Orifice Plate Flow Meter

Transcription

1 Orifice Plate Flow Meter FOFT

2 Measuring Principle The principle of measuring the differential pressure is based on the fact that a differential pressure is created across that section of a pipe where its cross section is reduced. This is then taken as a measure for the flow. For the differential pressure produced (differential pressure p at the point where the pressure is read) and the flow q, the flowing equation applies: This principle of measurement is so popular because related terms, definitions and equipment characteristics have been laid down by way of standards already at a very early stage. The agreement between theoretical calculations and measured values has been proven through comprehensive experiments. This has been the basisfor wide-spread acceptance throughout the industry. Today, about 50% of all flow meters rely on the principle of measuring the differential pressure.

3 The Teksens Compact Orifice Flowmeter Series is designed for closed loop control and general purpose monitoring applications. This design lowers the total installed cost of DP Flow measurement points eliminating the need for fittings,impulse tubing, valves, adapters and manifolds by providing a single device packaged together for simplified installation. By integrating Autrol pressure transmitters with the Compact Orifice primary element,we deliver the highest performing Flowmeters which arrive assembled, calibrated,pressure tested, and ready to install. Electrical Safety This equipment complies with the requirements of CEI/IEC : 'Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use'. If the equipment is used in a manner NOT specified by the Company, the protection provided by the equipment may be impaired. Symbols One or more of the following symbols may appear on the equipment labelling:

4 General Safety Information

5 Installation

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8 Switch Positions Valve Manifold

9 Wiring method is following this. (1) Open the housing cover indicated "FIELD TERMINAL". In explosion environment when circuit is powered on, don't open the covers. (2) Connect the power supply in the terminal indicated "+PWR"(left terminal) and "-" power supply in the central terminal. Don't connect "+" power supply in "+" terminal of the point indicated "TEST". It will be damage to test diode used to connecting TEST terminal. (3) Seal and close the non-using Conduit Connection Part for severe humidity and explosion on the terminal box of housing. (4) Transmitter power is supplied to Signal Wiring. So, don't install near to Signal Wiring with Power Wiring or near to Power Apparatus. In case of ground signal, ground the signal loop's one side and other side is not grounded. Promote to ground "-" side of power. (5) For the better adjustment completely turn Screw terminal. (6) Again close the transmitter cover. Specially in case of using in explosion area, you must to satisfy requirement about explosion. Don't supply high voltage (AC power) in transmitter leads. It can be caused damages to transmitter. (7) You have to connect 250~600 W Loop Resistor in Current Loop(between Power Supply and Transmitter) for HART Communication HART. Following Figure 4-2 about conection of Current Loop. Figure 4-2 Connection with Terminal Board of Transmitter

10 Specifications Measurement range Output m³/h gas/vapour 0, m³/h for liquids 4-20 ma, HART (Profibus, Field Bus upon request) Deviation of the measurements ± 0,8 % of meas. value for dry calibration (>= DN 50) ± 0,6 % of meas. value for wet calibration Conditions of usage as to the conditions of usage the guidelines of ISO 5167 must be taken in to account Fitting position horizontal or vertical Ambient temperature limits - 40 C + 70 C Stocking temperature - 40 C + 85 C Humidity 0-100% rel. humidity of the air System of protection IP67 Temperature limits for the material - 40 C bis C (depending on model) Inlet and outlet acc. to ISO 5167 State of aggregate of the medium for liquid, gaseous and vapour phase media Viscosity max. approx. 30 mpas (higher viscosities upon request) Pressure loss remaining pressure loss is calculated for each orifice (typical max. 150mbar) Material Pressure sensor AISI316 (Hastelloy and others upon request) Process connection DN (bis DN 1000 upon request, other connections like ANSI can be specified) PN 40 (up to PN 325 upon request) Electrical connection Power supply V DC,2 wire system,½ NPT Display five digit LC display Certificates and approvals CE conformity Ex approvals in accordance with ATEX / FM / CENELEC / JIS / CSA / SAA