CERTIFIED. Ellipse. The. Flow Sensor. Your First Choice in Intelligent Flow Management...

Transcription

1 CERTIFIED The Ellipse Flow Sensor Your First Choice in Intelligent Flow Management...

2 Preso Ellipse * The Preso Ellipse offers the greatest accuracy of all flow sensors of its type. Its patented elliptical design with improved aerodynamic characteristics outperforms more traditional devices and overcomes loss of accuracy caused by fluid separation at the sensor body. The Preso Ellipse also offers energy savings, easy installation and long-term repeatability in a variety of applications. Tested and proven in the field, flow laboratories and insurance underwriter agencies, it has become the choice of professionals. Characteristics: Accuracy: + 3/4% of readings. NIST traceable testing at: CEESI, Alden, NRCC, and other labs. Repeatability: + 0.1% of readings. Turndown Ratio: 17:1 (K vs Re #). Airfoil characteristics offer very low permanent pressure loss and eliminate noise transmission. Typical: 3% of DP in a 12 (300 mm) line. The lowest in the industry. Reduced pumping costs. Easy to install. Maintenance free and self cleaning. Less affected by upstream piping. Hot tap models can be installed without system shutdown. Sizes: 2 to 72 and larger (50 mm to 1830 mm). *Patented

3 Conventional Flow Sensor Preso Ellipse Flow Sensor Unstable Vorticies Stable Attached Flow Designed to Work Better The Preso Ellipse flow meter is designed with a series of ports facing the upstream velocity pressures and flow sensing ports strategically located ahead of the trailing edge flow separation. As a result of this innovative design the Ellipse is capable of greater accuracy than a conventional sensor in measuring the actual DP signal. With the Ellipse, your measurement is absolutely precise and proportional to the actual flow rate. Proven Superior Extensive tests performed in recognized laboratories such as Alden Research, CEESI, NRC, etc., have demonstrated that the Preso Ellipse exhibits accuracies of +3/4%. The Ellipse also achieved an impressive turndown ratio of 17:1. These flow meters are even FM approved for use as fire pump flow metering systems. Incomparable Advantages When you look carefully at Preso quality and performance you can clearly see where your advantage lies with the Ellipse. Ellipse Outperforms Them All Compare and see for yourself! Round Shape Square Shape Typical Cross Section. A : 1/2 : 7/8 : 1-1/4 : 2-1/4 Ellipse Shape Low (static) pressure signal affected by separation. Turndown ratio of 4:1; vacuum effects. Variable intensity vortices generated behind (down stream),leading the probe to create signal amplifications, vibrations and acoustic problems. Accuracy of + 1.5% to 3%. High Drag coefficient inducing high pressure loss. High vortices area resulting from Large bluff body obstructing the flow stream. Turndown ratio of 10:1; vacuum effects. Highest drag coefficient of exiting pitot type probes (i. e. highest pressure loss). Claimed accuracy of + 1%. Vibration and acoustic problems. Flow boundary layers attached to the probe s surface, no separation effects on the low (static) pressure. Turndown ratio of 17:1; no vacuum effects. Very high repeatability. Accuracy of + 3/4%. Lowest drag coefficient (lowest pressure loss in the industry).

4 Preso... The Sensible AR - Regular (2 to 72 ) General purpose sensor used on air, gas and liquid. Pressure: 1,000 PSI (6,900 kpa) max. Temperature: F (200 0 C) max. Standard Components: T-Type head, 316-SS 1/4 or 1/2 FNPT connection. CS compression fitting with SS ferrule CS 3000 lb. weld fitting - ASTM A SS ID tag with wire 316-SS Ellipse Sensor Instrument valves (2 per sensor) - 1/4 or 1/2, CS Options: Double support, CS or 316-SS Weld fitting SS 150 lbs. or 3000 lbs. Mounting saddle for PVC or FRP pipes, CS or 316-SS Temperature port with RTD output Static pressure port with SS plug AF - Flanged (2 to 120 ) Flanged model used on air, gas and liquid. Pressure and temperature depend on flange ratings, ANSI B16.5 standards. Standard Components: T-Type head, 316-SS 1/4 or 1/2 FNPT connection. 150 lbs. 316-SS sensor flange CS gasket with SS spiral wound ring CS mounting flange, 150 lbs. ASTM A105 with nuts and bolts CS 3000 lb. weld fitting - ASTM A SS Ellipse Sensor Instrument valves (2 per sensor) - 1/2, CS 316-SS ID tag with wire Options: Double support, CS or 316-SS Spiral wound gasket, 316-SS 300 lbs., 600 lbs., and higher flange rating, CS or 316-SS ANSI B16.5 Temperature port with RTD output Static pressure port with SS plug AS - Steam (2 to 72 ) Used on steam application Pressure: 600 PSI (4,100 kpa) max. Temperature: F (250 0 C) max. Standard Components: T-Type head, 316-SS 1/2 FNPT connection. CS Compression fitting with SS ferule CS - OS & Y gate valves (1/2 NPT) CS 3000 lb. weld fitting, cross tees and plugs - ASTM A SS Ellipse Sensor 316-SS ID tag with wire Options: Double support, CS or 316-SS Compression fitting SS 150 lbs. or 3000 lbs. Temperature port with RTD output Static pressure port with SS plug 1/2 gate valves, OS & Y, 316-SS Note: Specify pipe

5 Choice in Flow Sensors AHR - Wet Tap (Low Pressure) (2 to 36 ) Wet-tap model used on liquid, air, and gas. For liquids without system shutdown. Ratings: i) Insertion/Removal: Pressure: 75 PSI (500 kpa) max. Temperature: F (50 0 C) max. ii) Operating Pressure: 150 PSI (1000 kpa) max. Temperature: F (100 0 C) max. Standard Components: T-Type head, 316-SS 1/4 or 1/2 FNPT connection CS compression Fitting with SS ferule 316-SS isolation ball valve, NPT CS reducer coupling CS 3000 lb. weld fitting - ASTM A105 CS nipples, schedule SS Ellipse Sensor 316-SS ID tag with wire Instrument valves (2 per sensor) - 1/4 or 1/2, CS Options: Double support, CS or 316-SS (only with system shutdown) Compression Fitting - All 316-SS Weld fitting SS 150 lbs. or 3000 lbs. 316-SS cage nipple AHL - Hot Tap (High Pressure) (2 to 72 ) Hot-tap model used on liquid, air, and gas without system shutdown Pressure: 800 PSI (5,500 kpa) max. Temperature: F (425 0 C) max. Standard Components: T-Type head, 316-SS 1/4 or 1/2 FNPT connection CS packing chamber with molythane or graphite packing gland 316-SS sensor flange, 150 lbs. CS packing chamber flange, 150 lbs. with SS cap 316-SS isolation ball valve, NPT CS threaded nuts and bolts CS nipples, schedule 40 CS 3000 lb. weld fitting - ASTM A SS Ellipse Sensor 316-SS ID tag with wire Instrument valves (2 per sensor) - 1/4 or 1/2, CS Options: Double support, CS or 316-SS (only with system shutdown) Weld fitting SS 150 lbs. or 3000 lbs. 316-SS rods, bolts and nuts 316-SS packing chamber and flange AHL - GD - Hot Tap (High Pressure) (2 to 72 ) Hot-tap model used on liquid, air, and gas without system shutdown Pressure: 800 PSI (5,500 kpa) max. Temperature: F (425 0 C) max. Standard Components: T-Type head, 316-SS 1/4 or 1/2 FNPT connection CS packing chamber with molythane or graphite packing gland 316-SS sensor flange, 150 lbs. CS packing chamber flange, 150 lbs. with SS cap 316-SS isolation ball valve, NPT CS threaded nuts and bolts CS nipples, schedule 40 CS 3000 lb. weld fitting - ASTM A SS Ellipse Sensor 316-SS ID tag with wire Instrument valves (2 per sensor) - 1/4 or 1/2, CS Options: Double support, CS or 316-SS (only with system shutdown) Weld fitting SS 150 lbs. or 3000 lbs. 316-SS rods, bolts and nuts 316-SS gear drive enclosure with handle 316-SS packing chamber and flange

6 Very High Accuracy with the Ellipse The Preso Ellipse offers NIST traceable accuracy for each application of compensated mass flow measurements and rate flow measurements. The wide 17:1 turndown range offers a linearized curve programmed into the multivariable transmitter or the Preso MFC computer. Characteristics: Accuracy % or better. NIST traceable calibration. Direct transmitter mount with multivariable technology. True static pressure measurement. Single point pipe entry for: DP, temperature and static pressure. No dampening software required.

7 Setup No.1: Ellipse - SMV Direct mass flow metering with pressure and temperature compensation. All features from one sensor with one 4-20 ma output wired to your DCS. A true insertion mass flowmeter which combines the Ellipse with the smart Multivariable Transmitter Technology: Only the Ellipse will provide true static pressure measurement rather than a calculated value. Only the Ellipse will provide the lowest permanent pressure loss due to its aerodynamic profile, Only SMV uses one sensor technology to accurately configure the 3 inputs. Setup No.2: Ellipse - STD Flow rate metering with 17 point linerization with one 4-20 ma output from the one sensor wired directly to your DCS. The Ellipse with an uncalibrated accuracy of +0.75% over a turndown (K vs. Re #) can improve accuracy by calibration of the Ellipse-STD assembly in a NIST traceable flowlaboratory. the 17 point linearization is programmed into the transmitter to provide +0.5% accuracy of reading Only the Ellipse offers +0.75% uncalibrated accuracy Only the Ellipse offers a 17:1 turndown (K vs. Re #). Only the Ellipse eliminates noise and dampening software. Setup No.3: Ellipse - P/T Direct mass flow metering with pressure and temperature compensation. All features from one sensor with one 4-20 ma output wired to your DCS. A true insertion mass flowmeter which combines the Ellipse with the smart Transmitter Technology: Only the Ellipse offers +0.75% uncalibrated accuracy Only the Ellipse offers a 17:1 turndown (K vs. Re #). Only the Ellipse will provide true static pressure from either the static port or a dedicated pressure port.

8 Air Flow Measuring Station This series utilizes the unique Ellipse design and is available in multi-point averaging insertion sensors and complete duct section flow stations with averaging arrays. The stations are available with or without flow straighteners and offer an ASHRAE design pitot-static array. AYR: Insertion style sensor available for circular, rectangular and oval ducts. SYR-RYR: ASHRAE averaging array for square or circular ducts. SYP-RYP: ASHRAE averaging array for square or circular ducts with built-in flow straighteners. Engineering Data Differential Pressure Calculation Basic Flow Equation P = ( C 1 ) 2 C = x K x D2 x Fa SCFM = ACFM x For square or rectangular ducts use equivalent diameter formula: D (equivalent) = SCFM SGS(T 0 F + 460) X P F.(psia) P F.(psia) 520 x T 0 F x W x H ( ) 0.5 π Design Features The PRESO ELLIPSE offers the greatest accuracy of all flow sensors of its type. Its patented elliptical design with improved aerodynamic characteristics outperforms more traditional devices, and overcomes loss of accuracy caused by fluid separation at the sensor body. Energy savings, easy installation and long-term repeatability makes it the first choice of professionals. For complete glossary of terms, K-Factors and Engineering Details, consult your local representative or the factory.

9 Preso FlowCalcs Program Preso Flow Calculation Program is made for Windows. It is a unique tool for sizing Preso products and choosing the right flow element. It allows the user to enter data pertinent to a customer s unique application, figure the differential pressure based on flow conditions and choose the proper flow meter. The program is a menu driven, pull down type. It covers all of Preso s primary elements including: Multi-Port Self Averaging Pitot Tubes (Annular Ellipse and round sensors) Venturis (Low Loss, Classical and Modified) Coin, Segmented-Wedge Meters (NPT, flanged or chemical seals) Air Flow Products (Air sensors, square, round or rectangular stations) Program Features Sizes Flow Element bores for Venturis (Low Loss, Classical or Modified). Performs Liquid, Steam and Gas (Volume or Mass) calculations. Calculations are done in English or Metric (SI) units. Calculations are done to Miller/Spinks, ASME, AGA and ISO Standards It calculates the maximum allowable DP, resonance and pressure losses for Multiport Self Averaging Pitot Tubes Ellipse or Round. Flow calculation reports are generated for each tag number with messages, warnings and recommendations. It has a unique feature in calculating Reynolds Numbers and DP at minimum, normal and maximum flow conditions. FlowCalcs Program While Preso have invested considerable time and money to create a high quality product, the user must assume the risk of using this product. In no event will Preso be liable for direct, indirect, special, incidental or consequential damages arising out of the use of or inability to use this software or documentation.

10 Engineering Data Differential Pressure Calculation The basic flow equations for the self-averaging pitot-tube or (Annular Flowmeter) are derived from the Bernoulli s Theorem (Energy Balance), and the Continuity Equation. The most common equations used by the industry, where different units are employed according to the flowing conditions of each type of fluid are as follows: (i) (ii) Liquid P = Gas / Air (iii) Steam GPM ( ) 2 C 1 ( ) 2 * SG F SCFM SG P = * S (T f + 460) C * SG 1 P f F P Note: SCFM = ACFM* f 520 * Tf C 1 = 128.8*K*D i2 *F a Lbs/Hr P = ( C 1 ) 2 * C 1 = *K*D i2 *F a Where P - Differential Pressure; Inches of water column at 60 0 F GPM - US Gallons per Minute SCFM - Standard Cubic Feet per Minute at 60 0 F and psia ACFM - Actual Cubic Feet per Minute Lbs/Hr - Pounds Mass per Hour C1 - Flow Constant K - Flow Coefficient Di - Inside Pipe Diameter, Inches Fa - Thermal Expansion of the Pipe; 1 up to F/ ( F) T f - Flowing Temperature, 0 F P f - Flowing Pressure, psia SG f - Specific Gravity at Flowing Conditions SG S - Specific Gravity at Standard Conditions (70 0 F, psia) ρ f - Flowing Density, lbs/ft 3 Resonance Calculations Resonance occurs when the natural frequency of the Ellipse sensor coincides with the natural frequency of the travelling fluid (Strouhal Frequency). Vibration checks should be done only on gas and steam applications. Vibration ratio R should be less than 0.8 or greater than 1.2 i.e. 0.8 < R < 1.2, R should be outside this region. R = Vmax V C Vmax = * ACFM (ID) 2 S Vc = L 2 S = for (7/8) probe S = for (1 1/4) probe S = for (2 1/4) probe C 1 = 359*K*D 2 i *F a * ρ f Vmax: Maximum fluid velocity, ft/sec Vc: Critical velocity, ft/sec S = probe factor L = probe length, see table W = pipe wall, inches ID = inside pipe diameter, inches L: Critical Probe Lenght, Inches Model AR AF AS AHR AHL Single Support ID+W Double Support ID+2W ~ ~ Water Test Calibration of an 8 single support probe Elliptical shape Model AR-800, 8 sch. 40 pipe D = Alden Research Laboratory Inc., April 1987 APL No /C549 Reynolds Number (based on pipe diameter) x 100,000 Flow Coefficient (K) + 3/4 % Air Test Calibration of a 3 and a 10 single support probe Elliptical shape 3 sch. 40 pipe, D = and 10 sch. 40 pipe D = Colorado Engineering Experiment Station Inc. 3 test date: May 16, 1988; serial no. 88PRI1 10 test date: Aug. 5, 1987; serial no. 87PRI1 Reynolds Number Rd x 100,000 Flow Coefficient + 3/4 % 10 sch /4 % 3 sch. 40 Flow Coefficient (K) Pipe Size K K K (Inches) Probe Size Probe Size Probe Size sch. 40* 7/8 1 1/4 2 1/ ~ ~ 2 1/ ~ ~ ~ ~ 3 1/ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Note - for different pipe schedule - consult factory. *14 & up - sch. STD.

11 Maximum Allowable DP (Inches of Water Column) Single Support Double Support Pipe Size Probe Size ProbeSize (Inches) 7/8 1 1/4 2 1/4 7/8 1 1/4 2 1/ ~ ~ 2380 ~ ~ 2 1/2 525 ~ ~ 1568 ~ ~ ~ ~ 1283 ~ ~ 3 1/2 283 ~ ~ 1117 ~ ~ ~ ~ 980 ~ ~ ~ ~ 757 ~ ~ ~ ~ 689 ~ ~ ~ 512 ~ ~ ~ ~ ~ 16 ~ ~ 450 ~ 18 ~ ~ 360 ~ 20 ~ ~ 295 ~ 24 ~ ~ ~ ~ ~ ~ ~ ~ 136 ~ ~ ~ ~ 105 ~ ~ ~ ~ 85 ~ ~ 350 Installation Requirements 1. Orientation: The Ellipse flow sensor can be installed vertically or horizontally. The probe should be mounted in the pipe 90 0 relative to the flow direction. 2. Straight pipe requirement: Accuracy is affected by the piping configurations due to the disturbances of the flow profile. A fully developed symmetrical flow is kept with the minimum upstream and downstream recommended lengths. Distances are Expressed in Nominal Pipe Diameters Pressure Loss Preso Ellipse sensor offers the lowest pressure loss of all types and shapes of its kind. Very low permanent pressure loss The low drag coefficient of the Preso Ellipse flow sensor allows the measurement to be taken with high accuracy, and hardly any pressure loss. Sensor Shape* CD Drag Coefficient Circular (Round) 1.2 Square 2.0 Diamond 1.6 Semitubular 2.3 Elliptical 0.32 Typical Specifications Furnish and install as shown on the drawings a flow element of the multi-ported, self averaging differential pressure type ELLIPSE as manufactured by Preso Meters Corporation. The flow element shall be of maximum two (2) piece construction, of an elliptical shape with two (2) 100% independent flow sensing chambers to prevent signal degradation and mixing or that require dampening hardware or software. The impact velocity sensing holes shall be located along the leading edge and the true static sensing holes shall be on the exterior probe side. The quantity and position shall be as determined by the manufacturer. The probe must not generate any vortices or vacuum effects that impinge on the static pressure measurement sensing area and have a drag coefficient of 0.32 or less. Each flow sensor shall be complete with instrument shut-off valves with provisions to accept a transmitter or direct indicating meter supplied by the same manufacturer as the primary element. An identification tag shall be supplied with specific flow station measurement information as required.

12 Preso COIN COIN Meter The COIN is a segmented wedge primary flow element specifically designed for the most difficult flow applications. It effectively measures any fluid, even those with very low Reynolds numbers. Characteristics: Accuracy ± 3% uncalibrated to ± 0.5% calibrated Bidirectional Sizes - 1/2 to 48 and larger Butt weld or Flanged ends NPT, Flanged, or Chem Tee instrument connections Available in many materials ISO 9001 certified design and fabrication Other Preso Products to Meet Your Needs... Preso manufactures a complete line of annular and venturi style flow meters to measure liquid, gas and steam flow applications. A full line of gages and flow computers to read in direct engineering units are also available. U.S.A.: 42 Gateway Drive, Plattsburgh, NY Tel.: (518) Fax: (518) Toll Free: (800) info@preso.com Canada: 140 Merizzi, St-Laurent, P.Q. H4T 1S4 Tel.: (514) Fax: (514) Ellipse