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WEDGE Flow Meter Type WM Differential Pressure – Primary Flow Element

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WEDGE Flow Meter Type WM Differential Pressure – Primary Flow Element User Guide OI/WMP/C/F-EN WEDGE flow meter type WM Differential pressure – primary flow element Introduction WEDGETM flow elements utilize V-shaped restrictions to produce a square root relationship between differential pressure and volumetric flow. Elements are designed for either clean or dirty service and are offered in various materials, pipe sizes, and pressure ratings. The differential pressure is measured by a differential pressure transmitter. Various process connections on the WEDGE are provided for either pneumatic or electronic transmitters or other differential pressure sensing devices. Wedge meters can be flow calibrated and supplied with a factory calibration report, this includes calculations for the user’s process when such data is supplied. The differential pressure measurement is used to calculate flow using a standard wedge flow equation. WEDGE flow meter type WM Differential pressure – primary flow element Contents Contents 1 Safety ...............................................................................2 1.1 Health & Safety .........................................................2 1.2 Electrical safety – CEI / IEC 61010-1:2001-2 ............2 1.3 Symbols – CEI / IEC 61010-1:2001-2 ......................2 1.4 Pressure equipment safety .......................................3 1.5 User guidelines .........................................................3 1.6 Permissible process media (fluids) ............................3 1.7 Technical limit values ................................................3 1.8 Safety precautions ....................................................3 1.9 Potential safety hazards ............................................3 2 Introduction .....................................................................4 2.1 General ....................................................................4 2.2 Model WMP – Clean Service ....................................4 2.3 Models WMF and WMC – dirty service .....................4 2.4 Accuracy ..................................................................5 2.5 Maximum working pressure ......................................5 2.6 Maximum working temperature ................................5 3 Installation .......................................................................6 3.1 Selecting a mounting location ...................................6 3.2 Straight pipe run requirements ..................................6 3.3 Installation and differential pressure connections ......7 3.3.1 General .........................................................7 3.3.2 Line installation ..............................................7 3.3.3 Differential pressure connections ...................7 3.3.4 Pipe connections ..........................................8 4 Mounting dimensions ......................................................9 4.1 Model WMF with flanged tapping connection ...........9 4.2 Model WMC chemical tee connections with SO end flanges – sizes 15 to 80 mm (1/2 to 3 in.) ...............11 4.3 Model WMC with chemical tee tapping connections and RFWN end flanges – sizes 100 to 600 mm (4 to 24 in.) ...........................12 4.4 Model WMP with RFWN end flanges – sizes 50 to 150 mm (2 to 6 in.) ........................................................13 5 Start-Up .........................................................................15 5.1 Operation ...............................................................15 5.1.1 Zero check ..................................................15 5.1.2 Span check .................................................15 5.2 Accuracy ................................................................15 6 Maintenance ..................................................................15 6.1 Removing element from service ..............................15 6.2 Inspection ..............................................................15 6.3 Reinstallation ..........................................................15 7 Spares ............................................................................16 Notes ..................................................................................17 1 OI/WMP/C/F-EN WEDGE flow meter type WM Differential pressure – primary flow element 1 Safety 1 Safety Information in this manual is intended only to assist our 1.3 Symbols – CEI / IEC 61010-1:2001-2 customers in the efficient operation of our equipment. Use of One or more of the following symbols may appear on the this manual for any other purpose is specifically prohibited and equipment labelling: its contents are not to be reproduced in full or part without prior approval of the Technical Publications Department. Protective earth (ground) terminal. 1.1 Health & Safety Health and Safety Functional earth (ground) terminal. To ensure that our products are safe and without risk to health, the following points must be noted: Direct current supply only. The relevant sections of these instructions must be Alternating current supply only. read carefully before proceeding. Warning labels on containers and packages must be Both direct and alternating current supply. observed. The equipment is protected through double Installation, operation, maintenance and servicing insulation. must only be carried out by suitably trained personnel and in accordance with the information given. This symbol, when noted on a product, indicates a Normal safety precautions must be taken to avoid the potential hazard which could cause serious personal possibility of an accident occurring when operating in injury and / or death. conditions of high pressure and / or temperature. The user should reference this instruction manual for Chemicals must be stored away from heat, protected operation and / or safety information. from temperature extremes and powders kept dry. Normal safe handling procedures must be used. This symbol, when noted on a product enclosure or barrier, indicates that a risk of electrical shock and / When disposing of chemicals ensure that no two or electrocution exists and indicates that only chemicals are mixed. individuals qualified to work with hazardous voltages should open the enclosure or remove the barrier. Safety advice concerning the use of the equipment described in this manual or any relevant Material Safety This symbol indicates that the marked item can be datasheets (where applicable) may be obtained from the hot and should not be touched without care. Company address on the back cover, together with servicing and spares information. This symbol indicates the presence of devices sensitive to electrostatic discharge and indicates that 1.2 Electrical safety – CEI / IEC 61010-1:2001-2 care must be taken to prevent damage to them. This equipment complies with the requirements of CEI / IEC This symbol identifies a risk of chemical harm and 61010-1:2001-2 'Safety Requirements for Electrical Equipment indicates that only individuals qualified and trained to for Measurement, Control and Laboratory Use' and complies work with chemicals should handle chemicals or with US NEC 500, NIST and OSHA. perform maintenance on chemical delivery systems If the equipment is used in a manner NOT specified by the associated with the equipment. Company, the protection provided by the equipment may be impaired. This symbol indicates the need for protective eye wear. This symbol indicates the need for protective hand wear. Electrical equipment marked with this symbol may not be disposed of in European public disposal systems. In conformity with European local and national regulations, European electrical equipment users must now return old or end-of-life equipment to the manufacturer for disposal at no charge to the user. OI/WMP/C/F-EN 2 WEDGE flow meter type WM Differential pressure – primary flow element 1 Safety Products marked with this symbol indicates that the 1.6 Permissible process media (fluids) Process media may be used only if: product contains toxic or hazardous substances or elements. The number inside the symbol indicates It can be assured that the physical and chemical the environmental protection use period in years. properties of the pressure-bearing materials that come into contact with the process medium are not reduced from that required for operational safety, during the 1.4 Pressure equipment safety expected lifetime of the equipment. Warning. Process media with unknown properties for erosion and/or corrosion may be used only if the operator can The pressure equipment described in this manual is perform regular and suitable tests to assure the safe supplied, where appropriate, in accordance with the condition of the equipment. European Directive 97/23/EC and is designed to work in pressurized systems. Take care when installing all 1.7 Technical limit values equipment and follow the instructions given. Failure to The equipment is intended for use only within the technical limit do this could result in damage to equipment and values specified on the data plate and in the datasheet, create possible hazards to operators and other including those for: equipment. Only use the equipment on the process The maximum working pressure. for which it is designed. Install the equipment into a system that has been designed to allow for venting or The maximum and minimum operating temperatures. draining of the process. For the necessary safety The maximum vibration level stated in the datasheet. requirements refer to the appropriate instructions in this manual. In addition, all connected pipework must be installed as it was Do not exceed
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