out of the drain port at the end of this valve. Then, close the valve. (7) Adjust the flow rate of the liquid to be measured flowing through the density detector, by controlling the opening of the needle valve “NV1”. Normally, the flow rate is adjusted to approximately 5 l/mm. The indication valve of the flowmeter “FM” is, as shown in Figure 3.4, affected by the viscosity of the liquid to be measured, so for liquids of high viscosity the indicated flow rate is higher than the actual flow rate. $FWXDOIORZUDWHPHDVXUHPHQWOLTXLGGHQVLW\ȡ  F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 ,QGLFDWLRQRIIORZPHWHUOPLQ      Figure 3.4 3.3.3    $FWXDOIORZUDWHOPLQ  Flow Rate Characteristics vs. Measurement Liquid Viscosity (8) Check to confirm that neither the thermometer “T1” nor the pressure gauge “P1” in the sampling unit displays an abnormal valve (e.g. a valve exceeding the operating conditions). (9) Carry out visual inspection to confirm that there is no leakage of the liquid to be measured from any pipe connection parts. Calibration To calibrate the vibration type density meter, see a separate User’s Manual IM 12T03A01-02E, Section 4.4 “Calibration”. IM 12T3S1-01E 3-5 < 3. OPERATION > 3.3.4 Measuring the Pressure Compensation Valves When the calibration is carried out with standard solution, the pressure compensation valves should be carried out as follows: (1) Fully open the needle valve “NV4” and read the pressure gauge “P1” indication valve. (2) Next, fully close the ball valve “BV1”, then open the needle valve “NV3” to set the pressure of the liquid to be measured in the density detector to atmospheric pressure (0 MPa G). Read the measured density valves under the two pressures described above (P1 and atmospheric pressure) and obtain the pressure compensation valves as described in the other user’s manual “Model DM8 Vibration type Density Meter ─ Pressure Compensation”. 3.3.5 Operation Check for Complete Density Measurement System Operate the complete density measurement system under normal operating conditions. Observe the system operation for a while to check for abnormal conditions. The following items for must be checked: (1) No measurement liquid leakage from piping connection. (2) No air mixed in the measurement liquid and no disturbance in the measured valve. (3) The temperature of the liquid to be measured is within the specified temperature range e.g. near the reference temperature (within ±10 ºC). (4) No large pressure variation of the liquid to be measured. (5) The flow rate of the liquid to be measured is satisfactory and the necessary response time required for the unit to operate well is obtained. IM 12T3S1-01E 3-6 < 3. OPERATION > 3.4 Normal Operation Normally, the sampling unit requires no adjustment during operation, however, to keep the unit in good operating condition, daily check to confirm that the flow rate and pressure of the liquid to be measured are normal. The fo11owing instructions explain the inspection and maintenance to be carried out in normal operation of the unit. 3.4.1 Instructions for Operation No special care is required when the general use sampling unit for the vibration type density meter is used. However, when the sampling unit for vibration type density meter with steam tracer is used, be carefu1 not to heat the density detector. Always leave the stop valve “V1” fully closed. The stop valve for the steam tracer piping in the sampling unit should be fully opened. 3.4.2 Cleaning Strainer Element If the strainer element in the strainer assembly becomes clogged with dust, the flow rate of the liquid to be measured flowing into the density detector decreases and the indication value of the flowmeter “FM” decreases even though there has been no change in viscosity of the liquid to be measured. The decrease in the flow rate can be somewhat compensated by opening the needle valve “NV1” a little, however, ideally, the decreased flow rate due to clogging of the strainer element should be corrected by cleaning the strainer element. Clean the strainer element as follows: (1) Stop the flow of liquid to be measured. First, fully close the tap valve provided for the sample inlet pipe. Next, fully close the stop valve provided for the sample outlet pipe. If steam tracing is being carried out, stop the steam flow. (2) Drain the liquid to be measured from the sampling unit. Set a vessel under the drain port provided for the sample inlet pipe, and open the drain valve of this pipe and the needle valve “NV2” in the sampling unit. (3) Remove the strainer element. First, fix the strainer body using a spanner and at the same time loosen the lower side nut of the strainer. Take the gasket and strainer element out of the strainer assembly. IM 12T3S1-01E 3-7 < 3. OPERATION > Strainer Element Gasket Nut of lower side Strainer to Flowmeter Connector Thermometer sensor Figure 3.5 (4) Strainer Assembly Construction Clean the strainer element. Using an appropriate solvent and taking care not to damage the mesh, remove the dust attached to the strainer element. 3.4.3 (5) Set the strainer element and gasket back in the strainer assembly, tighten the lower side nut of the strainer. (6) Start the liquid to be measured flowing through the sampling unit again according to section 3.3.2. Checking Measured Density Value To get an idea of how often the unit will need to be calibrated or cleaned, it is recommended that you check the measured density value as follows every few weeks. (1) Collect as sample of the liquid to be measured and measure its density with a standard hydrometer. When collecting the sample, confirm that the sample pressure and temperature are similar to those during normal operation. Record the density reading of the vibration type density meter on a recorder. (2) Accurately measure the density of the sample collected in (1) above. (3) Compare the density value measured in (2) above with the density value which was displayed on the vibration type density meter and recorded in (1) above. IM 12T3S1-01E 3-8 < 3. OPERATION > If the difference between these values exceeds the maximum allowable error, clean the vibrator in the density detector. 3.4.4 Cleaning Vibrator in the Density Detector Clean the vibrator as fo11ows: (1) Close the ball valve “BV1” and the needle valve “NV4” in the sampling unit, and open the needle valves “NV2” and “NV3”. (2) Clean the vibrator referring to the other instruction manual “Model DM8 vibration type liquid density measuring system” section 5.1.1 “Cleaning Vibrator”. (3) Close the needle valves “NV2” and “NV3” and fully open the ball valve “BV1” and the needle valve “NV4” to start the liquid to be measured flowing through the density detector. Purge the remaining air in the piping from the drain on the needle valve “NV2” side. (4) 3.4.5 Check the measured density value of the vibration type density meter according to section 3.4.3. If the difference between the measured values of the vibration type density meter and the measured value of the standard hydrometer exceeds the allowable range, recalibrate the unit. Cautions When Stopping the Operation When stopping flow of the liquid to be measured and when the sampling unit is not in operation, as a rule, drain the measurement liquid as follows. (1) Close the tap valve provided for the sample inlet pipe and the stop valve provided for the sample outlet pipe. Next close the drain valves provided for these pipes. A part of the liquid to be measured in the sampling unit will flow out of each drain valve. If required, a vessel to receive the liquid to be measured should be prepared under each drain port. (2) Drain the liquid to be measured in the sampling unit as far as possible. First, open the needle valve “NV2”. Next, fully close the ball valve “BV1”, connect the pneumatic piping to the drain port at the needle valve “NV2” side, and apply a pressure of 0.1 to 0.2 MPa of air to the unit for several minutes. (3) If the liquid to be measured may stick to the inside of the vibrator, clean the vibrator. If required, inject an appropriate solvent into the vibrator. (4) Fully close the drain valves of the sample conduits. The needle valve “NV2” should be slightly open. When the sampling unit with steam tracer is used, always full close the stop valves “V1” and “V2”’. 3.4.6 Consumable Part Replacement The Model VD6SM Sampling unit for vibration type density meter contains no consumable parts which must be replaced periodically. For the strainer assembly, which may have to be comparatively frequently replaced, a strainer element and on gasket are provided as spare parts with the unit, so when cleaning the unit carry out visual inspection and if they are damaged, replace them. Should any failure occur during long term usage, replace the failed part as soon as possible. IM 12T3S1-01E Customer Maintenance Parts List Model VD6SM*B Sampling Unit for Vibration Type Density Meter 1 2 3 4 10 5 6 5 7 5 8 9 9 8 11 12 ©Copyright Aug. 2005, 1st Edition: Aug, 2005 (YK) Subject to change without notice. CMPL 12T03S01-02E 2 2 3 4 5 Part No. L9868AP L9868AQ Y9512JU Y9500WU Y9501BU L9852CB 6 7 8 9 L9854BX – L9866BV L9852CA 10 11 12 1 1 6 12 6 4 1 1 6 12 6 4 Description Thermometer (0 to 1008C) Thermometer (0 to 1508C) Screw Washer Nut Needle Valve 1 1 1 1 1 1 2 Ball Valve Density Detector (see CMPL 12T3E1-01E) Flowmeter Stop Valve 1 1 Pressure Gauge 0 to 1 MPa 0 to 2 MPa 0 to 1 MPa 0 to 2 MPa – 1 L9867BV 1 L9867BW 1 L9867BX L9867BY L9865AE – K9727KK K9727LG Note *1 Note *2 Note *2 Item 1 Model Note *1 Qty 1 1 1 1 1 Steam Trap Strainer Assembly (for details see below) with SUS316 element with Ni element (option code: /FN) Model VD6SM - uuu - Puu0 - T1u0 *B Model VD6SM - uuu - Puu0 - T1u0 *B /ST Item 12 Strainer Assembly 1 2 Qty *1 *2 K9727KX 1 K9727LC 1 K9727KW 1 1 Item Part Name Part No. 1 Element 2 Gasket Description SUS316 Ni Teflon TM (Note) *1 Model VD6SM - uuu -Puu0- T1u0 *B *2 Model VD6SM - uuu -Puu0- T1u0 *B /FN 1st Edition: Aug, 2005 (YK) CMPL 12T03S01-02E i Revision Information  Title  Manual No. : Model VD6SM Sampling Unit For Vibration Type Density Meter : IM 12T3S1-01E Jul. 2012/3rd Edition Page layout changed by InDesign P. 1-1 Standard specifications equalized to GS; P. 2-3 Pressure value of Figure 2.2 modified, etc. Oct. 2006/2nd Edition Style change from *A to *B. Mar. 1988/1st Edition Newly published  If you want to have more information about Yokogawa products, you can visit Yokogawa’s home page at the following web site. Home page: http://www.yokogawa.com/an IM 12T3S1-01E Blank Page